DCAMM STANDARD SPECIFICATIONS MASS. STATE PROJECT NUMBER REV 7.1 - CMR PROJECT NAME, LOCATION

SECTION 230001

HEATING, VENTILATING AND

(Trade Bid Required)

Trade Contractors on this CM at Risk project are required by law to provide Payment and Performance Bonds for the full value of their Trade Contracts, and Trade Contractors must include the full cost of the required Payment and Performance Bonds in the Bid price they submit in response to this RFB.

Bids will only be accepted from Trade Contractors pre-qualified by the Awarding Authority.

TABLE OF CONTENTS

PART 1 - GENERAL ...... 5 1.1 GENERAL PROVISIONS ...... 5 1.2 DESCRIPTION OF WORK ...... 6 1.3 SUBMITTALS ...... 8 1.4 DEFINITIONS...... 10 1.5 CONTRACT DOCUMENTS ...... 10 1.6 DISCREPANCIES IN DOCUMENTS ...... 11 1.7 MODIFICATIONS IN LAYOUT ...... 11 1.8 EXISTING CONDITIONS AND PREPARATORY WORK...... 12 1.9 CODES, STANDARDS, AUTHORITIES AND PERMITS ...... 12 1.10 GUARANTEE AND 24 HOUR SERVICE ...... 13 1.11 RECORD DRAWINGS...... 14 1.12 MANUALS, AND OPERATING INSTRUCTIONS, AND PROTECTION...... 14 1.13 COORDINATION DRAWINGS ...... 15 1.14 BIM MODEL...... 15 PART 2 - PRODUCTS ...... 18 2.1 DUCTWORK AND AIR DISTRIBUTION EQUIPMENT...... 18 2.2 ACOUSTICAL LINING...... 31 2.3 DUCT SILENCERS ...... 32 2.4 DUCT INSULATION ...... 33 2.5 DIFFUSER SILENCERS ...... 37 2.6 PIPING AND FITTINGS ...... 39 2.7 PREINSULATED PIPING...... 45 2.8 VALVES AND STRAINERS ...... 46 2.9 PIPE INSULATION ...... 49 2.10 PIPE HANGERS AND SUPPORTS...... 53 2.11 SLEEVES AND PENETRATIONS...... 54 2.12 ESCUTCHEONS AND DUCT COLLARS ...... 55 2.13 WATER SPECIALTIES...... 55 2.14 EQUIPMENT INSULATION ...... 56 2.15 MOTORS, STARTERS AND WIRING ...... 57 2.16 VARIABLE FREQUENCY DRIVES...... 58 2.17 CENTRIFUGAL PUMPS...... 58 2.18 DUPLEX SET ...... 59 2.19 DUPLEX FEED PUMP UNIT...... 60 2.20 BOILER STEEL FIRE TUBE...... 61

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2.21 BOILER - CAST IRON SECTIONAL...... 64 2.22 BOILER - CAST IRON MODULAR...... 69 2.23 BREECHING AND STACK (FIELD FABRICATED)...... 71 2.24 BREECHING AND STACK (PREFABRICATED)...... 72 2.25 CHEMICAL TREATMENT - WATER SYSTEMS...... 72 2.26 CHEMICAL TREATMENT - STEAM SYSTEMS ...... 74 2.27 CHEMICAL TREATMENT - DIRECT INJECTED STEAM HUMIDIFICATION SYSTEMS 75 2.28 PRESSURE GAUGES, THERMOMETERS AND TEST PLUGS...... 75 2.29 FLOW ELEMENTS ...... 76 2.30 STEAM METER ...... 76 2.31 BTU METERS...... 77 2.32 STEAM PRESSURE REDUCING VALVES...... 78 2.33 STEAM TRAPS ...... 78 2.34 FILTERS MEDIUM EFFICIENCY, THROW AWAY TYPE...... 78 2.35 CHARCOAL FILTERS FOR RADIOACTIVE APPLICATIONS ...... 79 2.36 HIGH EFFICIENCY PARTICULATE AIR (HEPA) FILTER ASSEMBLIES ...... 79 2.37 BAG FILTERS FOR MEDICAL AND OTHER STERILE FACILITIES...... 79 2.38 HOOD EXHAUST AND MAKE UP AIR SYSTEM ...... 81 2.39 KITCHEN ROOFTOP AIR HANDLING HEAT RECOVERY UNIT...... 81 2.40 KITCHEN EXHAUST HOOD...... 81 2.41 STEAM WITH PNEUMATIC CONTROL...... 82 2.42 ELECTRIC STEAM ...... 83 2.43 HUMIDIFIERS (SELF CONTAINED) ...... 84 2.44 COIL UNITS ...... 84 2.45 ROOFTOP AIR HANDLING UNITS...... 84 2.46 PACKAGED, AIR COOLED, DX ROOFTOP UNIT ...... 90 2.47 BUILT UP ...... 94 2.48 CENTRAL STATION AIR HANDLING UNITS ...... 103 2.49 VARIABLE VOLUME TERMINAL UNITS (NON-FAN POWERED)...... 108 2.50 VARIABLE VOLUME TERMINAL UNITS (FAN POWERED)...... 109 2.51 UNIT VENTILATORS ...... 110 2.52 HOT WATER (STEAM) CABINET HEATERS...... 112 2.53 ELECTRIC CABINET HEATERS ...... 113 2.54 (HOT WATER) (STEAM) UNIT HEATERS...... 113 2.55 ELECTRIC UNIT HEATERS...... 114 2.56 GAS UNIT HEATERS...... 114 2.57 FIN TUBE CONVECTORS...... 114 2.58 FIN TUBE RADIATION ...... 115 2.59 COMMERCIAL FIN TUBE BARE ELEMENT ...... 115 2.60 ELECTRIC TRACE ...... 116 2.61 EMERGENCY GENERATOR SPECIALTIES...... 116 2.62 STEAM HEATING COILS...... 117 2.63 HOT WATER COILS...... 117 2.64 () (GLYCOL/WATER) COILS...... 117 2.65 COILS ...... 117 2.66 SHELL AND TUBE HEAT EXCHANGERS ...... 118 2.67 PLATE AND FRAME HEAT EXCHANGERS ...... 119 2.68 FUEL OIL TRANSFER PUMP SYSTEM...... 119 2.69 FUEL OIL SYSTEM, STEEL TANK...... 120 2.70 OPEN CELL COOLING TOWERS...... 122

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2.71 CLOSED CELL COOLING TOWERS...... 124 2.72 AIR COOLED WATER ...... 126 2.73 CENTRIFUGAL CHILLERS...... 128 2.74 RECIPROCATING WATER ...... 133 2.75 AIR COOLED CONDENSER ...... 134 2.76 SPLIT SYSTEM DIRECT EXPANSION AIR CONDITIONING...... 135 2.77 COMPUTER ROOM AIR CONDITIONING UNIT, CHILLED WATER...... 136 2.78 COMPUTER ROOM AIR CONDITIONING UNIT (DX)...... 138 2.79 COMPUTER AIR CONDITIONING UNIT (GLYCOL) ...... 140 2.80 SELF CONTAINED AIR CONDITIONING UNITS...... 142 2.81 PACKAGED TERMINAL AIR CONDITIONING UNITS ...... 143 2.82 INLINE CENTRIFUGAL EXHAUSTERS AND TRANSFER FANS ...... 143 2.83 EXHAUST FANS CONFERENCE ROOM TYPE ...... 143 2.84 BELTED VENT SET ...... 144 2.85 DUCT (VANE) AXIAL FANS ...... 144 2.86 PROPELLER FANS...... 145 2.87 CENTRIFUGAL FANS ...... 145 2.88 CENTRIFUGAL FANS FOR ROOF EXHAUST ...... 146 2.89 INLINE CENTRIFUGAL FANS ...... 147 2.90 RECIRCULATING ROOF VENTILATOR ...... 147 2.91 ROOF MOUNTED FRESH AIR HOOD...... 148 2.92 ROOF VENTS...... 148 2.93 COMBUSTIBLE GAS DETECTION AND ALARM SYSTEM...... 149 2.94 MONOXIDE (CO) DETECTION AND CONTROL...... 149 2.95 PACKAGED ...... 149 2.96 CONSOLE HEAT PUMP ...... 150 2.97 CEILING MOUNTED HEAT PUMP...... 151 2.98 VIBRATION ISOLATION (NON-SEISMIC)...... 152 2.99 VIBRATION ISOLATION (SEISMIC)...... 159 2.100 MONITORING AND DETECTION (MULTIPLE POINT)...... 170 2.101 REFRIGERANT MONITORING AND DETECTION (SINGLE POINT) ...... 173 2.102 AUTOMATIC TEMPERATURE CONTROL SYSTEM ELECTRIC/ELECTRONIC - NOT DIRECT DIGITAL...... 175 2.103 AUTOMATIC TEMPERATURE CONTROL SYSTEM, PNEUMATIC ...... 180 2.104 AUTOMATIC TEMPERATURE CONTROLS (DIRECT DIGITAL CONTROL) ...... 186 2.105 SEQUENCE OF OPERATION...... 210 2.106 ACCESS DOORS...... 211 PART 3 - EXECUTION ...... 212 3.1 COMMISSIONING OF EQUIPMENT AND SYSTEMS...... 212 3.2 SPECIAL RESPONSIBILITIES ...... 213 3.3 MATERIALS AND WORKMANSHIP...... 216 3.4 CONTINUITY OF SERVICES...... 216 3.5 TAGS ...... 216 3.6 PIPE AND DUCT IDENTIFICATION...... 217 3.7 WELDING...... 218 3.8 PENETRATIONS AND SLEEVES...... 218 3.9 ANCHORS AND INSERTS ...... 220 3.10 INSTALLATION OF EQUIPMENT ...... 220 3.11 CHILLER INSTALLATION...... 220 3.12 BOILER ERECTION AND CLEANING HOT WATER...... 221 3.13 BURNER LIGHTOFF, ADJUSTMENT AND PRESSURE TEST...... 222

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3.14 PAINTING...... 222 3.15 EXPANSION PROVISIONS ...... 223 3.16 CLEANING ...... 223 3.17 STARTUP, TESTING AND BALANCING...... 224 3.18 CONTAINMENT ROOM, ANIMAL ROOM SEALING REQUIREMENTS ...... 238

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SECTION 230001

HEATING, VENTILATING AND AIR CONDITIONING

PART 1 - GENERAL

1.1 GENERAL PROVISIONS

A. Attention is directed to the CONTRACT AND GENERAL CONDITIONS and all Sections within DIVISION 01 - GENERAL REQUIREMENTS, which are hereby made a part of this Section of the Specifications.

B. Time, Manner and Requirements for Submitting Trade Bids:

1. Trade bids for work under this Section shall be for the complete work and shall be filed in a sealed envelope with the Division of Capital Asset Management and Maintenance at a time and place as stipulated in the "NOTICE TO CONTRACTORS".

The following should appear on the upper left hand corner of the envelope:

NAME OF TRADE BIDDER: (Insert name of trade bidder)

MASS. STATE PROJECT: ((Insert project number from top of page))

TRADE BID FOR SECTION: 230001 – HEATING, VENTILATING AND AIR CONDITIONING

2. Each trade bid submitted for work under this Section shall be on forms furnished by the Division of Capital Asset Management and Maintenance as required by Section 8 of Chapter 149A of the General Laws, as amended. Trade bid forms may be obtained at the office of the Division of Capital Asset Management and Maintenance, or may be obtained by written or telephone request; telephone (617) 727-4003. 3. Trade bids filed with the Division of Capital Asset Management and Maintenance shall be accompanied by BID BOND or CASH or CERTIFIED CHECK or TREASURER'S CHECK or CASHIER'S CHECK issued by a responsible bank or trust company payable to the Commonwealth of Massachusetts in the amount of five percent of the trade bid. A trade bid accompanied by any other form of bid deposit than those specified will be rejected.

C. Trade Sub-Bid Requirements:

1. For the classes of work listed below, the Trade Contractor’s attention is directed to Massachusetts G.L. 149A Section 8(g)(6) and the Trade Contractor’s Bid Form part E. as amended, which provides in part as follows: 2. The names of all persons, firms and corporations furnishing to the undersigned labor or labor and materials for the classes or part thereof of work for which the provisions of the section of the Specifications for this sub-trade require listing in this paragraph, including

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the undersigned if customarily furnished by persons on his own payroll, and in the absence of a customary provision in the Specifications, the name of each class of work or part thereof and the bid price for such class of work or part thereof are:

CLASSES OF WORK REFERENCE PARAGRAPH

Ductwork Insulation Automatic Temperature Controls Startup, Testing and Balancing

D. Reference Drawings: The Work of this Trade Sub-Bid is shown on the following Contract Drawing: ((When issuing for bidding, insert list of Drawings applicable to the work of this section))

1.2 DESCRIPTION OF WORK

A. Work Included: Provide labor, materials and equipment necessary to complete the work of this Section, including but not limited to the following:

1. Tie ins to existing steam, condensate, pump discharge and fuel oil piping. 2. Relocation of existing systems which interfere with new construction. 3. Coordinate maintenance of existing services during construction with DCAMM’s Project Manager. 4. Special coordination of chases and plenums as specified in Part 3 article, Special Responsibilities. 5. Sleeves, inserts and hangers. 6. Flexible connections for pumps and other vibrating and rotating equipment. 7. Equipment bases and supports. 8. Vibration isolators and inertia blocks. 9. Motors. 10. Hot water , trim and controls. 11. Boiler pipe and breeching. 12. Complete hot water system including pumps, expansion tanks, piping, valves, fittings and other hardware. 13. Fuel oil system including underground tanks, pumps, piping, valves, fittings and other hardware. 14. Centrifugal water chillers. 15. Complete chilled water system including pumps, expansion tanks, piping, valves, fittings and other hardware. 16. Cooling towers. 17. Complete condenser water system including pumps, piping, valves, fittings and other hardware. 18. Expansion joints. 19. Pressure gauges and thermometers. 20. Fin tube radiation. 21. Steam, condensate and pump discharge system including condensate pumps. 22. Humidifiers. 23. Water treatment equipment and chemicals, and testing. 24. Sheet metal work.

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25. Complete air distribution system including low and medium pressure ductwork, diffusers, registers, , splitters, dampers, and similar items. 26. Insulation for duct, piping, equipment and tanks. 27. Constant volume and air handling units, including fans, coils, filters, motors and mixing boxes. 28. Variable air volume terminal boxes. 29. Duct mounted sound attenuators. 30. Exhaust and ventilating air fans. 31. Rooftop supply and exhaust fans. 32. Rooftop heating and ventilating units and related equipment. 33. Condensate piping from chilled water coil drain pans. 34. Roof gravity reliefs. 35. Hot water unit heaters. 36. Unit ventilators. 37. Computer room air conditioning units. 38. Electric cabinet heaters. 39. Prime painting. 40. Pipe, duct, valve and equipment identification. 41. Instruction manuals and startup instructions. 42. Testing and balancing. 43. Cleaning. 44. Refrigerant using HCFC refrigerant R134a preferred; equipment containing refrigerant other than R134a shall be supplied with a HCFC refrigerant suitable for the operational requirements of the equipment. 45. Automatic temperature controls, variable air volume controls and other controls. 46. Certified seismic restraints to meet the Commonwealth of Massachusetts Building Code applicable at the time the building permit is issued 47. Core drilling for the Work of this Section. 48. Coordination drawings and record drawings and similar requirements. 49. BIM modeling as specified in this Section and in Section 013129 - BIM COORDINATION. 50. Hoisting equipment for the Work of this Section. 51. Coordination with Construction Manager for use of staging, planking and scaffolding, interior and exterior, which is the responsibility of the Construction Manager as specified in Section 015000 - TEMPORARY FACILITIES AND CONTROLS.

B. Alternates: Not Applicable.

C. Items to Be Installed Only: Install the following items as furnished by the designated Sections:

1. Section 260001 – ELECTRICAL WORK a. Duct mounted smoke detectors. b. Emergency generator access.

D. Items to Be Furnished Only: Furnish the following items for installation by the designated Sections:

1. Section 033000 – CAST-IN-PLACE CONCRETE: a. Pipe and duct sleeves for placement into formwork. 2. Section 042000 – UNIT MASONRY: a. Access doors in masonry openings.

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b. Pipe and duct sleeves for placement into masonry openings. 3. Section 070002 –ROOFING AND FLASHING: a. Roof curbs. 4. Section 092400 – PORTLAND CEMENT PLASTERING a. Access doors in plaster openings. b. Pipe and duct sleeves for placement into plaster openings. 5. Section 092116 – GYPSUM BOARD ASSEMBLIES: a. Access doors in gypsum board openings. b. Pipe and duct sleeves for placement into gypsum board openings. 6. Section 092117 – GYPSUM BOARD SHAFT-WALL ASSEMBLIES: a. Access doors in gypsum board shaft-wall openings. b. Pipe and duct sleeves for placement into gypsum board shaft-wall openings. 7. Section 093000 - TILING: a. Access doors in tile. 8. Section 095113 – ACOUSTICAL PANEL CEILINGS: a. Access doors in acoustical tile. 9. Section 260001 – ELECTRICAL WORK: a. Magnetic starters. b. DDC control panels.

E. Related Work: The following items are not included in this Section and will be performed under the designated Sections:

1. Section 033000 - CAST-IN-PLACE CONCRETE for cutting and patching of concrete walls and for concrete equipment pads, manhole and thrust block requirements. 2. Section 051200 - STRUCTURAL STEEL FRAMING for structural supports necessary to distribute loading from equipment to roof or floor. 3. Section 070002 –ROOFING AND FLASHING for flashing of roof mounted equipment and roofing penetrations. 4. Section 078413 – PENETRATION FIRESTOPPING for coordination of floor and wall penetrations with firestopping contractor. 5. Section 092116 – GYPSUM BOARD ASSEMBLIES for coordination with gypsum ceilings and walls. 6. Section 095113 – ACOUSTICAL PANEL CEILINGS for coordination with acoustical ceilings. 7. Section 220001 – PLUMBING for cold water make-up to mechanical equipment as indicated on the Drawings. 8. Section 260001 - ELECTRICAL WORK for electrical power to mechanical equipment as indicated on the Drawings. 9. Section 312000 – EARTH MOVING for excavation and backfilling

F. Perform work and provide material and equipment as shown on Drawings and as specified or indicated in this Section of the Specifications. Completely coordinate work of this Section with work of other trades and provide a complete and fully functional installation.

G. Give notices, file plans, obtain permits and licenses, pay fees and back charges, and obtain necessary approvals from authorities that have jurisdiction as required to perform work in accordance with all legal requirements and with Specifications, Drawings, Addenda and Change Orders, all of which are part of Contract Documents.

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1.3 SUBMITTALS

A. Comply with requirements specified in Section 013300 – SUBMITTAL REQUIREMENTS.

B. Shop Drawing: Submittals shall include but not be limited to:

1. Pumps. 2. Air cooled chillers. 3. Fittings, valves and strainers. 4. Expansion tanks and water and fuel oil system special fittings. 5. Diffusers, registers, grilles, splitters, dampers and accessories. 6. Computer room units (chilled water). 7. Ventilating and exhaust fans. 8. Cooling coils. 9. Filters. 10. Sound attenuators. 11. Electric cabinet heaters. 12. Variable air volume boxes. 13. Automatic controls. 14. Insulation and acoustical lining. 15. Vibration isolators. 16. Pressure gauges and thermometers. 17. Motor starters. 18. Water treatment equipment. 19. Pipe, pipe hangers, sleeves and inserts. 20. Humidifiers. 21. Equipment bases and supports. 22. Unit heaters. 23. Identification for pipe, duct, valves and equipment. 24. Complete ductwork shop drawings, construction details and duct construction standards. 25. Roof gravity reliefs. 26. Motors. 27. Fuel oil pumps. 28. Access panels. 29. Color selection charts and samples for equipment and systems in finished areas.

C. Hanger Pull-Out Testing Submittals and Requirements: Hangers and supports will be tested for pull-out by the Independent Testing Agency designated by the DCAMM Project Manager. Comply with the requirements of Section 014325 – TESTING AGENCY SERVICES and the following:

1. Trade Contractor’s Documentation Prior to Testing: a. Submit manufacturer’s name and model number for each type of hanger and support proposed for use, and technical data including type, load capacity, test reports, methods for installation, and use limitations. b. Submit a schedule for each type of hanger and support indicating where units for testing will be installed, including substrate, and materials to be supported. c. Submit a letter from Trade Contractor indicating supports have been installed in accordance with manufacturer’s recommendations and project requirements, and are ready for testing.

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2. Independent Testing Agency’s Documentation Prior to Testing for Trade Contractor’s Information: a. Submit the methods and type of equipment which will be used to test hangers and supports. b. Submit loads which will be applied, and criteria for acceptance or failure of hangers and supports. 3. Quantity to Be Installed by Trade Contractor for Testing: Two of each size of each type of hanger or support. 4. Testing Results: The Independent Testing Agency will submit reports indicating test results. a. Units which did not deform or fail during testing may remain in place. b. Units which failed during testing shall be replaced and testing repeated until satisfactory results are obtained. c. Cost of repeat testing will be at the expense of the Trade Contractor. d. Contractor shall repair damaged substrates, if any.

1.4 DEFINITIONS

A. As used in this Section, "provide" means "furnish and install" and "HVAC" means "Heating, Ventilating and Air Conditioning" and "POS" means "Provided Under Other Sections". "Furnish" means "to purchase and deliver to the project site complete with every necessary appurtenance and support," and "Install" means "to unload at the delivery point at the site and perform every operation necessary to establish secure mounting and correct operation at the proper location in the project."

1.5 CONTRACT DOCUMENTS

A. Listing of Drawings does not limit responsibility of determining full extent of work required by Contract Documents. Refer to Architectural, HVAC, Electrical, Structural, and other Drawings and other Sections that indicate types of construction in which work shall be installed and work of other trades with which work of this Section must be coordinated.

B. Except where modified by a specific notation to the contrary, it shall be understood that the indication and/or description of any item, in the Drawings or specifications or both, carries with it the instruction to furnish and install the item, regardless of whether or not this instruction is explicitly stated as part of the indication or description.

C. Items referred to in singular number in Contract Documents shall be provided in quantities necessary to complete work.

D. Drawings are diagrammatic. They are not intended to be absolutely precise; they are not intended to specify or to show every offset, fitting, and component. The purpose of the Drawings is to indicate a systems concept, the main components of the systems, and the approximate geometrical relationships. Based on the systems concept, the main components, and the approximate geometrical relationships, the contractor shall provide all other components and materials necessary to make the systems fully complete and operational.

E. Information and components shown on riser diagrams but not shown on plans, and vice versa, shall apply or be provided as if expressly required on both.

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F. Data that may be furnished electronically by the Designer (on computer tape, diskette, or otherwise) is diagrammatic. Such electronically furnished information is subject to the same limitation of precision as heretofore described. If furnished, such data is for convenience and generalized reference, and shall not substitute for Designer ’s sealed or stamped construction documents.

1.6 DISCREPANCIES IN DOCUMENTS

A. Where Drawings or Specifications conflict or are unclear, advise Designer in writing before Award of Contract. Otherwise, Designer ’s interpretation of Contract Documents shall be final, and no additional compensation shall be permitted due to discrepancies or unclarities thus resolved.

B. Where Drawings or Specifications do not coincide with manufacturers' recommendations, or with applicable codes and standards, alert Designer in writing before installation. Otherwise, make changes in installed work as Designer requires within Contract Price.

C. If the required material, installation, or work can be interpreted differently from drawing to drawing, or between drawings and specs, this contractor shall provide that material, installation, or work which is of the higher standard.

D. It is the intent of these contract documents to have the contractor provide systems and components that are fully complete and operational and fully suitable for the intended use. There may be situations in the documents where insufficient information exists to precisely describe a certain component or subsystem, or the routing of a component. In cases such as this, where the contractor has failed to notify the Designer of the situation in accordance with Paragraph (A) above, the contractor shall provide the specific component or subsystem with all parts necessary for the intended use, fully complete and operational, and installed in workmanlike manner either concealed or exposed per the design intent.

E. In cases covered by Paragraph (D) above, where the contractor believes he needs engineering guidance, he shall submit a sketch identifying his proposed solution and the Designer shall review, note if necessary, and approve the sketch.

1.7 MODIFICATIONS IN LAYOUT

A. HVAC, Plumbing, Fire Protection, and Electrical Drawings are diagrammatic. They indicate general arrangements of mechanical and electrical systems and other work. They do not show all offsets required for coordination nor do they show the exact routings and locations needed to coordinate with structure and other trades and to meet architectural requirements.

B. In all spaces, prior to installation of visible material and equipment, including access panels, review Architectural Drawings for exact locations and where not definitely indicated, request information from Designer.

C. Check Contract Drawings as well as Shop Drawings of all subcontractors to verify and coordinate spaces in which work of this Section will be installed.

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D. Maintain maximum headroom at all locations. All piping, duct, conduit, and associated components to be as tight to underside of structure as possible.

E. Make reasonable modifications in layout and components needed to prevent conflict with work of other trades and to coordinate according to Paragraphs A, B, C, D above. Systems shall be run in a rectilinear fashion.

F. Where conflicts or potential conflicts exist and engineering guidance is desired, submit sketch of proposed resolution to Designer for review and approval.

1.8 EXISTING CONDITIONS AND PREPARATORY WORK

A. Before starting work in a particular area of the project, visit site and examine conditions under which work must be performed including preparatory work done under other Sections or Contracts. Report conditions that might affect work adversely in writing through Contractor to Designer. Do not proceed with work until defects have been corrected and conditions are satisfactory. Commencement of work shall be construed as complete acceptance of existing conditions and preparatory work.

1.9 CODES, STANDARDS, AUTHORITIES AND PERMITS

A. Perform work strictly as required by rules, regulations, standards, codes, ordinances, and laws of local, state, and Federal governments, and other authorities that have legal jurisdiction over the site. Materials and equipment shall be manufactured, installed and tested as specified in latest editions of applicable publications, standards, rulings and determinations of:

1. Local and state building, plumbing, mechanical, electrical, fire and health department codes. 2. American Gas Association (AGA). 3. National Fire Protection Association (NFPA). 4. American Insurance Association (A.I.A.) (formerly National Board of Fire Underwriters). 5. Occupational Safety and Health Act (OSHA). 6. Underwriters' Laboratories (UL).

B. Material and equipment shall be listed by Underwriters' Laboratories (UL), and approved by ASME and AGA for intended service.

C. Most recent editions of applicable specifications and publications of the following organizations form part of Contract Documents:

1. American National Standards Institute (ANSI). 2. American Society of Mechanical Engineers (ASME). 3. National Electric Manufacturers Association (NEMA). 4. American Society for Testing and Materials (ASTM). 5. American Water Works Association (AWWA). 6. American Society for Heating, Refrigerating and Air Conditioning Engineers (ASHRAE). 7. Air Moving and Conditioning Association (AMCA).

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8. Sheet Metal and Air Conditioning Contractors National Association (SMACNA). 9. American Diffuser Council (ADC). 10. Air Conditioning and Institute (ARI). 11. Manufacturers Association (TIMA). 12. Institute of Electrical and Electronics Engineers (IEEE). 13. Insulated Cable Engineers Association (ICEA). 14. Certified Ballast Manufacturers (CMB). 15. Illuminating Engineering Society (IES).

D. Special attention is directed to requirements of NFPA 45, Laboratories Using Chemicals.

1.10 GUARANTEE AND 24 HOUR SERVICE

A. Guarantee Work of this Section in writing for one year following the date of Substantial Completion. If the equipment is used for ventilation, temporary heat, etc. prior to Substantial Completion, the bid price shall include an extended period of warranty covering the one year of occupancy, starting from the initial date of Substantial Completion. The guarantee shall repair or replace defective materials, equipment, workmanship and installation that develop within this period, promptly and to Designer ’s satisfaction and correct damage caused in making necessary repairs and replacements under guarantee within Contract Price.

B. In addition to guarantee requirements of Division 01 and of Subparagraph A above, obtain written equipment and material warranties offered in manufacturer's published data without exclusion or limitation, in DCAMM’s name.

C. Replace material and equipment that require excessive service during guarantee period as defined and as directed by Designer.

D. Provide 24 hour service beginning on the date the project is first occupied for public use by the User Agency, whether or not fully occupied, and lasting until the termination of the guarantee period. Service shall be at no cost to DCAMM. Service can be provided by this contractor or a separate service organization. Choice of service organization shall be subject to Designer and DCAMM approval. Submit name and a phone number that will be answered on a 24 hour basis each day of the week, for the duration of the service.

E. Submit copies of equipment and material warranties to Designer before final payment.

F. At end of guarantee period, transfer manufacturers' equipment and material warranties still in force to DCAMM.

G. This Paragraph shall not be interpreted to limit DCAMM’s rights under applicable codes and laws and under this Contract.

H. Part 2 Paragraphs of this Specification may specify warranty requirements that exceed those of this Paragraph.

I. Use of systems provided under this Section for temporary services and facilities shall not constitute Final Acceptance of work nor beneficial use, and shall not institute guarantee period.

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J. Provide manufacturer's engineering and technical staff at site to analyze and rectify problems that develop during guarantee period immediately. If problems cannot be rectified immediately to The DCAMM Project Manager’s satisfaction, advise Designer in writing, describe efforts to rectify situation, and provide analysis of cause of problem. Designer will suggest course of action.

1.11 RECORD DRAWINGS

A. Comply with requirements specified in Section 017700 – CONTRACT CLOSEOUT.

B. All "main air" pneumatic control piping routing locations must be shown on the record Drawings.

C. Drawings shall show record condition of details, sections, riser diagrams, control changes and corrections to schedules. Schedules shall show actual manufacturer and make and model numbers of final equipment installation.

1.12 MANUALS, AND OPERATING INSTRUCTIONS, AND PROTECTION

A. Obtain at time of purchase of equipment, three copies of operation, lubrication and maintenance manuals for all items. Assemble literature in coordinated manuals with additional information describing combined operation of field assembled units, including as built wiring diagrams. Manual shall contain names and addresses of manufacturers and local representatives who stock or furnish repair parts for items or equipment. Divide manuals into three sections or books as follows:

1. Directions for and sequence of operation of each item of HVAC system, e.g. air handling units and boilers. Sequence shall list valves, switches, and other devices used to start, stop and control system. Detail procedure to be followed in case of malfunctions. Include detailed approved flow diagrams of temperature control, heating, condensate, chilled water, condenser water, etc. as appropriate for systems provided. Include approved valve directory showing each valve number, location of each valve, and equipment or fixture controlled by valve. 2. Detailed maintenance and trouble shooting manuals containing data furnished by manufacturer for complete maintenance. Include copy of balancing report. 3. Lubrication instructions detailing type of lubricant, amount, and intervals recommended by manufacturer for each item of equipment. Include additional instructions necessary for implementation of first class lubrication program. Include approved summary of lubrication instructions in chart form, where appropriate.

B. Furnish three copies of manuals to Designer for approval and distribution. Deliver manuals no less than 30 days prior to acceptance of equipment to permit User Agency’s personnel to become familiar with equipment and operation prior to acceptance.

C. Provide framed and glazed charts as follows: mount as directed by Designer.

1. Flow diagrams from first part of manual as described above. 2. Valve directory. 3. Lubrication chart from third part of manual.

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D. Operating instructions: Upon completion of installation or when DCAMM accepts portions of building and equipment for operational use, instruct User Agency’s operating personnel in any or all parts of various systems. Instructions shall be performed by factory trained personnel. DCAMM shall determine which systems require additional instructions. Duration of instructions shall take equipment through complete cycle of operation (at least five working days). Make adjustments under operating conditions.

E. Each contractor shall be responsible for his work and equipment until finally inspected, tested, and accepted. Carefully store materials and equipment which are not immediately installed after delivery to site. Close open ends of work with temporary covers or plug during construction to prevent entry of obstructing material.

F. Each separate contractor shall protect the work and material of other trades that might be damaged by his work or workmen and make good all damage thus caused.

1.13 COORDINATION DRAWINGS

A. Refer to Section 013100 – PROJECT MANAGEMENT AND COORDINATION for coordination drawing requirements.

B. Coordination Drawings include but are not necessarily limited to:

1. Structure. 2. Partition/room layout. 3. Ceiling tile and grid. 4. Light fixtures. 5. Access panels. 6. Sheet metal, heating coils, boxes, grilles, diffusers, etc. 7. All heating piping and valves. 8. Smoke and fire dampers. 9. Soil, waste and vent piping. 10. Major water and medical gases. 11. Roof drain piping. 12. Major electrical conduit runs, panelboards, feeder conduit and racks of branch conduit. 13. Above ceiling miscellaneous metal. 14. Sprinkler piping and heads. 15. Heat tracing of piping.

1.14 BIM MODEL

A. The Trade Contractor for the work of this Section shall provide BIM coordination services to support the Construction Manager in their BIM model production and coordination work as required for this project in Specification Section 013129 – BIM COORDINATION.

B. The Trade Contractor shall include in their scope and in the cost of their work the service of a BIM Production Modeler. The Trade Contractor shall, within seven (7) business days of being identified as the approved The Trade Contractor, provide to the Construction Manager and DCAMM Project Manager the name, qualifications and experience history of the proposed BIM Production Modeler. The BIM Production Modeler shall have the experience on projects of

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similar size, scope and complexity. DCAMM has the right to approve or disapprove any proposed BIM Production Modeler. If the BIM Production Modeler proposed is not approved by DCAMM, then the Trade Contractor shall identify another firm acceptable to DCAMM without any change in cost.

C. Provide a 3-Dimensional system model of the contract documents in a computer program that is based on the concept/principles of Building Information Modeling (BIM) and Virtual Design and Construction (VDC).

1. Base Model: a. The Designer’s base 3-D architectural and structural model will be provided by the Construction Manager in AutoCAD Architecture (*.dwf) the base model is to be used as the background for all system models. b. The base model point of origin (x, y, z) will be determined by the CM VDC. 2. System Model: a. Use the same origin (x, y, z) and orientation as the base model. b. Elevate system model so that when merged with the base model the system model is at the correct height above the finish floor elevation. c. Model to be broken into layers, for example: floor by floor, phase by phase, and as applicable. d. Use color and/or textures per standards to be provided by the CM VDC. e. Provide system models in native application (*.dwg) formats. f. System model must be a solid surface model (not wire frame), when viewed in NavisWorks. g. System models must accurately represent all elements in the Contract Documents and at the same level of detail and precision required for shop drawings. Remove any “scratch” work including backgrounds of other models before providing system model to the Construction Manager. h. Prepare the system models using software that allow 2-D drawing sheets to be extracted from the model so that production of these sheets do not require a special or duplicated CAD effort. The system models and any drawings produced from the coordination process will be treated as shop drawings and are to be used for coordination purposes only. All Trade Contractors are still responsible to verify that their systems are being installed per the contract documents, RFI’s, changes, and as applicable. i. Grant DCAMM (the Owner) a perpetual, fully paid license to use the models produced by this agreement. This shall be done without acknowledgement of the Modeler and in any manner deemed desirable by DCAMM in connection with its business. j. The CADD files, AutoCAD architecture files, TIF files, shop drawings, RFI’s, as- built drawings, and as applicable. (collectively “Project Information”), provided to the Trade Contractor are the Property of DCAMM (the Owner). The Trade Contractor agrees it will keep all project information in strict confidence and will not use it on any other project or for any other reason. The Trade Contractor further agrees it will not disseminate the project Information to anyone except with a need to know, and will return all project Information to DCAMM when services requiring the Project Information are complete.

D. Coordination Process Steps:

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1. Step 1: Trade Contractor to identify conflicts between their system model and the base model and resolve with the Construction Manager and design team prior to MEP coordination meeting. 2. Step 2: Trade Contractor to identify any required penetrations in architectural and structural elements for their work prior to MEP coordination meeting. 3. Step 3: Trade Contractor to provide system model to the Construction Manager. The Construction Manager will integrate system model with base model in NavisWorks to create a “coordination model” 4. Step 4: Trade Contractor and the Construction Manager to meet, review, and resolve clashes/conflicts within the coordination model. 5. Step 5: Trade Contractor make changes to their system model per resolutions from MEP coordination meeting. 6. Step 6: Repeat steps 3 through 5 until all clashes/conflicts have been resolved in the coordination model.

E. Equipment Models: All equipment specified and intended to be used for installation shall be represented in the coordination model as a fully functional 3D component with the following characteristics:

1. Create models in a software application (Autodesk, Revit, Bentley MicroStation, SolidWorks, and as applicable) capable of embedding all information specific to that equipment which would typically be available in the required shop drawings and submittals. 2. Construct the models to accurately identify all of the physical components including: Length, width and height of equipment; weight of equipment; accurate location of all facility connection points; proper identification of required supports whether provided by the Trade Contractor or others; proper identification of required supports; access for maintenance and/or filter changes locations; and clearances. 3. Include all clearance requirements for the equipment as outlined by the equipment manufacturer and all applicable building codes. Identify clearances on a specific layer that can be turned off for coordination purposes. Identify clearances as solid planes (“no fly zones”) which will register as clashes during the coordination effort. 4. Provide equipment model information to the Construction Manager in its native (*.dwg) format as well as IFC format (IFC format describes the behavior, relationship, and identity of a component object within a model).

F. Schedule: Time is of the essence on this project. Trade Contractor is responsible for all efforts, methods, procedures and costs required to meet or better the scheduled dates.

1. If, at any time, it is determined by the Construction Manager or DCAMM Project Manager that this Trade Contractor is not on schedule for any reason within the control or responsibility of the Trade Contractor, the Trade Contractor shall increase its manpower or work such overtime as is required to bring the work back within the Project Schedule. Such additional efforts shall be performed at no additional cost to the Construction Manager or DCAMM (the Owner). 2. The proposed schedule includes “estimated” start dates for the construction activities. In the interest of the Project, the Construction Manager reserves the right to alter the sequencing of activities in order to accommodate the project conditions or DCAMM requirements.

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3. It is understood that the Trade Contractor shall be obligated to complete its activities within the specified durations regardless of the actual start date. Trade Contractor agrees to meet or better each duration.

G. Record Information: Trade Contractor shall maintain models during construction to match the “as built” condition of their installed work

PART 2 - PRODUCTS

2.1 DUCTWORK AND AIR DISTRIBUTION EQUIPMENT

A. Reference Standards: Material, construction and installation shall meet requirements of most recent editions of the following standards and references, except for more stringent requirements specified or shown on Drawings:

Standard As Applicable To:

SMACNA HVAC Duct Sheet Metal Ductwork; Construction Standards Duct Liners; Adhesives; Metal and Flexible Fasteners; Flexible Ductwork.

SMACNA HVAC Air Duct Leakage Test Manual

SMACNA Fibrous Glass Duct Fibrous Glass Ductwork; Tapes Construction Standards

SMACNA Ducted Electric Heat Electric Duct Heaters Guide for Air Handling Systems

SMACNA Thermoplastic Duct (PVC) PVC Ductwork Construction Manual

ADC and TIMA Flexible Duct Flexible Ductwork Performance Standards

NFPA 90A Fire Dampers; Fire Resistance Standards for Ducts and Liners

NFPA 96 Exhaust Ductwork

NFPA 45 Laboratories using chemicals

ADC Test Code 1062 R4 Ratings of Diffusers, Registers Grilles

SMACNA Guidelines for Welding Welded Galvanized, Black Iron Sheet Metal and Stainless Steel Ductwork

B. General

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1. Provide supporting and hanging devices necessary to attach entire HVAC system including ductwork and equipment, and to prevent vibration. 2. Provide vertical and horizontal supports as required by codes to meet minimum applicable earthquake resistance standards. 3. Ductwork shall be free from vibration under all conditions of operation. Dimensions shown on Drawings for lined ductwork are net inside dimensions. Increase ductwork to accommodate lining requirements. 4. Pipe or conduit crossing duct: a. No pipe, conduit, hanger, Architectural element nor structural member shall pass through duct without Designer ’s written approval. b. Where it is impossible to re route pipe or conduit and when written approval has been obtained, increase duct size to maintain constant cross sectional area at point of interference. Provide streamlined enclosure for pipe or conduit, as illustrated in SMACNA. 5. When making offsets and transformations necessary to accommodate structural conditions, preserve full cross sectional area of ductwork shown on Drawings. 6. Ductwork shall have pressure velocity classifications as follow:

DUCT STATIC SMACNA SMACNA CONSTRUCT PRESSURE PRESSURE SEAL LEAKAGE VELOCITY -ION CLASS RATING CLASS CLASS 10" 10" Pos.* A 3 2000 fpm or greater

6" 6" Pos.* A 3 2000 fpm or greater

4" 4" Pos.* A 3 4000 fpm or less 3" 3" Pos. or Neg. A 3 4000 fpm or less 2" 2" Pos. or Neg. A 6 2500 fpm or less 1" 1" Pos. or Neg. A 6 2500 fpm or less ½" ½" Pos. or Neg. A 6 2000 fpm or less *for negative pressures over 3" w.g., refer to SMACNA Round and Rectangular Industrial Duct Construction Standards for joint and intermediate reinforcement requirements.

7. Ductwork shall have pressure velocity classifications as follow:

DUCT STATIC SMACNA SMACNA CONSTRUCT PRESSURE PRESSURE SEAL LEAKAGE VELOCITY -ION CLASS RATING CLASS CLASS

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10" 10" Pos.* A 6 2000 fpm or greater

6" 6" Pos.* A 6 2000 fpm or greater

4" 4" Pos.* A 6 4000 fpm or less 3" 3" Pos. or Neg. A 6 4000 fpm or less 2" 2" Pos. or Neg. B 12 2500 fpm or less 1" 1" Pos. or Neg. B 12 2500 fpm or less ½" ½" Pos. or Neg. B 12 2000 fpm or less *for negative pressures over 3" w.g., refer to SMACNA Round and Rectangular Industrial Duct Construction Standards for joint and intermediate reinforcement requirements. a. Unless otherwise specified or shown on the drawings, the following pressure classifications shall be used for the types of ductwork listed below: 1) 4" Class: All supply ductwork from discharge of air units to inlets of terminal volume boxes. 2) 3" Class: All , kitchen hood and smoke exhaust ductwork. 3) 2" Class: All other ductwork.

8. Sealing Requirements for Class A, Leakage Class 3, Galvanized, Non-Welded Aluminum or Non-Welded Stainless Steel Ductwork: a. Transverse Joints 1) During assembly seal all flanged transverse joints with sealing tape of quality equal to Hardcast Inc. 1902-FR. Corners shall be sealed as described by SMACNA and when applicable per manufacturer's published procedures. After sealant has cured, seal entire joint with Hardcast Inc. RTA-50 adhesive on to Hardcast Inc. DT tape or approved equal. 2) Seal all non-flanged transverse joints with Hardcast Inc. RTA-50 adhesive on to Hardcast Inc. DT tape or approved equal. b. Longitudinal Seams 1) Seal all longitudinal seams during ductwork fabrication with Hardcast Inc. Cold Seal 1001 or approved equal. c. Joints and Ductwall Penetrations 1) Seal all duct joints at takeoffs, access doors, bearing penetrations, flexible duct connections etc., with Hardcast Inc. Versa Grip 102 or approved equal. 2) Note, access doors and damper rod penetrations shall be equipped with proper hardware for sealing. 9. Sealing Requirements for Class A, Leakage Class 6, Galvanized, Non-Welded Aluminum or Non-Welded Stainless Steel Ductwork.

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a. Transverse Joints 1) During assembly seal all flanged transverse joints with sealing tape of quality equal to Hardcast Inc. 1902-FR. Corners shall be sealed as described by SMACNA and when applicable per manufacturer's published procedures. 2) Seal all non-flanged transverse joints with Hardcast Inc. Versa Grip 102 or approved equal. b. Longitudinal Seams 1) Seal all longitudinal seams during ductwork fabrication with Hardcast Inc. Cold Seal 1001 or approved equal. c. Joints and Ductwall Penetrations 1) Seal all duct joints at takeoffs, access doors, damper bearing penetrations, flexible duct connections etc., with Hardcast Inc. Versa Grip 102 or approved equal. 10. Sealing Requirements for Class B, Leakage Class 12, Galvanized, Non-Welded Aluminum or Non-Welded Stainless Steel, Ductwork. a. Transverse Joints 1) During assembly seal all flanged transverse joints with sealing tape of quality equal to Hardcast Inc. 1902-FR. Corners shall be sealed as described by SMACNA and when applicable per manufacturer's published procedures. 2) Seal all non-flanged transverse joints with Hardcast Inc. Versa Grip 102 or approved equal. b. Longitudinal Seams 1) Seal all longitudinal seams during ductwork fabrication with Hardcast Inc. Cold Seal 1001 or approved equal. 11. Support a. Space hangers as required by SMACNA (8 ft max) for horizontal duct on 8 ft. centers, unless concentrated loadings require closer spacing. b. Support vertical duct on each floor or slab it penetrates. c. Supports for ductwork and equipment shall be galvanized unless specified otherwise. 12. Connections a. Connect inlets and outlets of air handling units and fans to ductwork with flexible connections unless fan has vibration isolator mounts inside unit with flexible connections and no external vibration isolators. Exception: Do not use flex on life safety smoke exhaust fans. b. Indoors, flexible connections shall be neoprene coated fibrous glass fire retardant fabric, by Ventfabrics, or Durodyne. Outdoors, flexible connections shall be Dupont hypalon coated fibrous glass fire , weather , and UV resistant by Ventfabrics or Durodyne. c. Secure flexible connections tightly to air handlers with metal bands. Bands shall be same material as duct construction. d. Connections from trunk to branch ducts shall be as detailed on Drawings. 13. Construction a. No sharp metal edges shall extend into air streams. b. Install drive slips on air leaving side of duct with sheet metal screws on 6" centers. c. Spin in collars shall NOT be used for branch connections in 3" or higher pressure class ductwork. 14. Joints a. Longitudinal lock seams shall be double locked and flattened to make tight joints.

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b. Make transverse joints, field connections, collar attachments and flexible connections to ducts and equipment with sheet metal screws or bolts and nuts. Do not use rivets and staples. 15. Prefabricated Transverse Duct Joints a. Transverse joints in galvanized sheet metal ductwork may be made with galvanized gasketed frame and angle duct joint system by Ductmate, TDF, TDC or approved equal. Angles shall be at least 20 gauge. Prefabricated transverse duct joints shall not be used for duct 16 GA. and heavier, nor for duct 23 GA. or . b. Secure angles to duct with screws (using clutched arbor) or spot welds spaced as recommended by manufacturer for duct pressure class. 16. Elbows and Bends a. Elbows and bends for rectangular ducts shall have centerline radius of 1 1/2 times duct width wherever possible. Elbows for grease exhaust and fume hood exhaust shall be full radius. Vanes or mitered duct are not allowed. b. Where centerline radius is less than 1 1/2 times duct width (on supply, return and exhaust ductwork), elbows shall be radius throat (square throat allowed when turning around column or other close objects) with radius heel. For elbows whose width is greater than 48 inches and/or where shown on plans, provide splitter vanes. Install vanes in accordance with SMACNA. Where multiple elbows are separated by less than ten duct diameters use splitter (full length) vanes. c. For round ductwork provide stamped elbows, with centerline radii equal to 1 1/2 times duct diameter, or gored elbows as follows:

Elbow Angle No. of Gores

0° - 36° 2 37° - 72° 3 73° - 90° 5 1) d. Elbows for flat oval ducts shall have centerline radii equal to 1 1/2 times duct diameter in plane of bend, or gored elbows with gores as specified for round ducts. 17. Access Panels/Doors a. Provide proper pressure and leakage rated, gasketed, duct mounted access panels/doors for the following items with minimum sizes, as indicated. Access doors shall be of double wall construction doors in insulated ducts shall be insulated. Gauges of door materials, no. of hinges, no. and type of door locks shall be as required by the SMACNA Duct Construction Standards. Hinged doors are not acceptable, screwed or bolted access panels are not acceptable. Doors shall be chained to frame with a minimum length of 6" to prevent loss of door. For seal Class A, access doors shall be leakage rated, neoprene gasketed UL 94 HF1 listed, DUCTMATE "sandwich" or approved equal. Door metal shall be the same as the attached duct material. For grease and high temperature ducts, door assembly shall be rated for 2300°F. The minimum sizes are: 1) Fire dampers 12" x 12", or larger. 2) Combination Fire/Smoke dampers 12" x 12", or larger. 3) Smoke dampers 6" x 6" minimum. 4) Automatic control dampers 6" x 6" minimum. 5) Manual volume dampers 2 sq. ft. and larger 6" x 6" minimum. 6) Inlet side to all coils 12" x 12", or larger. 7) Suction and discharge sides of inline fans 24" x 24" minimum.

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8) At additional locations indicated on drawings, or specified elsewhere 12" x 12" minimum. b. Generally access doors are not shown on the drawings, but shall be provided in accordance with the above. 18. Extractors shall have adjusting rod and locknut on outside of duct. 19. Connections to roof fans: a. Shall be at least 22 ga. galvanized steel soldered watertight. b. Solder side seams at least 12" up from bottom. c. Provide suitable dielectric gaskets to join dissimilar materials. 20. Plenums and connections to : a. Shall be 18 ga. minimum cross broken and properly reinforced with galvanized angle irons to SMACNA requirements. b. Shall have bottom and corner seams soldered watertight at least 12" up from bottom. c. Shall have neoprene gaskets or other non corrosible material to make connections to louvers watertight. d. Shall pitch connection back towards the . Provide half coupling drain connection at bottom of plenum unless noted otherwise Pipe drain to nearest floor drain. e. Shall have unused portions of louvers blocked-off with sheet metal; sealed air and water tight; insulated with 2" thick 6 lb. density rigid or board insulation. 21. Duct Pressure Tests a. Pressure test ducts after takeoffs and wall penetrations are in place and before applying exterior insulation. Correct any leaks. b. Pressure and leak test 100% of medium and low pressure duct work at 150% of duct construction class pressure. Duct shall be constructed so there is no joint or structural failure at the test pressure. 22. Duct Leakage Tests a. Leak testing shall be per SMACNA HVAC Air Duct Leakage Test Manual. Provide orifice assembly including straightening vanes, orifice plate mounted in straight tube with properly located pressure taps, and U tube manometer or other device as specified by SMACNA. Orifice assembly shall be calibrated accurately and shall come with calibration curve. Leakage classes shall be as previously specified. Submit leak test report (per SMACNA format) for Designer review. Drawings of ductwork tested shall also be submitted with report, indicating presence of takeoffs, wall penetrations, joints, etc. 23. Materials a. Sheet metal ducts shall be constructed of hot dipped galvanized sheet metal with G90 Commercial coating according to ASTM 527 unless specified otherwise. b. Stainless steel (SS) ductwork shall be 18 gauge for kitchen hoods; and as required by SMACNA for other ducts. Materials shall be 316/No. 4 finish for exposed duct, 304/No. 1 finish for concealed ducts. Joints and seams shall be welded as required by SMACNA Guidelines for Welding Sheetmetal. c. Aluminum ductwork shall be Alclad 3003 1414 or alloy 5052 H32, of thickness required by the SMACNA duct construction standards with Alloy 6061 bracing angles, and Pittsburgh lock longitudinal corner and double side seaming. d. Flexible Ductwork 1) Flexible ductwork, connecting to uninsulated or unlined duct, shall be polyester core with corrosion resistant helical wire reinforcing. The polyester core shall be minimum two ply and shall have a minimum thickness of 0.0017". Flex duct shall be U.L. rated for 6" W.C. positive

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pressure, 2" W.C. negative pressure with a maximum velocity of 4000 FPM. Flexduct must be listed as a Class 1 Connector according to UL 181 and shall meet the requirements of NFPA 90A maximum ASTM E 84 fire hazard rating shall be 25 flame spread, 50 fuel contributed and 50 smoke developed. Uninsulated flexible duct shall be equivalent to Wiremold, Type WB, or Flexmaster Types 2 and 4 (not type 9). 2) Flexible duct connected to insulated or lined duct shall also be insulated and shall be equivalent to Wiremold Type WK or Flexmaster Types 2 or 4 (not type 9), with 1 1/2", 3/4 lb. density fiberglass insulation and an aluminized reinforced . 3) Submittals shall include data on no. of polyester plies and minimum thickness of polyester core, in addition to other data listed above required to ensure that submitted product meets the requirements of these specifications. 4) If flexduct other than the model numbers of the vendors listed above is submitted, a sample of the flex shall be submitted to the Designer. The Designer shall have sole discretion in determining whether the submitted flex is equivalent to that of the named vendors above. 5) Unless otherwise indicated, flexible duct shall not exceed 5'-0" long. e. Rigid PVC ductwork shall be thermally formed ASTM D 1784 69 Class 12454 B with 3/16" thick wall.

C. 2" and Lower Pressure Class Ductwork, Rectangular:

1. Ducts wider than 19" with more than 10 square feet of unbraced panel shall be beaded or cross broken. 2. Internal stiffening struts shall only be used upon prior written approval of the Designer. 3. Make changes in duct size with tapered connections as required by SMACNA. Changes shall NOT exceed 30°from line of air flow. Take off to the diffusers shall be 45° leading edge type or Bellmouth type. 4. Transverse joints shall be TDF/TDC or slip joints; use flat or standing seam according to SMACNA. Where duct size requires standing seam but space restrictions dictate flat seam, notify Designer prior to fabrication.

D. 2" and Lower Pressure Class Ductwork, Round:

1. Joints a. Longitudinal joints shall be spiral seam, butt welded, lap and seam welded, or ACME lock grooved seam. Snap lock seams shall be used on ½" w.g. pressure class duct only. b. Transverse joints shall be beaded sleeve joint or other approved joints listed in SMACNA. Use three or more sheet metal screws at 15" uniform intervals along circumference of joints. 2. Branch fittings shall be conical tee (Buckley or equal) or combination tee as shown in SMACNA. a. 3" and 4" Pressure Class Ductwork Rectangular 3. Joints a. Joints shall be prefabricated type by TDC, TDF or Ductmate. See Prefabricated Joints paragraph for specific requirements. 4. Duct reinforcement spacing and type shall comply with SMACNA. 5. Ductwork on both sides of transitions shall be run in same horizontal axis.

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6. Diverging section slope shall be 1 1/2" per foot or less if possible. 7. Contraction section slope shall not exceed 7" per foot. 8. Takeoffs shall be 45° leading edge type except that Bellmouths (Buckley or equal) may be used for takeoffs to terminal boxes if the distance between the box and point of takeoff is less than 8 ft. 9. Ducts with an aspect ratio greater than 3:1 shall be minimum of 18 gauge unless a thicker gauge is required by SMACNA.

E. 3" and 4" Pressure Class Ductwork, Flat Oval, Single Wall

1. Joints a. Ducts shall have spiral lock seams or longitudinal seams. Seams and joints in fittings shall be continuously welded. If coating is damaged during welding, repair joints to prevent corrosion. b. Transverse joints shall be slip or flanged.

F. 3" and 4" Pressure Class Ductwork, Round, Single Wall

1. Joints a. Longitudinal seams shall be lock spiral, lock longitudinal or butt welded longitudinal. b. Transverse joints shall be slip joints. Draw band joints shall be used on longitudinal seam duct only. Loose flange Vanstone joints may be used on ducts over 36" in diameter. c. Seams and joints in fittings shall be continuously welded. If coating is damaged during welding, repair joints to prevent corrosion. 2. Branch fittings shall be conical tee or combination tee as detailed in SMACNA.

G. 6" and 10" Pressure Class Ductwork, Rectangular

1. Joints a. Transverse joint shall be inside slip joint, double S slip joint, welded flange joint, or companion angle flanged joint. b. Longitudinal seam shall be ACME grooved seam or Pittsburgh lock seam. c. Button punch snap lock seams shall not be used. 2. Duct reinforcement spacing and type shall comply with SMACNA. 3. Transitions shall be followed by section of straight duct with axes of two connected duct sections coinciding. 4. Expansion section slope shall be 1 1/2" per foot or less. 5. Contraction section slope shall be 7" per foot or less. 6. Take offs shall be tapered or conical.

H. 6" and 10" Pressure Class Ductwork, Flat Oval, Single Wall

1. Joints a. Ducts shall have spiral lock seams or longitudinal seams. Seams and joints in fittings shall be continuously welded. If coating is damaged during welding, joints shall be repaired to avoid corrosion. b. Transverse joints shall be slip or flanged joints.

I. 6" and 10" Pressure Class Ductwork, Round, Single Wall

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1. Joints a. Longitudinal seams shall be lock spiral, lock longitudinal or butt welded longitudinal. b. Transverse joints shall be slip joints. Draw band joints may be used only on longitudinal seam duct. Loose flange Vanstone joints may be used on ducts over 36" in diameter. c. Seams and joints in fittings shall be continuously welded. If coating is damaged during welding, joints shall be repaired to prevent corrosion. d. Take offs shall be conical.

J. Double Wall Ductwork

1. Duct and fitting shall be United Sheet Metal Co., Acousti K27, type P or Semco consisting of: a. External pressure tight shell of zinc coated steel. b. Uniformly packed, 1" layer of fire resistant fibrous glass insulation with K factor of 0.27 with mylar or foil liner meeting 25/50 flame spread/smoke developed rating. c. Internal perforated protective metal liner of zinc coated steel, with holes sized and spaced to give acoustic impedance of noise reduction characteristic of Acousti K27 duct. 2. Pressure shell of round duct shall be United or approved equal spiral pipe and pressure shell of fittings shall be zinc coated steel, as follows: Gauge of Item Size Pressure Shell Duct 3" to 6" 26 7" to 20" 24 21" to 34" 22 36" to 48" 20 Fitting 3" to 34" 20 36" to 48" 18 3. Fittings shall be continuous, corrosion resistant welds made by certified welders. 4. Joints between straight duct sections shall be made with pre fabricated couplings with 4" shoulder inserted into duct.

K. Flexible Rigid Duct

1. Flexible ductwork shall be Flexmaster Triple Lock Buck Duct Flexible Air Duct (insulated or non insulated) as manufactured by Buckley Associates or equal (617 878 5000). Flexible duct, non insulated, shall be Underwriters Laboratory Listed UL 181 Class 0 air duct and constructed in accordance with NFPA Standards 90A and 90B. It shall have a smoke/flame spread rating of 50/25. 2. Duct shall be made from a tape of dead soft aluminum sheet, spiral wound into a tube and spiral corrugated to provide strength and stability. The joint shall consist of a triple lock mechanically performed without the use of adhesives to make a durable airtight seam. A double lock is not acceptable.

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3. Flexible duct connected to insulated or lined duct shall also be insulated. Flexmaster insulated flex shall have a gray Fire Retardant Polyethylene outer jacket with a ½ lb. density, 1 1/2" thick fiberglass insulation blanket, factory wrapped. Flexible Duct, insulated, shall be Underwriters Laboratory Listed and constructed in accordance with NFPA standards 90A and 90B. It shall have a smoke/flame spread rating of 50/25. 4. The flexible duct shall be supported as required. 5. Flexible duct work shall be rated at 12" positive pressure. Duct from 3 to 16" shall have a negative pressure of 12", 8" for duct work 18 and 20. 6. All flexible duct shall be individually cartoned and labeled for delivery to the job site for maximum protection. 7. Submittals shall include data on minimum thickness of aluminum core, in addition to other data listed above, required to ensure that submitted product meets the requirements of these specifications. 8. Provide sealing compound for installation. See further paragraphs in this specification and details for other installation requirements.

L. Fibrous Glass Duct Board Ductwork 1. Provide CertainTeed, Knauf, Owens Corning or Manville heavy duty, E1 800, fibrous glass duct board with foil and kraft facing where shown on Drawings. Duct board shall be 1" thick with maximum K factor of 0.23 and 0.75 noise reduction coefficient. Board edges shall form molded slip joints. Insulation shall meet manufacturer's requirements. 2. Fibrous glass duct board ductwork shall meet requirements of SMACNA Fibrous Glass Duct Construction Standard, NFPA 90A and 90B and UL 181. 3. Fabrication and installation of duct and fittings including closure systems for longitudinal seams and transverse joints shall meet requirements of latest edition of SMACNA Fibrous Glass Duct Construction Standard. 4. Joints shall be stapled and sealed with (manufacturers heat activated strip) (SMACNA registered pressure sensitive tape).

M. Thermoplastic Ductwork (PVC)

1. PVC duct installation shall be as recommended by SMACNA Thermoplastic (PVC) Duct Construction Manual. 2. Butt weld longitudinal and transverse joints with hot gas filter rod welding. Rods shall be compatible with material specified for duct. Stagger longitudinal seams. Weld transverse seams on 8 foot centers. 3. Taper transition pieces 5" in length for each 1" change in diameter. 4. Provide welded 4" wide reinforcing sleeve straps where recommended by SMACNA. 5. Provide expansion joints where recommended and as specified by SMACNA. 6. Provide suitable hangers and supports on eight foot centers that coincide with transverse joints as recommended by SMACNA.

N. Sheet Metal Duct, Underground

1. Underground duct shall be rectangular or round as shown on Drawings. Duct shall be hot dipped galvanized sheet steel per ASTM A525, fabricated as required by SMACNA, coated with 4 mils of PVC. Use touch up kit to maintain PVC coating at all joints and where scratched. 2. Seal joints with approved duct sealer appropriate for pressure class. 3. Encase duct in hand rodded, light weight, insulating concrete at least 3" thick. Do not use powered vibrators.

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O. Carbon Monoxide Exhaust

1. Carbon monoxide ductwork above ground shall be medium pressure classification, 18 gauge minimum, with soldered, air tight joints. 2. Carbon Monoxide Underground Ductwork a. Underground ductwork including fittings shall be filament wound fibrous glass reinforced plastic with UL listed Class 1 foil scrimmed kraft liner by Peabody Sunstrand or approved equal, installed as recommended by manufacturer. b. Join duct sections with galvanized sheet metal sleeves inside of duct, secured with sheet metal screws. c. Apply extruded bead of non hardening waterproof mastic to end of one duct to be joined. Press other duct tightly against bead; secure with screws. d. Wrap joints with waterproof tape, covering screw heads. e. Install in trench and observe and coordinate with backfilling with 4" of pea gravel cover or dry sand. f. Duct shall have ICBO approval and shall meet standards required by ICBO complying with UMC Standard 10 1 for non metallic duct. g. Pitch duct 1" per 40 ft. towards drain.

P. Fire Dampers

1. Provide fire dampers throughout air distribution system as required by applicable codes, standards and authorities. Provide access door for each of sufficient size to repair internal link (see access panel/door section). Fire dampers indicated on drawings may not fully represent the exact number required for this project. It is the contractor’s responsibility, at no additional cost to the DCAMM, to provide all required dampers. 2. Dampers shall be approved fusible link self closing spring loaded type, Buckley Model 150B or approved equal by Nailor Industries, Prefco or Ruskin. 3. Frame shall be fitted with angle iron stop and stainless steel spring latch, and shall be securely fastened to building construction. 4. Seal spaces between damper frames and walls and between damper frames and floor with approved fire retardant material. 5. Use of dampers shall NOT reduce net free area of duct below that shown on Drawings. Fire dampers shall be Type B with blades of dampers out of air stream. 6. Samples of fire dampers shall be submitted to and approved by local authorities having jurisdiction. 7. Dampers shall bear 1 1/2 hour UL rating fire damper label and shall be constructed and installed as required by UL 555. 8. Dampers shall be installed per SMACNA with breakaway connections and nose pieces on duct liner (see SMACNA HVAC Duct Construction Standards).

Q. Ceiling Radiation Dampers and Fire Rated Blankets

1. For fire rated ceiling assemblies, provide at all ceiling diffusers, registers and grilles: Radiation dampers (Nailor Industries Series 0700 or approved equal) and Fire Blanket (Nailor Industries 0725 or approved equal) or fire assembly: radiation damper and blanket already assembled Nailor or equal.

R. Volume Dampers

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1. Provide Young Regulator manual adjustable rectangular opposed blade dampers for duct heights less than 12" with factory installed locking hand quadrants extended 2" for all dampers installed in externally insulated duct: a. On each supply, return and general exhaust duct take off. b. At each take off to register, or diffuser (not all are shown on Drawing). 2. Dampers are manufactured approximately 5/16" smaller in width and 1/8" smaller in height than size of duct in which they are installed; e.g., nominal damper size is 24" x 10"; actual size is approximately 23 11/16" x 9 7/8". 3. Damper frame shall be constructed of #6063 extruded aluminum reinforced channel with minimum thickness of .050". Opposed damper blades shall be #6063 extruded aluminum with minimum thickness of .050" and shall include reinforcing ribs. Each blade shall be supported in the damper frame by individual Teflon axle bearings, and shall be driven by stainless steel connecting slide linkage controlled by 3/8" square steel control shaft. 4. Note: All required volume dampers may not be indicated on drawings but dampers shall be provided as necessary for systems balancing. 5. Dampers 12" and larger in height shall be opposed multi blade equal to Greenheck, Nailor, or Vent Products. 6. Where dampers are inaccessible, use Young Regulator locking type ceiling regulators and miter gear or worm gear for all horizontal dampers. Bearing coupling for bottom duct control may be used for shaft on vertical blade dampers. The 3/8" rod between ceiling regulator and damper shall be provided by contractor. 7. Damper blades shall be two gauges heavier than adjoining ductwork, and shall be riveted to supporting rods. Hem over edges parallel to rods. 8. Brackets shall be galvanized metal, secured to ductwork with sheet metal screw with locking quadrant arms (see seal class section for additional requirements). Provide 2" handle extension for all dampers on externally insulated ductwork. 9. Note: All required volume dampers may not be indicated on Drawings but dampers shall be provided as necessary for system balancing.

S. Automatic Dampers: Install automatic dampers furnished under Automatic Temperature Control Paragraph of this Section, as shown on Drawings, and as specified. Provide sealed wall penetrations for Seal Class A ductwork.

T. Diffusers, Registers and Grilles

1. Provide diffusers, registers and grilles for supply, return and exhaust outlets, of size, type and design shown on Drawings. Acceptable manufacturers shall be Anemostat, Krueger, Metalaire or Titus. 2. Equipment shall be tested and rated per ASHRAE 91-70. 3. Equipment shall handle air quantities at operating velocities: a. With maximum diffusion within space supplied or exhausted. b. Without objectionable air movement as determined by Designer. c. With sound pressure level not to exceed NC 30. 4. Supply, return and exhaust outlets shall have opposed blade volume dampers operable from front. 5. Supply registers shall have two sets of directional control blades. 6. Diffusers within same room or area shall be of same type and style to provide architectural uniformity. 7. Diffusers, registers and grilles shall be furnished with gaskets and installed with faces set level and plumb, tightly against mounting surface. 8. Finish shall be as directed by Designer.

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9. Coordinate diffusers, registers and grilles with ceiling and wall construction. Refer to Architectural Drawings for exact lengths and for framing and mitering arrangements that may differ from those shown on HVAC Drawings.

U. Kitchen Hood Exhaust Duct

1. Furnish and install, where indicated on the drawings, a factory built Underwriters Laboratories, Inc. listed as manufactured by Van Packer Co, Metalbestos, or Metalfab. The chimney shall be listed by UL as a "Grease Duct for Restaurant Cooking Appliances." 2. The grease duct manufacturer shall furnish all items which form a part of the assembly, including tee sections, straight sections, elbows, end caps, cleanouts, expansion joints, fan/hood transitions, supports, flashing, counter flashing, and insulated roof thimble where required. Each section shall be the factory applied Underwriters Laboratories label. 3. Installation shall be made in accordance with the manufacturer's recommendation and in compliance with the Underwriters Laboratories, Inc. listing. 4. All grease duct sections shall be of double wall construction with a 1" air space between the liner and the shell. The liner shall be 20 gauge, type 304 stainless steel and the shell shall be of 24 gauge aluminized steel. 5. All sections shall be joined with a vee band sealed with acid resistant hi temp joint cement. Silicone sealant shall also be used on the drawband on exterior installations. Parts exposed to the atmosphere shall be given one prime coat and one finish coat of heat resistant paint (supplied by the installing or painting contractor). 6. Diameter and layout shall be as indicated on the drawings. 7. Provide cleanout openings with grease tight access panels at each change of direction and at 10 ft. intervals along straight duct runs. 8. Provide dished pan at bottom of risers with 2" half coupling, removable plug, welded to bottom center of pan. 9. Diverging and converging transitions shall not exceed 20°from line of air flow. 10. 1Horizontal duct sections shall not form grease traps and shall pitch toward hood as required by NFPA. 11. 1Vertical and horizontal interior duct shall have fire resistant cover or enclosure, and spacing from combustible surfaces, etc. as defined by NFPA and in accordance with manufacturers instructions.

V. Duct

1. Discharge ductwork shall be 16 gauge stainless steel, water proof and detergent proof, all welded construction. 2. Provide 16 gauge stainless steel volume damper at each dishwasher discharge connection. 3. Pitch ductwork toward dishwasher. 4. Duct shall be #316/No. 4 finish for exposed areas and #304/No. 1 finish for concealed areas.

W. Shower Exhaust Ductwork

1. Shower exhaust ductwork shall be aluminum, of types as detailed in this specification above and constructed in accordance with SMACNA except that Seal Class shall be "A" regardless of duct pressure rating.

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X. Branch Duct Take off Fittings

1. Contractor shall provide Buckley Bellmouth Take offs at all branch duct locations. 2. Bellmouth Fitting shall be Model BMD with damper. In areas where sufficient duct height is not available, the contractor shall provide the Buckley Mini mouth fitting, Model M BMD with damper or the flat oval Bellmouth, Model FOBMD with damper. 3. Bellmouths shall be constructed of heavy duty galvanized steel. Bellmouths shall include an air tight Neoprene gasket to ensure a tight fitting with minimal leakage. Pre drilled holes shall be provided for quick mounting. Bellmouth shall be as manufactured by Buckley Associates or equal (617 878 5000). 4. Standard damper hardware to be constructed of 26 gauge galvanized material with a quadrant damper and tight fitting gasketing to ensure minimal leakage at damper pivot points. 5. Optional heavy duty hardware shall be provided at locations of higher static pressure where shown on the drawings. 6. Ninety degree take offs are not permitted on this project.

2.2 ACOUSTICAL DUCT LINING

A. Provide 1" thick hospital grade, close cell foam liner by IMCOA EPFI or equal in accordance with article 2.02. No fiberglass is allowed.

B. Increase duct dimensions to accommodate lining while maintaining inside clear dimensions shown on the drawings.

C. Provide lining as indicated on Drawings.

D. Materials and installation shall meet following standards, as applicable:

1. NFPA 90A, UL723 (Class I), NFPA-255 2. SMACNA Duct Liner Applications Standard 3. SMACNA Mechanical Fasteners Standard 4. Adhesive and Sealant Council: Adhesives Standard for Duct Liner ASC A 7001A 5. ASTM E 84 fire hazard classifications of 25 flame spread, 50 smoke developed, and 50 fuel contributed. 6. Minimum sound transmission. Class rating (STC) of 11.

E. Duct liner shall be installed without interruptions or gaps, using 100% coverage of adhesive and mechanical fasteners. Mechanical fasteners shall be welded or secured mechanically to duct on 12" maximum centers.

F. Cut liner to ensure overlapped and compressed longitudinal joints at corners. Transverse joints in liner shall abut precisely. Seal joints against fiber entrainment with approved adhesive, as recommended by manufacturer. Use sheet metal nosing at beginning of lining (in direction of flow) to minimize erosion.

G. The contractor shall ensure the integrity of acoustical lining when slip in duct heaters are installed; loose lining shall not flap about in the airstream. Secure edges of lining with sheet metal nosing, where liner is interrupted to make room for the slip in heaters.

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H. Submit samples and catalog data for duct liner, mechanical fasteners, and adhesive to Designer for approval.

I. Mylar used for vapor barrier shall meet ASTM E-84 classification.

J. Do not insulate lined duct except for AHU-7, 8, 9 systems.

K. Omit 36" of lining at electric duct coils as indicated.

2.3 DUCT SILENCERS

A. Provide prefabricated duct silencers as scheduled and as described herein, at locations shown on Drawings, by Industrial Acoustics, United Sheet Metal, or Commercial Acoustics. Industrial Acoustics model designations and performance data are specified to establish standard of quality for material and performance.

B. Materials:

1. Outer casings of rectangular silencers shall be made of 22 gauge type #G-90 lock former quality galvanized steel. 2. Outer casings of tubular silencers shall be made of type #G-90 lock former quality galvanized steel in the following gauges:

OUTSIDE DIAMETER METAL GAUGE

12-36 in. 22 ga. 38-60 in. l8 ga.

3. Interior partitions for rectangular silencers shall be not less than 26 gauge type #G-90 galvanized lock former quality perforated steel. Interior construction of tubular si¬lencers shall be compatible with the respective outside casing. 4. Filler material shall be inorganic glass fiber of a proper density to obtain the specified acoustic performance and be packed under not less than 5% compression to eliminate voids due to vibration and settling. Material shall be inert, vermin and moisture proof. 5. Combustion ratings for the silencer acoustic fill shall be not greater than the following when tested to ASTM E 84, NFPA Standard 255, or UL No.723: a. Flamespread Classification: 20. b. Smoke Development Rating: 20.

C. Construction

1. Units shall be constructed in accordance with the ASHRAE Guide recommendations for high pressure duct work. Seams shall be lock formed and mastic filled. Rectangu¬lar casing seams shall be in the corners of the silencer shell to provide maximum unit strength and rigidity. Interior partitions shall be fabricated from single piece, margin perforated sheets and shall have die-formed entrance and exit shapes so as to provide the maximum aerodynamic efficiency and minimum self-noise characteristics in the sound attenuator. Blunt noses or squared off partitions will not be accepted. 2. Attachment of the interior partitions to the casing shall be by means of an interlock¬ing track assembly. Tracks shall be solid galvanized steel and shall be welded to the outer

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casing. Attachment of the interior partitions to the tracks shall be such that a minimum of 4 thicknesses of metal exist at this location. The track assembly shall stiffen the exterior casing, provide a reinforced attachment detail for the interior par¬titions, and shall maintain a uniform airspace width along the length of the silencer for consistent aerodynamic and acoustic performance. Interior partitions shall be additionally secured to the outer casing with welded nose clips at both ends of the sound attenuator. 3. Interior partitions for tubular silencers shall be secured with galvanized steel radial mounting brackets welded to the partition and the outer casing. The radial brackets shall be installed full length and at 120 degree angles to each other to assure uniform spacing for consistent aerodynamic and acoustic performance. 4. Sound attenuating units shall not fail structurally when subjected to a differential air pressure of 8 inches water gauge from inside to outside the casing. Airtight construc¬tion shall be provided by use of a duct sealing compound on the job site material and labor furnished by the contractor.

D. Acoustic Performance

1. All silencer ratings shall be determined in a duct-to-reverberant room test facility which provides for airflow in both directions through the test silencer in accordance with ASTM Specification E-477. The test set-up and procedure shall be such that all effects due to end reflection, directivity, flanking transmission, standing waves and test chamber sound absorption are eliminated. Acoustic ratings shall include Dynamic Insertion Loss (DIL) and Self-Noise (SN) Power Levels both for FORWARD FLOW (air and noise in same direction) and REVERSE FLOW (air and noise in opposite directions) with airflow of at least 2000 fpm entering face velocity. Data for rectangular and tubular type silencers shall be presented for tests conducted using silencers no smaller than the following cross- sections: a. Rectangular, in. - 24x24, 24x30, or 24x36 b. Tubular, in. - 12, 24, 36, and 48

E. Aerodynamic Performance

1. Static pressure loss of silencers shall not exceed those listed in the silencer schedule as the airflow indicates. Airflow measurements shall be made in accordance with ASTM specification E-477 and applicable portions of ASME, AMCA, and ADC air¬flow test codes. Tests shall be reported on the identical units for which acoustic data is presented.

F. Certification

1. With submittals, the manufacturer shall supply certified test data on Dynamic Inser¬tion Loss, Self-Noise Power Levels, and Aerodynamic Performance for Reverse and Forward Flow test conditions. Test data shall be for a standard product. All rating tests shall be conducted in the same facility, shall utilize the same silencer, and shall be open to inspection upon request from the Designer.

G. Duct Transitions

1. When transitions are required to adapt silencer dimensions to connecting duct work they shall be furnished by the installing contractor.

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2.4 DUCT INSULATION

A. General

1. Insulation shall be CertainTeed, Knauf, Manville or Owens Corning. Install insulation, mastics, adhesives, coatings, covers, weather protection and other work exactly as required by manufacturer's recommendations. Materials shall meet requirements of Adhesive and Sealant Council Standards and SMACNA. 2. Apply insulation after systems have been tested, proved tight and approved by Designer. Remove dirt, scale, oil, rust and other foreign matter prior to installation of insulation. 3. Leaks in vapor barrier or voids in insulation will not be accepted. 4. ASTM E 84 minimum fire hazard ratings shall be 25 flame spread, 50 fuel contributed and 50 smoke developed. 5. Where ducts are insulated, flexible connections to ducts shall be insulated. 6. Insulate standing seams with same material and thickness as duct. 7. Acoustically lined ductwork shall not be insulated externally, except as noted otherwise. 8. Return ductwork in ceiling plenums shall not be insulated. 9. Insulation shall be continuous through wall and ceiling openings and in sleeves. 10. Transmission rates of vapor barriers shall not exceed 0.02 perms. 11. Do not insulate fibrous glass duct.

B. Concealed Rectangular, Flat Oval and Circular Ductwork

1. Insulate supply and fresh air ducts and plenum in concealed spaces and return duct not in ceiling plenum with 1 1/2" thick fibrous glass duct wrap, with foil kraft flame resistant vapor barrier. 2. Insulation density shall be 3/4 lb/cf and maximum K factor shall be 0.30 at 75°F mean temperature. 3. If insulation does not have pre cut lap, make lapped butt joints by cutting 2" strip of insulation away from vapor barrier. Apply 6" strips of approved adhesive on 16" centers and wrap duct with insulation. Staple lapped joint with outward clinching staples. Seal stapled joints air tight with approved vapor barrier mastic or pressure sensitive tape. 4. For rectangular duct 24" or larger in any dimension, augment application method specified in item 3 with approved mechanical fasteners, such as weld pins with speed washers, on 18" centers on bottom of duct. 5. Cover breaks in vapor material with patches of same material, secured with adhesive and staples. Seal staples with approved vapor barrier coating. 6. Fill voids in insulation at jacket penetrations and seal with vapor barrier coating. 7. Seal and flash terminations and punctures with fibrous glass cloth between two coats of vapor barrier coating. 8. Terminate vapor barrier and extend insulation at standoff brackets.

C. Exposed Rectangular Ductwork

1. Insulate exposed supply, return and fresh air ducts and exposed plenum with 1" thick, semi rigid fibrous glass boards with factory applied fire retardant foil reinforced kraft vapor barrier facing. 2. Insulation density shall be 3 lb./cf with maximum K factor of 0.23 at 75°F mean temperature. 3. Impale insulation on mechanical fasteners applied to duct surface on 12" centers. Use at least two rows of fasteners on each side of duct. Provide fastener rows within 3" of

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seams and edges. Secure insulation with suitable speed washers or clips firmly embedded in insulation. Provide additional fasteners as necessary on cross broken ducts. 4. Extend insulation to standing seams, reinforcing, and other vertical projections 1" and less; do not carry over. Vapor barrier jacket shall be continuous across seams, reinforcing and projections. Insulation and jacket shall be carried over projections that exceed insulation thickness. 5. Transverse joints shall be butted tightly. Longitudinal joints shall be butted, ship lapped or 45°mitered. Seal joints with 4" wide strips of approved vapor barrier patch material and adhesive, or with approved pressure sensitive vapor barrier tape. 6. Cover breaks, ribs and standing seam penetrations with patch of jacket material no less than 2" beyond break; secure with adhesive and staple. Seal staples and joints with brush coat of vapor barrier coating. 7. Fill voids in insulation at jacket penetrations and seal with vapor barrier coating. 8. Seal and flash terminations and punctures with fibrous glass cloth between two coats of vapor barrier coating. 9. Terminate vapor barrier and extend insulation at standoff brackets.

D. Exposed Round and Flat Oval Ductwork

1. Exposed supply and fresh air ducts and exposed plenum, which are located in mechanical and electrical rooms, storage rooms, unoccupied areas, unconditioned areas and/or as indicated on plans, shall be insulated with at least 1 1/2" fibrous glass ductwrap with foil kraft flame resistant vapor barrier. 2. Insulation density shall be 3/4 lb/cf and maximum K factor shall be 0.30 at 75°F mean temperature. 3. If insulation does not have pre cut lap make lapped butt joints by cutting 2" strip of insulation away from vapor barrier. Apply 6" strips of approved adhesive on 16" centers and wrap duct with insulation. Staple lapped joint with outward clinching staples. Seal stapled joints air tight with approved vapor barrier mastic or pressure sensitive tape. 4. Cover breaks in vapor material with patches of same material, secured with adhesive and staples. Seal staples with approved vapor barrier coating. 5. Fill voids in insulation at jacket penetrations and seal with vapor barrier coating. 6. Seal and flash terminations and punctures with fibrous glass cloth between two coats of vapor barrier coating. 7. Terminate vapor barrier and extend insulation at standoff brackets. 8. Cover with fibrous glass cloth embedded between two coats of suitable water proof coating. Total dry film thickness shall be 1/8". 9. Cover insulation with 6 oz./sq. yd. canvas coat adhered with approved fire retardant lagging adhesive.

E. Outdoor Round Duct Insulation and Water Proofing

1. Provide 3" thick fibrous glass duct wrap with foil kraft flame resistant vapor barrier. 2. Insulation density shall be 3/4 lb/cf and maximum K factor shall be 0.30 at 75°F mean temperature. 3. If insulation does not have pre cut lap make lapped butt joints by cutting 2" strip of insulation away from vapor barrier. Apply 6" strips of approved adhesive on 16" centers and wrap duct with insulation. Staple lapped joint with outward clinching staples. Seal stapled joints air tight with approved vapor barrier mastic or pressure sensitive tape. 4. Cover breaks in vapor material with patches of same material, secured with adhesive and staples. Seal staples with approved vapor barrier coating.

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5. Fill voids in insulation at jacket penetrations and seal with vapor barrier coating. 6. Seal and flash terminations and punctures with fibrous glass cloth between two coats of vapor barrier coating. 7. Terminate vapor barrier and extend insulation at standoff brackets. 8. Provide aluminum jacket with 2" lapped joints on round ductwork. Secure with bands at circumferential laps and at 12" intervals. Orient longitudinal laps to shed water. Fill transverse joints and longitudinal seams with weather proof coating. Seal joints with weatherproof coating where vapor barrier abuts uninsulated surface. Factory fabricated longitudinal Pittsburgh Z joint with bands that seal transverse joints and hold jacket in place may be used.

F. Outdoor Rectangular Duct Insulation and Water proofing

1. Provide 2" thick, semi rigid fibrous glass boards with factory applied fire retardant foil reinforced kraft vapor barrier facing. 2. Insulation density shall be 3 lb./cf with maximum K factor of 0.23 at 75°F mean temperature. 3. Impale insulation on mechanical fasteners applied to duct surface on 12" centers. Use at least two rows of fasteners on each side of duct. Provide fastener rows within 3" of seams and edges. Secure insulation with suitable speed washers or clips firmly embedded in insulation. Provide additional fasteners as necessary on cross broken ducts. 4. Extend insulation to standing seams, reinforcing, and other vertical projections 1" and less; do not carry over. Vapor barrier jacket shall be continuous across seams, reinforcing and projections. Insulation and jacket shall be carried over projections that exceed insulation thickness. 5. Transverse joints shall be butted tightly. Longitudinal joints shall be butted, ship lapped or 45°mitered. Seal joints with 4" wide strips of approved vapor barrier patch material and adhesive, or with approved pressure sensitive vapor barrier tape. 6. Cover breaks, ribs and standing seam penetrations with patch of jacket material no less than 2" beyond break; secure with adhesive and staple. Seal staples and joints with brush coat of vapor barrier coating. 7. Fill voids in insulation at jacket penetrations and seal with vapor barrier coating. 8. Seal and flash terminations and punctures with fibrous glass cloth between two coats of vapor barrier coating. 9. Terminate vapor barrier and extend insulation at standoff brackets. 10. Provide corner angles on exposed corners of insulation. Apply two coats of weatherproof mastic coating with glass cloth embedded between coats. Glass cloth overlaps at joints and adjoining surfaces shall be at least 2". Total dry film thickness shall be 1/8".

G. Outdoor Rectangular Duct Insulation and Water proofing

1. Provide 2" thick, 6 lb./cf density fibrous glass rigid board insulation with maximum K factor of 0.22 at 75°F mean. Secure with 100% coverage of approved adhesive and mechanical fasteners, such as weld pins with speed washers, spaced as required by manufacturer's installation instructions. 2. Boards shall be cut or grooved to fit duct and to form compressed, overlapped or mitered longitudinal joints oriented to shed water. 3. Apply two coats of bitumastic coal tar vapor barrier to outer duct insulation surface, with woven glass cloth embedded between first and second coats. Water proofing shall not allow transmission of water vapor. Total dry film thickness shall be 1/8".

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H. Outdoor Duct Insulation and Water proofing

1. Provide 2" thickness of flexible unicellular elastomeric foam rubber sheet insulation by Armstrong (Armaflex), Manville, Owens Corning or Halstead Nomaco (insultube), with maximum K factor of 0.27. Install as recommended by manufacturer. 2. Insulate standing seams with same thickness as duct. 3. Adhere insulation to duct and seal butt joints with full coverage of Armstrong 520 or approved equal adhesive. 4. Apply two coats of approved vinyl lacquer coating over woven glass yarn mesh adhered to insulation surface with Insulcolor or approved equal lagging adhesive.

I. Breeching Insulation

1. Do not insulate prefabricated, double wall breeching. 2. Cover boiler and water heater breeching and fittings with 2" of hydrous calcium silicate, high temperature pipe insulation, with staggered joints. 3. Insulation shall have minimum density of 11 lbs. per cu. ft. and maximum K value of 0.46 at mean temperature of 400°F. 4. Insulation shall be secured with ½" wide, 0.015" thick galvanized steel bands on 18" centers. 5. Point up joints with insulating cement. 6. Cover insulation with one inch galvanized hexagonal wire mesh and ½" thick insulating cement in two coats, troweled smooth. 7. 6 oz. canvas jacket shall be applied to all surfaces and shall be finished with one coat of adhesive. 8. Breeching insulation shall be Owens Corning, Kaylo 10, or Manville.

2.5 DIFFUSER SILENCERS

A. General

1. Furnish and install “D-Duct” Acoustic Diffuser style silencers of the types and sizes shown on the plans and/or as listed in the silencer schedule. Silencers shall be as manufactured by Industrial Acoustics Company. Any change in this specification must be submitted in writing to and approved by the Designer, in writing, at least 10 days prior to the bid due date.

B. Materials

1. The rectangular jacket outer casing of the Diffuser Silencers shall be constructed from lock former quality Type #G-90 galvanized steel in the following minimum gauges based on the smallest diameter of the internal Diffuser cone:

Dia. Inches Min. Shell Diffuser Gauge Up to 35-1/2" 22 gauge 36" to 45" 18 gauge Greater than 45" 16 gauge

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2. The internal Diffuser cone shall be constructed from lock former quality Type #G-90 galvanized perforated steel in the following minimum gauges based on the smallest diameter of the Diffuser cone:

Dia. Inches Min. Shell Diffuser Gauge Up to 35-1/2" 22 gauge 36" to 55" 18 gauge Greater than 55" 16 gauge

3. Diffuser Silencers shall include an internal core of consistent diameter along the entire length in direction of airflow. The core diameter shall be selected based on the adjacent hub diameter or, in the case of C-frame mounted motors, the motor frame size for the respective fan system on which the Diffuser Silencer is installed. 4. The internal core shall be constructed from lock former quality type G-90 galvanized perforated steel in the same gauge as the internal Diffuser cone. The core shall be supported by a minimum of three welded radial attachment brackets installed on 120 degree angles to each other to provide uniform support.

C. Construction

1. Four inches long, 11 gauge, sleeved end connections shall be provided as standard. When noted, rolled angle flanges shall be factory welded to the sleeve. 2. For units where the minimum Diffuser cone diameter is 36" or greater, an additional support rod shall be welded between the radial bracket and the sleeve to prevent a twist from being exerted on the internal core by the fan's air flow. 3. All welds shall be touched-up with zinc-rich paint after fabrication by the manufacturer. 4. The internal core and the rectangular outer jacket of the Diffuser Silencers shall be filled with glass fiber of a density sufficient to obtain the specified acoustic performance. The fill shall be packed under not less than 5% compression to eliminate voids due to vibration or settling. The fill material shall be inert, vermin and moisture proof.

D. Acoustic Performance

1. All silencer ratings shall be determined in a duct-to-reverberant room test facility which provides for airflow through the test silencer in accordance with applicable portions of test standard ASTM E-477. The test set-up and procedure shall be such that all effects due to end reflection, directivity, flanking transmission, standing waves and test chamber sound absorption are eliminated. Acoustic ratings shall include Dynamic Insertion Loss (DIL) with airflow of at least 2000 fpm entering face velocity. 2. Diffuser Silencers shall function as pressure regain devices to minimize system pressure losses at the fan. Fan selections are based on the regain performance of the Diffuser Silencer configurations specified. Any deviations in configuration which adversely affect the fan performance efficiency will not be accepted. 3. Silencers shall not fail structurally when exposed to a differential air pressure of 8 inches water gauge inside to outside the casing.

E. Combustion Ratings

1. Combustion ratings for the silencer acoustic fill shall be not greater than the following when tested in accordance with ASTM E 84, NFPA standard 255 or U.L. #723:

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a. Flamespread Classification: 20 b. Smoke Development Rating: 20

F. Certifications

1. With submittals, the manufacturer shall supply certified dimensional data and acoustic data for Dynamic Insertion Loss. All data shall be for a standard product. All rating tests shall have been conducted in the same facility, shall utilize the same silencer and such facility shall be open to inspection upon request from the Designer.

2.6 PIPING AND FITTINGS

A. General:

1. Pipe materials and fitting materials shall be as indicated in Schedule of Pipe and Fitting Materials.

B. Schedule of Pipe and Pipe Fitting Materials:

SERVICE SYSTEMS PIPE PIPE JOINTS FITTING FITTING DESCRIP- SIZE MATERIAL MATERIA RATING TION L PSI/CLASS / WEIGHT Hot Water HWS/R 2" and Copper, Soldered Wrought Class 150 under B88, Type L 95/5 Tin/ copper, Chilled CHWS/R or Antimony B16.22 Water Steel A53, Threaded Malleable Class 150 Condenser CWS/R Grade B, Smls Iron, B16.3 Water or ERW, Schedule 40

2-1/2" Steel A53 Butt Wrought Standard and Grade B, Smls Welded Steel, A234 Weight over or ERW or Grade WPB Schedule 40 Standard Mechanica Or l grooved piping Ductile iron system grooved end fittings Fuel Oil FOS/R 2" and Copper, Soldered Wrought Class 150 (Inside) under B88, Type L 95/5 Tin/ copper, or Antimony B16.22 Equipment Drains D Steel A53, Threaded Malleable Class 150 Grade B, Smls Iron, B16.3 Chemical CF or ERW, Feed Schedule 40

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SERVICE SYSTEMS PIPE PIPE JOINTS FITTING FITTING DESCRIP- SIZE MATERIAL MATERIA RATING TION L PSI/CLASS / WEIGHT

2-1/2" Butt Wrought Standard and Steel A53 Welded Steel, A234 Weight over Grade B, Smls Grade WPB or ERW Schedule Standard Condensate CD All PVC, Solvent PVC, Class 150 Drain Schedule 40 Welded Schedule 40 Note 1 Cold Water CW All Copper, B88, Soldered Wrought Class 150 Type L 95/5 Tin Copper, Antimony B16.22 Refrigerant R All Copper, ACR Silver Wrought 200 PSI Brazed Copper Vents V All Galv. Stl., A53 Threaded Galv. Class 150 or A120, Smls Malleable or ERW, Sched- Iron, B16.3 ule 40 HP Steam HPS 2" and Steel, A53, Socket Forged Class 3000 (Greater than under Grade B, Smls Welded steel, A105, 100 psig) or ERW, Sched- Grade B, ule 80 Class II, B16.11

2-1/2" Butt Standard and Steel, A53, Welded Wrought Weight over Grade B, Smls Steel or ERW, A234 GR Schedule WPB Standard MP Steam MPS 2" and Steel, A53, Threaded Malleable Class 300 (15-100 psig) under Grade B, Smls Iron, B16.3 or ERW, Schedule 80 2-1/2" Butt Wrought Standard and Steel, A53, Welded Steel, A239 Weight over Grade B, Smls Grade WPB or ERW, Schedule Standard LP Steam LPS 2" and Steel, A53, Threaded Malleable Class 150 (Under 15 under Grade B, Smls Iron, B16.3 psig) or ERW, Schedule 40

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SERVICE SYSTEMS PIPE PIPE JOINTS FITTING FITTING DESCRIP- SIZE MATERIAL MATERIA RATING TION L PSI/CLASS / WEIGHT 2-1/2" Butt Wrought Standard and Steel, A53, Welded Steel, A234 Weight over Grade B, Smls Grade WPB or ERW, Schedule Standard HP Steam HPC 2" and Steel, A53, Socket Forged Class 3000 Condensate under Grade B, Smls Welded Steel, A105 or ERW, Grade B, Boiler Schedule 80 Class II, Blowdown BD B16.11 (Greater than 100 psig)

Boiler BFW 2-1/2" Butt Extra S- Feedwater and Steel, A53, Welded Wrought trong W- (Greater than over Grade B, Smls Steel, A234 eight 100 psig) or ERW, Grade WPB Schedule Extra Strong MP Steam MPC 2" and Steel, A53, Threaded Malleable Class 300 Condensate under Grade B, Smls Iron B16.3 or ERW, LP Steam LPC Schedule 80 Condensate 2-1/2" Butt Wrought Extra S- Pumped PC and Steel, A53, Welded Steel, A234 trong W- Condensate over Grade B, Smls Grade WPB eight or ERW, Boiler BD Schedule Extra Blowdown Strong (under 100 psig)

Boiler BFW Feedwater (under 100 psig) Emergency E All Steel, A53, Butt Wrought Standard Generator Grade B, Smls Welded Steel, A234 Weight Exhaust or ERW, Grade WPB Schedule Standard Note 2 Note 1: Use copper for drain lines in plenums and through fire rated walls. Copper tubing must be insulated for 12' from equipment.

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Note 2: #304 Stainless steel, standard weight shall be used for outdoor piping. Double wall, pre-insulated systems may be used in lieu of welded piping.

C. Connections:

1. Provide dielectric fittings at connections of dissimilar materials. 2. Provide eccentric reducing couplings to bring pipes flush on top for water service and flush on bottom for steam service. 3. Branch lines in welded piping shall be made with welding tees except that branch lines less than one half diameter of main may be made with Weld O Lets or Sock-O-Lets. 4. Nipples shall be same material, make and thickness as pipe with which they are used. Close nipples shall not be used. 5. Make piping connections 2 1/2" diameter and larger to valves and equipment with welding neck flanges, ANSI B16.5, pressure rating to match system, flat or raised face as required. 6. Make piping connections 2" dia. and smaller to valves and equipment with steel body, 300 psi brass seat unions on steel piping and with heavy semi flushed brass unions on copper tubing. 7. Fit flanged joints with Johns Manville or approved equal full face gaskets. Flanges shall be faced and drilled to ASA standards and fitted with semi finished hexagon machine bolts and nuts of proper number and size. 8. Make screw joints tight with Teflon (polytetrafluoroethylene) tape or litharge glycerin mixture applied to male threads. Use tapered threads. 9. Make fusion welded joints as required by ANSI B31.1. Make changes in direction of pipe with welded fittings only. Bevel connections before welding, mechanically or by flame cutting.

D. Emergency Generator Exhaust

1. Provide emergency generator exhaust muffler and flanged flexible connections. 2. Provide exhaust piping as specified, as shown on Drawings and as required by applicable codes and standards. Provide 90°long radius sweep elbows as necessary. 3. Provide stainless steel piping for outdoor piping.

E. Cathodic Protection

1. Provide a system of cathodic protection to protect all underground steel fuel oil piping. It shall be the contractor’s responsibility to secure the services of a NACE certified, registered professional engineer in the field of corrosion protection to design and detail specific requirements of the project. 2. Products and requirements for the protection system shall be as set forth by the corrosion engineer. Installation of system shall be as required by corrosion engineer in accordance with equipment manufacturer's published installation instructions, and with recognized industry practices. 3. Cathodic protection product submittal shall be stamped with the seal of corrosion engineer and signed by him. Submittals shall include but not be limited to: construction details of cable connections to piping and other field connections, test station details, methods of coating and wrapping pipes, complete wiring diagram of system and maintenance instructions. Provide site plan showing runs of piping to be protected, test station locations and sacrificial anode locations.

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F. Grooved Piping Systems

1. Paragraph titles, service designation references, listings, descriptions, instructions, etc. in following paragraphs shall be used as a guide in establishing materials and performance standards. This shall in no way limit provisions of Contract Documents, nor change, reduce or limit Contractor's responsibility to comply fully with provisions of Contract Documents. 2. Pipe, used with grooved fittings, shall be Schedule 40 steel, or as specified in the "Piping" paragraph.

G. Products

1. Grooved Piping a. Grooved couplings may be used in lieu of welding, threaded or flanging on 2" and over carbon steel pipe, on water services from 30 F. to 250 F. within the manufacturer's rated working pressures. Pipe grooving shall be cut grooved and/or rolled grooved as per manufacturer's latest recommendations. 2. Piping Components a. Grooved couplings shall consist of two pieces of ductile iron. Coupling gaskets will be a synthetic rubber gasket with a central cavity pressure responsive design. Coupling bolts and nuts shall be heat treated carbon steel, trackhead conforming to physical properties of ASTM A 183. All grooved couplings shall be manufactured by Victaulic Co. Style 177, 77, and W77 flexible type or 107H, 07, and W07 rigid type or approved equal by Grinnell or Anvil Gruvlok. Flexible couplings may be used with the Designer’s approval as outlined in the Pipe Hanging paragraph. b. Victaulic or approved equal by Grinnell or Anvil Gruvlok flexible couplings may be used in lieu of flexible connectors for vibration isolation at equipment connections. Three (3) couplings, for each connector, shall be placed in close proximity to the vibration source. 3. Branch Connections a. For piping 2 1/2" and larger, full size branch connections shall be made with manufactured grooved end tees. Branch connections for less than full size shall be made with Victaulic hole cut or approved equal by Grinnell or Anvil Gruvlok. Branch connections with locating collar engaging into hole or outlet coupling used to join grooved pipe and to create a branch connection. 4. Gaskets a. All gaskets shall be Victaulic Grade “EHP” or equal EPDM compound with working temperature of -30°F to 250°F (8” and smaller) and Grade "E" or equal EPDM compound with working temperature of 30°F to 230°F (10” and larger). 5. Flanges a. Flanges shall be Vic Flange Style 741 and W741 (2 24") or equal for connection to ANSI class 125 and 150 flanged components, or Vic Flange Style 743 or equal (2" 12") for connection to class 300 flanged components. 6. Fittings a. Fittings shall be full flow cast fittings, steel fittings or segmentally welded fittings with grooves or shoulders designed to accept grooved end couplings. b. Standard Fittings shall be cast of ductile iron conforming to ASTM A 536 (Grade 65 45 12), painted with a rust inhibiting modified vinyl alkyd enamel or hot dip galvanized to ASTM A 153 or zinc electroplated to ASTM B 633, as required. c. Standard Steel Elbow Fittings (14" 24") shall be forged steel conforming to ASTM A 106 Grade B (0.375" wall ) or as-cast ductile iron, painted with rust

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inhibiting modified vinyl alkyd enamel or hot dip galvanized to ASTM A 153, with AGS grooved ends. d. Standard Segmentally Welded Fittings shall be factory fabricated, by fitting manufacturer, of carbon steel pipe as follows: 3/4" 4" conforming to ASTM A 53, Type F;5" 6" Sch. 40 conforming to ASTM A 53, Type E or S, Grade B; 8" 12" Sch. 30 conforming to ASTM A 53, Type E or S, Grade B; 14" 24" O.375" wall conforming to ASTM A 53, Type E or S, Grade B, painted with rust inhibiting modified vinyl alkyd enamel or hot dip galvanized to ASTM A 153, as required. 7. Valves, Strainers, Suction Diffusers a. Vic 300 MasterSeal™ (2” – 12”) grooved end butterfly valve or equal may be used for all services up to and including 300 PSI. Valve body shall be ductile iron with grooved ends designed to accept grooved mechanical couplings. Valves shall have an offset ductile iron disc core Disc seal (EPDM) shall be rated for service up to 250°F. b. Vic 300 AGS (14” – 24”) grooved end butterfly valve or equal may be used for all services up to and including 300 PSI. Valve body shall be ductile iron with AGS wedge-shaped grooved ends designed to accept Victaulic “W” series couplings or approved equal. Valves shall have a PPS coated ductile iron disc core and seat shall be PPS coated surface. Rated for service up to 230°F. c. Ball Valves shall be Vic Ball style 726 or equal Ball Valves, designed for 800 PSI (WOG) bubble tight working pressure. d. Check Valves Single Disc (2” to 3”), non-slamming, spring-loaded check valves with a plated nickel seat, ductile iron body, stainless steel disc designed for 365 PSI. Installed in the vertical and horizontal positions. Victaulic Series 716H or approved equal. e. Check Valves Single Disc (4” to 12”), non-slamming, spring loaded check valves with a welded in nickel seat. Ductile iron body and disc designed for 300 PSI. Installed in the vertical and horizontal positions. Style 716, 779. f. Check Valves Dual Disc Design (14” to 24”), spring loaded check valves with EPDM seat bonded to the valve body. Ductile iron body and stainless steel disc designed for 230 PSI. Installed in the vertical and horizontal positions. Victaulic Series W715 or approved equal. g. Strainer shall be Victaulic Style 732 or approved equal and W732 Wye Pattern Strainer for easy access and cleaning with grooved ends for installation in vertical down flow or horizontal flow position. h. Tee Pattern Strainer shall be Victaulic Style 730 and W730 or approved equal for easy access and cleaning with grooved ends for installation in vertical down flow or horizontal flow position. i. Suction Diffuser shall be Victaulic Style 731 and W731 or approved equal. Ductile iron body conforming to ASTM A 536. Diffuser stainless steel type 304 frame and perforated sheet with 3/16" diameter holes. 8. Expansion Fittings and Loops a. All piping shall be installed as to avoid strain or distortion from expansion and contraction. Expansion and contraction in grooved piping systems shall be accommodated with loops or bends consisting of (8) Victaulic or approved equal flexible couplings, (4) 90 degree elbows, and (3) grooved end pipe spools, provided in water systems up to 250 deg F, in accordance with Victaulic or approved equal recommendations for expansion compensation. b. Install in-line expansion joints in water piping systems that are installed in enclosures where pipe bends or loops cannot be applied.

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1) 2” through 6” Sizes: Packless, gasketed, slip-type expansion joint with grooved end telescoping body for installation with Style 07 rigid couplings providing up to 3” axial end movement and working pressures up to 350 psi. Victaulic Style 150 Mover® or approved equal. 2) ¾” and Larger Sizes: Combination of grooved end short nipples and Victaulic or approved equal flexible couplings joined in tandem to provide increased expansion. Joint movement and expansion capabilities determined by number of couplings/nipples used in the joint. Pressure rating dependent on size and style of flexible couplings used. Victaulic Style 155 or approved equal. 9. Hanging and Installation a. All grooved components installed and requirements for hanging, supporting, anchoring, expansion and contraction shall be in accordance with the latest published manufacturer’s instructions. b. Pressure and temperature ratings shall be as shown in manufacturer's latest published literature for individual style of coupling and gasket. Pressure and temperature ranges for valves shall conform to those in valves paragraph in Part Two of this specification. c. Grooved Pipe Hanging: 1) Rigid piping systems, using Style 107H, 07 Zero Flex or W07 couplings or equal, shall be supported as shown on drawings, as called for in Part Two of these specifications and as called for by the ASME Building Services Piping Standard B 31.9. 2) Piping systems using Style 177,77, W77 other flexible Victaulic couplings or equal may be used if explicitly approved by Designer. The contractor shall submit a schematic piping diagram to the Designer. The diagram shall show all points of anchorage, where flexible type couplings are used and where rigid couplings are used. The diagram shall show expansion joints (if any). d. Grooved Piping Installation:

H. Assemble joints with coupling and gasket, lubricant, and bolts. Cut or roll grooves in ends of pipe based on pipe and coupling manufacturer's written instructions for pipe wall thickness. Use grooved-end fittings and rigid or flexible, where required, grooved-end-pipe couplings. The gasket style and elastomeric material (grade) shall be verified as suitable for the intended service as specified. Gaskets shall be molded and produced by the grooved coupling manufacturer. Grooved end shall be clean and free from indentations, projections, and roll marks in the area from pipe end to groove. A Victaulic or approved equal factory trained field representative shall provide on-site training for contractor's field personnel in the use of grooving tools, application of groove, and installation of grooved piping products. Factory trained representative shall periodically review the product installation. Contractor shall remove and replace any improperly installed products.

2.7 PREINSULATED PIPING

A. Provide preinsulated piping by Pittsburgh Corning (Pittcon), Ricwil or Perma pipe for underground (hot) (chilled) water (steam) (condensate) service where shown on Drawings, with thermosetting fibrous glass reinforced plastic (FRP) outer casing, glass foam insulation as specified in Piping Insulation Paragraph, and steel carrier pipe as specified for applicable service in Piping Paragraph. Pipe shall be 40 ft. straight sections without fittings.

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B. Installation and testing of all components of underground piping system shall be in strict accordance with manufacturers best recommended practice. Give the Designer and Engineer 48 hr. notice prior to commencing installation of piping. A field engineer, employed by the piping system manufacturer, shall be on site during the entire time that the installation takes place. At the completion of the installation the manufacturer of the system shall deliver a letter to the Designer, stating that the piping system has been installed in accordance with manufacturer's directions, and that a factory employed engineer was on site during the entire time that the installation and testing took place, and that the installation and testing conforms to manufacturers recommended practice. The Construction Manager shall also deliver a letter to the Designer stating that the installation of the piping system was made in accordance with the instructions of the manufacturer. Both letters shall be signed by an officer of the respective company.

C. Provide structural insulating cement support guides on 10 ft. centers. Guides shall be 1" wide and same diameter as pipe. Install as recommended by manufacturer.

D. Provide oval, prefabricated expansion ells with oval support guides incorporated in ells.

E. Provide steel plate anchors welded to carrier pipe and bonded to FRP casing. Plate shall be 3/8" for pipe sizes through 6", ½" for 8 through 16" pipe and 3/4" for 18 through 30" pipe. Provide holes in anchors between carrier and casing, for drain and vent. Pour concrete thrust blocks at anchors as recommended by manufacturer.

F. Provide compressible silicon rubber, adjustable gland seals between carrier and casing, suitable for 4500 degrees F.

G. Provide ½" NPS vent and drain connections on vertical center lines of casing where pipe terminates inside building or manhole wall, at least 3" inside wall.

H. Provide FRP leak plate fusion welded to casing, protruding 3" beyond outside casing diameter, where pipe penetrates building wall, as close as possible to center of wall.

I. Provide polyester resin end seals welded to outside casing and bonded to carrier to seal insulation terminations

J. Provide steel head plates welded to carrier pipe and to steel sleeve of same size as casing, at anchors within 5 ft. of piping terminal ends. Casing shall be wound on and bonded to steel sleeve. Weld drain and vent connections to sleeve.

2.8 VALVES AND STRAINERS

A. Valves on condenser water, chilled water, hot water and fuel oil services shall be 125 psi unless noted otherwise. Pressure ratings of valves for steam and condensate services shall be as specified. Provide balancing valves where shown on Drawings.

B. Valves shall have name of manufacturer and guaranteed working pressure cast or stamped on bodies. Valves of similar type shall be by single manufacturer. Provide chain operators for valves 7 feet and higher above floor.

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C. Provide butterfly valves for shutoff on chilled, hot and condenser water services 2 1/2" and larger. Do not use butterfly valves for balancing service.

1. Valves shall be rated 175 psi maximum working pressure, iron body, threaded lug with resilient EPDM seats, bronze disc and 416 stainless stem, by Centerline, DeZurik, Keystone, or Bray. 2. Valves 6" and larger shall have gear or chain operators. 3. Valves smaller than 6" shall have seven position lever or chain operators. 4. Test valves at 110% of rated pressure.

D. Provide bronze body ball valves with reinforced teflon seats, seals, bearings and packing. Ball valves shall be used for chilled, hot and condenser water services in sizes 2" and smaller. Do not use ball valves for balancing service. Valves on insulated piping shall have 2" extended stems. Valves shall be by Apollo, Cannon, Nibco, Milwaukee, or Watts. Valves shall be rated 600 psi wog.

E. Provide globe valves for balancing and throttling steam and medium pressure condensate services by Crane, Jenkins, Milwaukee, Stockham or Walworth as follows:

1. Valves 2 1/2" and larger shall be iron body, flanged ends, bronze mounted, outside screw and yoke, renewable seat. 2. Valves 2" and smaller shall be bronze body, screwed ends, bronze trim. 3. Valves shall be ANSI B16.5 rated for (150) (300) pound service.

F. Check valves sized 2 1/2" and larger shall be iron body, flanged ends, bronze mounted, swing pattern. Check valves 2" and smaller shall be bronze, screwed ends, swing pattern. Check valves for hot water, chilled water and condenser water pump discharge shall be spring loaded, silent check, by APCO, Milwaukee, Mueller or Stockham.

G. Relief valves shall be brass with external lever, ASME approved. Pipe discharge to floor drain with open connection at floor. Pipe chiller refrigerant relief devices through roof to atmosphere.

H. Provide gate valves for shut off on steam and steam condensate services by Crane, Jenkins, Milwaukee, Stockham or Walworth as follows:

1. 125 psi steam working pressure valves shall have iron bodies, and silicon brass stems. Valves 3" and smaller shall have solid bronze wedges, Valves larger than 3" shall have solid iron wedges with bronze face rings. Valves 2" and under shall be threaded, valves 2 1/2" and over shall be flanged. 2. 250 psi steam working pressure valves 2" and under shall be bronze body with silicon brass stems and solid bronze wedges. Valves shall have threaded connections. 250 psi SWP valves 2 1/2" and over shall be iron body, iron wedges with bronze face rings and have flanged connections. 3. Valve shall having rising stems. (Valves shall have non rising stems.) 4. Packing materials shall be non asbestos.

I. Strainers

1. Strainers 2" and smaller shall be 250 lb. bronze body, stainless steel, screen with 20 mesh screen opening, Y pattern, screwed ends, Sarco Type BT, Mueller, Watts or Armstrong.

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2. Strainers 2 1/2" and larger shall be 125 lb., cast iron body, stainless steel screen with manufacturer's recommended screen openings, Y pattern, flanged, Sarco Type AF 125 or equivalent by Mueller, Watts or Armstrong. 3. Provide blow off valve on each strainer. 4. Pump suction strainers 2" and smaller shall have 0.062 screen openings. Pump suction strainers 2 1/2" and larger shall have 0.125 screen openings. 5. Strainer gaskets shall not contain asbestos.

J. Provide threaded vacuum breakers with ball, spring, O ring flexible seat, and screen. Ball shall be 440 stainless steel; seat shall be EPR. Spring shall be 316 stainless steel; screen and cap shall be 304 stainless steel and threaded collar shall be 416 stainless steel. Body shall be brass. Vacuum breakers shall be Johnson Series VB8 size 1 1/4 IPS, or equivalent by Watts or ITT Hoffman.

K. Provide unions for threaded end valves to facilitate removal from pipe.

L. Automatic Flow Control Valves

1. Provide automatic pressure compensating flow control valves by Griswold, or Autoflow where indicated on the drawings. Valves shall have the capacities and pressure differential characteristics, as indicated, and conform to the following specifications. Valves 2" and smaller shall be threaded bronze valves 2-1/2" and larger shall be flanged iron or steel body. 2. Valves shall be factory set and shall automatically limit the rate of flow to required engineered capacity within +5% accuracy over an operating pressure differential of at least 14 times the minimum required for control. 3. The control mechanism of the valve shall consist of self contained, open chamber cartridge assembly with unobstructed flow passages that eliminate accumulation of particles and debris. All internal working parts shall be stainless steel or nickel plated brass. Body shall be ductile iron, cast iron or bronze. 4. The cartridge assembly shall consist of a spring loaded cup. The cup shall utilize the full available differential pressure across the valve to actuate the cup and, thereby, reduce friction and hysterisis and eliminate binding. 5. Valves shall be available in minimum of three pressure differential ranges, with the minimum range requiring less than 2 psig to control flow. Valve bodies shall be provided with inlet and outlet tappings suitable for connection of instruments for verification of flow rates and temperature and shall be marked to show direction of flow. Valve bodies shall be rated for use at not less than 150% of system designed operating pressures. 6. Certified performance data for the flow control valve, based on independent laboratory tests, supervised and witnessed by a registered professional engineer, shall be available. 7. All flow control valves shall be supplied by a single source responsibility. 8. Each automatic flow control valve shall be furnished with a valve kit consisting of 1/4" x 2" minimum size nipples, quick disconnect valves (to be located outside of insulation), and fittings suitable for use with the measuring instruments specified, as well as temperature. 9. Provide a metal identification tag, with chain, for each installed valve. The tag to be marked with zone identification, valve model number and rated flow in GPM. 10. Flow control valve shall be warranted for period of five years from date of start up. 11. Provide DCAMM with dual hose meter kit including pressure gauge with 4 1/2" dial, 3 way push button operated valve, 5' long dual connection hoses, dual shutoff and vent

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valves, dual special valves for connection to standard valve kit, flow conversion chart and carrying case.

M. Suction Diffusers

1. Suction diffuser/strainers shall have 200 psi cast iron body and stainless steel strainer with 5/32" perforations. Units shall include flanged connections, removable gasketed cover and straightening vanes. Diffusers shall be Taco, B&G or Mueller. 2. Provide 16 mesh start-up strainer. 3. Provide blow off tapping on bottom of unit. 4. Provide full size inlet and outlet.

N. Combination Balancing/Flow Measurement/Shut-off Valves

1. Valves shall be Y-pattern style with multi-turn hand wheel. 2. Valves shall be capable of being installed in any direction without affecting flow measurement and shall provide the following functions: a. Precise flow measurement. b. Precision flow balancing. c. Positive shut-of with no drip seat. d. 3/4" drain port suitable for hose bib fitting. (Sizes 2" and below.) 3. Valves shall have four, 360O adjustment turns (2" and below), eight, 360O adjustment turns (2-1/2" - 6"), twelve, 360O adjustment turns (8", 10"), and sixteen, 360° adjustment turns (12") and up to twenty-two, 360 adjustment turns (16”). Handwheels shall have digital indicators with hidden memory and tamper-proof setting features. 4. Valves 2" and below shall be non-ferrous, pressure die-cast, non-porous Ametal copper alloy, with soldered ends. Install Series 78U union port fitting and Series 78 strainer/ball valve combination to complete terminal hookup at coil outlet. 5. Valves 2-1/2" and over shall be ductile iron body with all other metal parts of non-ferrous copper alloy. End connections shall be flanged or grooved. 6. Pressure ratings shall be 300 psi for 2" and below and 250 psi for flanged and 350 psi for grooved ends on 2-1/2” and larger. 7. Each valve shall have pressure/temperature readout ports with EPDM seals and attached shut-off valves. 8. One, computerized hand-held, balancing meter shall be furnished to the DCAMM Project Manager. The Testing and Balancing Contractor shall utilize this instrument for his work. The meter shall include the following: a. Flow measurement direct in GPM. b. Differential pressure measurement. c. Temperature measurement. d. Automatic calibration. e. Automatic air purging. f. Extended data logging functions. 9. Balance valves 2" and under shall be Tour and Anderson Model STAS. Valves 2-1/2" and over shall be Tour and Anderson Models STAF-SG or STAG. The handheld meter shall be Tour and Anderson Model CBI with PCB data logging features. Balance valves manufactured by Armstrong or Victaulic or approved equal shall be considered equivalent.

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2.9 PIPE INSULATION

A. Insulation shall be fibrous glass insulation with factory applied fire retardant vapor barrier jacket with K factor of 0.21 at 75°F mean temperature: by Owens Corning, CertainTeed, Manville or Knauf, installed as required by manufacturer. ASTM E 84 fire hazard ratings shall be 25 flame spread, 50 smoke developed and 50 fuel contributed.

B. Apply insulation after systems have been tested, proved tight and approved by Designer. Remove dirt, scale, oil, rust and foreign matter prior to installation of insulation.

C. No leaks in vapor barrier or voids in insulation will be accepted.

D. Insulation and vapor barrier on piping which passes through walls or partitions shall pass continuously through sleeve, except that piping between floors and through fire walls or smoke partitions shall have space allowed for application of approved packing between sleeves and piping, to provide fire stop as required by NFPA. Seal ends to provide continuous vapor barrier where insulation is interrupted.

E. Insulate flexible connections to same thickness and with same material as adjoining pipe insulation.

F. Provide fibrous dual temperature insulation with factory applied vapor barrier jacket on steam, outdoor condenser water, outdoor drain and makeup, condensate, chilled water, drain, hot and cold water piping, unless noted otherwise.

G. Drain piping other than PVC piping and outdoor cooling tower drain piping shall have ½" thick insulation. Insulation thickness for indoor steam, steam condensate, chilled water, hot water and cold water piping shall be as follows:

TABLE A Insulation Thickness INSULATION FLUID CONDUCTIVITY TEMPERATU 1" & 1-1/4" 2-1/2" BTUH/IN/F.HR.SF RE LESS TO 2" TO 4" AT TEMP ºF PIPING SYSTEM RANGE, ºF TYPES

HEATING SYSTEMS Steam & Hot Water High press./temp. 351-450 2.5 2.5 3.0 0.32 @ 250º Med. press./temp. 251-350 2.0 2.5 2.5 0.29 @ 200º Low press./temp. 201-250 1.5 1.5 2.0 0.27 @ 150º Low temp. 141-200 1.5 1.5 1.5 0.25 @ 125º Low temp. 105-140 1.0 1.0 1.0 0.24 @ 100º

Steam Condensate Any 1.5 1.5 2.0 0.27 @ 150º (for feed water)

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COOLING SYSTEMS Chilled Water 40-55 0.5 0.75 1.0 0.23 @ 75 Refrigerant or brine Below 40 1.5 1.5 1.5 0.23 @ 75

Make-up Water - 1.0 1.0 1.0 0.23 @ 75 INSULATION FLUID CONDUCTIVITY TEMPERATU 8" AND BTUH/IN/F.HR.SF PIPING SYSTEM TYPES RE 5" TO 6" LARGER AT TEMP F RANGE, F HEATING SYSTEMS Steam & Hot Water High press./temp. 351-450 3.5 3.5 0.32 @ 250 Med. press./temp. 251-350 3.5 3.5 0.29 @ 200 Low press./temp. 201-250 2.0 3.5 0.27 @ 150 Low temp. 141-200 2.0 2.0 0.25 @ 125 Low temp. 105-140 1.5 1.5 0.24 @ 100

Steam Condensate Any 2.0 2.0 0.27 @ 150 (for feed water)

COOLING SYSTEMS

Chilled Water 40-55 1.0 1.0 0.23 @ 75 Refrigerant or Below 40 1.5 1.5 0.23 @ 75 brine

H. Insulation on steam relief lines and general below ground (not buried) steam and condensate piping of pressures greater than 10 psig shall be 11 lb./cu. ft. density, molded hydrous calcium silicate fastened with 16 gauge annealed wire on 18" centers. Exposed covering shall be finished with 8 oz. canvas jacket.

I. Insulation for prefabricated piping specified in Preinsulated Piping Paragraph shall be cellular glass of 1 1/2" thickness for chilled water and 2 1/2" for hot water, Foamglas by Pittsburgh Corning or approved equal, with maximum K factor of 0.35. Insulation shall meet applicable requirements of this Paragraph.

J. Provide longitudinal lap and 6" wide vapor barrier joint seal strips secured with approved adhesive.

K. Seal ends of pipe insulation and seal insulation to pipe with approved fire retardant vapor barrier, at flanges, valves and fittings and at intervals of no more than 21 feet on continuous runs of piping.

L. Secure covers on concealed pipe with metal bands at least 3/4" wide and no more than 18" apart, spaced to hold ends and centers of each section.

M. Insulation on outdoor piping shall be twice the thickness listed in Table A above, but not more than 4". Waterproof with 0.016" thick aluminum jacket with 2" transverse and longitudinal

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lapped seams oriented to shed water. Fill seams with weatherproof adhesive. Secure jacket with 1" wide aluminum draw bands on 12" centers.

N. Do not insulate indoor condenser water systems. Provide 2" insulation on outdoor condenser water piping, only if heat traced.

O. Outdoor Pipe Insulation and Water proofing

1. Provide 1" thick flexible unicellular elastomeric foam rubber tubing insulation by Armstrong (Armaflex), Manville, Owens Corning or Halstead/Nomaco (Insultube), with maximum K factor of 0.27. Install as recommended by manufacturer. 2. Insulate valves and fittings with same thickness insulation as duct using manufacturer's pre formed fitting and valve insulation or field fabricated covers made with manufacturer's templates. 3. Adhere insulation to duct and seal butt joints with full coverage of insulation manufacturers approved adhesive. 4. Apply two coats of finish material to insulation. 5. Apply two coats of approved vinyl lacquer coating over woven glass yarn mesh adhered to insulation surface with Insulcolor or approved equal lagging adhesive. 6. Provide cork or dowel supports and metal shields at pipe hangers and supports as recommended by manufacturer.

P. Insulation on Fittings, Valves and Flanges

1. Fittings, valves and flanges shall be insulated with pre cut, factory supplied fibrous glass, by CertainTeed, Knauf, Owens Corning or Manville. 2. Fittings, valves and flanges shall be insulated with same material and to same thickness as adjoining pipe insulation. 3. Pipe fittings shall be pre tested, clean and dry before insulation. 4. Installation of insulation on fittings shall be as follows, in order: a. Wrap insulation around fitting and tuck ends into fitting throat. b. Edges of adjacent insulation shall be tufted and tucked in, to fully insulate fitting to thickness of adjacent pipe insulation. Use two or more thicknesses if necessary. c. If two layers of insulation are used on fittings, wrap and secure first layer with twine before applying second layer. d. Top layer of insulation shall be covered with one piece, PVC, Zeston molded fitting cover. Secure cover with stainless steel tack fasteners inserted into jacket throat overlap seam. e. Tape joints with pressure sensitive vapor barrier tape; tape shall extend 2" on either side of joint. 5. Prior to taping of joints on chilled water lines, apply vapor barrier mastic (brushed on) to fitting cover, throat overlap and edges. Also apply vapor barrier mastic to pipe insulation jacket ends. 6. For strainers and other valves or fittings which need maintenance, provide preformed removable insulation section.

Q. Refrigeration Line Insulation

1. Suction lines, hot gas bypass lines, and outdoor liquid lines shall be insulated with 3/4" thick rigid closed cell foam insulation, Armstrong Rigid Armaflex, Manville, Owens Corning or Halstead/Nomaco (Insultube), except in computer room plena.

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2. Installation shall meet manufacturer's recommendations. Seal butt joints with insulation manufacturers approved adhesive. 3. Outside above ground insulation shall be protected with two coats of approved vinyl lacquer coating over woven glass mesh adhered to insulation with Insulcolor or approved equal lagging adhesive, as recommended by manufacturer. 4. Refrigerant piping in hung ceiling and underfloor supply and return plena shall be insulated with 1" thick fibrous glass insulation that meets applicable requirements of this Paragraph.

R. Emergency Generator Exhaust

1. Insulate interior emergency generator exhaust piping, fittings and muffler with two 1" layers of calcium silicate with staggered joints. Secure with ½" wide 0.015" thick stainless steel bands on 12" centers. Do not insulate exterior exhaust piping unless necessary for personnel protection or unless indicated. 2. Insulation shall be rated for maximum operating temperature of 1200°F. Point up joints with insulating cement. 3. Cover insulation with 0.016" aluminum jacket. 4. Do not insulate prefabricated, double wall exhaust systems.

2.10 PIPE HANGERS AND SUPPORTS

A. Provide pipe stands, supports, hangers and other supporting devices in accordance with ANSI B31.9 and MSS-69, as necessary to support work required by Contract Documents.

B. Secure vertical piping to building construction to prevent sagging or swinging.

C. Space hangers for horizontal piping as follows:

Pipe Size Rod Diameter Maximum Spacing

Up to 1 1/4" 3/8" 8 ft. 0" 1 1/2 and 2" 3/8" 10 ft. 0" 2 1/2 and 3" ½" 10 ft. 0" 4 and 5" 5/8" 12 ft. 0" 6" 3/4" 12 ft. 0" 8" and over 7/8" 12 ft. 0"

D. Horizontal copper tubing shall have maximum hanger spacing of 5 ft. for tubing 1 1/4" dia. and smaller and 10' for tubing 1 1/2" and larger. Maximum spacing for PVC pipe hangers shall be 4'.

E. Reduce spacing to a maximum of 10' - 0" apart, regardless of pipe size, as necessary for fittings, valves and other concentrated loads.

F. Support piping 4" dia. and larger from structure with pipe roll hangers with adjustable steel rod hangers, sized to accommodate insulation.

G. Support piping 3" dia. and under from structure with Carpenter and Patterson Fig. 100 clevis hangers or approved equal.

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H. Hangers shall be by Carpenter and Patterson, F & S, or Grinnell Co. Figure numbers of Carpenter and Patterson are specified to establish standards of quality for performance and materials.

I. Provide spring hangers with travel stops as specified in Vibration Isolation Paragraph where necessary and where shown on Drawings.

J. Pipe supports for 4" and larger pipe and insulated high temperature piping shall have welded inserts of equal thickness to insulation to prevent compression of insulation. Other insulated pipe shall have 12", 14 GA shields at hangers, composed of 180°coverage of galvanized sheet metal and high density, pre formed, rigid insulation. Where rollers are required, shield shall be steel pipe.

K. Hangers for horizontal lines shall be vertically adjustable to obtain pitch requirements of Piping Paragraph.

2.11 SLEEVES AND PENETRATIONS

A. Pipe Sleeves

1. Sleeves through floors and through exterior, structural and fire rated construction shall be hot dipped galvanized Schedule 40 steel pipe. 2. Sleeves through partitions and non fire rated construction shall be 26 gauge galvanized steel with lock longitudinal seams, or approved plastic pipe. 3. Provide waterproofing membrane locking devices at floors. Provide 150 lb. slip on welding flanges at exterior wall penetrations.

B. Duct Sleeves and Openings

1. Sleeves through floors, through exterior structure, through fire rated construction and through smoke partitions that require smoke dampers shall be Schedule 40 galvanized steel pipe for round duct and shall meet SMACNA Fire Damper and Heat Stop Guide for rectangular and flat oval ducts. Fireproof packing shall be applied to seal any openings between sleeve and wall. Materials shall maintain the fire rating of the wall, and shall be installed in accordance with the SMACNA Fire Damper and Heat Stop Guide. 2. Openings in walls, partitions and other fire rated construction that do not require smoke dampers shall meet NFPA 90A, Section 3 3.8. 3. Materials for prepared openings in partitions shall match construction penetrated.

C. Pipe Sleeve Packing

1. Packing between the pipe and the sleeve (or wall or slab opening) in fire rated walls or slabs shall be a combination of fireproof insulation and fireproof caulk. The combination of materials shall have the same fire rating, in hours, as the wall or slab, as tested in accordance with the latest edition of ASTME 814 (UL 1479). The combination of materials shall be classified by UL, (fill, void or cavity materials) for the fire rating required and shall be listed as a numbered system in the UL Fire Resistance Directory. Fiberglass shall not be used as the insulation material. 2. Acceptable fireproof insulation materials shall be: Kaolin (Kaowool by Babcock and Wilcox); ceramic fiber blanket (Fiberfrax by Standard Oil) or fire rated mineral wool

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(Thermafiber by USG). Acceptable fireproof caulks shall be: Silicone ( by Dow Corning, Hilti CS240); ceramic fiber (Fyreputty by Standard Oil) or intumescent synthetic elastomer (Fire Barrier Caulk by 3M, Hilti CS2420). 3. Packing for sleeves that do not require maintenance of fire rating shall be oakum, silicate foam, ceramic fibre or mineral fibre with approved sealant. Pack or foam to within 1" of both wall surfaces. Seal penetration packing with approved caulking and paintable water proof mastic surface finish or silicone caulking. 4. All materials must be installed in accordance with manufacturers instructions; all gaps must be sealed. Finish caulk flush with wall or slab surface if piping runs exposed.

D. Other Water proof Pipe Penetrations

1. Modular mechanical penetration seals shall be interlocking synthetic rubber links shaped to fill annular space continuously, with galvanized carbon steel bolts, nuts and pressure plates to expand rubber seal between pipe and sleeve. Sleeve seal shall be water tight. 2. Prefabricated modular sleeves shall be Mason Industries (SWS) or approved equal stiffened galvanized steel sleeves with preformed closed cell elastomeric seal (non fire rated) or preformed mineral fiber or silicone foam seal (fire rated). 3. Provide water proof 1" single ring set in silicone and bolted to floor or wall at chipped and drilled penetrations of existing slabs on grade and existing walls below grade.

2.12 ESCUTCHEONS AND DUCT COLLARS

A. Provide adjustable escutcheons on exposed piping that passes through finished floors, walls and ceilings. Escutcheons shall be chromium plated cast brass, sized to cover sleeve opening and to accommodate pipe and insulation.

B. Provide 4" wide 20 gauge galvanized sheet metal collars at sleeves and prepared openings, sized to cover entire duct penetration including sleeve and seal, and to accommodate duct and insulation as necessary. Edges shall have milled lips ground smooth. Paint to match finish of duct or as directed by Designer.

C. Provide #316 stainless steel/No. 4 finish collar for emergency generator exhaust piping which passes through exterior wall.

2.13 WATER SPECIALTIES

A. Provide water specialties by Spirotherm, Bell & Gossett, Taco or Amtrol as follows.

1. ASME constructed, approved and stamped diaphragm with replaceable diaphragm of capacity shown on Drawings designed and tested for maximum allowable working pressure of 125 psi in accordance with ASME code for unfired pressure vessels. Expansion tank shall be factory charged as required for system. 2. Furnish and install at all high points and as indicated, air release valves on the hot and/or chilled water systems. Valves shall be equal to Spirotop "Quick Air Release". All valves shall be cast brass, rated for 150 psig design pressure and 270°F operating temperature. Units to include non-ferrous floats, stainless steel linkage and a Viton seal which closes against a brass spring operated seat. Alternate units shall be high capacity cast iron type

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with brass shut-off valve if using other than Viton, spring operated type air release. Alternates must be rated for 150 psig working pressure and 250°F operating temperature. 3. Furnish and install as shown on the drawings an air separator for the hot water , chilled water system and condenser water system. All separators shall be fabricated steel, rated for 150 psig design pressure and be selected for less than 1 foot of water pressure drop and velocity not to exceed 4 feet per second through the unit at specified GPM. Performance curves from the unit manufacturer shall be furnished as part of the submittal for each unit. Spirovent units to include internal copper coalescing medium to facilitate maximum air elimination and suppress turbulence. Alternate units shall be furnished with galvanized steel strainer and stainless steel collector tube for a similar purpose. Provide integral high capacity float actuated air vent at top fitting of tank. Alternates must include cast iron float actuated air vent rated at 150 psig which shall be threaded to the top of the fitting. Unit shall have bottom blow down connection.

2.14 EQUIPMENT INSULATION

A. General

1. Apply insulation after systems have been tested, proved tight and approved by Designer. Remove dirt, scale, oil, rust and foreign matter prior to installation of insulation. 2. No leaks in vapor barrier or voids in insulation will be accepted. 3. Insulation shall be CertainTeed, Knauf, Manville or Owens Corning and shall be installed in strict accordance with manufacturer's recommendations. 4. Insulate the following equipment: a. Chiller (Unless Factory Insulated) b. Hot and chilled water storage tanks c. Heat exchangers d. Expansion tanks e. Air separators f. Drain pans g. Duct mounted coils h. Pumps i. Surge and flash tanks 5. Insulation shall be 1" thick fibrous glass rigid block or semirigid board rated for temperature intended. Insulation shall be formed or fabricated to fit equipment. Ensure tight fit. Bevel edges and butt and stagger joints.

B. Secure with bands or wires at intervals recommended by manufacturer, no more than 12" centers. Provide corner angles.

C. Set cellular glass insulation and seal joints with bedding compound. Fill mineral fiber joints with insulating cement.

D. Apply two coats of adhesive with fibrous glass cloth embedded in first coat before application of second. Dry film thickness of finish shall be 1/8". Apply insulating cement over coated insulation; do not coat removable sections.

E. Equipment which needs servicing, such as pumps and plate heat exchangers shall be provided with removable insulation sections. Coordinate method of insulating plate with exchanger manufacturer.

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2.15 MOTORS, STARTERS AND WIRING

A. Provide motors and controls for HVAC equipment, except units served by MCC provided under Section 260001, ELECTRICAL WORK. Provide control and other related wiring including interlocks. Power wiring (to panelboards, disconnect switches, starters and motors) will be provided under Section 260001, ELECTRICAL WORK. Starters that are not integral to equipment will be furnished, installed and wired under Section 260001, ELECTRICAL WORK.

B. Unless otherwise specified, motors shall be NEMA Design B, constant speed, self ventilated squirrel cage induction. Motors shall have 1.15 service factor unless totally enclosed. Motors shall have Class B insulation.

1. Motors under 1/2 hp, shall be designed for 120 V, 60 Hz, single phase, unless otherwise specified. 2. Motors ½ hp and over shall be as required in schedules.

C. All motors shall be high or premium efficiency type. They shall conform to NEMA Standard MG 1 12.53a and shall have their efficiencies determined in accordance with IEEE Standard 112 Method B. The NEMA nominal efficiency shall be listed on the motor nameplate. Minimum nominal efficiencies shall be as follows:

Size (HP) Nominal Efficiency (Min.) 1 – 3 84% 5 - 7 1/2 88.5% 10 - 25 90% 30 - 100 93% 100+ 95%

D. Starters furnished integral to equipment, and that require interlocks or remote control shall be magnetic with HAND OFF AUTOMATIC switch in cover. Provide magnetic starters as necessary, with auxiliary contacts, buttons and switches in required configurations. Refer to paragraph AUTOMATIC TEMPERATURE CONTROLS and to Control Drawings for interlock requirements.

1. Each 3 phase, 60 Hz motor shall be provided with magnetic starter with either ON OFF push button or hand off automatic switch. 2. Other motors shall be provided with a manual starter with ON OFF switch. 3. Control relay for each starter shall be for operation on 120 V, single phase, and transformer of sufficient capacity within starter case shall be furnished for this purpose. 4. Provide inverse time limit overload and under voltage protection in each leg and with pilot lights. Provide red and green On Off pilot lights. 5. Provide nameplates with engraved white lettering to designate area and equipment served. 6. Starters for refrigeration machines shall be furnished by unit manufacturer. 7. Provide starters for two speed motors with deceleration relay. 8. Furnish for all single speed motors, 25 hp and above, 95% power factor correction capacitors. Capacitors shall be in NEMA enclosure of the same rating as the motor's starter.

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2.16 VARIABLE FREQUENCY DRIVES

A. The VFD shall be furnished and installed by the electrical contractor and as specified in Section 260001, ELECTRICAL WORK.

B. Variable speed drives shall be installed on:

2.17 CENTRIFUGAL PUMPS

A. General Requirements

1. Provide, where shown on drawings, centrifugal pumps, of capacities types and configurations shown on schedules. Acceptable manufacturers shall be: a. *Armstrong b. *Bell and Gossett c. *Gould d. *Taco 2. Provided that they meet the requirements of this specification and the performance requirements shown on the schedules (with equal or less horsepower requirement than the pump shown on the schedules). Pumps, other than the scheduled model, may also be rejected, which operate in an inappropriate portion of their performance curves, including but not limited to, operating in the rightmost third of the curve. 3. Pumps shall be designed specifically for intended classes of service, with non overloading characteristics throughout the design curve (motors shall not operate in their service factor). Impeller shall be statically and dynamically balanced. Impeller size shall be no more than 90 % of casing size. Pump shall be factory tested at operating conditions, thoroughly cleaned, and painted with one coat of machinery enamel prior to shipment. Installation instructions shall be included with pump at time of shipment. 4. Coordinate with manufacturer of water treatment to ensure that normal life of pumps and components shall not be foreshortened by water treatment. 5. Provide cyclone type abrasive separators to provide clean water flush to seals for all pumps on open systems, and all pumps over 3HP on closed systems requiring flush. Separator materials and pressure ratings shall be suitable for intended class of service and maximum working pressure of the pump. Provide sheet metal guard to protect separator tubing from damage do not use poly tubing for separator. Provide shut off cocks with manual valved bypass line to allow separator to be removed for cleaning while seals continue to be flushed. 6. Provide, under the work of the mechanical section, flexible connections (if shown on details) and vibration isolation components for all pumps. See the vibration isolation paragraph of these specifications for specific requirements. 7. Provide steel channel base for each pump. 8. Motors shall be high efficiency type, see motor and starter paragraph of these specifications for requirements.

B. Pump Types and Materials of Construction

1. General: a. For all types of pumps listed below, bearing frame and pump internals shall be serviceable without disturbing motor or connected piping.

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b. For all types of pumps listed below, provide mechanical seals with carbon rings and ceramic faces, stainless or brass metal parts, stainless springs and synthetic rubber bellows. Seals shall operate satisfactorily to 225°. c. Unless otherwise stated in the schedules, all pumps shall be single stage. d. Provide tappings for pressure gauges at inlet and discharge of all in line and split case pumps. e. All couplings for variable speed pumps shall be capable of operating under all conditions without fatigue. 2. Double Suction Split Case Pumps: a. Double suction pumps shall have horizontally or vertically split casings. Materials of construction shall be for a bronze fitted pump including cast iron casings, bronze shaft sleeves, alloy steel shafts and bronze, enclosed double suction impeller. Provide regreasable ball bearings, casing wear rings, drains and vents, coupling guards and steel baseplate. Stainless steel shaft with no sleeve may be substituted for shaft components named above, at manufacturers option. 3. End Suction Pumps a. End suction pumps shall be based mounted, horizontally coupled with vertically split cases. Materials of construction shall be for a bronze fitted pump including cast iron casings, bronze shaft sleeves, alloy steel shafts and bronze enclosed impellers. Provide regreasable or permanently lubricated ball bearings, casing wear rings, drains and vents, coupling guards and steel baseplate. 4. In Line Pumps a. In Line pumps shall have bronze fitted construction, including cast iron casings, bronze or copper shaft sleeves, alloy steel shafts and bronze impellers. Bearings shall be either be sleeve type or regreasable ball bearings. Provide casing wear rings, drain and vent connections and flexible coupling or direct drive connection between pump and motor. If the scheduled pump includes ball bearings and a direct drive motor to impeller connection, the submitted pump shall not have sleeve bearings or a flexible coupling between pump and motor.

2.18 DUPLEX CONDENSATE PUMP SET

A. Provide 212°F, 2 feet NPSH duplex condensate pump set by ITT Domestic, Roth, or Skidmore, as shown on Drawings. Pump set shall consist of:

1. receiver, 2. inlet strainer, 3. water pumps, 4. float switches, and 5. controls and accessories.

B. Receiver shall be close grained cast iron and elevated from pump set. Provide externally adjustable two pole float switches, water level gauge, dial thermometer, discharge pressure gauges, bronze isolation valves between pumps and receiver, and lifting eye bolts.

C. Inlet strainer shall be cast iron with removable vertical bronze screen and dirt pocket. Mount on receiver.

D. Pumps shall be 212°F rated, 2 feet NPSH, vertical, bronze fitted, flange mounted and permanently aligned. Pump shall have stainless steel shaft, enclosed bronze impeller,

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renewable bronze case ring and mechanical shaft seal. Pumps shall be close coupled to vertical drip proof motor. Capacities, hp, rpm, electrical and other characteristics shall be as scheduled on Drawings.

E. Provide and wire controls as follows in NEMA 2 panel with hinged door and grounding lug:

1. two combination magnetic starters with three overload relays apiece, with circuit breakers and panel cover interlock; 2. electrical alternator; 3. Automatic Off switches; 4. momentary contact test pushbutton; 5. numbered wiring terminal strip; 6. fusible control circuit transformer for each circuit; and, 7. removable mounting plate.

F. Pump control circuits shall be separate. Alternator shall change pump operating sequence automatically after each cycle and cause simultaneous pump operation upon peak load. Backup pump shall operate automatically upon failure of lead pump or control.

G. Factory wiring shall be numbered. Set shall be assembled and factory tested as unit.

2.19 DUPLEX BOILER FEED PUMP UNIT

A. Provide duplex boiler feed unit by ITT Domestic, Roth, or Skidmore that consists of boiler feed receiver, boiler feed pumps, water make up assembly, and UL listed control cabinet mounted on pump.

B. Condensate receiver shall be horizontal welded steel on steel frame and with networking capacity as shown on Drawings.

C. Provide inlet cascade baffle on receiver. Receiver heads shall be convex.

D. Provide water level gauge and angle thermometer.

E. Water make up assembly on receiver shall be sized to capacity of one boiler feed pump. Assembly shall consist of level control switch and packless piston, pilot operated solenoid electric valve with strainer.

F. Pumps shall be centrifugal, permanently aligned and factory assembled on steel frame, including pipe, fittings and shut off valve between each pump and receiver.

G. Pumps shall be bronze fitted mechanical seal with enclosed bronze centrifugal impeller, renewable bronze wearing rings, stainless steel shaft and drip proof motor.

H. Provide factory wired NEMA 2 control cabinet with hinged door and grounding lug. Cabinet shall contain:

1. combination magnetic starter for each pump with three overload relays with circuit breaker and cover interlock; 2. selector switch for each pump;

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3. momentary contract test pushbuttons; 4. circuit breaker for control circuit with cover interlock; 5. numbered wiring terminal block; 6. removable mounting plate; and 7. fusible control circuit transformer for each circuit when the motor voltage exceeds 130 V.

I. Provide control components necessary to provide sequence of operation on Control Drawings.

J. Provide McDonnell Miller No. 150 pump control for each boiler for mounting on the boiler.

K. Provide and install low water burner cut off and alarm switch in accordance with local codes.

L. Factory test assembled pump set. Furnish elementary and connection wiring diagrams, piping diagrams, installation and operation instructions.

2.20 BOILER STEEL FIRE TUBE

A. Provide (gas) (oil) (dual fuel) fired, (steam) (hot water) boiler/burner package where indicated on Drawings, with trim and controls, as required by manufacturer's instructions and in compliance with rules and regulations of authorities that have jurisdiction, by PVI Industries, Inc., Kewanee, Superior or Burnham Steel. Certify that boiler efficiency is *83% combustion efficiency oil fired or 80% combustion efficiency gas fired. Boiler shall meet ASME boiler and pressure vessel code for ( psi hot water) ( psi steam).

1. *Reference: Appliance Energy Policy Act requirements for boilers above 300,000 BTU/Hr. input.

B. Provide wet back 100% submerged combustion horizontal fire tube boiler. Boiler shall be factory-assembled with heavy steel base frame, integral burner, controls, boiler trim, and shall bear UL label. The use of refractory in the construction of the boiler will not be permitted.

1. Boiler shall meet requirements of ASME Boiler and Pressure Vessel Code, Section IV for Low Pressure Heating Boilers. 2. Provide inspection and clean out openings and manhole, as required by the ASME Boiler and Pressure Vessel Code. 3. Front and rear tube sheets and shall be fully accessible for inspection and cleaning form the front end of the boiler only. 4. Provide observation ports for inspection of flame conditions at each end of boiler. 5. The entire water side of the boiler shall be accessible by removing the heat exchanger or through a rear access or both. 6. Provide stack thermometer in exhaust gas vent. 7. Provide heavy density fiberglass insulation and preformed sheet metal jacketing. Jacketing shall be individual segmented panels. Metal thickness shall be recommended by boiler manufacturer. 8. Boiler, base frame and components shall have hard enamel finish and shall be suitable for mounting on concrete pad provided under Section 033000, CAST-IN-PLACE CONCRETE.

C. Boiler Trim for Hot Water

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1. Provide probe type or float operated low water cutoff control on top of boiler. Manual reset when required by state and local codes. 2. Provide combination pressure and temperature gauges on boiler. Temperature sensing element shall be next to hot water outlet. 3. Provide pressure relief valves that meet ASME Code requirements. 4. Operating Temperature Control. 5. Manual reset high limit temperature control. 6. Modulating temperature control to regulate firing rate of burner to match load (optional). 7. Mount temperature controls on unit with temperature sensing elements next to hot water outlet. 8. Provide air vent tapping in shell.

D. Boiler Trim for Steam

1. Provide pressure gauge and ASME rated safety relief valves. 2. Provide water column with 3 tri-cocks, gauge glass and blowdown valves. 3. Provide manual reset low water cut off integral with water column to prevent burner restart automatically, on low-water condition. 4. Provide M&M #150 boiler feed pump control/primary. Low water cutoff with automatic reset. 5. Provide M&M #63M Aux. LWCO with manual reset. 6. Operating pressure controller to maintain steam pressure setting. 7. Manual reset limit pressure controller to prevent steam pressure form exceeding safe system pressure. 8. Modulating pressure control to regulate firing rate of burner to match load (optional). 9. Provide Hoffman #55 F&T for high water level spill. One (1) per boiler.

E. Oil Burner

1. Provide forced draft, integral, low pressure air atomizing burner for (on off) (high low) (modulating) combustion of No. 2 oil. Ignition shall be at low fire. Provide automatic maintenance of fuel to air ratio with flue gas at least 68°F hotter than outlet gas dew point. 2. Provide automatic electric ignition, air , lubrication system, oil level indicator, inlet oil filter and air pressure gauge. If a pressure-atomizing burner is furnished, an air compressor, lubricated system, and air pressure gauge are not required. 3. Provide balanced combustion air blower with inlet silencer and inlet air dampers. Blower shall be connected directly to motor. 4. Provide piping and integral pressure regulators, oil metering (modulating burners only) solenoid shut offs and oil strainer. 5. Provide 16 gauge galvanized steel drip pans under burners, at least 24" x 24" x 2" deep (not by manufacturer).

F. Gas Burner

1. Provide forced draft, integral, high radiant, annual entry, premix power burner for (on off) (low/high/low) (modulating) combustion of natural gas. Ignition shall be at low fire. 2. Provide gas train piping, pressure regulator and automatic gas electric ignition, as required by codes, standards and insurers. Gas train shall meet requirements of UL-795 and ASME CSD 1 safety code.

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3. Provide balanced combustion air blower with inlet silencer and inlet dampers. Blower shall be connected directly to motor.

G. Dual Fuel Burner

1. Provide forced draft, integral dual fuel burner for (on off) (low/high/low) (modulating) combustion of No. 2 oil and natural gas. Oil firing shall be pressure atomizing. Gas firing shall be high radiant, annular/entry, premix. Ignition shall be at low fire. 2. Provide automatic electric and electric gas pilots. 3. Provide gas train piping and pressure regulator, as required by codes, standards and insurers. Gas train shall meet requirements of UL-795, UL-296 and ASME CSD 1 safety code. 4. Provide balanced combustion air blower with inlet silencer and inlet air dampers. Blower shall be connected directly to motor. 5. Provide oil piping and integral pressure regulators, oil metering (modulating burners only), solenoid shut offs and oil strainer. 6. Provide 16 gauge galvanized steel drip pans under burners, at least 24" x 24" x 2" deep (not by boiler manufacturer).

H. Control Panel

1. Provide NEMA 1A lockable control panel with dust tight neoprene door seal. Provide controls as follow: a. Electronic micro-computer type primary control for start stop and pre and post combustion purges and to shut down burner upon ignition, pilot or main flame failure. b. Provide fused control circuit transformer when supply voltage is three phase. c. Manual automatic selector switch and damper motor positioning switch shall be furnished on modulating burners. d. Electronic detector to prevent primary valves from opening until pilot flame is established. e. Indicating lights for low water, flame failure, fuel valve open, and load demand. Provide lead sulfide scanner for oil firing rates greater than 20.00 GPH. f. 4PDT oil gas selector switch, with center “off” position. 2. Provide lead lag control panel to sequence boiler firing automatically with changing load conditions. System shall stage and modulate burners in response to pressure/temperature variations. Provide operating controls in boiler header and all control wiring. Lead boiler shall be manually selectable by switch at panel. Lead lag control panel will be furnished for remote mounting by installing contractor.

I. Testing

1. The boiler will be hydro-tested to ASME requirements (one and one-half times design pressure) prior to shipping. 2. The complete boiler/burner package will be factory test fired t ensure proper operation of all controls and safety devices.

J. Venting

1. The boiler will be suitable for use with a listed vent materials when firing natural gas only.

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K. Start-Up

1. Start-up of the boiler will be performed by factory authorized personnel. Start-up documents will be provided to the DCAMM to verify all safety limits and combustion test.

L. Warranty

1. For a period of one year, the manufacturer will pay all material, labor, and freight charges necessary to repair any failed part of the boiler dUe to a manufacturer’s defect. For a period of five years, manufacturer will repair the boiler if it should leak due to thermal shock. See manufacturer’s standard warranty for limited conditions.

2.21 BOILER - CAST IRON SECTIONAL

A. Provide cast iron sectional, wet base, pressure fired Boiler/Burner unit for (low pressure steam) (forced hot water) heating service as manufactured by Burnham, Weil McLain or Smith Cast Iron Boilers, complete with Burner mounting plate; Insulated Metal Jacket; Burner mounted Control Panel; Boiler Trim and Instruments and (Oil) (Gas) (Gas/Oil) Burner.

B. Boiler/Burner unit shall be performance tested and certified by I=B=R. Boiler shall be designed and tested to meet the minimum efficiency requirements of 80% Combustion Efficiency for Natural Gas and 83% Combustion efficiency for No. 2 fuel oil as mandated by the National Energy Policy Act and ASHRAE-90.1

C. Boiler shall be constructed for (15 PSI steam working pressure) (50) (70) (80) PSI Maximum Water Working Pressure in accordance with the ASME Section IV Rules for Construction of Heating Boilers. Individual sections shall have been subjected to a hydrostatic pressure at the factory before shipment and they shall be marked, stamped or cast with the national Board Standard.

D. Set boiler foundations upon concrete pad furnished under Section 033000 - CAST-IN-PLACE CONCRETE.

E. For Oil fired or Gas/Oil fired Burners, provide 16 gauge steel raised lip drip pan of sufficient size to cover the area under the Burner, filter and piping. Provide approved absorbent material.

F. Boiler shall be furnished knocked down unit for field erection in strict accordance with the manufacturers instructions and recommendations. Boilers shall be installed utilizing acceptable ASME piping practices and requirements.

G. Provide trim and instruments as follows: (FOR STEAM)

1. ASME approved side outlet safety valve sized to exceed the Gross Output of the Boiler which shall be factory set in accordance with ASME Code. 2. Steam pressure gauge with siphon. Zero to 30 psi range with 1/4" gauge cock and inspector's test connection. 3. McDonnell & Miller #150 pump control/primary LWCO with automatic reset. 4. Gauge glass with the lower fitting provided with a drain cock of a type having an unrestricted drain opening of not less than 1/4" IPS to facilitate cleaning..

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5. McDonnell & Miller #63 M auxiliary low water cut off with manual reset. 6. Hoffman No. 55 high water overflow float trap, with pipe and fittings, one (1) per boiler. 7. The multiple steam pressure controls shall be mounted upon or fed from a manifold or they can be installed singly at separate tappings. If installed with a manifold, the control manifold and the common source connection to the Boiler shall be at least 3/4" inch IPS size. Each pressure control shall be protected with a siphon or equivalent means of maintaining a water seal that will prevent steam from entering the control. Steam pressure gauge shall be installed complete with Inspectors’ gauge cock and equipped in internal or external siphon. 8. High limit pressure control with manual reset switch. 9. Operating pressure control and firing rate control as required for the specified firing mode. (On-off) (low-high-low) (full modulation).

H. Provide trim and instruments as follows: (FOR HOT WATER)

1. Provide combination water pressure and temperature gauge, and ASME-rated pressure relief valve. 2. Provide automatic low water cut off with manual reset. 3. Provide electronic operating temperature controller. 4. Provide limit temperature controller to limit boiler water temperature. 5. Provide boiler air vent.

I. Oil Burner

1. Burner shall incorporate all the necessary devices and controls to provide a complete fuel combustion system which shall bear Underwriters Laboratories seal of approval. Boiler shall be furnished with a flame retention type pressure atomizing, forced draft burner arranged for (On-Off) (Low-High-Off) (Low-High-Low) (Full modulation) firing with Pre-Purge and Proven Low Fire Start. 2. Oil burner shall be equipped with a fuel unit driven off the blower motor shaft. Pump pressure shall be 300 PSI for easier ignition and better combustion at low input. Fuel unit shall have 2-stage pumping gears, self-contained pressure regulating valve and shall be suitable for 3450 RPM service with a suction vacuum of 15" inches of Mercury. Two (2) approved safety shutoff oil valves shall be provided integral to the Burner. 3. All Controls, motor starters, relays, switches and Pilot lights shall be installed within a Burner mounted control panel. External lights, switches and components shall all be wired to a numbered terminal strip without splices and the panel shall be complete with the following controls and devices: a. Electronic Micro-Computer type Primary Control equipped with LED sequence status lights. Provide a timed pre-Purge Cycle; Trial for Ignition; with 3 second Flame Failure response time with non-recycling safety shutdown upon loss of Main Flame at point of supervision and a post-Purge Cycle. b. Use for Full Modulation Burners: Manual/Automatic selector switch with manual potentiometer and SPST Burner Service Switch. Provide the following factory installed isolating load relays: 1) Alarm relay to initiate a remote alarm on Control Lockout. Relay to be wired to “BOILER OFF” alarm/strobe light located elsewhere in the building. 2) Combustion air damper relay. One (1) relay per Burner. c. Pilot Lights to indicate: 1) “Power On”

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2) “Main Fuel” 3) “Flame Failure” 4. Furnish and install an approved quality fuel oil filter for the Burner, Garber screw-in type, Model 11BV-MK with a flow handling capacity of not less than 90 GPH of oil filtering rate. Furnish and install a vacuum at the oil filter complete with a short nipple and gauge cock. 5. Furnish and install Webster OSV at pump suction as required by 527 CMR 4.00 and in accordance with the valve manufacturers recommendations and instructions. Furnish and install all new fusible link oil valves, swing check valves, thermal cutoff switches and emergency burner shutoff switches as required by previously specified State and Local Codes.

J. Gas Burner

1. Burner shall incorporate all the necessary devices and controls to make a complete fuel combustion system which shall bear Underwriters Laboratories seal of approval. Boiler shall be furnished with a flame retention type nozzlemix multi-port, forced draft burner arranged for (On-Off) (Low-High-Low) (Full modulation) firing with Pre-Purge and Proven Low Fire Start, Burner shall be listed by the Gas Regulatory Board. 2. Gas valve train shall be furnished in accordance with UL-795 requirements for Automatic Gas Fired Boilers, and shall comply fully with the Massachusetts Fuel Gas Code for Gas Utilization Equipment in Large Boilers including not less than the following: a. Separate Pilot and separate Main Gas pressure regulators. Each regulator shall be designed for operation with up to a Maximum of 28" inches W.C. inlet gas pressure. Vent as required by 248 CMR 7.02(11)(C). b. Pilot and Main manual shutoff gas cocks. Manual shutoff gas cock larger than 2" inches shall be of the lubricated plug or ball type with stops. c. Dual Safety Shutoff Gas Valves piped in series. An approved motor driven reset Safety Shutoff Gas Valve complete with actuator shall be provided in the Main gas line to the Burner. An approved Auxiliary solenoid gas valve shall be provided upstream from the motor driven reset valve. Combination Gas Valve/Pressure Regulator similar to V4843 shall not be considered acceptable. d. Optional - add for full modulation (butterfly type modulating combustion control valve, Leakage test cock and Pilot gas solenoid valve). e. One quarter inch (1/4") plugged tappings shall be provided, one of which shall be located upstream of the Main gas pressure regulator and another to be located near the Burner head to permit gas pressure readings with a Manometer. f. Gas pressure supervision shall be provided by listed pressure switches interlocked to accomplish a non-recycling safety shutdown in the event of High or Low gas pressure. Vent as required by 248 CMR 7.02(11)(Table 2) Gas Code. 3. Each Burner shall be furnished with a gas pilot of the pre-mix type with interruptible ignition and the Primary Control shall monitor the Main Flame so that the Main Fuel Valve cannot open until the Pilot Flame has been established and proven.

K. Dual fuel Burner

1. Burner shall incorporate all the necessary devices and controls to provide a complete fuel combustion system which shall bear Underwriters Laboratories seal of approval. Boiler shall be furnished with a flame retention type pressure atomizing, nozzlemix multi-port, forced draft burner arranged for (On-Off) (Low-High-Off) (Low-High-Low) (Full

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modulation) firing with Pre-Purge and Proven Low Fire Start. Burner shall be listed by the Gas Regulatory Board and approved by the State Fire Marshall. 2. Burner shall be furnished with a gas pilot of the pre-mix type with interruptible ignition when firing on Gas and Direct Spark ignition from a 12,000 Volt ignition transformer when firing on Oil. 3. Gas valve train shall be furnished in accordance with UL-795 requirements for Automatic Gas Fired Boilers, and shall comply fully with the Massachusetts Fuel Gas Code for Gas Utilization Equipment in Large Boilers including not less than the following: a. Separate Pilot and separate Main Gas pressure regulators. Each regulator shall be designed for operation with up to a Maximum of 28" inches W.C. inlet gas pressure. Vent as required by 248 CMR 7.02(11)(C). b. Pilot and Main manual shutoff gas cocks. Manual shutoff gas cock larger than 2" inches shall be of the lubricated plug or ball type with stops. c. An approved motor driven reset Safety Shutoff Gas Valve complete with actuator shall be provided in the Main gas line to the Burner. An approved Auxiliary solenoid gas valve shall be provided upstream from the motor driven reset valve. Combination Gas Valve/Pressure Regulator similar to V4843 shall not be considered acceptable. d. Leakage test cock and Pilot gas solenoid valve and Butterfly type firing rate control valve. e. One quarter inch (1/4") plugged tappings shall be provided, one of which shall be located upstream of the Main gas pressure regulator and another to be located near the Burner head to permit gas pressure readings with a Manometer. f. Gas pressure supervision shall be provided by listed pressure switches interlocked to accomplish a non-recycling safety shutdown in the event of High or Low gas pressure. Vent as required by 248 CMR 7.02(11)(Table 2) Gas Code. 4. Gas valve train components shall be furnished as specified above with the Pilot Gas train, and combustion air dampers and linkage installed and wired in the factory. All other components shall be furnished loose for field assembly. Gas valve train assembly shall be sized for minimum acceptable pressure drop with a minimum gas pressure of ((______)) inches W.C. at the inlet to the Main Gas pressure regulator. 5. All Main gas and Pilot gas pressure regulators and High and Low gas pressure switches are to be independently vented to a safe outdoor location in with 248 CMR 7.02(11)(C). Vent lines shall be of steel or wrought iron pipe, 3/4" inch IPS minimum and with a maximum length as directed by 248CMR 7.02(11)(Table 2), which shall discharge to outside atmosphere. Pilot gas pressure regulators shall also be vented in accordance with 248 CMR 7.02(11)(C), unless constructed or equipped to limit the escape of gas from the vent opening in the vent of diaphragm failure to not more than 2.5 cubic feet per hour. Vent lines from regulators shall not be connected into a common line with the bleed line from gas operated diaphragm valves or from pressure relief valves. 6. Oil burner shall be equipped with a fuel unit driven off the blower motor shaft. Pump pressure shall be 300 PSI for easier ignition and better combustion at low input. Fuel unit shall have 2-stage pumping gears, self-contained pressure regulating valve and shall be suitable for 3450 RPM service with a suction vacuum of 15" inches of Mercury. Two (2) approved safety shutoff oil valves shall be provided integral to the Burner. 7. Furnish and install an approved quality fuel oil filter for the Burner, Garber screw-in type, Model 11BV-MK with a flow handling capacity of not less than 90 GPH of oil filtering rate. Furnish and install a vacuum gauge at the oil filter complete with a short nipple, snubber and gauge cock. 8. Fuel oil lines shall be manufactured utilizing flared fittings only and teflon tape shall not be an approved pipe thread sealant. Any other type of piping or sealant not specifically

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recommended by the Burner manufacturer shall not be considered acceptable. All new oil supply lines in direct contact with concrete or earth shall be enclosed with a continuous non-metallic sleeve that extends out of the concrete or earth a minimum of four (4") inches on each end. 9. Furnish and install Webster OSV at pump suction as required by 527 CMR 4.00 and in accordance with the valve manufacturers recommendations and instructions. Furnish and install all new fusible link of oil valves, swing check valves, thermal cutoff switches and emergency burner shutoff switches as required by previously specified State and Local Codes.

L. Control Panel

1. All Controls, motor starters, relays, switches and Pilot lights shall be installed within a Burner mounted control panel built to meet or exceed NEMA-1 standards. External lights, switches and components shall all be wired to a numbered terminal strip without splices and the panel shall be complete with the following controls and devices: a. Electronic Micro-Computer type Primary Control equipped with sequence status lights. Provide a timed Trial for Pilot; timed Trial for Main Flame with 4 second Flame Failure response time with non-recycling safety shutdown upon loss of Main Flame at point of supervision. Provide Pre and Post Purge cycles. b. For full modulation, provide Manual/Automatic selector switch with manual potentiometer, and 4PDT Fuel Changeover Switch with center “Off” position. Provide the following factory installed isolating relays: 1) Alarm Relay to initiate a remote alarm on Control Lockout. One (1) relay per Burner. To initiate “BOILER OFF” alarm/light elsewhere in the building and specified under another portion of this Contract. 2) Combustion air damper relay. One (1) per Burner. c. Pilot Lights to indicate: 1) “Power On” 2) “Main Fuel” 3) “Flame Failure” a) Burner shall be furnished with a gas pilot of the pre-mix typ with interruptible ignition when firing on Gas and Direct Spark ignition from a 12,000 Volt ignition transformer when firing on Oil. b) Burner shall always return to the Low Fire position for ignition and a combustion air proving switch shall be mounted on the Burner interlocked to close the Main Fuel Valve in the event of a loss of combustion air. c) (Lead/Lag control system to control the On/Off setpoint and the modulation band of the Burners. The setpoints of the two (2) SPST controls shall be adjusted so as steam pressure drops, first the Lead Burner will be called to fire, then as pressure drops further, the second Burner will be called to fire. The bandwidth of the two modulating type controls are set so that lead Burner will modulate to High Fire (or close to High Fire) before the Lag Burner is called to fire, and the Lag Burner will modulate when the Lag Burner is called to Fire. The Lead Burner selector switch shall allow selection of either Burner No.1 or No. 2 as Lead. Furnish and install two wire and three wire steam pressure controls for header installation. d) (Boiler flue canopy shall be constructed of aluminized steel and shall be concealed under the insulated metal jacket. Flue connector shall

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be 14" inch Dia. Top outlet, securely fastened and sealed to the canopy and shall utilize a fixed baffle in the flue collar and shall be equipped with a pressure test tapping. e) (If double acting barometric dampers are installed, thermal spill switches shall be integrated into the Burner circuit, wired to shut the Burner down in the event of flue gas spillage from the barometric damper exceeding 60 seconds duration.

M. Control Wiring

1. Provide electrical burner control wiring in rigid conduit, as required by burner manufacturer's recommendations and in accordance with the wiring diagrams. All safety control switching shall be accomplished in the hot ungrounded conductor in accordance with State and Local Codes. All wiring for Boiler and Burner shall be rated for the maximum operating temperature to which it may be exposed. All wiring between components shall have copper conductors not less than 18 AWG and constructed in accordance with the NEC/NFPA 70. 2. An electrical thermal switch fused to break the ungrounded conductor in the main circuit at 165° shall be installed in the main power line within six feet over the top of the Burner. If the ceiling above the Burner exceeds 12 ft. in height, an additional thermal switch shall be installed on the ceiling and series connected with the lower switch. Fuse protection for the control circuit shall be provided. A manually operated remote heating plant shutdown switch shall be furnished and installed just outside the Boiler room door and shall be marked for easy identification. If there is more than one (1) Boiler room door, there shall be a switch located at each door. Shutdown switch(es) must be wired to disconnect all power to the Boiler controls. 3. Control wiring shall include, but shall not be limited to, connections to: a. Limit switches: high, operating controls and modulating burner. b. Low water cutoff and pump controller. c. Emergency shutoff switch. d. Stack temperature thermocouple sensor in breeching. e. Lead lag system operating controls in main steam header. f. High and low oil pressure switches (when provided). g. Fresh air intake automatic control damper interlocked to each burner circuit. h. Provide fusible control circuit transformer. i. Coordinate with boiler sequence of operation.

N. An authorized representative of the Boiler or Burner manufacturer shall perform the initial start- up, final adjusting and testing of the Burner and Controls in the presence of the Installing Contractor and the User Agency’s Operating Personnel.

2.22 BOILER - CAST IRON MODULAR

A. Type:

1. Provide Multiple Boiler(s) for forced hot water heating service arranged for automatic operation firing (Natural Gas) (LP Gas) fuel. Boiler(s) shall have been rated in accordance with A.G.A. and the Gas Appliance Manufacturers Association and Boiler Efficiency Certification Program and I=B=R as hereafter specified and shown on the Contract Drawings.

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B. Construction:

1. Boilers shall be manufactured of vertical cast iron sections which shall have been subjected to a hydrostatic pressure test of 125 PSI at the factory before assembly and each section shall be marked, stamped or cast with the ASME Code symbol. After section assembly, the entire block of sections shall be hydrostatically tested at 75 PSI prior to shipment. Boiler shall be designed in accordance with the ASME Boiler and Pressure Vessel Code requirements for 50 PSI Maximum allowable working pressure. 2. Each Boiler shall be furnished with a Factory assembled heavy gauge, aluminized steel base with high temperature insulating board. Provide aluminized burners with air shutters which feature smooth ignition and positive flame extinction. Burner manifold assembly shall be arranged for a manifold pressure 3.50" Ins. Water column. 3. Boiler shall be designed to operate at Zero draft as maintained by the integral drafthood. Provide a factory-wired motorized stack damper for each Boiler. All wiring to and from the automatic vent damper shall be protected from the flue pipe or any other high temperature heat source and precautions during installation shall be taken to allow for un- restricted differential expansion of the vent casting and the flue pipe so as to prevent shifting and binding of the damper under normal operation. Vent damper shall be installed in strict accordance with the Boiler manufacturers instructions and recommendations. 4. Boiler insulating metal jacket shall have 1 inch thick foil backed fiberglass insulation and shall have a rust resistant baked enamel finish. Boiler flue canopy shall be constructed of aluminized steel and shall be concealed under the insulated metal jacket. Flue connector shall be top outlet, securely fastened and sealed to the canopy. 5. Each Boiler shall be installed with isolation valves to allow any Boiler to be isolated for repair, or drained without emptying the entire system. A High Limit with manual reset and a Probe type Low water cutoff shall be installed in a supply riser off the top of each Boiler in accordance with the Manufacturers instructions and recommendations. Low water cutoff shall be UL and FM approved, time delay shall not be considered acceptable.

C. Individual Boiler trim shall include:

1. 24V Gas Valve Transformer. 2. Pressure/Altitude Gauge. 3. ASME schedule water relief valve set at 50 PSI. 4. L40800B High Limit. 5. L4006E High Limit with Manual Reset (1 per Boiler). 6. PS-851-M-120 Low water Cutoff with manual reset (1 per Boiler). 7. Boiler blowdown valve, brass, ball type, not less than 3/4" IPS.

D. Boiler Trim (Steam)

1. Provide pressure gauge, and ASME rated pressure relief valves. 2. Provide water column with cocks, gauge glass and blowdown valve. 3. Provide manual reset low water cut off integral with water column to prevent burner operation automatically. 4. Provide boiler condensate return pump automatic control, integral with water column.

E. Gas Controls

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1. Control system shall provide a 24 Volt intermittent Pilot ignition system complete with dual combination gas control providing manual shutoff gas cock, two (2) automatic operators, pressure regulation, Pilot filter and flow adjustment. Electronic ignition shall provide an electrically ignited intermittent gas pilot and shall permit the gas valve to open only when the Pilot is proven. Slow opening gas valve shall provide low fire start with smooth easy transition to high fire. Intermittent Pilot ignition system shall provide 100% shutoff characteristic. Should a loss of Pilot flame occurs, the Main Gas valve shall close and the spark will recur within 0.8 seconds. If the Pilot fails to ignite within 90 seconds, the control system will attempt to relight after 5 minutes. Hot surface ignition systems that do not prove the existence of a Pilot ignition prior to lighting the Main Flame shall not be considered acceptable to this installation.

F. Controls

1. Controls for boiler module shall be factory tested and shall be suitable for firing each module individually. Step firing of each battery shall be accomplished by firing individual boiler modules with signal from control panel. 2. Arrange controls so that one boiler module may be made inoperative and removed from system without interfering with normal operation of other boiler modules.

G. Provide supervisory services of manufacturer's field engineer for start up, testing and instruction of User Agency’s personnel.

2.23 BREECHING AND STACK (FIELD FABRICATED)

A. Provide breeching and stack system for boiler including but not limited to the following.

1. Ventilated roof thimble. 2. Roof support and flashing. 3. Storm collar. 4. Stack cap. 5. Headered connections of boilers to common breeching. 6. Sections of pipe necessary to extend stack beyond roof as required by applicable codes. 7. Tees and elbows as necessary. 8. Expansion joints.

B. System shall be welded, gas tight, 10 gauge black iron, properly supported, stiffened and reinforced. Flanges for bolted connections shall be welded to breeching.

C. Angle stiffeners shall be punched for covering; paint breeching one shop coat before erection and two coats of approved heat resisting paint after erection and before covering.

D. Provide for expansion and contraction of breeching.

E. Provide cast iron cleanout doors for tees and 90° elbow connections. Provide gas tight, cast iron door frames with approved latches.

F. Insulate breeching as specified in this Section.

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2.24 BREECHING AND STACK (PREFABRICATED)

A. Provide round all fuel rated air or fill insulated to limit skin temperature to 95°F, prefabricated double wall duct breeching for domestic water heaters and for boilers and other mechanical equipment that burn gas or oil, by Ampco, Metalvent, Metal Fab or Metalbestos.

B. This contractor shall coordinate with the plumbing subcontractor, to ensure that if a water heater using forced draft venting is submitted, a stack designed for positive pressure will also be submitted. Do not submit Type B gas vents for water heaters with forced draft burners.

C. Breeching shall be aluminized steel outer jacket and aluminum internal liner (for gas); stainless steel (for oil) with integral spacers or insulation.

D. Provide fire stop fittings at wall and ceiling penetrations.

E. Joints shall be vapor tight with locking groove slip joints with locking tabs and bands.

F. Provide high temperature expansion fittings between flue and structural penetrations.

G. Provide aluminized water tight insulated thimble, exit cone, supporting hardware, cleanouts, and drain sections.

H. System shall be Metalbestos Model PS, Metalfab, or Metalvent.

2.25 CHEMICAL TREATMENT - WATER SYSTEMS

A. Provide treatment systems and service for primary water systems. Do not operate systems without water treatment. Water treatment chemicals shall be by Barclay, Dearborn, Olin or Mogul. Pump and chemical drums shall be by the manufacturers of the chemicals or Liquid Metronics. Dearborn and Liquid Metronics model numbers are used to establish standards of quality.

B. Provide piping necessary for complete systems.

C. Water treatment shall include feeding devices necessary to feed chemical solution into piping system and bring chemical properties of water to within manufacturer's recommended operating limits, in order to minimize corrosion and reduce build up of slime or other contaminants.

D. Furnish and install a coupon rack capable of accepting six coupons in each chemically treated system. The chemical treatment contractor shall make recommendations as to the use of coupons and shall include the furnishing and analysis of the coupons/system (steel and copper) each month.

E. Closed loop systems (chilled water and heating hot water) shall have water treatment consisting of Dearborn Model Type AV By-Pass Shot Feeder, to feed chemical solution into each piping system. Chemicals shall be Dearborn B-524 (Nitride Corrosion Inhibitor) to maintain control limits at 800-1000 parts per million of sodium nitrite). Below 1000 gpm of system flow, a five gallon shot feeder shall be provided. From 1001 to 2500 gpm, provide a 50 gallon tank, pump set and agitator.

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F. Water treatment for open condenser water system shall consist of:

1. Equipment a. Provide one Hydac Modu-Max Control System, or equal by Uniloc, Lakewood or Great Lakes consisting of: 1) Control box enclosure, NEMA 12 cabinet, 20 amperes 115V with internal circuit breakers. 2) PH-TDS Conductivity Monitor and Control Module. 3) Flow-through type probe assembly with flow control shut-off; pressurized, prepiped and mounted. 4) Digital display read-out for conductivity and PH controller. 5) Electric contacting water meter. 6) Water meter totalizer. 7) Solenoid bleed valve, suitable for outdoor environment. 8) Counter timer control module for inhibitor feed. 9) Biocide programmable module - dual pumps. b. Water meter and solenoid bleed valve shall be sized as follows: Water Meter Solenoid Bleed Water Meter Gallons per System Capacity Valve Size Size Contact Less than 400 tons 3/4" 3/4" 10 401-900 tons 3/4" 1" 50 901-1500 tons 1" 1½" 100 1501-3000 tons 1½" 2" 100

c. Provide three (3) chemical metering pumps as follows: 1) System size under 900 tons, Liquid Metronics AISI-191S, 24 gpd, 110 psi. 2) System size above 900 tons: Liquid Metronics B111-95S, 30 gpd, 150 psi. 3) If local water conditions warrant, provide an additional caustic or acid pump, of capacities listed above. 2. Chemical a. Provide Dearborn C-381 cooling water inhibitor maintaining control limits of 100- 125 parts per million and pH of 8.0 to 8.5. b. Provide Dearborn A-100 and A-111 algaecides or provided equal.

G. Flush and clean all systems with Dearborn BC 45 cleaner after completion of installation. After cleaning, add Dearborn B-524 nitrite inhibitor to closed loop systems, to control nitrite strength to 800 1,000 ppm maximum. Submit written report indicating that systems have been thoroughly cleaned and charged with corrosion inhibitor.

H. Effluent from HVAC system discharged to sewer shall meet requirements of applicable local, state and national water quality standards.

I. One year service shall include, but not be limited to, the following:

1. Delivery and maintenance of water treatment chemicals for one year. 2. Collection and analysis of samples of circulating water every thirty days for one year, and adjustments to the rate of chemical feed to suit each system. 3. Inspection and maintenance chemical feeding devices for one year. Inspection and maintenance should be performed at minimum intervals of every thirty days.

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4. Water tests according to project requirements.

J. Mechanical contractor shall provide the steel support shelf for the chemical feed pumps.

K. Electrical Wiring and Controls Interlocking

1. Provide all necessary interlocking between solenoid bleed valve and respective conductivity controller. Provide power wiring for solenoid valves, pumps and controller.

L. Closed loop systems with glycol shall be filled to a 35% concentration of propylene glycol/water solution. An extra 55 gallon drum shall be provided to the DCAMM Project Manager.

2.26 CHEMICAL TREATMENT - STEAM SYSTEMS

A. Provide tank, duplex pumps, agitator, piping, feed system, controls and other appurtenances for steam treatment system. Dearborn, Liquid Metronics, and Neptune model numbers are used to establish a standard of quality.

1. Provide proportioning positive displacement piston pump with 6.5 gph capacity. Provide 1/3 hp, one phase, 60 Hz, 120 V, 1725 rpm, drip proof electric motor operating through flexible coupling to extra heavy duty gear reducer with at least 3/4" shaft and input hp rating that exceeds motor rating. Piston cross head shall be bearing bronze and connecting rod bearing shall be uniball with grease fittings. Pump packing shall be spring loaded and shall be set at factory. Stroke adjustment shall be manual, with micro screw adjustor. 2. Provide 50 gallon 12 gauge steel chemical feed tank with double welded seams. Pump platform shall be integral part of tank legs. Provide hinged cover, non valve gauge glass; cast iron strainer with 60 mesh reinforced PVC suction piping; and 316 stainless steel pressure relief valve with 50 500 psi range, piped to return with clear nylon reinforced PVC tubing. Tank shall be pre piped to pump suction side. Provide one cu. ft. perforated metal dissolving basket. 3. Provide Neptune Model A 1 chemical agitator with 1/4 hp, one phase, 115 V, 1725 rpm TEFC motor, cast iron clamp, steel coupling, stainless steel shaft and two 14 gauge stainless steel propellers. 4. Provide electrical interlock to start chemical feed pump when boiler feed pump starts.

B. Condensate Receiver - Treatment Feed System

1. Provide one Liquid Metronics A741-955 chemical feed pump. 2. Provide one Liquid Metronics programmable electric water meter model FP-07. 3. Provide one Liquid Metronics 30 gallon polyethylene tank, cover and agitator assembly.

C. Do not operate system without steam treatment.

D. Apply chemical cleaning operation to interior of systems to remove and dissolve foreign substances after completion of installation.

E. Premixed Boiler Treatment Chemicals

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1. Provide for alkalinity control - Dearborn B265. 2. Provide for oxygen-scavenging - Dearborn B266.

2.27 CHEMICAL TREATMENT - DIRECT INJECTED STEAM HUMIDIFICATION SYSTEMS

A. Boiler Water Feed System

1. Provide one Liquid Metronics A741-955 chemical feed pump. 2. Provide one Liquid Metronics programmable electric water meter Model FP-07. 3. Provide one Liquid Metronics 30 gallon polyethylene tank, cover and agitation assembly.

B. Provide all above, piping, wiring and other appurtenances for a complete operating and effective steam treatment system.

C. Provide electric interlock to enable chemical feed pump when boiler feed pump starts.

D. Do not operate system with steam treatment.

E. Flush and clean all systems with Dearborn BC-45 cleaner after installation is complete. Submit a written report indicating that systems have been thoroughly cleaned.

F. Premixed Boiler Treatment Chemicals

1. Provide Dearborn B269 for alkalinity control. 2. Provide Dearborn B273 for oxygen scavenging. 3. Steam treatment chemicals shall be USDA and FDA food grade approved.

G. Dearborn and Liquid Metronics are listed above to establish a minimum standard of quality.

2.28 PRESSURE GAUGES, THERMOMETERS AND TEST PLUGS

A. Provide bronze Bourdon tube pressure gauges where shown on Drawings and where specified, by U.S. Gauge, Trerice, or Weksler, accurate to +1%.

1. Gauges shall have white faces with black filled engraved lettering. Gauge bodies shall be set in phenolic cases. Provide siphons and shut off cocks. 2. Gauges shall be easily accessible and easily read. Gauges readable from floor at less than five feet shall have 4 1/2" dials. Other gauges shall have 6" dials. Gauges graduations shall meet limit requirements of normal operation. Gauge shall indicate at mid scale.

B. Provide separable well V case thermometers by U.S. Gauge, Trerice, or Weksler where shown on Drawings and where specified. Thermometers shall have 9" scale and white face with black filled engraved letters. Thermometers shall be angular or straight stemmed, as conditions necessitate. Thermometer wells shall be bronze and shall be installed so as to ensure minimum restriction of water flow in pipe.

1. Provide thermometer ahead of and beyond cooling coils, in pump suctions and discharges, and where shown on Drawings. Thermometers shall have scale range of 0° 120°F with 2°scale division.

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2. Provide thermometer in condenser water system at each chiller, cooling tower and pump connection. Scale range shall be 20° 180°F with 2°scale division. 3. Provide thermometer in hot water system at each boiler, coil and pump connection, unless specified otherwise. Scale range shall be 30° 300°F with 2°scale division. 4. Provide additional thermometers where shown on Drawings.

C. Combination Pressure/Temperature Test Plugs

1. Provide in the supply and return piping at VAV boxes, duct coils, unit ventilators, and fan coil units, combination pressure temperature test plugs by Peterson Equipment Company "Petes Plug" or Sisco, Inc. "P/T Plugs". 2. Plug shall be 1/4" or 1/2" NPT, constructed of solid brass with a Nordel valve core suitable for temperatures up to 350°F. Plug shall be rated zero leakage from vacuum to 1000 psig. 3. Provide extension fitting for each plug suitable for use with 2" maximum pipe insulation. 4. Provide gauge test kit consisting of the following items: a. (2) 3-1/2" dial face gauges 0 100 psi and 0 231 feet. b. (2) Gauge adapters with 1/8" O.D. probe. c. (2) 5" stem pocket testing thermometers ranges 25 125°F; 0 220°F. d. (1) Carrying case. e. (2) 4' length of flexible hose with adapters.

2.29 FLOW ELEMENTS

A. Provide primary flow measuring elements and sensors in (chilled water) (and) (condenser water) systems and where shown on Drawings.

B. Provide 1/2" steel weld coupling, welded to pipe. Sensor shall be 316 stainless steel.

C. Install elements as required by manufacturer.

D. Provide portable differential pressure meter of same manufacture as element. Scale shall be zero base, linear to DP with 6" meter.

E. Elements shall be Dietrich Standard Corp. Annubar Model GCR as recommended by manufacturer or equivalent by Preso.

F. Provide pressure meter by Dietrich Standard, or Preso with zero base scale, linear to DP with 6" meter. Flow element readings shall not be more than 75% nor less than 25% of meter scale.

2.30 STEAM METER

A. Provide electronic steam metering at medium pressure reducing station to measure steam flow within 1.0% accuracy over 20 to 1 flow range. Provide for recording steam pressure, steam flow rate and integrator for total flow. Install as recommended by manufacturer's recommendations.

B. Provide components as follows:

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1. Dp transmitters a. 4-20 mA output b. +0.5% span accuracy c. 1/4" NPT process connections d. cast iron body e. 316 s.s. wetted parts f. 500 psig static pressure minimum g. 2" pipe yoke mounting h. withstand 250°F process temperature at capsule 1) NEMA 3 enclosure 2. Square root extractors a. +0.5% span accuracy b. 2" pipe yoke mounting c. NEMA 3 enclosure 3. Scaler a. +0.5% accuracy b. 2" pipe yoke mounting c. NEMA 3 enclosure 4. Recorder/Totalizer a. seven day electric drive 12" circular chart 1) two pen recorders b. surface mounted c. brass pneumatic receiver bellows with 3 15 psi input for steam rate recorder d. 316 stainless steel spiral pressure receiving element with 0 100 psi range e. linear eight digit non reset integrator, case mounted 5. Orifice flanges a. carbon steel of size shown on Drawings b. weld neck c. ANSI Class 300 6. Orifice plate a. flange mounted b. 316 stainless steel c. ANSI Class 300 d. bored calculations by supplier

C. Components shall be by single manufacturer: Foxboro, Bailey or approved equal.

2.31 BTU METERS

A. Provide electronic Btu meters by Kent or approved equal in locations and of sizes shown on Drawings.

B. Recovered condensate meter shall be designed for minimum temperature range of 40°F to 225°F.

C. Chilled water meter shall be designed for minimum range of 32°F to 120°F.

D. Control panel shall have read outs for BTU's and total gallons.

E. Counters shall be non resettable and shall retain readings if power to unit is interrupted.

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F. System shall operate with as little as 1°F temperature difference, and as much as 170°F temperature difference, between two thermistor sensors, accurate to 97% or more over entire range.

2.32 STEAM PRESSURE REDUCING VALVES

A. Provide steam pressure reducing valves shown on Drawings, complying with pressure ranges, capacities and application arrangement.

B. Valves shall be single seat, pilot or diaphragm operated, and shall have cast iron bodies and approved stainless steel seats and trimmings.

C. Valve parts shall be accessible for service without removal from line.

D. Provide three valve bypasses of capacity and range shown on Drawings. Each pressure reducing valve shall be provided with Y type strainer and blow down valve on strainer.

E. Valves shall be by Spence, Leslie, Fisher or Sarco.

2.33 STEAM TRAPS

A. Provide traps by Armstrong, ITT Hoffman, Sarco or Velan where required and where shown on Drawings.

B. Continuous float and thermostatic traps shall have stainless steel floats, bronze fittings and integral thermostatic air bypasses. Bodies and covers shall be of stainless steel or cast iron. Working parts of each trap shall be accessible by removing cover without necessitating disconnection from pipe.

C. Inverted bucket traps shall be cast iron with stainless steel bucket and heat treated chrome steel valve and seat.

D. Thermostatic traps shall have brass bodies and caps with natural brass finish. Bellows, valve head and renewable valve seat shall be stainless steel.

2.34 FILTERS MEDIUM EFFICIENCY, THROW AWAY TYPE

A. Do not operate systems without design filters. Provide new filters before balancing. Provide spare set of filters.

B. Provide dry type gauge, with scale of 0 to 2" across filter. Gauge shall include appropriate static pressure tips, vent valves and tubing. Gauge shall be suitably marked to indicate when filter should be changed, and shall be Dwyer Magnahelic Type or approved equal.

C. Filters shall be Farr, Cambridge or AAF, as scheduled on Drawings. Filters shall be listed by Underwriters Laboratories, Class 2.

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D. Holding frames for filters shall be 16 gauge galvanized steel with polyurethane foam gaskets and fasteners. Frame shall be Farr, Type 8, or equivalent by other named manufacturers.

2.35 CHARCOAL FILTERS FOR RADIOACTIVE APPLICATIONS

A. Provide duct mounted charcoal filter and housing by Charcoal Service Corp., Flanders or Barneby Cheney for radioactive hoods.

B. Provide all welded stainless steel, industrial grade, side access, gasketed housing suitable for radioactive fume hood application, for at least 6" static pressure.

C. Provide Farr 30/30 or approved equal, 24" x 24", 2" thick, 30% prefilter.

D. Provide charcoal filter V type bed with 99.9% efficiency for iodine, rated 100 cfm at 1.45" water column.

E. Provide static pressure caps at inlets and outlet of filters.

2.36 HIGH EFFICIENCY PARTICULATE AIR (HEPA) FILTER ASSEMBLIES

A. Provide Farr Magna/Pack HEPA, side access, factory assembled, filter housing or equivalent by AAF, Cambridge or Flanders where shown on Drawings.

B. Assembly shall consist of housing, two removable access doors, filter mounting grid and swing bolts with equi bearing clamps and hex nuts, and shall withstand 8" wg pressure without leakage.

C. Housing shall be 14 gauge galvanized steel reinforced with bracing, with standing flanges for installation in duct work.

D. Unit shall accommodate standard 24 x 24 Farr Magnamedia filters or equivalent by AAF, Cambridge or Flanders.

E. Access doors shall be 14 gauge galvanized steel reinforced with welded channels to remain rigid when exposed to 8" wg. Provide neoprene gaskets and heavy duty equi bearing clamps.

F. Provide welded mounting grids of 14 gauge galvanized channel steel, with four swing bolts for each filter module. Bolts shall be provided with equi bearing clamps and hex nuts. Mounting grid and swing bolts shall seal individual filters.

G. Provide dry air filter gauge, with a 0 2" scale across filter. Gauge shall have static pressure tips, vent valves, and tubing and shall be marked to indicate need to change filter. Gauge shall be Dwyer Magnahelic.

2.37 BAG FILTERS FOR MEDICAL AND OTHER STERILE FACILITIES

A. Prefilters shall be UL Class 1, 37" deep, fiberglass bag filters.

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B. Filters shall be Cambridge Filter Corp. HI FLO Aerosolve Series 2 or equivalent by AAF or Farr.

C. Filter element shall consist of tapered individual pleats, maintained in tapered form by flexible internal supports.

D. Pleat fastenings shall be sealed with thermoplastic fire retardant synthetic sealant.

E. Media restrainers shall be galvanized steel hoops fastened with clinch in galvanized steel cartridge frame.

F. Filter shall be designed to operate at 625 fpm. Initial pressure drop shall not exceed 0.20" of water at 500 fpm. Each 24" x 24" filter shall have net area of 96 sq. ft. with average efficiency of 65% by ASHRAE Standard 52 76 using atmospheric dust.

G. Filters shall be mounted in packaged bag filter section.

H. Final filters shall be 11 1/2" deep, rigid, Cambridge Filter Corp. Aeropac Filter Model 43CPI 90 or equivalent by AAF or Farr.

1. Filter element shall be factory constructed by pleating continuous sheet of fine fibered media into closely spaced pleats with safe edged aluminum separators. 2. Filter pack shall be sealed into fire retardant particleboard frame, assembled in rigid manner and not more than 11 1/2" deep. 3. Overall dimensions shall be correct to within 1/16" and squareness shall be within 1/8". 4. Filter shall have minimum average efficiency of 90% by ASHRAE Standard 52 68 test method using atmospheric dust. Initial pressure drop shall not exceed 0.55" w.g. when filters are operated at rated velocity of 500 fpm. Final pressure drop shall be 1.0" w.g. 5. Each cartridge shall have no less than 125 sq. ft. of effective media area based on 4 sq. ft. of face area. 6. Filters shall be approved by UL Class 1 under UL 900.

I. Side Access Filter Housing

1. Unit shall be complete, factory assembled housing with upstream and downstream outwardly turned flanges for insertion into ductwork system as indicated on Drawings. 2. Housing shall be reinforced heavy 16 gauge galvanized steel and shall be 21 1/4" in direction of flow. 3. Housing shall have built in lever operated locking device providing positive seal between filter and filter housing. 4. Access doors with continuous gasketing on perimeter and positive locking devices shall be provided at both ends of housing. When access door is opened, filter cartridges shall be slid into housing and retained on slide channels. 5. Channels shall incorporate positive sealing gasket material to seal top and bottom of filter cartridge frames to prevent bypass. Leakage shall be prevented between cartridges and between cartridges and doors by factory installed gasketing. 6. Filter cartridges shall be capable of being loaded or unloaded through either access door. 7. Unit shall be Cambridge Filter (Side Pac) or equivalent by AAF or Farr.

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J. Provide dry air filter gauge with scale of 0 to 2" across each filter. Gauge shall include appropriate static pressure tips, vent valves and tubing. Gauge shall be suitably marked to indicate when filter should be changed and shall be Dwyer Magnahelic Type 2003 AF.

2.38 KITCHEN HOOD EXHAUST AND MAKE UP AIR SYSTEM

A. Provide exhaust and make up air duct, intake louver and exhaust fan curb. Duct construction shall meet requirements of Ductwork Paragraph.

B. Provide through wall louver, 2" 30% efficient pleated filters, forward curved centrifugal cabinet fan, heat pipe heat exchanger, hot water heating booster coil, distribution duct and diffusers for make up air.

C. Provide stainless steel hood, exhaust duct, heat pipe heat exchanger with automatic steam and water washdown cycle, and roof mounted vertical discharge exhaust fan for exhaust air. Provide automatic dry chemical extinguishing system.

D. Kitchen hood exhaust fan shall be belt drive centrifugal, with spun aluminum housing, disconnect switch, bird screen, vibration isolator base, drain trough, up blast discharge and shroud extension. Fan shall be Powerline Model BCV, or approved equal.

2.39 KITCHEN ROOFTOP AIR HANDLING HEAT RECOVERY UNIT

A. Provide package self contained rooftop air handling unit of size and capacity shown on Drawings, for outdoor ambient temperatures from 40°F to 140°F with the following:

1. Heat exchanger, which shall provide minimum heat recovery efficiency of 66%. 2. Individual supply and exhaust, multi blade, backwardly inclined, double width, double inlet fans with adjustable belt drives and sealed ball bearings. 3. Completely weathertight galvanized steel enclosure with permanent lifting lugs. 4. Complete unit lining of 1" thick neoprene coated fibrous glass, meeting requirements of NFPA 90A. 5. Standard 2" throwaway filters located in supply section and washable grease filters, Farr 44HG or approved equal, in exhaust section. 6. Internally located drain pan with external pipe connection. 7. Magnetic starters mounted in control panel. 8. to control face and bypass dampers.

B. Exhaust fan motor shall be totally enclosed, fan cooled.

C. Unit shall be by Temp X Changer, Isovent, Gaylord or approved equal.

2.40 KITCHEN EXHAUST HOOD

A. Provide ducted kitchen range hoods where shown on Drawings with 18 gauge stainless steel housing, all welded and ground flush to #3 finish.

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B. Grease extractors shall be 18 gauge stainless steel horizontal baffles that remove grease by multiple changes of air direction and restrict passage of raw flame.

C. Provide automatic fire damper, fan control and light switch mounted on front. Hoods shall be wall or ceiling mounted and come with necessary brackets and angles.

D. Hoods shall be UL approved; provide dry chemical fire extinguishing system.

E. Provide chrome hood nozzle in each hood, piping pressurized dry chemical storage container, mechanical link detection system, local manual controls and automatic electric shutoff.

F. Work shall meet requirements of NFPA 96. Duct construction shall meet requirements of Ductwork Paragraph.

G. Hoods shall be Simplex SH I or approved equal.

2.41 STEAM HUMIDIFIERS WITH PNEUMATIC CONTROL

A. Provide steam separator humidifiers with pneumatic modulating control providing full separation ahead of integral steam jacketed control valve that discharges through internal steam jacketed drying chamber, silencing chamber and steam jacketed distribution manifold.

B. Humidifier shall receive steam at supply pressure and discharge at atmospheric pressure. Provide inlet strainer and external inverted bucket steam trap.

C. Separating chamber shall disengage and remove water droplets and particulate matter larger than 3 microns when humidifier operates at maximum capacity.

D. Provide integral, parabolic, steam jacketed plug metering valve at supply pressure and temperature. Valve shall have high range abilities to achieve full, accurate modulation of steam flow over entire valve stroke.

E. Internal drying chamber shall receive steam at essentially atmospheric pressure and be jacketed by steam at supply pressure.

F. Silencing chamber shall be steam jacketed and shall use stainless steel silencing medium.

G. Distribution manifolds shall provide uniform distribution over entire length and shall be jacketed by steam at supply pressure. Provide full length stainless steel internal silencing screen.

H. Provide interlocked temperature switch to prevent humidifier from operating before start up condensate is drained.

I. Humidifier shall be by Armstrong (Series 80), Dri Steam or Sarco.

J. Provide aluminum pan in duct 3 ft. before and after humidifier. Provide access door in side of duct.

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2.42 ELECTRIC STEAM HUMIDIFIER

A. Provide Armstrong Series EHU 500, Dri Steam (Vaporsteam) or Nortec self contained, electronically controlled steam humidifier. House internal components in steel cabinet with key locked access door. Humidifier shall be UL and CSA listed.

B. Capacity shall be field adjustable to modulate from 0 to 100% with gradual increase in amperage to avoid current surges.

C. Provide steam generator.

D. Power shall be three phase with field adjustable electrodes for efficient operation in varying water conditions. Provide electrical terminals for controlling , duct high limit humidistat and interlock switch to fan motor sail switch in duct or both.

E. Provide automatic water drain cycle to evacuate minerals and particles left in suspension in generator. Provide one drain valve for each generator. Automatic drain cycle shall be field adjustable for drain duration range of 2 to 128 seconds and drain interval range of .25 to 16 hours. Electronic circuit shall provide automatic protection from excessive electrode current and high water overflow. Provide electronic timer.

F. Provide for air gap in humidifier fill water line to prevent back siphonage of contaminated water into water supply.

G. Provide stainless steel dispersion tube sized to span widest dimension of duct to ensure uniform steam distribution over entire tube length.

H. Provide 1 1/2" diameter reinforced rubber steam hose to convey steam from generator to dispersion tube and drain condensate back to generator.

I. Provide aluminum pan in duct 3 ft. before and after humidifier. Provide access door in side of duct.

J. Provide solid state electronic humidistat for fully modulating steam flow and high limit humidistat.

K. Humidifiers, which de energize their heating elements during the period that they refill with water, shall not be acceptable. Humidification capacity must be maintained throughout any fill cycle.

L. Provide aluminum pan in duct 3 ft. before and after humidifier. Provide access door in side of duct.

M. Provide (built on) (remote) blower pack by same manufacturer as humidifier. Blower pack shall be UL listed and shall have an air proving switch to prevent humidifier operation if blower is not operating. If a power connection, separate from the humidifier, if required, it shall be provided under the work of the mechanical section, by this contractor.

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2.43 HUMIDIFIERS (SELF CONTAINED)

A. Provide centrifugal humidifiers of scheduled capacity by Bahnson, Standard Engineering or Nortec (Defensor).

B. Humidifiers shall have heavy duty totally enclosed, sealed ball bearing motor with internal overload protection.

C. Humidifier component materials shall be non corrosible.

D. Provide stainless steel filter screen and filter paper over screen.

E. Furnish aspirated cabinet controls in quantity and location shown on Drawings. Coordinate with Automatic Temperature Control Paragraph.

2.44 FAN COIL UNITS

A. Provide factory fabricated fan coil units of type and capacity indicated by Carrier, McQuay, Trane, York.

B. shall comprise:

1. Galvanized steel cabinet with baked enamel finish. 2. Service panels on the bottom of ceiling mounted equipment which shall be hinged or provided with safety chains to prevent them from falling when opened. 3. Centrifugal forward curved galvanized steel fans, statically and dynamically balanced, permanently lubricated or ball bearing shaft bearings. 4. Provide chilled and/or hot water coils as indicated with aluminum fins mechanically bonded to staggered copper tubes and leak tested at air pressure of 350 psig. 5. Provide (integral) (wall) thermostat. 6. Motors shall be 3 speed permanent split capacitor tap wound with built in overload protection. Provide integral speed switch (Hi Low Off) for all exposed console fan coils. Design conditions shall be met with fan at low settings. 7. One inch disposable filters. 8. 18 gauge galvanized steel drain pan protecting under entire length of coil. 9. Integral for automatic summer/winter changeover mounted on supply piping, factory wired and installed.

2.45 ROOFTOP AIR HANDLING UNITS

A. General Description

1. Fabricate [draw-thru] type rooftop air handling units suitable for the scheduled capacities as manufactured by Carrier, McQuay, Trane, York. 2. Fabricate units with a supply fan segment plus accessories, including [cooling coil segment] [heating coil segment] [filter segment] [mixing box segment] [ segment] [air segment] [face and bypass damper segment][discharge plenum segment] [access segment] [diffuser segment] [return or exhaust air fan segment]

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[integral face and bypass coil segment] [humidifier segment] [sound attenuator segment] [electric heat segment]. 3. Factory fabricate and test air handling units of sizes, capacities, and configuration as indicated and specified. 4. Base performance on sea level conditions. 5. All internal components specified in the air handling unit schedule shall be factory furnished and installed. Unit(s) shall be completely factory assembled. 6. Units shall ship in one (1) piece where possible. Shipping splits can be provided as required for installation. Lifting lugs will be supplied on each side of the split to facilitate rigging and joining of segments. Units requiring field installed gasketing must be assembled under supervision by factory trained and employed personnel from the air unit manufacturer.

B. Casing

1. The entire unit shall be provided with a full length, continuous, base rail channel. Base rail channels will be formed of a minimum of 12 gage galvanized steel. All major components shall be supported from the base. Integral lifting lugs shall be provided. Units without a complete and continuous base rail will not be acceptable. 2. The unit shall have a frame construction consisting of galvanized steel vertical and horizontal structural members. The frame shall be constructed to permit complete removal of the wall and roof panels without affecting the structural integrity of the unit. 3. All segments shall be double wall and shall be constructed of G90 mill galvanized sheet steel, formed and reinforced to provide a rigid assembly. The exterior casing shall be constructed of a minimum 18 gage galvanized steel. The interior lining shall be a solid lining of a minimum of 20 gage galvanized steel. 4. All access panels shall be completely removable for unit access and removal of components. 5. The unit base shall be designed with a recessed curb mounting location. The recessed curb mounting surface shall provide a continuous surface for field application of curb gasketing to create a weathertight seal between the curb and unit. Units without a recessed mounting location for the roof curb are not acceptable. 6. Roof and sidewall seams shall be continuously caulked and covered with formed 20 gauge galvanized seam caps. All panel fasteners shall be secured through standing seams to prevent fastener penetrations that are exposed to the airstream. 7. The unit shall have a sloped roof to promote drainage of precipitation and prevent standing water. The roof shall have a minimum pitch of 1/4 inch per foot. The roof shall overhang the side panels by a minimum of 2 inches to prevent precipitation drainage from streaming down the unit side panels. Units with flat roofs are not acceptable. 8. Panels shall be completely gasketed, with a Copolymer rubber sealant ribbon. 9. All panels shall be insulated with 2" 1.5# fiberglass insulation. The panel insulation must be a full 2" (non compressed) throughout the entire unit. Units with less than 2" of insulation in any part of the walls, floor, roof or drain pan shall not be acceptable. The insulation shall meet the flame and smoke generation requirements of NFPA 90A. 10. Any portion of the unit that is not insulated (gaps) or has less than 2" of insulation shall be the responsibility of the contractor to modify. 11. The cooling coil segments shall have a full width, sloped drain pan that extends 8 in. downstream of the coil. If 8 in. downstream of the coil is not provided, an drainpan must be provided in the next unit segment.

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12. The cooling coil drain pan shall be sloped to assure positive condensate drainage with connections on both sides. The pan shall be of double wall construction with a stainless steel liner and have a minimum of 2" of insulation (uncompressed). 13. Coils with finned height greater than 48" shall have an intermediate drain pan extending the entire finned length of the coil. Cooling coils in excess of 48" in height shall not be acceptable unless provided with an intermediate drain pan. The intermediate pans shall have drop tubes to guide condensate to the main drain pan. 14. Double wall access doors shall be provided in the fan, filter, and inlet segments on the coil header side of the unit. Access doors must also be provided on both sides in all sections with welded panels. 15. Doors shall be double wall construction with a solid liner and a minimum thickness of 2 inches. Doors shall be attached to the unit with a continuous, full length piano type stainless steel hinge. Latches shall be positive action, creating an air tight seal between the door and unit. 16. The exterior of the unit shall a prime coat of epoxy chromate applied to a minimum thickness of 1.5 mils. A finish coat of acrylic polyurethane shall then be applied to a minimum thickness of 2.5 mils. 17. When tested in accordance with ASTM B 117, the finished unit shall exceed 500 hour salt spray solution (5%) without any sign of red rust. 18. A prefabricated galvanized steel mounting curb shall be provided for field assembly on the roof decking prior to unit placement. The roof curb shall be a perimeter type with a complete perimeter support of the air handling unit. The curb shall be a minimum of 14 inches high. Gasketing shall be provided for field mounting between unit base and the roof curb. The curb shall include a 2”x 4” wood nailer. The roof curb shall be insulated with 1.5 inch-3# insulation. The roof curb shall also provide perimeter support for pipe chases and control cabinets. 19. An external pipe chase shall be provided to enclose field piping. The pipe chase shall have double wall construction and 1” insulation.

C. Fans

1. The supply fan segment shall be equipped with double width double inlet (DWDI) centrifugal type wheels. All fans shall be forward curved (FC) or airfoil (AF) as required for stable operation. 2. Fan and unit performance shall be rated and certified in accordance with ARI Standard 430. All units that are not ARI Certified shall be witness tested at an independent laboratory to assure performance. 3. All airfoil fans shall bear the AMCA Seal. Airfoil fan performance shall be based on tests made in accordance with AMCA standards 210 and comply with the requirements of the AMCA certified ratings program for air and sound. In addition, all airfoil wheels shall comply with AMCA standard 99 2408 69 and 99 2401 82. 4. After the pre balanced fan is installed in the air handler, the entire fan section shall be run balanced at the specified speed to insure smooth and trouble free operation. 5. The return or exhaust fan segment shall be equipped with double width double inlet (DWDI) centrifugal type wheels. All fans shall be forward curved (FC) or airfoil (AF) as required for stable operation. 6. Fan and fan motor shall be internally mounted and isolated on a full width isolator support channel using 2" springs. The fan discharge shall be connected to the fan cabinet using a flexible connection. The isolator support rail shall be structurally supported from the unit base. Cantilever supports of the isolator support base are unacceptable.

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7. Variable inlet vanes for airfoil wheels shall be an integral part of the inlet cone and constructed of heavy gage, corrosive resistant blades with zinc-plated steel inter-locking and operating mechanism. Both inlet vanes must operate from a single shaft and be synchronized for precise control. 8. The forward curved wheel shall have variable inlet vanes attached to the scroll of the fan. The support ring shall be rolled angle iron. The blades shall be heavy gage galvanized steel. Both inlet vanes must operate from a single shaft and be synchronized for precise control.

D. Bearings and Drives

1. All bearings shall be factory lubricated and equipped with grease fittings/lube lines extended to the motor side of the fan. Fan bearings shall be self aligning, pillow block or flanged type regreaseable ball bearings and shall be designed for an average life (L50) of at least 200,000 hours. 2. Fan drives shall be selected for a 1.5 service factor and anti static belts shall be furnished. All drives (up to 15 HP) shall be adjustable pitch. 3. Fan shafts shall be selected to operate well below the first critical speed and each shaft shall be factory coated after assembly with an anti-corrosion coating. 4. Fan unloading for variable air volume control shall be accomplished through a factory mounted variable frequency drive. 5. The VFD shall be factory mounted in a conditioned weather proof cabinet. The compartment shall be of double wall construction with 18 gauge galvanized steel exterior and 20 gauge galvanized steel interior. The compartment shall be insulated with 2” - 1.5 insulation. The compartment shall be adequately ventilated/conditioned for proper VFD performance. 6. After final assembly, the fan and motor assembly shall be factory balanced for 10 100% of design speed of the air handling unit. Units that are balanced for a specific point of operation shall be field balanced for the entire RPM range. 7. After the air handling unit is installed, the VFD shall be field commissioned by a factory trained and employed service technician. 8. The VFD shall be UL listed and comply with all applicable provisions of the National Electric Code.

E. Electrical Characteristics and Components

1. Fan motors shall be NEMA design ball bearing type with electrical characteristics and horsepower as specified on the schedule. Motors shall be 1800 RPM, open drip proof type. 2. All motors shall be high efficiency. 3. The motor shall be mounted on the same isolation base as the fan. The motor shall be on an adjustable base. 4. Each unit shall be equipped with a unit mounted, non-fused disconnect switch. The disconnect shall be mounted on the exterior of the unit in a NEMA 3R enclosure. The disconnect shall be UL listed. 5. The disconnect shall be factory wired through flexible metal conduit to the power panel. All wiring shall be done in accordance with the latest N.E.C. Guidelines. 6. A variable frequency drive (VFD) shall be furnished, installed, and wired by the unit manufacturer in accordance with the paragraph on VFD’s.

F. Coils

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1. Cooling and/or heating coils shall be furnished to meet the performance requirements set forth in the schedule. All coils shall have performance certified in accordance with ARI Standard 410. 2. Water coils shall be counter flow. Water velocities shall not to exceed 7 feet per second and/or exceed the water pressure drops scheduled. All coil connections shall be on the same side. 3. Drainable Water coils shall be designed to operate at 250 psig design working pressure and up to 300F and shall be tested with 325 psig compressed air under water. All vent and drain connections shall be extended to the outside of the unit casing. 4. Water and DX coils shall be 5/8" O.D. copper tube, staggered in direction of airflow. Tubes shall be mechanically expanded. The tubes shall have a minimum tube wall thickness of 0.020". Extended surface shall consist of aluminum fins with a minimum thickness of 0.006". Units that require dis-assembly of the unit for coil removal shall include a coil with a minimum tube wall thickness of 0.035 and a minimum fin thickness of 0.009. 5. Direct Expansion coils (DX) shall be designed to conform to ANSI B9.1 (Safety Code for Mechanical Refrigeration) when operating with a refrigerant pressure not exceeding 250 psig. Coil shall be tested to 325 psig compressed air under water. The completed coil shall be dehydrated and sealed for shipment. Each coil shall be furnished with a brass distributor with solder-type connections. Suction and discharge connections shall be on the same side. 6. Steam Distributing coils shall be designed for 100 psig pressure and a corresponding steam temperature of 338F. Coils shall be tested with 315 psig compressed air under water. The outer tubes shall be 1” O.D. with the inner distribution tube 5/8” O.D. The circuiting shall be non-trapping condensate design. The steam shall discharge in the direction of condensate flow. The tubes shall have a minimum tube wall thickness of 0.035". Extended surface shall consist of aluminum fins with a minimum thickness of 0.008". 7. All coils shall be installed on tracks for easy removal from the air handling unit. 8. Headers shall be of heavy seamless copper tubing, silver-brazed to tubes. Connections shall be of red brass, with male pipe threads, silver-brazed to the headers. A 1/4" FPT, plugged, vent or drain tap will be provided on each connection. 9. Coil casing to be constructed of 16 gage galvanized steel Intermediate casing supports shall be supplied for finned lengths that exceed 60". 10. Coil grommets shall be provided on all coils to completely seal the area between the coil connection and the unit casing. 11. Integral Face and Bypass Coils shall be factory supplied and installed. Coils shall be as manufactured by the L.J. Wing Company. 12. Each coil shall consist of a built-in series of finned heating elements and by-passes with interlocking dampers. Dampers shall be controlled by electric [pneumatic] damper motor and air-stream thermostat. 13. Dampers shall be 16 gauge, roll-formed steel with air-dried enamel finish. The coil casing shall be 14 gauge galvanized steel with rigid framework, completely painted. Coils shall be factory tested at 200 psig steam and 500 psig hydrostatic pressure. 14. Electric heat of capacity, voltage and steps of control specified shall be provided as an integral part of the unit. Field installed segments shall not be acceptable. The electric heater and control panel shall be a U.L. listed electric duct heater. 15. All electric heater elements shall be of 80% nickel and 20% chrome. Coil elements shall float freely in ceramic bushings which are stacked in support brackets, not exceeding 3.5 inches apart. Coils shall be machine crimped into stainless steel terminals which are

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insulated with high temperature ceramic Insulators. Heater casing and support brackets shall be of galvanized steel. 16. All electric heaters will be supplied with internal wiring of controls, contactors, etc. including 120-volt, 60 hertz control circuit transformer, automatic reset thermal cut-out and fuses per NEC and UL (on heaters exceeding 48 amps).

G. Filters

1. Flat Filter Segments shall accommodate 2 inch media. Media shall be 30% pleated type. 2. Angle Filter Segments shall accommodate 2 inch media. Media shall be 30% pleated type. 3. Rigid Filter Segments shall accommodate 2 inch prefilters and high efficiency rigid filters of the specified efficiency. Filter frames shall be provided with neoprene gasketing on the leaving air side of the filter. 4. Rigid filter media shall be 12 inches deep and the efficiency shall be a minimum of 95% as determined by ASHRAE Standard 52 76. Filter media shall be listed Class 2 under U.L. Standard 900. 5. Carbon filter segment shall accommodate a 2 inch prefilter and 1 inch deep trays of carbon media. Pre filter media shall be 30% pleated. Carbon filter media shall be activated charcoal suitable for gas filtration. 6. Bag Filter Segments shall accommodate 2 inch prefilters and high efficiency bag filters of the specified efficiency. Filter frames shall be provided with neoprene gasketing on the leaving air side of the bag filter for pressure sealing assembly. 7. Bag filter media shall be 21 inches deep and the efficiency shall be a minimum of 95% as determined by ASHRAE Standard 52 76. Filter media shall be listed Class 2 under U.L. Standard 900. 8. Absolute-HEPA filter segments shall accommodate Absolute-HEPA type filters. 9. HEPA filter media shall be 12 inches deep and the efficiency shall be a minimum of 99.97% [99.99%], as determined by ASHRAE Standard 52-76. Filter media shall be listed Class 2 [Class 1] in accordance with U.L. Standard 900. 10. 1The filters shall be sealed against the filter frame with spring-loaded, nut and clip assemblies to prevent air bypassing around the filter. 11. 1A magnahelic, differential pressure gage shall be factory installed and flush mounted on drive side to measure the pressure drop across the filters.

H. Appurtenances

1. The Air Blender Segment shall have factory installed air as an integral part of the air handling unit. Blenders shall be integrated into the overall unit design to maximize the performance of the downstream components. The blenders shall be fixed devices, with no moving parts. 2. The Economizer Segment shall contain three sets of dampers to control the return, exhaust and outside air. The economizer section shall be an integral part of the unit. 3. The Access Segment(s) shall be provided for placement anywhere in the unit to gain access to a particular area. The access segment shall be available with a depth 24". 4. The Discharge Plenum shall be provided as the last segment in direction of airflow. The plenum shall be suitable for single or multiple discharges [horizontal] [top][bottom].

I. Dampers

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1. Dampers shall be of low leak design having stamped 16 gage galvanized steel blades. The damper blades shall be provided with a PVC coated polyester fabric mechanically locked into the blade edge. The jamb is a flexible metal, compression type. Leakage shall not exceed 7.20 CFM/square foot at 1" w.g. and 14.5 CFM/square foot at 4" w.g. The blades shall be parallel acting.

2.46 PACKAGED, AIR COOLED, DX ROOFTOP UNIT

A. General Requirements

1. Provide where shown on drawings, a completely factory assembled, piped, wired and tested, rooftop heating and coiling unit. Unit shall have a full charge of refrigerant, and compressor oil. The rooftop unit shall be shipped in one piece and shall have a single point power connection. 2. Acceptable Manufacturers shall be Carrier, McQuay, Trane, York. a. Provided that they meet the requirements of this specification and the performance requirements listed in the equipment schedules. Note particularly the following items. b. The submitted rooftop unit must produce the CFM listed in the schedule, at the static pressure, external to the unit, listed in the schedule. This performance must be accomplished using equal or less fan horsepower than the scheduled unit and at an coil face velocity equal or less than the scheduled unit. c. The discharge air temperatures listed in the schedule are at the discharge of the unit into the supply ductwork, NOT the discharge temperatures at the evaporator coil. These temperatures must be produced by the submitted unit. Draw through rooftop manufacturers must fully account for fan heat gain in determining their discharge temperatures. d. The scheduled sensible and total loads, listed in the schedules, are based on actual calculation, not manufacturer's catalog data. Both loads must be met at the outdoor air and return air temperature, to the unit, listed in the schedules. e. The rooftop unit shown on the drawings has been coordinated with architectural and structural elements, and with electrical service requirements. If a different unit is submitted, ALL mechanical, electrical, architectural and structural modifications which are required shall be performed, by the mechanical contractor, under the work of the mechanical section, under the original contract price.

B. Submittal Requirements

1. This paragraph supplements the "Submittals" paragraph, in Part One of these specifications. In addition to complying with all submittal requirements contained in Part One, the rooftop unit submittal shall contain ALL performance and other items listed in the schedule, as well as: a. The air temperatures, entering and leaving the evaporator coil. b. The temperature gain in degrees, due to the return (or exhaust) and supply fan. c. The component pressure drops of all items internal to the unit i.e. coils, filters, dampers, etc.

C. Quality Assurance

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1. Rooftop unit shall be rated in accordance with ARI Standard 360. Unit shall be capable of starting and running at 115°F ambient outdoor temperature per the maximum load criteria of ARI Standard 360. Unit shall be capable of mechanical cooling down to 55°F ambient temperature. 2. Gas fired units shall be certified by AGA or UL as a total package. 3. Unit shall be designed to conform to ANSI B9.1 Safety Code and the National Electrical Code. 4. Unit casing shall be capable of withstanding Federal test method Standard 141 (Method 6061) 500 hour salt spray test. 5. Air cooled condenser coils shall be factory leak tested at minimum of 150 psig and pressure tested at 450 psig. Evaporator coils shall be factory pressure and leak tested at minimum 300 psig. 6. Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation. 7. All fan shaft bearings shall have a life of 200,000 hours at design operating conditions in accordance with ANSI B3.15.

D. Equipment Requirements

1. Unit Casing a. Unit casing shall be constructed of galvanized steel, and be protected against corrosion to such an extent that Salt Spray Test, referenced in the Quality Assurance Paragraph above can be passed. b. Casing shall be weatherproof. If rooftop unit casing is found to leak after it is installed, within the guarantee period, then whatever modifications to the unit are required to make the casing water tight shall be made, under the work of the mechanical section, within the original contract price. c. Hinged, insulated, man size access doors, which are capable of being secured and locked in the open position, shall be provided on both sides of the casing, to allow access to all fans and drives, coils and all filters. It shall not be necessary to remove any bolts to open the access doors. A hinged, lockable panel shall also be provided for the control cabinet. If this cabinet is external to the unit casing it shall be NEMA 3R (rainproof). All hinged panels shall be provided with suitable gasketing to prevent moisture leakage. Easily removable man-sized access panels shall also be provided for the condensing unit section and the gas furnace (if provided). d. All interior surfaces exposed to the moving airstream shall be coated with insulation having R Value equivalent to 3/4" glass fiber insulation. On units without internal casing sheet metal liner, the glass fiber insulation shall be coated on the airstream side to minimize erosion. Insulation adhesive shall maintain satisfactory adhesion over a range of 20 to 180°F. e. Unit casing shall be equipped with lifting lugs to facilitate overhead rigging. 2. Fans a. Evaporator and Return/Exhaust Fans: 1) Evaporator and return/exhaust fans shall be statically and dynamically balanced. 2) Provide fixed pitch fan pulley and variable pitch motor pulley. The mechanical contractor shall provide, under the work of the mechanical section, a fixed pitch motor pulley. Pulley size shall determined when balancing is complete. Pulley shall replace the variable pitch pulley, when balancing is complete. Provide fan and motor structural steel sled, such that

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motor position may be altered to adjust fan belt tension. Fan drive shall have a service factor of 150%. 3) Provide spring type vibration isolators under the fan sled with a minimum of 90% isolation efficiency. 4) Fan shaft bearings shall be self aligning, pillow block type. b. Condenser Fans: 1) Condenser fans shall be direct drive propeller type, statically and dynamically balanced with 3 phase motors. Fans shall discharge air vertically upwards and be protected by PVC coated steel wire safety guards. 3. and Refrigeration Components a. Compressors shall be reciprocating, and shall be located for easy servicing. Compressors shall be equipped with cylinder unloading (minimum of 4 steps) and factory prepiped hot gas bypass system to maintain capacity control at minimum cooling loads. b. Semi hermetic compressors shall be mounted on spring type isolators with a minimum isolation efficiency of 95%. c. Each compressor shall be equipped with an automatically reversible oil pump, insert type crankcase heaters and suction and discharge service valves. d. Unit shall be equipped with dual refrigeration circuits each containing: liquid line service valve, filter drier, sight glass, and fusible plug. e. Maximum compressor operating speed shall be 1800 rpm. f. Provide the following safety controls and equipment over temperature, over current, oil equalizer lines on circuits on dual compressors, high pressure and low pressure switches. Provide manufacturers recommended time delay, to prevent compressor short cycling. Provide any additional safety controls, recommended by manufacturer for proper operation, in addition to those listed above. See temperature control drawings for any requirements for provision of auxiliary contacts. 4. Evaporator and Condenser Coils a. Evaporator coil shall be constructed of aluminum fins mechanically bonded to seamless copper tubes. Coils shall be full face active type during full and part load conditions. b. Condenser coils shall be constructed of aluminum fins mechanically bonded to seamless copper tubes. 5. Heating Section a. Electric Coil: 1) Electric resistance heaters shall be factory installed open wire nichrome element type, insulated with ceramic bushings, and include operating and safety controls. See temperature controls drawings for operating controls requirements and required auxiliary contacts. Safety controls will include at a minimum: automatic and manual reset high temperature limit switches, overcurrent protection manual reset circuit breakers and branch circuit protection. Provide a minimum of four stages of electric heat. b. Gas Furnace: 1) Gas furnace shall be (single stage) (two stage). The burner shall be factory fired and adjusted for proper combustion. 2) All gas piping shall enter the unit cabinet at a single location. Provide ignition system, gas train and safety controls. Safety controls shall include: loss of airflow switch, temperature limit switches, flame rollout switch and pilot flame proving switches and any other controls required for proper

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system operation and code compliance. Provide redundant main gas valves and any other gas train components required by DCAMM’s insurer. 6. Filter Section a. Filter section shall consist of 2" thick, disposable glass fiber filters of commercially available sizes. 7. Automatic Temperature Controls a. For constant volume systems, provide electronic, programmable heating/cooling room thermostat with sub-base. b. For VAV systems, provide microprocessor based control system to control discharge air temperature, economizer operation, night setback and morning warm up. Provide self contained controls to govern variable air volume system operation. c. Equipment manufacturers responsibilities for provision of automatic temperature control components and interface to ATC Provided components are detailed on the control drawings which accompany these specifications. d. Control dampers shall be low leakage type with leakage not to exceed 3% leakage at 3" w.c. differential pressure when fully closed. Smoke dampers, are to be supplied with seals which will withstand temperatures of 400°F. e. The means of supply fan capacity control shall not be discharge dampers. If two motor combinations or two speed motors are provided for the supply fans, they shall not be used without an additional means of capacity control such as inlet vanes. 8. Motors and Electrical Requirements a. All unit power wiring shall enter the casing at a single location. b. Electrical control cabinet shall include the following items: 1) Power terminal block 2) Power transformer switch 115 volt secondary and 115 volt control fuse 3) 24 volt control transformer and fuse 4) All necessary relays 5) 115 volt terminal strip 6) 24 volt terminal strip containing wired terminals for all controls, numbered in accordance with the wiring diagram. 7) An isolated 24 volt field wiring terminal strip 8) An electrical print pocket which shall contain the electrical print and maintenance instructions. c. All fan motors shall be high efficiency type see motor and starter paragraph of these specifications for requirements. d. All power wiring shall be in conduit no exposed wiring shall be permitted. All power or control wiring within the condenser section and any other wiring exposed to the elements shall be in vapor tight conduit. e. For VAV systems the unit manufacturer shall furnish, install and wire VFD’s in accordance with the paragraph in this specification.

E. Execution

1. Startup of the rooftop unit shall be performed under the direct on site supervision of a factory trained manufacturer's representative. Startup shall not be performed exclusively by the mechanical contractor. See further requirements for startup under the Startup, Testing and Balancing Paragraph in Part Three of these specifications. 2. The Startup testing and Balancing Paragraph in Part Three of these specifications contain requirements for two meetings to be held in the Engineer's Office between the

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mechanical contractor, the balancing contractor and the automatic temperature control contractor. The rooftop unit's manufacturers representative shall attend both meetings. 3. The Startup, Testing and Balancing Paragraph of these specifications requires that the rooftop unit manufacturer's representative be on site during the time when those parts of the air system balancing and temperature control testing, which effect the rooftop unit takes place. See Part Three of these specifications for specific requirements.

2.47 BUILT UP AIR HANDLER

A. General

1. Provide built up air handling unit as shown and scheduled on Drawings to supply air to building as part of single duct (variable) (constant) air volume system. 2. Unit Manufacturer shall be responsible for complete design of units, all components, complete shop and field erection of units and all components, operation and performance of units under unit manufacturer's nameplate. Be responsible for coordination of the delivery and erection of all units in compliance with construction schedule; provision of all necessary external piping, ductwork and miscellaneous connections required to complete the installation of the units in cooperation with and as directed by the manufacturer. 3. The unit manufacturer shall be responsible for provision of fans, dampers and all other unit and plenum components as specified in this section or other sections of this division and performance characteristics as shown in schedules or on drawings. 4. Unit shall be modular, factory fabricated for shipping and field assembly or designed for field erection by experienced manufacturer of large custom air handling units, that maintains engineering and production staff. (Maximum weight of final assembled unit shall not exceed pounds.) a. Provide proof of credentials of manufacturer's staff as required by DCAMM and Designer. b. Provide evidence satisfactory to DCAMM and Designer that manufacturer has built and installed ten heating and cooling air handlers larger than 50,000 cfm within last three years. 5. Shop drawings shall be subject to approval of the DCAMM and Designer. 6. Provide services of experienced field engineer employed by manufacturer to supervise erection, testing and troubleshooting of units. Erection supervision shall be full time. 7. Certify conformance with performance requirements specified and shown on Drawings. 8. Provide necessary appurtenances to perform as specified, whether or not expressly required by Contract Documents mentioned herein in conformance with good trade practice, as determined by Designer. 9. Seal casing penetrations made in field for piping, conduit, tubing and equipment. Advise manufacturer in advance of required field penetrations of casing. Make and seal penetrations under supervision of manufacturer's field engineer. 10. 1Acceptable manufacturers will be Buffalo, VSM, Specialties, Industrial Sheetmetal, Air Enterprise, Cambridgeport Air, Miller Picking, Mammoth, Pace, Gamewell or Semco, providing they meet the requirements of this section, and the performance requirements listed and schedules.

B. Testing

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1. Test to ensure structural integrity, design suitability under simulated operating conditions, system operation and minimum vibration levels as specified. Certify that unit complies with design intent and Contract Documents. 2. Following tests shall be performed: a. Pressure test water coils if coil manufacturer has not already performed pressure test and piping. b. Air pressure test with fans operating at shut off pressures to ensure tight housing construction and integrity. c. Unit operation and vibration analysis. Operate fans at design rpm, set fan drive and conduct complete vibration spectrum as specified. Fan, motor, drive and base assembly vibration shall be brought to within specified levels. Check motor and drive vibration with fan as assembly. d. Energize electrical devices to ensure operational integrity prior to shipment. Replace non functioning items. e. Submit housing panel acoustical, structural and physical properties performance test data before shipment from independent recognized test laboratory.

C. Factory Built Modular Units 1. Base: Base shall consist of steel beams or channel for direct bearing support for components in casing, and shall be painted with Rustoleum primer and Rustoleum exterior enamel. Base shall have minimum 1/2" thick steel lifting lugs welded to corners of each module. 2. Floor a. Floor shall be of 3/16" thick steel plate welded to sub base. Pan shall be braced to support internal equipment components without sagging or pulsating. Floor shall be painted with Rustoleum primer and Rustoleum exterior enamel. Provide drains with Type L copper piping extending through sides of unit base. b. Underside shall be insulated continuously with 1 1/2 in, thick fiberglass insulation board, with density of 3 pounds per cubic foot and foil vapor barrier. Joints between insulation board sections shall be sealed vapor tight with tape and mastic sealer. Insulation shall be held in place with weld studs and clips. Bottom of base shall be covered with min. 16 ga. galvanized sheetmetal and sealed weathertight at all joints and penetrations. Void between this closure and rigid insulation shall be filled with fiberglass batts to full depth of joists. 3. Drain Pan a. Drain pan shall extend across entire cooling coil section and shall be 20 gauge stainless steel or 1/8" thick aluminum plate continuously welded to form watertight basin. Sides shall be at least 4" high with threaded, capped 1 1/2" half coupling welded to one side for drainage. b. Drain pan shall be insulated on underside with minimum 1" thick fiberglass board secured in place with weld studs and clips with foil vapor barrier. Joints shall be taped and sealed vapor tight with mastic. Drain pan shall be supplied with floor drains with type L copper drain piping extending through the side of the unit base.

D. Field Erected Units

1. Field erected units shall be constructed on a concrete curb provided under other sections. Mechanical Division Contractor shall carefully coordinate dimensions of air handling unit with curb. He shall also coordinate locations of all penetrations including electrical penetrations and floor drains with requirements of built up air handling unit. The

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Mechanical Division Contractor shall prepare the concrete curb drawings which he shall give to the Construction Manager for coordination and erection.

E. Housing

1. Housing walls and roof shall be separate frame and panel or integral frame and panel, aluminum or galvanized steel. a. Fasteners in steel housings shall be stainless steel screws with stainless steel washers and neoprene grommets. b. Fasteners in aluminum construction shall be closed end aluminum rivets. 2. Panel skin thickness, stiffener and frame spacing and thickness, and core density shall be designed to eliminate panel pulsation and to limit maximum deflection to 1/200 of any span at design positive or negative pressures. Design pressure shall be equal to 1.5 times fan static pressure, at fan shut off pressure. 3. Panels shall be double wall with inner perforated liner and non perforated exterior sheet. Panels shall be minimum of 2" (or 4") thick packed with fibrous glass with minimum density of 4 pounds per cubic foot. Panels downstream of cooling coil and/or final filters shall have fibrous glass completely encapsulated in a high strength plastic film (Mylar or Tedlar) to preclude any fiber entrainment in airstream. a. Galvanized steel exterior surfaces shall be specially treated for painting and shall be epoxy painted. Color shall be as selected by Designer. b. Aluminum exterior sheet shall be primed and painted with color selection by Designer. c. All paint systems shall consist of a minimum of one prime coat and two finish color coats shop applied to properly prepared surfaces. d. Paint finish shall be protected from damage during shipment and field assembly. Any field touch up required shall be completed to Designer ’s satisfaction. e. Indoor units need not be painted.

F. Panels including insulation, shall meet NFPA 90A fire hazard rating requirements.

1. Panels shall be tested in accordance with ASTM E90 70, E413 73 and C423 66 for sound transmission loss and sound absorption coefficients. Panels shall meet the following minimum requirements:

Acoustical Performance for Both Airborne Noise Transmission and Radiated Noise Transmission

2" Panels Octave Bank Frequency(Hz) 125 250 500 1000 2000 4000 Absorption Coefficient 5.8 .93 1.16 1.18 1.15 1.12 1.10 NRC Transmission Loss (DB) 26 29 33 44 52 60 38 STC

4" Panels Octave Band Frequency (Hz) 125 250 500 1000 2000 4000 Absorption Coefficient .70 1.14 1.18 1.14 1.14 1.16 1.15 NRC Transmission Loss (DB) 26 32 38 51 60 67 43 STC

2. Submit published acoustic test data documented by independent laboratory, to establish that panels meet minimum acoustical requirements. 3. Access doors shall be double wall with insulation as specified for panels. Doors shall close against gasket and shall be air tight.

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a. Provide 1/4" tempered or wired glass viewing windows. Windows downstream of cooling coils shall be double glass (thermopane), with air tight rubber seals. Provide desiccant in air space. b. Doors shall be at least 60" high x 24" wide and shall have three tapered latches to force door against gasket. c. Doors on suction side of fan shall swing out and doors on discharge side shall swing inward. Latches shall operate from both sides of door. 4. Provide removable access panels or doors, for removal of coils, fan and motor. Panels shall be bolted in place. Provide supports for field mounting of unit heaters. 5. Panels shall be factory sealed, air tight at corners and seams without visible caulking on casing exterior. Modules shall be assembled with caulking and gasketing in field and shall be air tight without exterior visible caulking. 6. Safing panels to seal coils, filter banks and attenuator banks to casing and casing to building structure shall be aluminum or stainless steel for cooling coils and aluminum, stainless or galvanized steel otherwise. a. Joints between safing and equipment and casing shall be lapped or flanged. b. Joints between steel safing and equipment and casing shall be fastened with stainless steel screws, stainless steel washers, and neoprene grommets. c. Joints between aluminum safing and equipment and casing shall be fastened with aluminum screws or closed end rivets. 7. Roof shall be flat without external standing seams. Cover assembled roof with continuous rubber Hypalon membrane roofing system with 20 year warranty. Provide underlayment as required by roof membrane manufacturer. No fasteners shall protrude from top of roof panels that could damage roofing. Roof membrane shall be installed by roof membrane manufacturer's approved installer. Installation of the membrane by the air handler manufacturer is not acceptable.

G. Electrical

1. Provide vaportight incandescent lighting fixtures by Appleton Electric Co. (Type VL) size 150 300 W, or equivalent by GE or Sylvania in each AHU compartment, and outside unit on all four sides of outdoor units. a. Fixture shall have cast alloy box with threaded hubs, and guard over screw in gasketed glass diffuser. Provide 150W 120V incandescent lamp. b. Wiring shall be #12 copper type THWN in heavy wall galvanized rigid steel conduit. Wire to cast watertight switch boxes with switch and trim plate on exterior of casing at each access door. Each switch shall energize lights in adjoining section of casing. Provide single point connection for 120V branch circuits. 2. Provide galvanized rigid steel conduit from fan motors through wall of casing for wiring. Connection to fan motor shall be liquid tight steel conduit. Rigid conduit shall be fixed to casing and shall not interfere with operation or access. Electric work shall be in accordance with National Electrical Code.

H. Fans: Provide vane axial fans by Joy, Flakt, Woods, Buffalo or Chicago.

1. Fan assemblies shall be completely isolated with structured steel spring vibration isolation bases by Mason (type SLR) or equivalent by Amber Booth, Korfund or Peabody with 1 1/2" minimum static deflection. Provide two thrust arrestors for each fan.

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2. Provide air traverse station Voluprobe/FI as manufactured by Air Monitor at inlet of each fan. Flow measuring stations which use honeycomb or cylindrical type air straighteners are not acceptable. Supply calibration curve showing pitch angle against air flow increasing and decreasing. 3. Provide required van axial fans where shown on Drawings of capacities and types indicated in Fan Schedule. a. Fan manufacturer shall certify that the fan shall deliver the scheduled volume and pressure when tested in accordance with the latest edition of AMCA Standard 210. b. Fan casing shall be heavy gauge steel, impeller blades shall be cast aluminum alloy, impeller hub shall be cast in heat treated aluminum alloy. The blades and hub casting shall be 100% x ray examined before machining. The impeller blade thrust bearings shall be housed such that they are completely immersed in grease at all times. Provide extended lubrication lines to exterior of casing. c. Fan blades shall be automatically controllable through design pitch range to vary volume and pressure characteristics across range. Each blade shall be indexed for various pitch settings and shall be capable of stepless control across complete pitch range while operating at design speed. d. Blades in controllable pitch hub shall be remote controlled by pneumatic actuator and pilot positioner furnished by fan manufacturer. Actuator shall be mounted external to fan on fan casing. e. Actuator and positioner shall avoid hysteresis and to ensure precise blade angle setting for any signal pressure, regardless of direction of travel. Actuator shall change blade pitch range by means of 3 15 psig control signal from automatic temperature control panel. f. Fans shall be direct motor driven as indicated on Drawings and Fan Schedule and as follows: 1) Fans shall have motor inside fan housing downstream from wheel and fan rotor assembly attached directly to motor shaft, properly keyed and secured with ball bearing locknut and washer. 2) Fan rotor shall be whirl tested to 125% of operating speed and statically and dynamically balanced on fan motor shaft to maximum tolerance, guaranteed in writing, of 1 mil double amplitude at design operating speed. 3) Motor shall have AFBMA, 20,000 hr. B 10 target life ball bearings, Class F insulation using thermo setting non hygroscopic insulating varnish to allow operation in 40°C ambient and external copper grease leads. Motors shall be capable of operating at voltages specified on schedules. 4) Fan motors shall be NEMA standard totally enclosed, air over (TEAO), squirrel cage induction, single speed, single winding, continuous duty, variable torque suitable for operation in vertical, horizontal or angular position. 5) Conduit box shall be mounted on fan casing exterior and lead wires from motor conduit box shall be protected from airstream by airtight metal conduit. 6) Provide inlet bells with screens. g. Provide discharge cones with flanges on both ends for attachment to plenum. Provide gasket at connection to plenum. Cone flanges shall be same thickness as fan flanges. h. Provide supports for horizontal mounting, by fan manufacturer, bolted to inlet and discharge flanges of fan. Supports for fans 48" diameter and larger shall be cross braced to prevent misalignment and add structural rigidity. Supports shall be the

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following gauges of carbon steel: 3/16" for fans up to 38" diameter; 1/4" for fans 42 1/4" diameter and larger. i. Provide companion flanges to receive flexible connectors of same thickness as fan flanges by fan manufacturer. j. Submit fan manufacturer's published performance curves, based on tests in accordance with current AMCA standards and in AMCA approved laboratory, to define Sound Power Levels (PWL), re: 10 12 W for each of eight frequency bands. k. Submit fan manufacturer's published sound power level data based on actual test on fan sizes being furnished in accordance with current AMCA Standards. l. Ensure that fan manufacturer's field storage and start up instructions are followed. Each fan shall have instructions attached at time of shipment. m. Exceptions to Contract Documents shall be stated by fan manufacturer at time of bid. n. Motors shall be suitable for reduced voltage starting. o. Motors shall be high or premium efficiency type. See "Motors and Starters" paragraph of this specification for required efficiencies and other requirements. p. Provide welded, heavy gauge steel, conical outlet diffuser, with tubular central core. Diameter of central core shall be same as hub of fan. Provide flexible connector between fan discharge and diffuser inlet. q. Supply fans with free air inlet shall have inlet bells suitable to minimize pressure losses. r. Fans shall have drive motor mounted on structural steel base upstream of rotor and external to fan casing, with inlet bell and fan casing supported from structural base. Provide protective wire cage at fan inlet covering drive motor and inlet bell. s. Fans shall be tested by fan manufacturer and balanced within 1 mil double amplitude at 125% of rated speed and shall be rechecked after installation in unit.

I. Chilled Water Coils

1. Chilled water coils shall have ½" or 5/8" O.D., 0.035" thick copper tubes with helically wound aluminum fins. a. Casing shall be hot dip galvanized steel. b. Headers shall be steel barrels with vents, drains and serpentine continuous tube design, suitable for 200 psi working pressure. 2. Coils shall be housed in factory fabricated frame independent of unit casing. Coil frames shall be 11 gauge hot dipped galvanized steel. a. Coil frames shall support coil sections independently allowing coil to be removed through unit casing, normal to direction of air flow, without disturbing other coil sections. b. Coil casing shall have removable panel on each side. c. After coils are piped through casing, seal pipe penetrations. 3. Each coil tier shall have condensate drain pan extending at least 6" in direction of air flow individually piped to unit pan.

J. Duct Silencers

1. Provide prefabricated duct silencers as scheduled and as described herein, at locations shown on Drawings, by Industrial Acoustics (Quiet Duct), Titus or United Sheet Metal Industrial Acoustics model designations and performance data are specified to establish standard of quality for material and performance.

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2. Outer casings of rectangular silencers shall be 22 gauge galvanized steel as required by ASHRAE and SMACNA Standards. a. Seams shall be lock formed and mastic filled. b. Interior casing for rectangular silencers shall be 26 gauge perforated galvanized steel. 3. Filler material shall be inorganic mineral or glass fiber packed under not less than 5% compression. Material shall be inert and vermin and moisture proof. Filler shall have ASTM E 84, (NFPA Standard 255) (UL No. 723) combustion rating of 25 flame spread, 15 smoke developed and 20 fuel contributed. 4. Silencers shall not leak air or fail structurally when subjected to differential pressure of 8" w.g. inside to outside of casing. a. Acoustic testing shall meet ASTM E 477 standard method of testing duct liner materials and manufactured silencers for acoustical and airflow performance. b. Tests shall be run both with and without air flowing through silencer, and at not less than three different flow rates. c. Ratings shall be based on test data from nationally known, qualified independent laboratory. d. Test methods shall eliminate effects due to end reflection, vibration, flanking transmission, and standing waves in reverberant room. e. Air flow and pressure loss measurements shall be made in accordance with applicable portions of ASME, AMCS, and ADC airflow tests. 5. Air flow shall be in same direction as attenuation for tests on dynamic insertion loss. Sound power levels shall be measured at downstream end of silencer. Dynamic insertion loss in dB shall not be less than that scheduled below at face velocity of +1000 FPM for High Pressure Drop Silencers and,

MINIMUM DYNAMIC INSERTION LOSS IN dB Re: 10-12 Watts

Silencer Type Face Velocity (FPM) Length OCTAVE BAND CENTER FREQUENCY (Ft.) 63 125 250 500 1000 2000 4000 8000

IAC Type +1000 5 8 13 20 35 50 49 36 25 "Es" 3 5 10 17 28 36 34 23 16

6. Silencers shall not produce self noise levels in dB re 10 12 Watts that exceed those given below at face velocity of 1000 fpm. a. Air flow shall be in same direction as attenuation for tests on self noise levels. Sound power levels shall be measured at downstream end of silencer. b. Self noise levels given below are based on 24" x 24" cross section production unit.

MAXIMUM SELF-GENERATED SOUND POWER LEVEL IN dB Re: 10-12 Watts

Silencer Type Face Velocity (FPM) OCTAVE BAND CENTER FREQUENCY

63 125 250 500 1000 2000 4000 8000

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IAC Type +1000 42 35 33 32 34 33 27 22 "Es"

7. Installation of Duct Silencers a. Silencer manufacturer's basic installation instructions shall not be comprised. Duct silencer supplier or qualified representative shall be responsible for providing such supervision as may be required to ensure correct and complete installation of duct silencers. 8. Silencers shall be resiliently isolated from building construction at points of penetration of building structure with ½" - 3/4" minimum of 3 lb/cf density fibrous glass. Seal penetration air tight with non hardening caulk. 9. Multiple silencer units grouped together in parallel within duct system shall be sealed airtight with 3M EC 800 sealant or equivalent by Hardcast, Ductmate or United Sheetmetal. 10. Selection shall be according to schedule on drawings.

K. Air Filters

1. Frame a. Filter bank framing shall be 16 gauge galvanized steel or extruded aluminum rack system by Farr, Cambridge or AAF. b. Aluminum framing members shall be at least 0.09" thick. Frames shall be suitable for upstream or downstream filter servicing, cut to size and pre punched for easy assembly into modules of size and capacity noted on Drawings and in Specifications. c. Framing shall be permanently gasketed to prevent bypass of unfiltered air. If required, provide suitable aluminum vertical support members to prevent deflection. Vertical supports shall not interfere with installation or operation. d. Framing system shall incorporate factory installed positive sealing device for each row of filters, to facilitate installation and removal of cartridges while preserving seal between gasketed filter elements while bank is in operation. e. Provide hardware necessary for factory assembly. 2. Filters a. Shall be UL Class 2, 2" (or 4") thick pleated fabric filter. b. Filter shall have welded steel wire grid support. c. Filters shall not unload or collapse under high velocity or static pressure. d. Efficiency shall be 25 to 30% as measured by ASHRAE Test Standard 52 76. e. Initial pressure drop shall be less than 0.28" at a velocity of 500 fpm. Filters shall be designed to operate at up to 500 fpm for the 2" thick filter and 600 fpm for the 4" thick filter. f. Filters shall be Farr 30 30 or equivalent by Cambridge or AAF.

L. Final Filters

1. Provide final air filters and frame, as manufactured by Farr Riga Flo 200, Cambridge Air Filter or American Air Filter. Filters shall be as follows: a. Filter media shall be of high density microfine glass fibers which are laminated to a non woven synthetic backing to form a lofted filter blanket. The filter media shall have an average efficiency of 90 95% on the ASHRAE Test Standard (52 76). It shall have an average arrestance of not less than 99% on that standard. Filters shall be listed by Underwriters' Laboratories as Class II.

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b. The media support shall be a welded wire grid with an effective open area of not less than 96%. The welded wire grid shall be bonded to the filter media to eliminate the possibility of media oscillation and media pullaway. The media support grid shall be formed in such a manner that it affects a tapered radial pleat design. The grid shall be designed to support the media both vertically and horizontally. c. Contour stabilizers shall be permanently installed on both the air entering and air exit sides of the filter media pack to insure that the tapered radial pleat configuration is maintained throughout the life of the filter. The filter shall be capable of withstanding 10" w.g. pressure drop without noticeable distortion of the media pack. d. The enclosed frame shall be constructed of galvanized steel. It shall be constructed and assembled in such a manner that a rigid and durable enclosure for the filter pack is effected. The periphery of the filter pack shall be continuously bonded to the inside of the enclosing frame thus eliminating the possibility of air bypass. The enclosing frame shall be equipped with protective diagonal support members on both the air entering and air exit sides of the filters. e. The unit manufacturer shall provide front access filter frames or factory fabricated and assembled. The units shall be constructed of not less than 16 gauge galvanized steel. They shall incorporate, extruded aluminum tracks and individual universal holding frames designed to accommodate the filters specified hereinbefore. Provide for front access to filters with clips to hold filters in place.

M. Provide filter gauges for each filter as follows:

1. Dwyer Magnahelic Type 2003 AF dry air filter gauge, with scale of 0 to 2" across filter, with appropriate static pressure tips, vent valves, and tubing with flag suitably marked to indicate need to change filter.

N. Motorized Control and Smoke Dampers

1. Dampers shall be UL555S rated as manufactured by Prefco Inc. or approved equal. 2. Leakage characteristics shall be based upon test procedures per AMCA Standard 500 that shows air leakage at 6 cfm per sq. ft. at 4" wg differential pressure. Dampers shall be suitable for 9" w.c. static pressure and 6000 FPM free velocities. 3. Frames and blades to be minimum 12 ga. (.081") extruded aluminum. Blades to be of single unit design. 4. Provide overlapping blades and seals (not just overlap seals) to assure minimum air leakage. Provide extruded silicone seals fit into a ribbed groove insert in blades with a formed stainless steel, spring steel at the jamb. 5. Rod bearings shall be designed so that there shall be no metal to metal or metal to bearing riding surfaces. Inter connecting linkage to have separate Celcon bearing to eliminate friction in linkage. 6. Blade linkage hardware shall be of non corrosive reinforced material or cadmium plated steel. 7. All dampers shall be parallel blade type.

O. Steam Humidifiers

1. Provide steam separator humidifier with pneumatic modulating control providing full separation ahead of integral steam jacketed control valve that discharges through internal

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steam jacketed drying chamber, silencing chamber and steam jacketed distribution manifold. 2. Humidifier shall receive steam at supply pressure and discharge at atmospheric pressure. Provide inlet strainer and external inverted bucket steam trap. 3. Separating chamber shall disengage and remove water droplets and particulate matter larger than 3 microns when humidifier operates at maximum capacity. 4. Provide integral, parabolic, steam jacketed plug metering valve at supply pressure and temperature. Valve shall have high range abilities to achieve full, accurate modulation of steam flow over entire valve stroke. 5. Internal drying chamber shall receive steam at essentially atmospheric pressure and be jacketed by steam at supply pressure. 6. Silencing chamber shall be steam jacketed and shall use stainless steel silencing medium. 7. Distribution manifolds shall provide uniform distribution over entire length and shall be jacketed by steam at supply pressure. Provide full length stainless steel internal silencing screen. 8. Provide interlocked temperature switch to prevent humidifier from operating before start up condensate is drained. 9. Humidifier shall be by Armstrong (Series 80), Dry Steam or Sarco.

P. (Hot water) (Steam) Unit Heaters

1. Provide (hot water) (steam) unit heaters of horizontal and vertical discharge as shown on Drawings and on schedules. a. Casings shall be heavy gauge steel with welded seams and shall have threaded connections for vertical hanger rods. b. Horizontal heaters shall have adjustable steel discharge louvers. c. Electric motor shall have integral overload protection and shall be mounted away from coil and heated air stream. d. Fan blades shall be aluminum or steel, statically and dynamically balanced at factory. e. Coil shall have seamless copper serpentine tubes and aluminum or soldered copper fins bonded to tubes. Coils shall be tested at 300 psig air pressure without leaks. 2. Hangers and supports shall incorporate vibration and noise isolators. Motor and fan shall be separated from heater by resilient vibration isolators. OSHA approved fan guards shall be provided on heaters. 3. Unit heaters shall be factory assembled for field installation, by Trane, Air therm, Beacon Morris, Buffalo or AAF.

2.48 CENTRAL STATION AIR HANDLING UNITS

A. General Description

1. Fabricate [draw-thru] type air handling units suitable for the scheduled capacities as manufactured by Carrier, McQuay, Trane, York. 2. Fabricate units with a supply fan segment plus accessories, including [cooling coil segment] [heating coil segment] [filter segment] [mixing box segment] [economizer segment] [air blender segment] [face and bypass damper segment][discharge plenum segment] [access segment] [diffuser segment] [return or exhaust air fan segment] [integral face and bypass coil segment] [humidifier segment] [humidifier segment] [sound attenuator segment] [electric heat segment].

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3. Factory fabricate and test air handling units of sizes, capacities, and configuration as indicated and specified. 4. Base performance on sea level conditions. 5. All internal components specified in the air handling unit schedule shall be factory furnished and installed. Unit(s) shall be completely factory assembled. 6. Units shall ship in one (1) piece where possible. Shipping splits can be provided as required for installation. Lifting lugs will be supplied on each side of the split to facilitate rigging and joining of segments. Units requiring field installed gasketing must be assembled under supervision by factory trained and employed personnel from the air unit manufacturer.

B. Casing

1. The entire unit shall be provided with a full length, continuous, base rail channel. Base rail channels will be formed of a minimum of 12 gage galvanized steel. The base channel will have a minimum height of 5 inches for units up to 20,000 cfm and 8 inches for units 20,000 cfm and greater. All major components shall be supported from the base. Integral lifting lugs shall be provided. Units without a complete and continuous base rail will not be acceptable. 2. The unit shall have a frame construction consisting of galvanized steel vertical and horizontal structural members. The frame shall be constructed to permit complete removal of the wall and roof panels without affecting the structural integrity of the unit. 3. All segments shall be double wall and shall be constructed of G90 mill galvanized sheet steel, formed and reinforced to provide a rigid assembly. The exterior casing shall be constructed of a minimum 18 gage galvanized steel. The interior lining shall be a solid lining of a minimum of 20 gage galvanized steel. 4. All access panels shall be completely removable for unit access and removal of components. 5. All panels shall be completely gasketed prior to shipment with a minimum of 1/4" thick and 3/4" wide closed cell neoprene. 6. All panels shall be insulated with 2" 1.5# fiberglass insulation. The panel insulation must be a full 2" (non compressed) throughout the entire unit. Units with less than 2" of insulation in any part of the walls, floor, roof or drain pan shall not be acceptable. The insulation shall meet the flame and smoke generation requirements of NFPA 90A. 7. Any portion of the unit that is not insulated (gaps) or has less than 2" of insulation shall be the responsibility of the contractor to modify. 8. The cooling coil segments shall have a full width, sloped drain pan that extends 8 in. downstream of the coil. If 8 in. downstream of the coil is not provided, an drainpan must be provided in the next unit segment. 9. The cooling coil drain pan shall be sloped to assure positive condensate drainage with connections on both sides. The pan shall be of double wall construction with a stainless steel liner and have a minimum of 2" of insulation (uncompressed). The pan shall have a minimum depth (free-board) of 4 inches. 10. Coils with finned height greater than 48" shall have an intermediate drain pan extending the entire finned length of the coil. Cooling coils in excess of 48" in height shall not be acceptable unless provided with an intermediate drain pan. The intermediate pans shall have drop tubes to guide condensate to the main drain pan. 11. Double wall access doors shall be provided in the fan and filter segments on the coil header side of the unit. Access doors must also be provided in all segments where the removal of sheet metal screws is required for unit access.

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12. Doors shall be of the same thickness and construction as the wall panels. A 3/8" bulb type gasket shall be provided around the entire door perimeter. Industrial style hinges shall permit a complete 180 degree door swing.

C. Fans

1. The supply fan segment shall be equipped with double width double inlet (DWDI) centrifugal type wheels. All fans shall be forward curved (FC) or airfoil (AF) as required for stable operation. 2. Fan and unit performance shall be rated and certified in accordance with ARI Standard 430. All units that are not ARI Certified shall be witness tested at an independent laboratory to assure performance. 3. All airfoil fans shall bear the AMCA Seal. Airfoil fan performance shall be based on tests made in accordance with AMCA standards 210 and comply with the requirements of the AMCA certified ratings program for air and sound. In addition, all airfoil wheels shall comply with AMCA standard 99 2408 69 and 99 2401 82. 4. After the pre balanced fan is installed in the air handler, the entire fan section shall be run balanced at the specified speed to insure smooth and trouble free operation. 5. The return fan segment shall be equipped with double width double inlet (DWDI) centrifugal type wheels. All fans shall be forward curved (FC) or airfoil (AF) as required for stable operation. 6. Fan and fan motor shall be internally mounted and isolated on a full width isolator support channel using 2" springs. The fan discharge shall be connected to the fan cabinet using a flexible connection. The isolator support rail shall be structurally supported from the unit base. Cantilever supports of the isolator support base are unacceptable. 7. Variable inlet vanes for airfoil wheels shall be an integral part of the inlet cone and constructed of heavy gage, corrosive resistant blades with zinc-plated steel inter-locking and operating mechanism. Both inlet vanes must operate from a single shaft and be synchronized for precise control. 8. The forward curved wheel shall have variable inlet vanes attached to the scroll of the fan. The support ring shall be rolled angle iron. The blades shall be heavy gage galvanized steel. Both inlet vanes must operate from a single shaft and be synchronized for precise control.

D. Bearings and Drives

1. Fan bearings shall be self aligning, pillow block or flanged type regreaseable ball bearings and shall be designed for an average life (L50) of at least 200,000 hours. All bearings shall be factory lubricated and equipped with grease fittings/lube lines extended to the motor side of the fan. 2. Fan drives shall be selected for a 1.5 service factor and anti static belts shall be furnished. All drives (up to 15 HP) shall be adjustable pitch. 3. Fan shafts shall be selected to operate well below the first critical speed and each shaft shall be factory coated after assembly with an anti-corrosion coating.

E. Electrical Characteristics and Components

1. Fan motors shall be NEMA design ball bearing type with electrical characteristics and horsepower as specified on the schedule. Motors shall be 1800 RPM, open drip proof type. 2. All motors shall be high efficiency.

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3. The motor shall be mounted on the same isolation base as the fan. The motor shall be on an adjustable base. 4. If MCC’s are not part of this project, the AHU manufacturer shall furnish, install and wire VFD’s in accordance with those specifications for VAV systems.

F. Coils

1. Cooling and/or heating coils shall be furnished to meet the performance requirements set forth in the schedule. All coils shall have performance certified in accordance with ARI Standard 410. 2. Water coils shall be counter flow. Water velocities shall not to exceed 7 feet per second and/or exceed the water pressure drops scheduled. All coil connections shall be on the same side. 3. Drainable Water coils shall be designed to operate at 250 psig design working pressure and up to 300F and shall be tested with 325 psig compressed air under water. All vent and drain connections shall be extended to the outside of the unit casing. 4. Water and DX coils shall be 5/8" O.D. copper tube, staggered in direction of airflow. Tubes shall be mechanically expanded. The tubes shall have a minimum tube wall thickness of 0.020". Extended surface shall consist of aluminum fins with a minimum thickness of 0.006". Units that require dis-assembly of the unit for coil removal shall include a coil with a minimum tube wall thickness of 0.035 and a minimum fin thickness of 0.009. 5. Direct Expansion coils (DX) shall be designed to conform to ANSI B9.1 (Safety Code for Mechanical Refrigeration) when operating with a refrigerant pressure not exceeding 250 psig. Coil shall be tested to 325 psig compressed air under water. The completed coil shall be dehydrated and sealed for shipment. Each coil shall be furnished with a brass distributor with solder-type connections. Suction and discharge connections shall be on the same side. 6. Steam Distributing coils shall be designed for 100 psig pressure and a corresponding steam temperature of 338F. Coils shall be tested with 315 psig compressed air under water. The outer tubes shall be 1” O.D. with the inner distribution tube 5/8” O.D. The circuiting shall be non-trapping condensate design. The steam shall discharge in the direction of condensate flow. The tubes shall have a minimum tube wall thickness of 0.035". Extended surface shall consist of aluminum fins with a minimum thickness of 0.008". 7. All coils shall be installed on tracks for easy removal from the air handling unit. 8. Headers shall be of heavy seamless copper tubing, silver-brazed to tubes. Connections shall be of red brass, with male pipe threads, silver-brazed to the headers. A 1/4" FPT, plugged, vent or drain tap will be provided on each connection. 9. Coil casing to be constructed of 16 gage galvanized steel Intermediate casing supports shall be supplied for finned lengths that exceed 60". 10. Coil grommets shall be provided on all coils to completely seal the area between the coil connection and the unit casing. 11. Integral Face and Bypass Coils shall be factory supplied and installed. Coils shall be as manufactured by the L.J. Wing Company. 12. Each coil shall consist of a built-in series of finned heating elements and passes with interlocking dampers. Dampers shall be controlled by electric [pneumatic] damper motor and air-stream thermostat. 13. Dampers shall be 16 gauge, roll-formed steel with air-dried enamel finish. The coil casing shall be 14 gauge galvanized steel with rigid framework, completely painted. Coils shall be factory tested at 200 psig steam and 500 psig hydrostatic pressure.

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14. Electric heat of capacity, voltage and steps of control specified shall be provided as an integral part of the unit. Field installed segments shall not be acceptable. The electric heater and control panel shall be a U.L. listed electric duct heater. 15. All electric heater elements shall be of 80% nickel and 20% chrome. Coil elements shall float freely in ceramic bushings which are stacked in support brackets, not exceeding 3.5 inches apart. Coils shall be machine crimped into stainless steel terminals which are insulated with high temperature ceramic Insulators. Heater casing and support brackets shall be of galvanized steel. 16. All electric heaters will be supplied with internal wiring of controls, contactors, etc. including 120-volt, 60 hertz control circuit transformer, automatic reset thermal cut-out and fuses per NEC and UL (on heaters exceeding 48 amps).

G. Filters

1. Flat Filter Segments shall accommodate 2 inch media. Media shall be 30% pleated type. 2. Angle Filter Segments shall accommodate 2 inch media. Media shall be 30% pleated type. 3. Rigid Filter Segments shall accommodate 2 inch prefilters and high efficiency rigid filters of the specified efficiency. Filter frames shall be provided with neoprene gasketing on the leaving air side of the filter. 4. Rigid filter media shall be 12 inches deep and the efficiency shall be a minimum of 95% as determined by ASHRAE Standard 52 76. Filter media shall be listed Class 2 under U.L. Standard 900. 5. Carbon filter segment shall include a side access housing which is an integral part of the air handling unit. It shall be factory fabricated and assembled of 16 gauge galvanized steel tracks and frames. The housing shall include a door for side service. A 2" Pre-Filter track and a 2" Post Filter (dusting filter) track shall be include as an integral part of the segment. Housing shall accommodate 2" deep rechargeable or disposable, panels with 60% activity carbon. The system shall be designed for a minimum contact efficiency of 99% with a residence time of at least 0.08 seconds. 6. Disposable carbon panels shall be constructed of an inner honeycomb separator; corrugated paper, phenolic impregnated for moisture resistance. The honeycomb shall be encased with a 24 gauge Electro Tin Plated frame. A 18 mesh PVC coated fiberglass screen shall retain the carbon within the frame. The panels are completely disposable. 7. The carbon panels shall incorporate 60% CCL4 (Carbon tetra chloride) activity 4 X 6 mesh virgin coconut shell carbon in a 0.47 - 0.51 g/cc packing density. 8. Bag Filter Segments shall accommodate 2 inch prefilters and high efficiency bag filters of the specified efficiency. Filter frames shall be provided with neoprene gasketing on the leaving air side of the bag filter for pressure sealing assembly. 9. Bag filter media shall be 21 inches deep and the efficiency shall be a minimum of 95% as determined by ASHRAE Standard 52 76. Filter media shall be listed Class 2 under U.L. Standard 900. 10. Absolute-HEPA filter segments shall accommodate Absolute-HEPA type filters. 11. HEPA filter media shall be 12 inches deep and the efficiency shall be a minimum of 99.97% [99.99%], as determined by ASHRAE Standard 52-76. Filter media shall be listed Class 2 [Class 1] in accordance with U.L. Standard 900. 12. The filters shall be sealed against the filter frame with spring-loaded, nut and clip assemblies to prevent air bypassing around the filter. 13. A magnahelic, differential pressure gage shall be factory installed and flush mounted on drive side to measure the pressure drop across the filters.

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H. Appurtenances

1. The Combination Filter/Mixing Box shall combine the filtering and mixing functions in one standard segment. Filter media shall be arranged in an angle configuration and shall be provided as 2", 30% pleated type. 2. The segment shall have a hinged access door on the drive side of the unit. 3. The access segment shall be 12", 18" or 24" in depth. 4. The Air Blender Segment shall have factory installed air blenders as an integral part of the air handling unit. Blenders shall be integrated into the overall unit design to maximize the performance of the downstream components. The blenders shall be fixed devices, with no moving parts.

I. Dampers

1. Dampers shall be of low leak design having stamped 16 gage galvanized steel blades. The damper blades shall be provided with a PVC coated polyester fabric mechanically locked into the blade edge. The jamb is a flexible metal, compression type. Leakage shall not exceed 7.20 CFM/square foot at 1" w.g. and 14.5 CFM/square foot at 4" w.g. The blades shall be parallel acting.

2.49 VARIABLE VOLUME TERMINAL UNITS (NON-FAN POWERED)

A. Provide single duct variable volume air control assemblies of sizes and capacities shown on Drawings. Acceptable manufacturers shall be: Titus, Envirotech, Trane, Metallaire. Units shall be 24 gauge galvanized steel, lined with 1 1/2 pound insulation as required by UL 181 and NFPA 90A.

1. Provide damper motor suitable for pneumatic control. 2. Responsibility for the provision of damper actuator, DDC VAV box controller including velocity pressure transducer and control transformer shall be under the Automatic Temperature Controls paragraph of this specification. Terminal box manufacturer shall include with his bid, costs of mounting the controller on his box and piping the controller's transducer to his flow sensor (in accordance with control manufacturers instructions).

B. Provide 3' long sound attenuators where indicated on the Drawings.

C. Boxes shall have multipoint averaging type airflow sensors. Boxes with single point sensors are unacceptable.

D. Assemblies shall be pressure independent between supply unit's external static pressure and minimum static pressure schedule on Drawings. Valves shall be normally open or normally closed as shown on Schedules. Differential static of complete assembly shall not exceed 0.45" wg for units with sound attenuators nor 0.20" wg for units without. Damper leak rate shall not exceed 2% of full volume at 3" static pressure rated by ADC. Units shall not deviate from set minimum or maximum flow settings by more than 10% regardless of inlet angle. Inlet velocities shall not exceed 2250 fpm.

E. Sound ratings shall not exceed noise criteria NC 30 level unless otherwise scheduled on the Drawings. All NC data must be in accordance with ADC 1062 R4. Discharge NC data shall

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include 10db room attenuation only. Radiated NC data is to assume a ceiling with sound transmission class 35 39.

F. Terminal units shall be capable of the heating and cooling operation sequences and quantities shown on the schedule, plan and control drawings. Units' control apparatus shall be compatible with the control system.

G. The mechanical division contractor shall have complete responsibility for ensuring that the submitted terminal box and VAV DDC controller are compatible with each other, and that they can perform all sequences of operation shown on the control drawings. Contractor shall submit the following items with his shop drawing submittal:

1. The name of the terminal box manufacturer. 2. The name of the temperature controls manufacturer. 3. A statement that the mechanical division contractor has contacted both vendors and verified that the terminal box and DDC controller are compatible with each other.

H. Provide (hot water) (electric) heating coils as indicated on drawings.

2.50 VARIABLE VOLUME TERMINAL UNITS (FAN POWERED)

A. Provide pressure independent series, constant volume (with variable primary air) fan terminal boxes as shown on Drawings with sensors, controllers, actuators, casings, motors, dampers, fan sections and filter sections. Acceptable manufacturers shall be Titus, Envirotech, Anemostat, Metalaire, Redd-I, or Trane. Provide single point electrical power connection for entire terminal unit assembly. Provide unit disconnect switch.

B. Provide multi point averaging type airflow sensors, boxes with single point sensors shall be unacceptable.

C. Casings shall be 22 gauge galvanized steel lined internally with 1" 1 1/2 lb/cf fibrous glass insulation that meets UL 181 and NFPA 90A requirements.

D. Damper shall be heavy gauge blades pivoting in Delrin self lubricating bearings. Provide closed cell foam gasketed stops. Leakage shall be less than 2% at 3" sp (ADC Test Code 1062 R4).

E. Fan section shall comprise with direct drive permanent split capacitor motor, with rubber in shear vibration isolation and access panel. Control shall be isolated from air flow in NEMA 1 cabinet. Motors shall have permanently lubricated or ball bearings.

F. Provide SCR type electronic variable speed controller. Controller shall have a manual minimum stop to prevent fan volume from being turned down to the point where the fan stalls and the motor overheats.

G. Controls and Performance

1. Provide factory calibrated pneumatic controller compatible with thermostat supplied by ATC contractor. Controller shall operate pneumatic damper actuator over operating range.

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2. Pneumatic actuator shall have 5 10 psi spring range. Calibrate and set for minimum and maximum cfm rated scheduled. Provide external gauge taps and indexed dial on controller. Controller compressed air consumption shall not exceed 1.2 scfh at 20 psig. 3. Units shall operate with one pipe and two pipe thermostats. 4. Sequence of operation shall be as shown on Drawings. 5. Responsibility for the provision of damper actuator, DDC VAV box controller including velocity pressure transducer and control transformer shall be under the Automatic Temperature Controls paragraph of this specification. Terminal box manufacturer shall include with his bid, cost of mounting the controller on his box, piping the controller's transducer to his flow sensor and wiring between the box controller and the fan and coil contactors (in accordance with controls manufacturers instructions).

H. Filter section shall be integral frame and disposable flat blanket medium. Provide spare filters.

I. Maximum NC ratings shall be 35 discharge, 39 radiated. Values are based on 10 dB room absorption. Discharge rating is for 10" 10 foot long lined duct and single outlet handling scheduled percentage of total air, for third octave band (250 Hz). Radiated rating is for ceiling mounting, ceiling transmission class 35 39.

J. Maximum inlet velocity at box inlet shall be 2000 fpm.

K. The mechanical division contractor shall have complete responsibility for ensuring that the submitted terminal box and VAV DDC controller are compatible with each other, and that they can perform all sequences of operation shown on the control drawings. Contractor shall submit the following items with his shop drawing submittal:

1. The name of the terminal box manufacturer. 2. The name of the temperature controls manufacturer. 3. A statement that the mechanical division contractor has contacted both vendors and verified that the terminal box and DDC controller are compatible with each other.

2.51 UNIT VENTILATORS

A. General

1. Provide unit ventilators of number, size and capacity indicated on Schedule, in accordance with manufacturer's instructions. Air delivery of units shall be in terms of cfm standard air. 2. Unit shall be capable of delivering room air or outdoor air up to rated capacity. Unit shall be capable of being set to deliver minimum of 33% outdoor air. Unit shall be capable of automatically providing room air and predetermined quantity of outdoor air or up to rated capacity of outdoor air, as required by thermal needs of room.

B. Cabinet and Chassis

1. Unit chassis shall be 3/16" to 18 gauge, die formed steel all welded. All welded assemblies and fabricated parts shall receive 5 stage phosphatizing treatment and internal components shall be dipped full depth in prime coat enamel prior to baking. Unit shall have inner casing so that removal of front panel (bottom panel on ceiling model) shall not affect unit operation.

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2. Provide leveling adjustment screws. 3. Five fan models shall have front divided vertically into two sections for additional convenience. Front shall be held in place by concealed, Allen wrench operated 1/4 turn fasteners carefully camouflaged in shadow line recess. 4. Unit discharge grille shall be continuous fabricated steel constructed of round edged steel bars to provide 15°vertical deflection and finished to match top surface. Provide adjustable discharge fans beneath grille. 5. Unit top shall have alignment pins to ensure correct alignment with matching cabinets. Unit shall have top surface finish selected by Designer. Finish color of unit front and end panels shall be beige.

C. Fans and Motor

1. Unit shall be of draw through modular fan construction with each fan delivering 250 cfm standard air. Fan housings shall be constructed with trapezoidal outlets for reduced sound level. Fans and housings shall be steel. 2. Fan and motor assemblies shall be direct drive. Fans shall be on discharge air side of coil, mounted on 1 1/4" hollow steel shaft with full size sleeve type end bearing. Shaft shall be connected through flexible coupling to multi speed, permanent split capacitor motor in unit end compartment out of unit air stream. Motor and fan rotating element shall be isolated from unit with neoprene rubber mounts. Motors on ceiling models shall be permanently lubricated, ball bearing. 3. Motor shall be designed specifically for unit ventilator operation and shall be auto transformer connected for 20% adjustment of rated speed to meet individual system requirements. Motor shall be interchangeable regardless of unit size. Removal and replacement of motor shall not require removing or replacing fans. Motor cord shall have polarized male plug. 4. Provide spare motor for each size and furnish. If unit design is such that entire fan and motor board assembly must be removed in order to replace motor, furnish spare fan and motor board assembly for each size and type.

D. Dampers

1. Provide outdoor air damper and recirculating (room) air damper. Recirculating air damper shall be counter balanced against back pressure to close by wind pressure from outdoor air; no additional device shall be required to positively prevent outdoor air from entering conditioned space. Provide mohair seals at both sides and along damper edges. Dampers shall pivot on self lubricating nylon bearings and shall be interconnected to permit use of ASHRAE cycles of operation: I, II or III. 2. Unit shall be furnished with one piece, insulated face and bypass damper to control air movement through or around heating coil. Damper shall be double sheathed and shall contain dead air space. Provide baffles between fan scrolls to prevent mixing of bypassed air with air in contact with coil. Damper assembly shall be removable in one piece.

E. Coils

1. Coils shall be designed for draw through air flow and shall be located on entering air side of fan section for protection against damage by foreign objects inserted through discharge grille. Coils shall have copper tubes and aluminum fins which shall be continuous across tubes. Joints shall be brazed with high temperature, corrosion resistant alloy.

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2. Coils shall be minimum two rows deep, 4 pass serpentine. Tubes and return bends shall be 3/8" OD. Provide copper headers with provision for installation of 1/8" NPT vent and drain. Supply and return shall be on same end.

F. Filters: Filter shall be 1" disposable, handling total volume of unit on complete recirculation, complete outdoor air or mixture of both. Provide 2 sets of spare filters for each unit.

G. Outdoor Air Intake Louver

1. Provide intake louver by manufacturers listed as acceptable in this specification. 2. Intake louver shall be horizontal chevron 16 gauge aluminum blades in 12 gauge aluminum frame. Intake louver shall be demountable so that complete blade assembly may be removed from frame. ½" square mesh galvanized screen shall be furnished on interior side of intake louver. Color shall be as selected by Designer.

H. Controls

1. Controls shall be factory mounted. 2. Unit shall have electric damper actuator which positions dampers and controls heating output of unit. 3. Actuator shall respond to demands of solid state thermostat which sense room air. Solid state sensor shall be located within sampling chamber in unit. 4. Unit mounted discharge sensor shall be included to prevent discharge air temperature from becoming too low. 5. Control package shall provide ASHRAE II Cycle of Control during heating and ventilation cycle. 6. Fixed minimum outside air percentage shall be 33 1/3% unless otherwise indicated. 7. Night (unoccupied) setback shall be accomplished manually by thermostat installed in remote location. 8. Remote thermostat's function shall be to energize or de energize 120 volt control circuit which operates unit mounted relay provided by manufacturer in each unit control box. 120 V control circuit shall be de energized by time clock during unoccupied periods and energized during occupied periods. 9. Units shall provide convective heat during unoccupied period. When convective heat is insufficient, night thermostat shall turn on fan motor. 10. 1No outside air shall be admitted during unoccupied cycle. 11. 1Control box shall have lockable or tamper proof cover.

I. Unit shall be by AAF, Trane, McQuay.

2.52 HOT WATER (STEAM) CABINET HEATERS

A. Provide (hot water) (steam) cabinet heaters where shown on Drawings and on schedules. Cabinet heaters shall be factory assembled for field installation. Cabinets shall be 18 gauge steel with corrosion resistant finish. Color selection shall be by Designer.

B. Coils shall have seamless copper serpentine tubes and aluminum or copper fins bonded to tubes. Coils shall be tested at 200 psig air pressure without leaks.

C. Provide cabinet heaters with tamper proof front panel screws and key latches.

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D. Filters shall be cleanable, all aluminum.

E. Filters shall be disposable.

F. Provide factory mounted disconnect switch.

G. Cabinet heaters shall be by Sterling, Trane, McQuay, AAF, Airtherm, or Beacon Morris.

2.53 ELECTRIC CABINET HEATERS

A. Provide electric cabinet heaters where shown on Drawings and on schedules. Cabinet heaters shall be factory assembled for field installation. Cabinets shall be 16 gauge steel with corrosion resistant finish. Color selection shall be by Designer.

B. Heating coils shall be single terminal end long life electric fin tube with brazed helical coiled fins.

C. Provide cabinet heaters with automatic reset thermal overload protector.

D. Provide integral thermostats.

E. Filters shall be disposable.

F. Cabinet heaters shall be by Q Mark, Brasch or Trane.

2.54 (HOT WATER) (STEAM) UNIT HEATERS

A. Provide (hot water) (steam) unit heaters of (horizontal) (vertical) discharge as shown on Drawings and on schedules.

1. Casings shall be heavy gauge steel with welded seams and shall have threaded connections for vertical hanger rods. 2. Horizontal heaters shall have adjustable steel discharge louvers. 3. Electric motor shall have integral overload protection and shall be mounted away from coil and heated air stream. 4. Fan blades shall be aluminum or steel, statically and dynamically balanced at factory. 5. Coil shall have seamless copper serpentine tubes and aluminum or soldered copper fins bonded to tubes. Coils shall be tested at 300 psig air pressure without leaks.

B. Hangers and supports shall incorporate vibration and noise isolators. Motor and fan shall be separated from heater by resilient vibration isolators. OSHA approved fan guards shall be provided on heaters.

C. Unit heaters shall be factory assembled for field installation, by Sterling, Trane, Air therm, Beacon Morris, Buffalo or AAF.

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2.55 ELECTRIC UNIT HEATERS

A. Provide electric unit heaters of horizontal discharge type, by Q Mark, Markel, Brasch or Trane, as shown on Drawings and on schedules.

B. Casings shall be heavy gauge steel with mounting bracket.

C. Horizontal heaters shall have adjustable steel discharge louvers.

D. Electric motor shall have integral overload protection and shall be equipped with combination fan guard/motor support resiliently mounted to absorb motor vibration.

E. Fan blades shall be aluminum directly connected to fan motor and shall be dynamically balanced.

F. Fan switching shall be available to operate fan independently for summer circulation.

G. Automatic reset thermal overheat protection shall be wired for instantaneous pilot operation of built in control contactor holding coil.

2.56 GAS UNIT HEATERS

A. Provide AGA certified gas unit heaters with gravity venting, of capacities and in locations shown on Drawings, by Hastings, Reznor, or Trane.

B. Provide the following:

1. Aluminized steel heat exchanger and burner. 2. Connection to 24 volt thermostat, including transformer, automatic gas valve, pilot line filter, pressure regulator, pilot shutoff and manual shutoff. 3. Baked on enamel finish. 4. Horizontal and vertical directional louvers. 5. Totally enclosed fan motor. 6. Safety fan guard. 7. Draft diverter. 8. Fan delay switch. 9. Burner air shutters. 10. 1Electric ignition intermittent gas pilot system.

2.57 FIN TUBE CONVECTORS

A. Provide free standing hot water convectors with sloping top of type as scheduled on Drawings, by American Air Filter, Trane, Standard, Sterling, TRT, or Dunham Bush.

B. Heating element shall consist of 1/2” O.D. round seamless copper tubes expanded into aluminum fins with 1 1/4" seamless steel headers. Provide flanged collars to space equally. Tubes shall be brazed to header with silver solder. Fin and tube assembly shall be encased in steel frame with stiffeners.

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C. Cabinets shall be suitably braced and reinforced 18 gauge steel with heating element supports that provide for adjustment up to 1" in either direction as required by piping arrangement. Cabinet shall be phosphatized with factory baked finish; color and type shall be selected by Designer. Grilles shall be die formed with pencil proof louvers.

D. Provide tamper proof key knob on damper and two flush mounted access doors on each unit.

2.58 FIN TUBE RADIATION

A. Provide hot water fin tube heating elements and enclosures, where, and of capacities shown on Drawings, by Slant Fin, Vulcan, Standard, Sterling, Trane, TRT or Dunham Bush.

B. Heating elements shall consist of 0.012" thick aluminum plate fins permanently bonded to seamless copper tube and guaranteed for working pressure at 300°F of 150 psi for 1" tube. Fins shall be bonded to copper tube by mechanical expansion.

C. Enclosures shall be galvanized steel with 18 gauge front panel.

D. Provide end trims with roll flanged edges between ends of enclosures and walls on wall to wall applications, attached without visible fasteners and flush with enclosures.

E. Enclosure brackets and element hangers shall be no farther than 4 ft. apart. Brackets shall be die formed from 16 gauge stock, 1 1/2" wide.

1. Secure enclosures to brackets with set screws operated from beneath enclosures. 2. Insert brackets in prepunched slots in mounting channel to ensure correct alignment and secure to wall at bottom. 3. Support heating element with sliding saddles and provide positive positioning of element in enclosure. Fins shall not impinge on brackets or enclosure joints during expansion or contraction. 4. Element supports shall be 16 gauge galvanized steel. Saddle shall slide freely on saddle support arm bolted to support bracket. a. Support arm shall allow 1 1/2" height adjustment. b. Element support saddle shall allow 1 5/8" lateral movement. 5. Provide tamper proof modulating output control damper.

F. Provide hinged access doors with tamper proof operators.

G. Provide expansion compensators every 20 ft. on straight runs.

2.59 COMMERCIAL FIN TUBE BARE ELEMENT

A. Provide fin tube element of size and capacity listed in Schedule where shown on Drawings. Tube shall be 1 1/4", schedule 40 steel pipe. Fins shall be 4 1/4" x 4 1/4" steel spaced 32 per foot. Provide tongue and groove collars that interlock with next fin.

B. Fin tube element shall be by Slant Fin, Sterling, Standard, Trane or Vulcan.

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2.60 ELECTRIC HEAT PIPE TRACE

A. Provide electric heating cables on piping exposed to weather and as indicated on the drawings and/or required by job conditions, from point where the piping becomes exposed form building to equipment served.

B. Heat cable shall be installed according to the manufacturer’s recommendations to prevent freezing down to -30°F.

C. Electric heating cables shall be Chromalox Type RT, Thermon or TPE, with watertight thermostat and contactors suitable for the available electrical characteristics. Provide with weatherproof disconnect switch. Verify voltage with Electrical Contractor prior to ordering and installation.

D. Electric heating cables shall be complete with all necessary appurtenances for the complete installation and normal operation of the cables. Provide heat transfer foil, Chromalox Type HTF, Thermon or TPI, to improve the heat transfer characteristics and also prohibit the possibility of insulation coming between pipe and cables causing short circuits. Insulate piping as specified. Provide weatherproof and vandalproof metal jacket to protect exposed piping.

E. Thermostat, interlocking wiring and disconnect switch, except for power connection, shall be provided by the HVAC Contractor for a complete and operable system.

2.61 EMERGENCY GENERATOR SPECIALTIES

A. Install equipment furnished by Electrical Trade Contractor, such as, mufflers, flexible connectors, fuel oil solenoid valves, day tank and accessories, as indicated on the HVAC and Electrical Drawings and specified hereinbefore. Coordinate installation and component requirements with the Electrical trade Contractor and generator manufacturer.

B. Provide for the emergency generator(s), engine exhaust pipes of size as shown on the Drawings and complete oil piping from exterior of building to day tanks and generators. Provide all other oil valves and safety devices as required by Code, except for solenoid valve, which will be furnished by generator manufacturer.

C. Materials for pipe and fittings, gaskets, flanges, etc., shall be as specified hereinbefore and shall be of type to withstand the pressure and temperatures of the system.

D. For exact quantity, weight, size, etc., of accessories and equipment furnished by the Electrical Trade Contractor and installed under this Section, see Electrical Drawings and coordinate with Electrical Trade Contractor and generator manufacturer.

E. Engine exhaust piping shall be supported with spring vibration isolators throughout. Provide suitable expansion compensator arrangements for the horizontal and vertical exhaust pipes. Compensator shall be sized and installed per generator manufacturer requirements, after Electrical Trade Contractor has purchased the unit. Generator exhaust pipe shall be insulated and where exposed to weather, shall be protected with weatherproof jacket.

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2.62 STEAM HEATING COILS

A. Provide non freeze tube in tube steam distributing coils.

B. Tubes shall be 1" outside diameter copper tubing expanded mechanically into helically wound aluminum fins. Casing shall be galvanized steel, drilled for bolting. Headers shall be steel with external pipe threads. Tubes shall be brazed to header. Supply and return connections shall be on same end of coil.

C. Leak test at 250 psi air pressure.

D. Coils shall be by Aerofin (Type A), Trane, Carrier, McQuay, or York.

2.63 HOT WATER COILS

A. Provide hot water coils suitable for duct installation with capacities, pressure drops and leaving air temperatures as shown on Drawings. Acceptable manufacturers shall be Aerofin, Carrier, McQuay, York, or Trane.

B. Coil shall be ½" or 5/8" copper tube expanded mechanically into continuous aluminum fin collars, with copper or bronze headers and galvanized steel casings.

C. Proof test at 300 psi and leak test at 250 psi air pressure under water. Certify suitability for 200 psi working pressure.

D. Coil shall meet requirements of ARI 410 74.

2.64 (CHILLED WATER) (GLYCOL/WATER) COILS

A. Provide (chilled water) (glycol/water) coil removable from connection side of casing and supported in tracks over entire length of coil. Coils shall be aluminum corrugated plate fins on 5/8" or ½" OD staggered copper tubes. Fins shall have belled collars and shall be bonded to tubes by mechanical expansion.

B. Provide hot dipped galvanized steel casings and steel headers.

C. Certify suitability for psig working pressure at °F.

D. Test at air pressure of psig submerged in water. Coils shall be drainable and shall have non trapping circuits.

E. Coils shall meet requirements of the latest edition of ARI 410. Acceptable manufacturers shall be Aerofin, Carrier, McQuay, York, or Trane.

2.65 ELECTRIC HEATING COILS

A. Provide electric heating coils, where shown on Drawings, of capacity and type indicated in schedule. Heaters shall be Indeeco, Warren, Brasch, Redd I, Titus or Envirotech. Coils shall be UL listed and shall meet requirements of National Electrical Code.

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B. Electric heaters open coils shall be Grade A resistance wire (80% nickel, 20% chromium), insulated with floating ceramic bushings, in aluminized steel frame.

C. Provide insert heater casing.

D. Ceramic bushings shall be recessed into openings in aluminized steel brackets and staked in place.

E. Weld brackets to aluminized steel frame on 3 1/3" centers.

F. Terminal studs, nuts and washers shall be stainless steel, insulated with phenolic terminal bushings. Terminals shall be machine crimped to coils.

G. Heater shall be suitable for zero clearance to combustible surface.

H. Heater shall be tested dielectrically at 2000 Volts before shipment.

I. Provide differential pressure air flow switch with remote mounting sensor to de energize heater on lack of air flow. Install sensor upstream of volume box.

J. Provide built in automatic reset thermal cutout to break heater load directly upon over temperature.

K. Provide built in manual reset thermal cutout.

L. Thermal safety cutout's sensing elements shall project fully into the moving air stream. The cutouts shall not be subject to nuisance local overheating due to inadequate air flow. Provide recessed cabinets or other means recommended by the manufacturer, to ensure that nuisance tripouts do not occur.

M. Provide dry control circuit transformer in heater terminal box, suitable for industrial applications.

N. Insulate terminal box 1" semi rigid fibrous glass boards sandwiched between two pieces of sheet metal at base of terminal box.

O. Provide remote control panels as indicated on Drawings.

2.66 SHELL AND TUBE HEAT EXCHANGERS

A. Provide shell and tube heat exchangers of quantities and capacities scheduled and shown on Drawings, by Taco, Amtrol, Bell and Gossett, or Patterson Kelly.

B. Construction shall meet requirements of ASME Boiler and Pressure Vessel Code (Section VIII), American Water Works Association, and NEMA Standards.

C. Tube and shell heat exchanger shall have removable U tube bundle.

D. Shell and baffles shall be steel. Tubes shall be 3/4" OD copper. Head and tube sheets shall be cast iron or steel.

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E. Provide mounting saddle.

F. Provide proper vacuum breaker and/or vent as required.

2.67 PLATE AND FRAME HEAT EXCHANGERS

A. Provide plate and frame heat exchanger of capacity and pressure rating scheduled and shown on Drawings by Alfa Laval, Tranter, American Vicarb or Mueller.

B. Construction shall meet requirements of ASME Boiler and Pressure Vessel Code (Section VIII), American Water Works Association, and NEMA Standards.

C. Plates shall be 316 stainless steel. Gaskets shall be nitrile or resin cured butyl rubber. Closing bolts shall be stainless steel.

2.68 FUEL OIL TRANSFER PUMP SYSTEM

A. Provide factory assembled, duplex, automatic fuel oil transfer pump system where shown on Drawings, by Preferred Utilities, Hayes, Coen or Peabody to deliver (No. 2 fuel oil) (diesel oil).

B. Structural

1. Provide 1/4" reinforced steel plate, with 3" side rails welded continuously to form 1" overflow lip with ½" drain plug at each end. 2. No bolts shall extend through support base; strainers, pumps and other items shall be bolted to individual steel welded to support base.

C. Piping

1. Provide Schedule 40 black steel piping and malleable iron fittings. Provide line size ball valves by Jenkins or approved equal. Provide relief valve. 2. Valve handles shall be accessible from front of set. Connections to pumps and control devices shall be unions. Pressure sensing devices shall have ball valve shutoffs. Provide check valves at pump discharges. 3. Piping shall meet requirements of Piping Paragraph of this Section unless specified otherwise.

D. Fuel Oil Strainers

1. Strainers shall be union connection duplex with one piece, cast iron bodies, ASTM 48 58 Class 30, hydrostatically tested and suitable for pressures to 125 psig. Strainers shall have clamped covers and removable baskets. 2. Strainers shall be by Preferred Utilities, Annandale or Kraissl. Provide brass baskets with 1/32" perforations.

E. Provide bronze back pressure regulation valves adjustable in field. Coordinate required pressure range of valve with Designer and list range on submittal, pipe to common header for job site connection to oil tank.

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F. Gauges: Gauges shall have 4 1/2" diameter remote reading dial. Mount on 1/4" thick steel plate. Each gauge shall have an engraved phenolic label.

G. Controls

1. Provide 14 gauge, welded, galvanized steel cabinet finished in hammertone grey enamel. Mount on structural support and wire to pump motors. Wiring to generator day tank float switches shall be performed under the work of the mechanical section. 2. Wire pumps to alternate on successive cycles; back up pump shall start automatically in case of malfunction. Provide malfunction warning light. 3. Provide flush mounted start stop pushbuttons and pilot lights on fixed upper panel and wire in cabinet. 4. Mount and wire components as follows within cabinet: a. Starter for pump motor. b. Circuit breaker for pump motor. c. Control circuit fuse. d. Terminal strip for external connections. e. Malfunction warning lights. f. Provide fusible control circuit transformer.

H. Factory Testing

1. Perform hydrostatic test at 150 psig. 2. Provide electric service of proper voltage to cabinet terminal strip for functional testing of components and checking motor rotation. 3. Verify back pressure regulating valves and control settings for conformance to Specifications. 4. Certify factory testing; submit wiring diagram.

I. Painting: After testing, provide shop coat of primer and machinery enamel. Nameplates, gauges, brass valves, shafts and other moving parts shall be masked and left unpainted; paint support base black, control cabinet hammertone grey, and rest of set aluminum.

2.69 FUEL OIL SYSTEM, STEEL TANK

A. Provide fuel oil system consisting of nominal gallon double wall underground tank, valves, strainers, piping, gauge and accessories to provide complete installation suitable for No. 2 oil. System shall meet requirements of NFPA 31. Acceptable manufacturers of fuel oil tanks shall be: Massachusetts Engineering, Buffalo Tank or Adamson. Alternate vendors may be submitted so long as they have been licensed by the Steel Tank Institute of America to apply the ST1 P3 corrosion protection system; for a minimum of 5 years.

B. Underground tank shall be steel; steel thickness and maximum tank diameter shall be as specified in UL Standard 58. Tank and accessories shall bear UL and shall meet requirements of state and local codes. Provide tappings.

CAPACITY IN GALLONS GAUGE to 285 14 286 - 560 12 561 - 1,100 10

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1,101 - 4,000 7 4,001 - 12,000 1/4" 12,001 - 20,000 5/16" 20,001 - 50,000 3/8"

C. Leak Detection System for Double Wall Tanks

1. The Mechanical Division Contractor shall provide an electronic, continuously monitoring leak detection for each double wall fuel oil tank. The mechanical contractor shall be fully responsible for ensuring that all components of the monitoring system are compatible with the submitted fuel oil tank (whether the tank manufacturer supplies the monitoring system or not). The mechanical contractor shall be responsible for all power and control wiring to the detection system. The mechanical contractor shall also be responsible for the provision of all components, whether explicitly listed below or not, for a complete operational system, in accordance with the latest edition of the Massachusetts fire prevention regulations. 2. The system shall be able to detect and alarm within five minutes after the sensors come into contact with the liquids being monitored. The system shall be UL listed; the hazardous locations (Class 1, Division 1, Group D). The system shall be installed in accordance with the manufacturers instructions, the NEC, all Federal, State and local codes as well as authorities having jurisdiction. 3. The system control and display panel shall be mounted on a wall at eye level, in the unless shown otherwise on drawings. The control panel shall display the normal or leaking condition of the tank annular space, and shall be capable of giving both audible and visual alarms in case a leak is detected. 4. The leak detection sensor shall be located within the annular space at the bottom of the tank. The sensor shall be connected to the controller by cabling, which shall be enclosed in conduit suitable for underground application. 5. Double wall tanks shall have fittings such that monitoring cables and sensors can be inserted into tank's annular space.

D. Provide all tanks with a spill containment manhole with a minimum capacity of three gallons, capable of returning fuel oil to the tank.

E. Provide an overfill protection device for the tank. This shall be either (A) a sensor for measuring level of fuel oil in the tank equipped with an audible or visual alarm that is triggered when the tank is full or (B) a device to cause flow into the tank to stop automatically when the tank is full.

F. Provide Steel Tank Institute of Americas (ST1) sti P3 corrosion protection system, fabricated and installed as required by STI. System shall include, but not be limited to:

1. Dielectric coating applied over enter tank surface, after tank surface has been sandblasted. Coating shall be fully tested in accordance with STI instructions. 2. Dielectric bushings or flange isolators, for each tank opening, to isolate tank from connecting steel pipes. 3. Cathodic protection consisting of galvanic anodes and monitoring terminal.

G. Provide Preferred Instruments (TG HY 30) or approved equal remote indicating gauge for wall mounting. Gauge shall be mounted five feet above floor and calibrated in gallons.

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H. Provide for each tank float type level sensor wired to provide audible alarm in mechanical space when tank oil level falls below setpoint. Provide all control wiring.

I. Provide for each tank float type level sensor wired to provide audible alarm in mechanical space when tank oil level falls below setpoint. Provide all control wiring.

J. After installation and before backfilling, go over entire surface of tank with Holiday Detector and re coat damaged areas.

K. Air test fuel oil supply and return piping, at 100 psi and 22" vacuum respectively, for four hours, before connection to fuel oil tank.

L. Provide 2 1/2" conduit for tank gauge tubing. Provide fusible, lever operated valve with manual shut off on suction line inside boiler room. Cover of fill box shall have cast letters that read OIL. Provide 10 micron filter in suction lines.

M. Provide 30 year warranty against corrosion and structural failure.

N. Coordinate and observe installation of fuel oil tank on 6" concrete pad with 6" clean sand between pad and tank, under Section 033000, CAST-IN-PLACE CONCRETE.

O. Provide sufficient fuel for testing and start up of oil fired equipment.

2.70 OPEN CELL COOLING TOWERS

A. General Requirements and Quality Assurance

1. Provide, where shown on drawings, factory assembled and tested, induced draft, vertical discharge cooling towers of capacities as shown on schedules. Acceptable manufacturers shall be: a. Baltimore Aircoil b. Evapco c. Marley 2. Provided they: a. Meet the requirements of this specification b. Meet the performance requirements shown on the schedules with equal or less horsepower than the unit listed in the schedules c. Be of equal or less height and loaded weight to the scheduled tower. 3. ALL Evapco towers must be equipped with a two speed motor or variable frequency drive for EACH fan. Configurations with two single speed fans per cell shall be UNACCEPTABLE. 4. The submitted tower shall fit within the spatial envelope of the tower shown on the drawings. 5. The thermal performance of all cooling towers shall be determined by testing in accordance with Cooling Tower Institute Standard 201. In addition to the guarantee requirements stated in Part One of this specification, the manufacturer of the cooling tower shall guarantee the thermal performance of the cooling tower, stated in the submittal, for a period of one year from the date the tower is accepted by the DCAMM Project Manager. If the tower fails to perform in accordance with the submitted performance data within this period, the tower manufacturer shall repair or replace the

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tower such that the performance criteria are met. This shall be done within the original contract price.

B. Materials of Construction

1. Steel components, including but not limited to the: cold water basin, casing, hot water basin (if provided), fan deck and fan cylinder, shall be G 210 hot dipped galvanized steel. 2. Fill and drift eliminators shall be of self extinguishing PVC with a flame spread of 5 or under, which shall be impervious to rot, fungus and decay. Drift loss shall be 0.005% of circulated water or less. 3. Louvers shall be either extinguishing PVC or fiberglass reinforced polyester. Louvers shall be designed to minimize splashout. Towers less than 30' above grade level shall be provided with hot dipped galvanized air inlet screens unless louvers form an integral screen. 4. Cold water basin shall be self cleaning with depressed center section. Provide drain and overflow connections. Provide anti vortexing device and lift out screen strainer of either hot dipped galvanized or stainless steel. Provide brass float and make up valve. Suction connections shall be as shown on drawings. If cooling tower elevations show weir gates connecting cooling tower sumps, gates must allow one cell's sump to be drained while other sumps remain full of water. 5. Hot water distribution system shall be either: a. Open gravity distribution basin with non clogging plastic metering orifices. Provide flanged connections at each basin with manually operated flow control valves for positive shutoff. If manufacturers standard flow control values are not designed for positive shutoff, provide under the work of the mechanical section, a line size butterfly valve before each flow control valve. See valves paragraph of these specifications for requirements. Provide basin covers. Piping shall not interfere with removal of covers. b. Schedule 40 PVC pipe with ABS anti clogging spray nozzles. PVC pipe shall have a steel connection for attachment to external piping and shall be removable for cleaning. Maximum pressure drop through nozzles shall be 3 PSI. 6. Fans shall be cast aluminum propeller type with either fixed or adjustable pitch blades. Fan drive mechanism shall be either: a. Neoprene polyester belt drive specifically designed for cooling tower service. Fan sheave to be aluminum or cast nylon, motor sheave to be out of the airstream or protected by a vented enclosure. Provide one spare set of belts, for each tower fan, under the original contract price. Provide internal walkway with working platform for towers with motors located inside. b. Right angle, industrial duty, oil lubricated, geared speed reducer equipped with an oil level sight glass. Motor shall be located physically out of moist airstream. 7. Provide external lube lines for components needing lubrication. 8. 1Provide access doors on both ends of cooling towers for access to eliminator and plenum section. Provide all power and control wiring internal for heaters and controls.

C. Electrical

1. Fan motors shall be either TEFC or TEAO. See motor schedules and controls sequences for requirements for two speed and/or reversing motors and starters. Minimum motor service factor shall be 1.15 (submitted tower shall not operate in service factor by design ). Motor insulation shall be designed for cooling tower duty. Minimum shaft bearing life shall be 40,000 hours. Provide heavy gauge, hot dipped galvanized wire fan guard over

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each fan cylinder. Motors shall be high or premium efficiency type. See "Motors and Starters" paragraph of this specification for required efficiencies and other requirements. 2. Provide vibration limit switch to shut off tower in case of excessive vibration. Switch shall have auxiliary contact for remote alarm. 3. Provide, for each tower cell, electric basin heaters, of capacities as shown in the schedules. Heater will maintain sump water at 40°at 0°ambient with a 15MPH wind. Provide sump thermostats for heaters. Provide low water cutouts to de energize heater in case of lack of water in pan. Wire and mount thermostats and cutouts, under the work of the mechanical section. Provide wiring from switch to motor starter and remote alarm under the work of the mechanical section. Provide circuit breakers, contacts and 120 volt control transformer in waterproof (NEMA 4) box. Provide all power and control wiring internal to box and from box to heaters and controls.

D. Coordination

1. Under the work of the mechanical section, install tower on supporting steel structure provided under the work of another section and on vibration isolation rails and isolators provided under the work of the mechanical section (see vibration isolation paragraph of these specifications and tower elevation for specific requirements). 2. Provide under the work of the mechanical section, piping, valves and necessary connection for coldwater makeup and overflow drain. Arrange valves so as to permit draining of valves and piping. 3. Provide under the work of the mechanical section roof sleeves for pipes passing through roof or walls. See pipe sleeves paragraph of these specifications for specific requirements. Caulk and flash penetrations to make watertight joint. 4. Provide under the work of the mechanical section, insulation for all outdoor piping associated with cooling tower. See pipe insulation paragraph of these specifications, for specific requirements. Install insulation after pipes have been heat traced under the work of the electrical section. 5. Piping supports shall be power tower manufacturers recommendations. Coordinate with manufacturer.

E. Ladders and Handrails:

1. Provide railing around top of all cells. Provide access ladder with cage and extension to within 8" of roof. Installation shall be in full compliance with OSHA requirements.

2.71 CLOSED CELL COOLING TOWERS

A. General Requirements and Quality Assurance:

1. Provide, where shown on drawings, closed cell cooling towers(s) of capacity shown on HVAC schedules. Acceptable manufacturers shall be: a. Baltimore Aircoil b. Evapco c. Marley 2. Provided they: a. Meet the requirements of this specification b. Meet the performance requirements shown on the schedules with equal or less horsepower than the unit listed in the schedules

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c. Fit within the space for the tower, shown on the drawings. d. Be of equal or less height and loaded weight to the scheduled tower.

B. The pan and casing shall be constructed of hot dipped galvanized steel. All edges shall be given a protective coat of a zinc rich compound. After fabrication, the units shall be coated externally with zinc chromatized aluminum paint. The pan/fan section shall be located in the dry entering airstream. Provide circular access doors, stainless steel or hot dipped galvanized strainers, waste water bleed line with adjustable valve and brass make up valve, with a plastic float. Provide protective inlet screen for fan casing. Casing shall be factory insulated.

C. Fans shall be forwardly curved centrifugal type of hot dipped galvanized construction. Towers with axial flow fans may be substituted if the total sound power level of the tower is no more than 2 db higher than for a manufacturers tower with identical thermal performance characteristics and a centrifugal fan. Sound data for both types of fans must be included with submittal for the axial flow fan to be considered. Fans shall be statically and dynamically balanced for vibration free operation. Fans shall be mounted on a steel shaft supported by heavy duty, self aligning, relubricatable ball bearings with cast iron housings.

D. Fan motors shall be mounted on an adjustable base, and shall be two speed, drip proof type made suitable for outdoor service, with a 1.15 service factor (submitted tower shall not operate in service factor by design). Drives shall be v belt type, designed for 150% of the motor nameplate horsepower. Provide a protective cover for the fan motor and drive. Fan motor shall be high efficiency type see motor and starter paragraph of these specifications for requirements.

E. The heat transfer coil(s) shall be all prime surface steel, encased in steel framework, with the entire assembly hot dipped galvanized after fabrication. Coil(s) shall be designed with sloping tubes for free drainage of liquid, and shall be tested to 350 PSIG air pressure under water. The heat transfer section(s) shall be removable from the pan.

F. The water distribution system shall distribute water over the coil uniformly at a flow rate of not less than 4.5 gpm/sq. ft. of coil cross section. The system shall consist of a spray header and branches of either hot dipped galvanized steel or schedule 40 PVC. Distribution nozzles shall be plastic with a minimum nozzle size of 3/4"x5/16th". All nozzles and spray branches shall be easily removable for cleaning.

G. Water circulation pump shall be close coupled bronze fitted, centrifugal type with mechanical seals. Provide low water cutout to de energize pump if there is a lack of water in the pan. Pump shall be mounted vertically to allow free drainage on shut down. Provide complete piping to strainer and water distribution systems. Drip proof pump motor shall be suitable for outdoor service.

H. Eliminators shall be either hot dipped galvanized steel or inert PVC which has been specially treated to resist ultra violet light. The eliminators shall be removable in easily handled sections. They shall have a minimum of three changes in air direction and shall incorporate a hooked leading edge to direct discharge away from the fans to minimize recirculation.

I. Provide a factory insulated discharge hood with positive closure dampers. Hood and damper shall be constructed of hot dipped galvanized steel. Hood shall be equipped with access panel to facilitate maintenance on eliminators and water distribution system. Provide 120 VAC damper actuators and linkages. Provide under the work of the mechanical section, whether

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explicitly shown on the controls sequences or not, all necessary controls and wiring to ensure that the hood dampers are fully open before the fan starts.

J. Provide electric immersion pan heaters sized to maintain pan water temperature of 40°F, at 0°ambient with a 15 mph wind. Provide a sump thermostat and a low water cutoff (to de energize heater if there is a lack of water in the pan). Furnish a remote sensing bulb to be field mounted and connected to the sump thermostat under the work of the mechanical section. Any other control wiring shall be performed under the work of the mechanical section. The provider of the work of the mechanical section shall carefully coordinate with the provider of the work of the electrical section. If the heater contactor and power wiring are not shown on the electrical drawings, then they shall become part of the mechanical work, regardless of who does the actual furnishing of components and field installation.

2.72 AIR COOLED WATER CHILLERS

A. General Requirements:

1. Provide where shown on drawings, air cooled water chillers, of capacities as shown on schedules. Acceptable manufacturers providing they meet the requirements of this specification, and the equipment schedules shall be: a. Carrier b. McQuay c. Trane d. York 2. The chiller shown on the drawings has been coordinated with architectural and structural elements, and with electrical service requirements. If a different unit is submitted, ALL mechanical, electrical, architectural and structural modifications which are required shall be performed under the work of the mechanical section, by the mechanical contractor, under the original contract price.

B. Quality Assurance

1. Chiller shall be rated in accordance with the latest edition of ARI Standard 590. 2. Unit construction shall comply with ANSI B9.1 Safety Code, National Electrical Code and applicable ASME Codes. 3. Unit Cabinet shall be capable of withstanding Federal Test Method Standard No. 141 (method 6061) 500 hour salt spray test. 4. Cooler shall be tested and stamped in accordance with ASME Code for a minimum refrigerant working side pressure of 225 PSIG and a minimum water side pressure of 150 PSIG. 5. Air cooled condenser coils shall be leak tested at minimum 150 PSIG and pressure tested at 425 PSIG. 6. Each chiller shall be factory tested at full and part load conditions the current draw shall be noted. Results of the test shall be provided to DCAMM Project Manager. The chiller shall be tested for refrigerant leaks and shipped with a full charge of refrigerant.

C. Equipment

1. Casing

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a. Casing shall be constructed of galvanized steel panels, capable of meeting the salt spray test referenced above. Casing surface shall be phosphatized and painted. 2. Evaporator a. Evaporator shall be shell and tube type with copper tubes expanded into tube sheets. Provide drain connection and wells for temperature and safety controls as required. Provide 3/4" insulation over entire surface of the evaporator; maximum insulation k factor shall be 0.28. Provide heater tapes, and thermostatic controls, to protect evaporator and water piping (to field provided piping). Heat tapes shall protect evaporator to 20 degrees. The mechanical contractor shall coordinate with the electrical section to ensure that heat trace is supplied for all outdoor field supplied water piping. If such trace, and all required controls, have not been provided under the work of the electrical section, they shall be provided by the mechanical contractor under the work of the mechanical section. Field supplied trace will protect piping to 20 degrees. 3. Condenser a. Air cooled condenser coils shall have aluminum fins bonded to copper tubing with integral subcooling circuits. b. Condenser fans shall have three phase motors with three phase overload protection, permanently lubricated ball bearings, and shall be statically and dynamically balanced. Fans shall discharge vertically. c. Provide decorative grilles to provide protection for all interior components. Grilles shall cover all open ends of units. 4. Refrigerant Circuits a. Provide independent refrigerant circuits. Each circuit shall include a liquid line sight glass, liquid line solenoid valve, filter drier, hot gas muffler and thermal expansion valve. b. Manufacturers with electronic expansion valves may submit an alternate unit with the electronic valves so long as the alternate meets all other requirements of this specification. The alternate must list prices and approximate potential energy savings for units with both respective types of expansion valves. 5. Controls a. Unit shall be designed to accept a single point power feed. b. Provide control transformer, starter and refrigeration controls in a weathertight enclosure. The starter section shall contain the main unit power connection, starting contactors, compressor overloads and oil pressure cutouts. The refrigeration controls section shall contain reset relays, compressor service switches, motor protector, high and low pressure controls and the control microprocessor. The microprocessor shall control the compressor anti recycle function, compressor staging, low water temperature cutout, low ambient temperature operation logic and hot gas bypass logic. c. Provide all controls necessary to start and operate the chiller at 0°F. Controls may be modulating damper or fan speed control and shall be activated by sensing refrigerant head pressure. Control systems which are activated exclusively by ambient temperature are unacceptable. d. Provide all valves, piping and other controls necessary for hot gas bypass operation. All components shall be factory installed. e. Provide controls to pump out evaporator when compressor is off. Pump out shall occur at intervals recommended by chiller manufacturer. f. The mechanical contractor, shall provide under the work of the mechanical section, a flow switch to lock out chiller in the absence of evaporator flow as well as all control wiring for it to operate.

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g. Chiller manufacturer shall provide any controls not explicitly listed above, necessary for proper operation of his system. The mechanical contractor shall provide all field control wiring necessary to interface sensors to the chiller control system. Such wiring will be coordinated with the chiller manufacturer and be in strict accordance with manufacturer's instructions and wiring diagrams. 6. Compressors a. Provide hermetic or semi hermetic reciprocating compressors complete with oil pump, crankcase heater, shutoff valves, gauges to monitor suction and discharge pressure (on each refrigerant circuit) and all other controls and components required by the manufacturer for proper operation. Provide rubber in shear or spring type vibration isolation, for compressors. b. Provide a minimum of four steps of capacity control, in response to leaving chilled water temperature, for units 60 tons and under, 6 steps of control for units over 60 tons.

2.73 CENTRIFUGAL CHILLERS

A. General

1. Provide where shown on drawings centrifugal water chillers of capacities shown on equipment schedules. Acceptable manufacturers shall be: a. Carrier b. McQuay c. Trane d. York 2. Provided they meet the requirements of this specification and the requirements of the equipment schedules. Performance data assumes a condenser and evaporator fouling factor of 0.0005.

B. Quality Assurance

1. Chillers and installation shall conform to the requirements of the latest edition of the ANSI/ASHRAE 15 Safety Code. 2. Chiller performance shall be rated in accordance with the latest edition of ARI standard 550. 3. Chillers whose refrigerant or waterside volumes and/or pressures fall within the ranges governed by the ASME Unfired Pressure Vessel Code shall be constructed and factory tested to pressure designated by ASME Code and shall be ASME stamped. 4. The maximum kw/ton of the chiller shall be as listed in the equipment schedule (max. kw E minimum capacity (tons)), or 0.7 kw/ton, as required by the applicable energy code, whichever is less.

C. Products

1. Compressor(s) a. Compressor(s) shall be single or multi stage, serviceable hermetic or open type. Provide inter stage flash economizer(s) for multi stage units. Compressor(s) shall be driven by direct drive or through gears. b. Impellers shall be fully shrouded high strength cast aluminum alloy. Motor shall not operate at greater than 3600 rpm. Impellers shall be statically and dynamically

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balanced and over speed tested for minimum 120% of full speed. Maximum vibration amplitude of 0.1" per second shall be measured on the motor housing. c. Provide thrust bearing with force feed lubrication to position shaft axially under unidirectional thrust loading. Impeller shall be designed so that thrust loading is positive and unidirectional under all operating conditions. d. Provide self aligning, pressure lubricating bearings. 2. Compressor Motors a. Motors shall be single speed, non reversing squirrel cage induction type suitable for voltage shown on drawings. Full load operation shall not exceed nameplate rating. b. Provide load limit control to prevent operation in excess of nameplate continuous operation rating. c. Rotor shaft shall heat treated carbon steel. Operating speed shall be at least 25% less than first critical speed. d. Provide removable sheet metal terminal box. e. Motors shall be fully compatible with the type of starter specified and provided. 3. Lubrication System a. Provide force feed lubrication system with hermetic motor driven oil pump, oil cooler, pressure regulator, oil filters, thermostatically controlled and necessary motor controls. Oil pumps shall be energized prior to chiller motor energization. Oil pump starter shall be factory mounted on chiller and factory wired. b. Provide delayed action controls to maintain oil pressure during machine coast down. 4. Evaporator and Condenser a. Evaporator and condenser shells and water boxes shall be manufactured of carbon steel plates and designed for 150 psig working pressure. Refrigerant side of shell shall be pressure tested to minimum of 1 1/2 times design working pressure. Tests shall be performed with water boxes off, but tubes in place. Refrigerant side shall also be vacuum leak tested and pressure leak tested using refrigerant trace gas. Water side shall be pressure tested to one and one half times design working pressure but not less than 225 psig. b. Provide, as required by ANSI/ASHRAE 15, carbon steel rupture discs or spring loaded relief valves to discharge refrigerant to atmosphere. Mechanical division contractor shall be responsible for piping discharge up through building to atmosphere at an approved location. The location of the piping discharge on roof MUST be approved by Designer before piping is installed. c. Refrigerant temperature thermowell shall be provided for use with low limit controller for evaporator. 1) Thick carbon steel tube sheet shall be welded to each end of shell and shall be drilled and reamed to accommodate tubes. Provide positive liquid and vapor seal between refrigerant and water side of shell after tube rolling. d. Intermediate tube support sheets shall be positioned along length of shell to avoid contact and relative motion between adjacent tubes. e. Individually replaceable, externally finned, seamless copper tubing shall be utilized as heat transfer surface. Tubes shall be finned except where rolled into tube support sheets. f. Tubes shall be mechanically expanded into tube sheets; ensure leak free seal and elimination of tube contact and abrasion due to relative motion.

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g. Tubes shall be removable from either end of heat exchanger without affecting strength and durability of the tube sheet and without causing leakage at adjacent tubes. h. Provide factory installed 3/4" thick closed cell foam insulation having flamespread/smoke developed rating of no greater than 25/50 when tested in accordance with ASTME 84, and having a thermal conductivity not exceeding 0.28 BTUH/in./sq. ft./°F for all cold surfaces including evaporator shell, evaporator water box cover, suction elbow, purge chambers, and for hermetic machines the compressor motor. If chiller manufacturer does not offer factory insulation of above components, the mechanical division contractor shall provide the insulation in the field. i. Water boxes shall have vents, drains and covers to permit tube cleaning within the space shown on the drawings. Suitable tappings shall be provided in water boxes and nozzles for control sensors, gauges and thermometers. 5. Purge and Pump out Systems a. Units with refrigerant under vacuum shall have purge system with devices necessary for evacuating air and water vapor from and for condensing, separating and returning refrigerant to system. Purge unit shall be factory mounted, piped and wired. b. If high pressure (R 12 or R500) refrigerant is used, provide refrigerant storage vessel and pump out compressor outside cooler and condenser, of sufficient capacity that entire charge (of one machine on multi chiller applications) may be transferred to vessel with 20% excess volume remaining in the vessel. Pump out compressor shall be factory installed. If the design of the chiller is such that the entire charge can be transferred to and isolated in the main condenser, then a pump out system is not required. Transfer of the refrigerant charge shall be accomplished by either main compressor operation, migration or gravity flow of refrigerant. Isolation shall be accomplished with tight seal valves located at the entrance or exit of the condenser. The main condenser shall be sized to contain the entire refrigerant charge at 90°F in accordance with the ASHRAE/ANSI 15 Safety Code. 6. Capacity Control a. Unit compressor shall have positive means of capacity modulating down to 10% of full load capacity without experiencing surge or rotating stall conditions or entraining oil when supplied with full load water flow rates. Hot gas bypass control shall not be used for capacity reduction or for stabilizing compressor performance. 1) Capacity modulation shall be accomplished by positioning of inlet guide vanes using complete, fully automatic capacity control system which shall maintain design leaving water temperatures within 1°F total temperature range from 100% to 10% of load. 2) Control system shall automatically stop unit when load falls below 10% and restart unit upon increase in load after time delay. 7. Auxiliary Motors a. Magnetic motor starters, or contactors for motors with inherent protection, shall be furnished, mounted and wired for auxiliary motors. 8. Miscellaneous Items a. Unit manufacturer shall furnish evaporator and condenser water differential pressure switches and appropriate non skid neoprene vibration isolation pads for each unit, for installation by Mechanical Division Contractor.

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b. The mechanical division contractor shall be responsible for the provision of piping valves and fittings for the oil cooler and for any required vent and drain piping. All such work shall be performed in strict accordance with chiller manufacturers instructions. c. The mechanical division contractor shall be responsible for ensuring the compatibility of water box piping connections (either flanged or Victaulic or approved equal) with the piping system provided. 9. Starter a. Chiller shall have a single point power connection. Unit manufacturer shall furnish unit mounted compressor motor starter with primary circuit breaker of high interrupting capacity, Wye Delta, non reversing, closed transition type, for each unit suitable for use on project utility service. Equipment shall start without causing excessive voltage drop. Equipment shall not be damaged during fault and/or overload interruption. b. Starters shall be designed for use with compressor motor. Starters shall employ symmetrical magnetic air break line contactors. c. Interlocks shall be provided to prevent: (1) inadvertent operation of isolating mechanism under load; (2) opening of line voltage compartment door without isolating starter; and (3) closing of line contactor with door open. Provide solid state overload protection, for all three phases. Set in accordance with compressor motor requirements specified above. d. Starters shall be reduced inrush, wye delta type including the following installed items: 1) Ground fault protection. 2) 3 phase ammeter. 3) 3 phase voltmeter. 4) 95% power factor correction capacitors. 5) Power transformer for 120 V chiller control circuits. 6) Phase failure/reversal protection. 7) Under voltage protection. e. Starters shall have ASA 61 enamel over rust resistant phosphate undercoat finish. f. If chiller manufacturer provides a free standing rather than a unit mounted starter, then the Mechanical Division Contractor shall be responsible for starter installation including all control and power wiring between starter and chiller (including chiller auxiliary motors and controls), and including provision of 4" high housekeeping pad under starter. If chiller manufacturer does not furnish any starter component listed above, then that component shall be provided by the Mechanical Division Contractor, including all wiring. All wiring provided by the Mechanical Division Contractor, shall be performed by licensed electricians according to the requirements of the National Electrical Code. 10. Controls and Control Panel a. Controls shall be microprocessor based electronic and electric fully automatic and fail safe. Provide safety shutdown for low refrigerant temperature or pressure, bearing high temperature, high refrigerant pressure, motor temperature and motor overload. Controls shall have manual reset flags. Provide recycle shutdown for low oil pressure and low chilled water temperature, with automatic reset. Motor shall be protected against drawing more than rated full load amperes. Elapsed running time meter shall be factory installed on each machine. Electronic chilled water controller shall be in control panel, capable of throttling range setting of 0.5°F. b. Provide control panel wired to maximum extent possible, including:

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1) Gauges to indicate condenser, evaporator, oil and (if applicable) purge drum pressures. 2) Anti recycle timers to ensure 30 minute intervals (adjustable) between successive compressor motor starts. 3) Oil pump time delays to provide operation of oil pump during compressor coast down. 4) Time delay features to maintain capacity inlet guide vanes in closed position during compressor start up. 5) Low evaporator temperature, high condenser pressure, high motor temperature, motor overload , and differential oil pressure cutouts, factory wired to stop compressor motor independently. 6) Each shall have individual pilot light and manual reset. 7) Common wired auxiliary alarm contacts for remote alarm to DDC system. 8) Capacity control mechanisms to limit maximum amperage drawn by compressor motor by monitoring motor amperage and modulating inlet guide vanes. Limiter device shall permit manual control of power demand between 40 and 100% of full load power. 9) Operating hours run time meter. 10) Temperature sensors and wells. 11) Microprocessor control of leaving chilled water temperature. 12) Chiller hand off automatic switches. 13) Provisions for interlocking of compressors motor starters with differential pressure, switches, pumps and cooling tower fans. 14) Provide for interface to DDC system such that the DDC system can perform the following tasks remotely: a) start and stop the chiller b) reset the chilled water temperature c) reset the demand limiter between 40% and 100% of full load power. 15) Chiller controls shall automatically stage lead lag chillers depending on load. Designation of lead and lag chillers shall be manually selectable at the control panel. 16) The front of the chiller control panel shall be capable of displaying the following items, at a minimum: a) Entering and leaving evaporator and condenser water temperature b) Chilled water and electrical current limit setpoint. c) Diagnostic messages including which safeties have tripped out and which require manual reset before chiller can be restarted.

D. Startup and Service Contract

1. Prior to start up, factory service engineer shall check out field and factory installed wiring and piping connections and controls for conformance with Manufacturer's equipment requirements. After approval of these connections and controls, factory service engineer shall supervise starting and running of chiller through complete 24 hour cycle. Allow minimum of three days for this supervision. 2. Units shall be factory assembled with necessary piping and wiring. Provide services of factory trained service technician to field evacuate, charge and leak test machines, and to certify performance to specified conditions. Provide full charge of refrigerant and oil. Give DCAMM 10 days advance notice of performance testing. See Part 3 of these specifications for further requirements regarding chiller installation and refrigerant leak testing.

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3. Equipment shall have shop coat of non lead machinery paint. 4. Nameplates, catalog numbers and rating identification shall be securely attached to electrical and mechanical equipment with screws or rivets. a. During guarantee period, manufacturer shall furnish without cost to DCAMM, all required oil and refrigerant, and service machine fully as per manufacturer's standard operation and maintenance publications, using only manufacturer's service personnel. b. The chiller manufacturer shall furnish a one year Full Service Maintenance Labor and Parts Warrantee on the machine from the date the refrigeration machine started to operate. This shall, as a minimum, include a complete maintenance policy plus the spring start up fall and shut down of the machines, as well as monthly inspections which shall include the checking of the entire unit operation and adjustment of all operating and safety controls on the unit as per manufacturer's published literature. A written report of these inspections shall be made to the DCAMM Project Manager. Additionally an operating log shall be set up for the operating engineer and emergency service must be included and be available 24 hours a day locally.

E. Verification of Capacity and Efficiency

1. The proposed chiller shall be factory run tested under full load conditions to check performance (tons and KW). The manufacturer shall provide a certified test report to confirm that the centrifugal chiller performs as specified before final payment. Each proposal must include a factory sample test report to insure conformance with the latest edition of ARI Standard 550. 2. The performance test shall be run in accordance with the latest edition of ARI 550. The procedures and instrumentation must conform with ARI 550. 3. A certified test report of all data shall be forwarded to DCAMM’s Project Manger for approval prior to project acceptance. All calibration curves and information sheets for all of the above instrumentation shall be provided upon request. 4. If the equipment fails to perform within allowable tolerances, the manufacturer will be allowed to make necessary revisions to his equipment and retest as required. In the event that these revisions do not achieve submitted performance the following penalties will be imposed: 5. Capacity Test: For each ton below 95% of the design capacity, $500.00 per ton will be assessed to the manufacturer that supplied the centrifugal chiller or deducted from the contract price. 6. Power Consumption Test: The power consumption penalty shall be based on the tolerances set forth in ARI Standard 550. The power consumption penalty (P.C.P.) will be calculated based upon the following formula: a. P.C.P. = Measured KW (Measured Tons x Allowable KW/T* x $1,000/KW. 1) *Allowable KW/T = 1.05 x design KW/T. 7. Total Performance Penalty: The Total Performance Penalty will be the Capacity Penalty (see paragraph labeled Capacity Test above) plus the Power Consumption Penalty (see paragraph labeled Power Consumption Test above).

2.74 RECIPROCATING WATER CHILLER

A. Provide reciprocating water chiller of capacity and in location shown on Drawings.

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B. Compressor shall be reciprocating, serviceable hermetic, and shall have automatically reversible oil pump and operating oil charge. Compressor shall be equipped with suction and discharge shutoff valves, and shall be mounted on spring vibration isolators. Compressor motor shall be cooled by suction gas passing around motor windings and shall be thermally protected. Compressors shall be equipped with insert type crankcase heaters to control oil during shutdown. Time delay shall prevent rapid compressor recycling.

C. Circuit breakers shall be factory installed for compressor. Breakers shall be calibrated manual reset and ambient insensitive and shall open all three phases should an overload occur on any phase.

D. Cooler shall be shell and tube, with removable heads, two independent direct expansion refrigerant circuits on multiple compressor units and one refrigerant circuit on single compressor units. Seamless copper tubes shall be rolled into tube sheets. Shell shall be covered with layer of closed cell foam plastic, vapor barrier insulation.

E. Each refrigerant circuit shall include: hot gas muffler, combination moisture indicator and sight glass, refrigerant filter drier, liquid line solenoid valve, maximum operating pressure thermal expansion valve and charging valve. Suction lines shall be insulated with close fitting cellular insulation. Condenser less unit shall have discharge line check valves furnished for installation using remote condensers.

F. Water cooled condensers shall be mechanically cleanable shell and tube type with integral finned copper tubes, and shall have removable heads. Construction shall comply with applicable ASME code. Condensers shall provide positive subcooling of liquid refrigerant. Provide pressure relief valves, purge cocks and liquid shutoff valve on condensers.

G. Provide single point power connection for each chiller. Provide control box that contains: high and low pressure cutout switches for refrigerant circuit, manual reset low water temperature cutout switch and multiple stop chilled water temperature controller to ensure staggered starting of compressors and to provide three steps of capacity control. Indicator lights, start stop button, power fuse or circuit breaker and oil pressure safety switch shall be mounted on control panel in compressor. Chiller shall be by Carrier, Trane, McQuay or York.

2.75 AIR COOLED CONDENSER

A. Provide air cooled condenser of size and capacity shown on Drawing schedule, by Carrier, Trane, McQuay, or York.

B. Units shall consist of coils, with integral subcooling, and casing with stand. Coil shall be aluminum plate fins on mechanically expanded copper tubes. Coils shall be cleaned, dehydrated, sealed, leak tested at l50 psig, and pressure tested at 420 psig.

C. Fans shall be direct drive, propeller, protected with guards. Condensers shall have two 3 phase motors and one permanent split capacitor motor for use with accessory speed control suitable for reduced voltage starting. Motors shall be prelubricated, with built in overload protection.

D. Fan shaft shall be corrosion protected. Fan blades shall have irradiate or aluminum finish. Magnetic contactor shall be field supplied. Provide magnetic contactors in accessory fan cycling control package to cycle fans in response to outdoor ambient temperature.

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E. Casing shall have baked enamel finish. Access panels shall be provided for electrical connections.

F. Head pressure control shall be accomplished by fan cycling.

2.76 SPLIT SYSTEM DIRECT EXPANSION AIR CONDITIONING

A. Provide complete DX system for central station air conditioning units of types, sizes and capacities shown on schedules. System shall consist of matching air cooled condensing units, compressors, piping, controls, wiring and other accessories and appurtenances necessary to provide fully automatically functioning system.

B. Condenser coil shall be aluminum plate fins, mechanically bonded to seamless copper tubes, circuited for subcooling. Provide propeller fans arranged for vertical discharge. Condenser fan motors shall have inherent protection and shall be permanently lubricated and resiliently mounted. Fans shall have safety guards. Provide controls for cycling fans.

C. Compressors shall be serviceable hermetic with external spring isolators and automatically reversible oil pump.

1. Compressor shall unload in response to suction pressure in steps for partial load operation. Compressor shall be separated from condenser fans and coil. 2. Multiple compressor units shall have stop start fans and coils. Compressor motors shall have part winding start.

D. Provide factory wired controls in separate enclosure. Safety devices shall consist of high and low pressure switching and compressor overload devices. Wiring shall incorporate positive acting timer to prevent short cycling of compressor if power is interrupted. Time shall prevent compressor from restarting for approximately 5 minutes after shutoff. Units shall have transformer control circuit.

E. Casing shall be galvanized steel finished with baked enamel. Provide service access panel.

F. Provide openings for power and refrigerant connections.

G. DX air conditioning system be capable of starting and operating down to 0°F ambient. Low ambient operation shall be accomplished by varying the speed of condenser fan based on sensing of head pressure in refrigerant liquid line, by modulating damper in condenser fan discharge based on refrigerant head pressure sensing, or by flooding the condenser coil with liquid refrigerant to maintain the desired condenser pressure. Low ambient systems which cycle fans or modulate dampers based on ambient temperature exclusively, are unacceptable. Provide time delay relay for timed bypass of the low pressure switch or other means to start condensing unit at 0 F without nuisance safety trip units. Any field installation and control wiring of low ambient operation components shall be performed under the work of the mechanical section according to equipment manufacturers instructions. If condensing unit does not come with hot gas bypass prepiped, provide under the work of the mechanical section all components necessary for hot gas bypass operation. Hot gas system shall be piped in strict accordance with recommendations of condensing unit manufacturer. Submit with shop drawings showing refrigerant piping, hot gas piping layout including bypass pipe sizes and connection locations, hot gas bypass valve and solenoid valves manufacturers and model numbers, sensing capillary

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bulb locations, control wiring of solenoid and details of any other components. Adjust hot gas bypass in field, as required, to maintain proper system operation.

H. Provide refrigerant piping between air cooled condensing unit and AC unit. Provide necessary auxiliaries and appurtenances, such as strainer, sight glass, oil trap, scale trap, and other devices, to make system complete and operable under fully automatic control. Refrigeration piping shall be ACR copper tubing made up with wrought copper fittings using silver solder, installed with nitrogen charge while soldering; of sizes as recommended by manufacturer of air conditioning unit and matching air cooled unit. Piping shall meet requirements of Piping and Valves Paragraphs of this Section.

I. Provide back seating globe stop valve, winged and sealed. Cap valves 1" and under shall be diaphragm packing.

J. Test as specified in Part 3.

K. Provide supports, hangers and other appliances necessary to support refrigeration system and air cooled units.

2.77 COMPUTER ROOM AIR CONDITIONING UNIT, CHILLED WATER

A. General

1. Provide where shown on drawings, of capacities as shown on schedules, chilled water computer room air conditioning units. Acceptable manufacturers shall be: 1) Airflow 2) Hiross 3) Liebert b. Provided they meet the performance requirements shown on the schedules, and the requirements of this specification. All units shall be pre piped, prewired and ready for final electrical, piping, control and alarm connections. Discharge and return air flow patterns of individual units (upflow, downflow), shall be as shown on drawings.

B. Cabinet

1. Cabinet frame shall be constructed of welded tubular or angle steel. Exterior cabinet panels shall be insulated with minimum of 1", 1 1/2 lb. density, fiberglass or mineral wool insulation, protectively faced on the side facing the airstream to prevent abrasion. 2. Exterior panels shall be easily removable to allow servicing of all interior components. Coordinate with detail of computer room unit, to ensure proper access to allow servicing of components in space provided for computer room installation. 3. Cabinet surfaces shall be cleaned and otherwise properly prepared at the factory, so that finish paint may be applied with proper adhesion. Cabinet frame shall be factory painted manufacturers standard color, while panels shall be factory painted, as directed by the Designer, to match the computer room decor.

C. Fans, Motors, and Drives

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1. Fans shall be statically and dynamically balanced forward curved centrifugal blowers. Speed of fans shall be adjustable by a variable pitch motor pulley. Provide separate drive for each fan. Drives shall be sized for 200% of the blower horsepower rating. Blower bearings be self aligning and shall have minimum L10 life of 100,000 hours. Fan housing shall be painted, galvanized or otherwise protected against corrosion. 2. Motors shall be mounted on an adjustable base and shall have a service factor of 1.15. All motors shall be high efficiency type.

D. Coils

1. Chilled water coil shall have aluminum fins bonded into copper tubes and shall be configured as an A frame. Coil shall be pressure tested to 350 psig. Provide modulating control valve, factory wired to microprocessor control system. Pressure rating of valve shall be as required under the "Valves" paragraph of these specifications. 2. Provide stainless steel drain pan under the cooling coil. 3. Provide electric reheat coil of capacities and number of stages listed on schedules. Coils shall be low watt density and electrically and thermally protected in accordance with UL requirements and the National Electrical Code.

E. Humidifier

1. Provide electrode boiler type self contained electronic humidifier, to discharge pure clean dry steam into the bypass air stream. Steam cylinder shall be disposable and replaceable. Provide clear audio and visual alarm to alert personnel when cylinder becomes full of minerals and needs replacing. Humidifier controls shall be solid state and shall provide for modulating humidifier output and automatic drain and fill cycles controlled by water level and solids buildup in cylinder. 2. For ducted units, provide contact to shut off humidifier, if set point of duct mounted high limit humidistat is reached. The mechanical contractor shall be responsible for the provision of the high limit humidistat and for all associated control wiring. 3. Quartz lamp type humidifiers shall be unacceptable.

F. Filters

1. Provide disposable, easily accessible filters (ladders will not be required for access to filters; access shall be from either side or from front of unit). Filters shall be 40% efficient according to the latest edition of ASHRAE Standard 52.

G. Electrical Panel and Components

1. All electrical components shall be prewired in accordance with the National Electrical Code. Provide for 24 volt control circuit wired and wired and routed in separate bundle from line voltage wiring. Provide prewired contactors for fans and electric heating coils. All line voltage three phase circuits shall be branch fused on all three phases. Provide all terminal boards, contracts, transformers, wiring and other required components for operation of computer room unit. Provide a complete wiring and schematic diagram on inside of control panel. 2. Provide non locking disconnect, accessible from front of unit, to interrupt power to the computer room unit.

H. Microprocessor Based Temperature Controls and Alarms

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1. Provide microprocessor based temperature control system including self diagnostic tests to report trouble conditions to operator and alarms listed below. System shall maintain setpoint +2°and room humidity setpoint +5%. Microprocessor controls shall maintain environmental conditions within the above ranges, regardless of how fast temperature and humidity conditions within the space change. All setpoints including alarm setpoints shall be user programmable and adjustable at front panel keypad and LCD and LED display. Provide minimum of 3 levels of security access to controls so that unauthorized users may not adjust setpoints. 2. Provide self diagnostics at display panel to display status of all computer room components and check for proper functioning of all control circuit boards. 3. Microprocessor shall sequence start up of units after a power failure to minimize inrush current. Provide battery backup to retain all setpoints and other monitored data during a power failure. 4. Provide contact to shut down computer room unit on activation of smoke detector. 5. Provide remote monitoring and control system which shall have the capacity to monitor the operation of up to 24 computer room air conditioning units and/or power conditioning systems. The remote system shall be able to access, monitor and change the setpoints of any computer room unit connected to it. The system shall be equipped with a CRT and line printer and shall be able to print out and display chronological alarm information as well as environmental conditions and operating modes at each system. The system shall also be able to print out summaries of environmental conditions at each computer room unit including: present temperature and humidity, daily high and low temperatures and , and average temperatures and humidities and temperatures for multi unit installations located in one space. Provide control wiring between remote system and each computer room unit and power conditioning unit attached to it. Provide two service terminals to monitor, program and troubleshoot the system.

I. Miscellaneous

1. Provide condensate pumps for units which require them as shown on the drawings or listed in the schedules. 2. Provide welded steel floor stands of heights shown on schedules. Stands shall include vibration pads. 3. Provide a 7 day/24 hour, two pen, temperature and humidity recorder with 250 charts, two bottles of red and two bottles of blue recording ink. Coordinate location of recorder with Designer. Mechanical contractor shall calibrate recorder against an electronic thermometer accurate to 1°F and a weather bureau quality sling psychrometer. Recorder shall be complete with 110 volt power supply, and shall be wired under the work of the mechanical contract (if power wiring is not explicitly called for in electrical contract documents).

2.78 COMPUTER ROOM AIR CONDITIONING UNIT (DX)

A. Provide complete computer room air conditioning system. System shall consist of central station air conditioning unit and matching air cooled condensing unit, including temperature controls, filters, humidifiers, and other system components as specified below, assembled and tested at factory prior to shipment. System shall include automatic temperature control panel and electric panel with main disconnect. System shall be of capacity indicated on Schedule. Rotating parts shall be provided with vibration isolators.

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B. Unit shall be (up flow) (down flow) and shall be arranged for free air return to filters by Liebert, Hiross or Airflow.

C. Control system shall be solid state plug in humidity and dry bulb step controller and sensing elements. Control system shall be 24 V. Humidity and dry bulb controls shall have indicator lights with push button test system.

D. Electrical control components, starters, transformers and contactors shall be enclosed within unit and installed so that unit can be serviced without shutting down system. Panel shall be wired in accordance with UL and CSA Standards with each circuit properly fused.

E. Refrigeration piping shall be type ACR copper with expansion valve, solenoid valve, dehydrators, high low safety control and suction accumulators. Hermetic compressor shall be provided with vibration mounting springs, built in safety protection and service valves.

F. Reheats shall be electric, slide in type, constructed in UL and CSA recommended enclosures. Elements shall be high grade durable nickel chromium alloy wire, with built in safety cutouts.

G. Humidifier shall be constructed of stainless steel, complete with easily removable inspection cover, float assembly, overflow. Heating element shall be self cleaning and constructed of stainless steel.

H. Cooling coil shall be direct expansion A frame with distribution header aluminum fins, copper tubes and heavy duty drain pan.

I. Fans shall be squirrel cage, double inlet, dynamically balanced with long life self lubricated bearings.

J. Cabinet shall be welded tubular steel with quick release sound insulated panels, aluminum double deflection grills, decorative accent panel and paint to match computer colors.

K. Filters shall be disposable 25% NBS Atmospheric Dust Spot rating arranged for change without shutdown or panel removal.

L. Provide air cooled condensing unit and receiver for outdoor installation with low ambient control to provide start up and operation to ambient temperatures to 0°F.

M. Unit shall be provided with integral condensate unit consisting of receiver, pump, flush control and accessories.

N. Provide system of refrigerant piping between air cooled condensing unit and AC unit. Furnish supports, hangers, strainers, sight glass, oil trap, scale trap and other devices as necessary. Refrigeration piping shall be ACR copper tubing with wrought copper fittings; using silver solder, installed with nitrogen charge while soldering; of sizes as recommended by manufacturer of air conditioning unit and matching air cooled unit. Piping system shall meet requirements of Piping and Valves Paragraphs of this Section.

O. Stop valves shall be back seating globe, winged and type sealed. Cap valves 1" and under shall be of diaphragm packing.

P. Test system as specified in Part 3.

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Q. Charge system with refrigerant and lubricating oil.

2.79 COMPUTER AIR CONDITIONING UNIT (GLYCOL)

A. Provide glycol cooled process cooling system with temperature controls, filters, humidifiers, remote closed circuit dry cooler reheat system and other components, by AC Manufacturing Company (Edpac) or approved equal.

B. Cabinet shall be rigid 1 1/2" minimum, structural angle frame, jig positioned and welded at junctions. Interior shall be insulated with 1" x 1 1/2 lb. density fiberglass with neoprene coating. Interior baffles, control cabinet and other sheet metal parts shall be galvanized steel. Provide hinged access panels, removable without tools.

C. Arrange equipment for free air return to front filters, at least 24" above floor with (top) (bottom) vertical air discharge. Piping and wiring connections shall be through bottom and back of equipment.

D. Air bypass shall be built into cabinet; relative humidity of discharge air shall not exceed 80%.

E. Panels shall be 18 gauge steel welded into rigid reinforced structure, with removable doors with concealed hinges. Fasteners shall not be visible. Equipment shall be serviceable from front. Panels shall be formed into 1 1/8" deep channel around perimeter with heliarc welded corners ground into smooth finish.

F. Cabinet doors and trim finish shall be color selected by Designer. Apply paint by phosphate and chrome process to meet Federal Specification TT C 490 for pretreatment of ferrous surfaces. Paint shall be baked on at minimum 350°F.

G. Provide DWDI forward curved centrifugal fans of heavy gauge steel. Wheels shall be statically and dynamically balanced and arranged on common cold rolled steel 1" shaft, turned ground polished with anti rust compound.

H. Provide self aligning ball bearings with permanently lubricated rubber interliner.

I. Drives shall be V belt sized for 200% of motor nameplate horsepower. Fan speed shall be adjustable with cast iron pulleys.

J. Provide heavy duty drip proof motor in NEMA rated frames with overload protection. Motor base shall be adjustable for belt tensioning.

K. Provide hermetically sealed compressors with resilient suspension system, oil strainer and inherent motor and anti slug protection. Provide service shut off valves on suction and discharge lines with gauge and control connection ports.

L. Provide direct expansion evaporator coils with independent circuits for each compressor. Prime surface shall be seamless copper tubes with aluminum plate fins. Return bends shall be heavy wall seamless copper tube. Test coils at 320 psig. Provide stainless steel coil support and condensate drain.

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M. Refrigerant circuit shall be refrigeration grade, seamless, type L copper tubing. Provide combination refrigerant filter dryer, sight glass and moisture indicator and thermal expansion valve with external equalizer. Provide low and high pressure cut outs without capillary tubing. Provide electric manual reset on high pressure cut out.

N. Provide accumulators sized for liquid seal under light load conditions, with valve, charging port and fusible plug with flare connection to relieve at 168°F.

O. Provide coaxial tube in tube copper waterpath condensers capable of withstanding bursting pressure of 2200 lbs., with water regulating valves.

P. Provide standard plate fin, hot gas reheater for dehumidification control to use waste heat from first stage compressor. Provide forced air duct, electric, open wire, Nichrome heaters.

Q. Provide evaporative, self flushing humidifier with disposable evaporation medium, controlled by solenoid valve without float valves, internal heaters or lamps subject to burn out. Supply water for heaters shall be heated to 140°F by refrigerant hot gas heat exchanger. Humidification shall take place in bypass air.

R. Provide replaceable 2" deep filters fitted on gasketed tracks and removable from top of equipment, rated no less than 89% NBS.

S. Dry Cooler

1. Remote dry cooler shall consist of casing, coil, propeller fan direct driven by separate fan motor, fan guards and mounting stand. 2. Provide coil with aluminum plate fins bonded mechanically to copper tubes. 3. Casing shall be 18 gauge bright aluminum sheet. Structural support members, including coil support frame, motor and drive support and legs shall be 18 gauge galvanized steel. 4. Fan shall have aluminum blades with steel hubs and shall be factory balanced before shipment. 5. Fan motors shall be drip proof, enclosed in unit casing. Motors shall have pre lubricated, sealed ball bearings with shaft mounted slingers. 6. Provide intake and exhaust ductwork as shown on Drawings.

T. Provide UL listed electrical panel with high interrupting capacity fuses; contactors with three overload protectors (one per phase) on compressor and fan motors; and, devices for automatic operation of air conditioning system. Mount complete wiring and schematic diagrams on dead front panel covering electrical box. Provide load break switch accessible from front of cabinet.

U. Provide integral automatic temperature and humidity control system. Panel shall contain sail switch, adjustable high return air thermostat, audible alarm, filter indicating flag, humidistat for humidification and dehumidification and thermostat for cooling and reheat control, prewired and factory tested. Alarm circuit shall indicate system failure by audible alarm and pilot light for following reasons:

1. power restoration after power loss 2. dirty filters 3. excessive room temp over 80°F (adj.) 4. compressor overload 5. high head pressure

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6. low head pressure 7. supply fan overload 8. loss of air flow

V. Excessive voltage drop shall disconnect system with automatic restart. Alarm shall sound if power is restored after interruption. Humidity and temperature controller shall sense return air stream of equipment. Provide momentary start stop pushbutton on cabinet to start and stop system manually.

W. Provide circulating pump with motor and starter suitable for glycol solution with dry cooler. Motors shall be factory wired to disconnect switch and protected by fuses. Provide expansion tank. Mount pump and control assembly in weatherproof enclosure with external disconnect. Low ambient control shall be designed for glycol solution suitable for 20°F ambient. Provide aquastat to turn off fan when leaving glycol solution drops below preset temperature.

2.80 SELF CONTAINED AIR CONDITIONING UNITS

A. Provide self contained air conditioning units of size and capacity as shown on Drawing schedules. Units shall be by Carrier, Trane, McQuay, York or approved equal. Units shall be of one piece packaged construction, completely assembled, wired, factory tested. Provide operating charge of refrigerant.

B. Provide hermetic compressor suction gas cooled with forced feed lubrication and internal motor winding protection.

C. Color code wires not visible in basic control panel except those connected directly to three phase motors.

D. Evaporator coil shall be embossed aluminum fins mechanically bonded to seamless prime surface copper tubing. Minimum rows shall be four.

E. Condenser shall be air cooled with aluminum plate fins mechanically bonded to seamless ACR copper tubing. Condenser air shall be drawn through and discharged from rear face of unit. Blowers shall be of double inlet centrifugal type capable of discharging through ducting without sacrificing capacity.

F. Provide forward curved centrifugal fans. Blowers shall run on permanently lubricated bearings with Fibrex V belt drive and variable pitch fan motor pulleys.

G. Provide low voltage controls, branch circuit fuse protection, compressor motor protection and high low pressure switch(es). Single overload protection or fusing of more than one motor will not be acceptable; each motor shall be supplied with individual overload protection.

H. Cabinet shall be 14 gauge cold rolled steel, thermally and acoustically insulated and finished with two coats of smooth baked enamel. Provide access panels for serviceable components.

I. Arrange electrical control and compressor sections so that electrical and refrigeration analysis can be accomplished without disturbing normal airflow over heat transfer surfaces. Provide fittings to attach gauges to read suction and discharge pressures without loss of refrigerant.

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2.81 PACKAGED TERMINAL AIR CONDITIONING UNITS

A. Provide air cooled air conditioning package of size, type, and capacity shown and scheduled on Drawings, by Carrier, Trane, McQuay.

B. Wall cabinet shall be heavy gauge galvanized steel with baked enamel finish over prime coat. Provide extruded aluminum alloy horizontal line grill with anodized finish. Provide extruded aluminum evaporator air discharge louver by unit manufacturer with integral console control cover. Cabinet front finish shall be as selected by Designer.

C. Chassis shall contain condensing coil, hermetic compressor, evaporator coil, condenser fan, two heavy duty motors, heater element, double inlet centrifugal blowers, and controls, factory assembled, wired and tested. Unit shall meet NEC Standards and shall be UL listed.

D. Provide adjustable outdoor air control to admit make up fresh air to 20% of air delivered to room. Unit shall permit cooling operation at outdoor temperature to 35°F.

2.82 INLINE CENTRIFUGAL EXHAUSTERS AND TRANSFER FANS

A. Provide belt driven inline centrifugal fans as shown on Drawings and on schedules. Fans shall be factory assembled for field installation. Fan assembly shall consist of following:

1. Non overloading backward inclined wheels statically and dynamically balanced, keyed and locked to drive shaft. 2. All aluminum construction. 3. Externally mounted NEMA design drip proof ball bearing motor. 4. Companion rings. 5. Belt guard. 6. Spring type vibration isolators. 7. Disconnect switch. 8. Die stamped and dynamically balanced steel fan blade with non over loading operating characteristic. 9. Drip proof motor mounted on slotted base for belt tensioning. 10. Prelubricated ball bearings. 11. All welded drawn steel frame. 12. Baked enamel finish over one coat of primer. 13. OSHA approved belt guard.

B. Fans shall be tested and performance rated in accordance with Air Moving and Conditioning Association Standards and shall bear AMCA certified rating seal.

C. Fans shall be either L.C. Cook, Jenn Air, Penn Ventilator, Greenheck, ILG or ACME.

2.83 EXHAUST FANS CONFERENCE ROOM TYPE

A. Provide direct drive centrifugal (ceiling) (wall) fans with forward curved blades as scheduled and shown on Drawings. Motor and fan shall be removable from housing. Fan shall have AMCA certified rating for air capacity and shall be UL listed. Motor shall have ball bearings.

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B. Housing shall be sheet steel with acoustical insulation. Inlet and discharge openings shall be flanged. Units shall have molded white ceiling grille with 85% free area.

C. Provide backdraft damper, terminal box with cord, plug, and receptacle in housing.

D. Provide solid state variable speed controller for each unit by fan manufacturer.

E. Fan shall be Penn, Greenheck, Jenn Air, Cook, ILG or ACME.

F. Provide self flashing spun aluminum (roof cap) (wall vent) with integral birdscreen.

2.84 BELTED VENT SET

A. Provide AMCA rated and sealed all steel belted vent sets in locations and of capacities shown on Drawings, by Greenheck, New York Blower, Twin Cities, Penn, Cook, Peerless, Barry, Buffalo, ILG, Bayley or ACME.

B. Provide venturi inlet cone, backward inclined wheel, adjustable pitch V belt drive rated for 165% of driven horsepower, open drip proof motor, adjustable sheaves and permanently lubricated ball bearings.

C. Provide phosphatized, enameled housings with inlet and outlet guards, bolted access door, drains, weather hoods, backdraft dampers and disconnect switches.

D. Motors shall be high or premium efficiency type. See "Motors and Starters" paragraph of this specification for required efficiencies and other requirements.

E. Provide anti corrosion coating.

F. Motor shall be explosion proof with non sparking wheel.

G. Provide rubber in shear vibration isolators.

H. Provide heat slinger.

2.85 DUCT (VANE) AXIAL FANS

A. Provide (direct drive) (and) (belt driven) duct (vane) axial fans of sizes and capacities and in locations shown on Drawings, by Hartzell, Aerovent, Bayley, Buffalo, Chicago, Joy, Flakt or Woods. Fans shall be tested and performance rated in accordance with applicable AMCA standards and shall bear AMCA certified rating seal.

B. Housings shall be aluminum or hot rolled steel with rolled steel flanges, continuously welded to drum.

C. Provide cast aluminum alloy airfoil propellers, individually ground with tapercock bushings.

D. Shafts shall be steel, ground, polished and sealed at both ends.

E. Provide welded steel motor base plate.

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F. Bearings shall be deep row radial ball, self aligning, shielded and mechanically sealed in cast iron or malleable iron housings.

1. Bearings on belt drive fans shall be relubricable without interrupting service. 2. On direct drive fans provide lubrication tubes extending from motor to exterior of fan housing.

G. Motors and Drives

1. Provide variable speed totally enclosed motors for direct drive fans. 2. Motors on belt drive fans shall be externally mounted, open end, drip proof. Belts shall be oil , heat and static resistant. Belts shall be oversized for continuous duty. 3. Motors shall be high or premium efficiency type. See "Motors and Starters" paragraph of this specification for required efficiencies and other requirements.

H. Fans shall be suitable for installation in any position from vertical to horizontal.

2.86 PROPELLER FANS

A. Provide where shown on Drawings propeller fans of sizes and capacities listed in Schedule.

B. Fans shall be tested and performance rated as required by AMCA and shall bear AMCA seal.

C. Propellers shall be statically and dynamically balanced and set in deep spun venturi orifice.

D. Fans shall be provided with following:

1. Cast aluminum blades, designed for intended duty and factory adjusted for pitch, non overloading. 2. Phosphatized panels with high gloss enamel coating. 3. Matching self acting backdraft damper, unless otherwise shown on Drawings. 4. Expanded metal OSHA fan guard.

E. Provide prelubricated, self aligning pillow block ball bearings and belt tensioning variable pitch pulleys for belt driven fans.

F. Fans shall be by Penn, New York Blower, Peerless, Jenn Air, Greenheck, ILG, Cook, ACME, Hartzell or Aerovent.

2.87 CENTRIFUGAL FANS

A. Provide centrifugal fans by Chicago, Cook, Trane, ILG, Barry, Greenheck, New York Blower with welded steel housing and wheel, balanced dynamically and statically. Fans shall be AMCA certified and sealed.

B. Backdraft dampers shall not be provided when fans are specified or scheduled to be equipped with automatic control dampers in or immediately below curb.

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C. Provide V belt, variable pitch drives for +10% speed variation and with spring loaded belt tensioner.

D. Fans shall have centrifugal with backward curved blades fan connected to electric motor so selected that in no instance can fan motor be overloaded at capacities shown on schedule on Drawings. Provide open drip proof motor on adjustable base. Motors shall be high or premium efficiency type. See "Motors and Starters" paragraph of this specification for required efficiencies and other requirements.

E. Provide V belt (direct) drives sized as recommended by manufacturer. Belt construction shall be rubber and cord. Belt sets shall be matched for length. Belt capacity shall be 150% of motor horsepower rating. Sheaves shall be cast and machined iron or steel larger than minimum diameters recommended for particular belt. Sheaves shall be balanced dynamically and statically.

F. Provide belt guards of 18 gauge steel mesh or perforated or expanded steel sheets with angle frames and galvanized steel or iron trim, rigidly braced. Provide ports for tachometer speed measurements at fan shafts.

G. Provide spring vibration isolation bases as shown on Drawings and as specified in Vibration Isolation Paragraph.

H. Provide variable inlet vanes.

I. Provide weather hoods as necessary. 1. Inlet screen. 2. Bolted access door. 3. 200,000 hr. L 10 life bearings. 4. Anti corrosion coatings.

2.88 CENTRIFUGAL FANS FOR ROOF EXHAUST

A. Provide (dome) (low silhouette) (penthouse) V belt (variable pitch belt drive) (direct drive) fans that are certified to bear the AMCA seal, with:

1. 12" high aluminum prefabricated roof curb with (thermal/ acoustical lining with 10% sound reduction) (lining with at least 30% sound reduction). 2. Gravity backdraft dampers. 3. Bird screen. 4. Spun aluminum housing. 5. Disconnect switch. 6. Inlet venturi orifice. 7. Vibration isolation. 8. Permanently lubricated ball bearings. 9. Enclosed, fan cooled motor. 10. 1Junction box.

B. Belt drives shall have +5% speed variation and spring loaded belt tensioner. Direct drives shall have speed controller in junction boxes.

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C. Fans shall be by Penn, Greenheck, Cook, ACME, ILG.

2.89 INLINE CENTRIFUGAL FANS

A. Provide where shown on drawings, of capacities as shown on schedules, inline centrifugal fan(s). All fans shall have their air performance rated by AMCA and shall bear the AMCA seal. Acceptable manufacturers, provided they meet the requirements of this specification and the performance and pressure class requirements shown on the schedules, shall be: Barry, Cook, Penn, Greenheck, Acme.

B. Tubular housing shall be heavy gauge steel, all welded construction. Provide bolted and gasketed access door to permit inspection of fan impeller.

C. Fan wheel and drive assembly shall be statically and dynamically balanced at the factory. V belt capacity shall be 150% of motor horsepower rating. Fan motor pulley shall be adjustable pitch type. Provide an adjustable motor base. Provide OSHA approved belt guard for drive components which are located outside of fan housing. Provide ports for tachometer speed measurements at motor shaft. Motors shall be high or premium efficiency type. See "Motors and Starters" paragraph of this specification for required efficiencies and other requirements.

D. Provide self aligning bearings with minimum L 10 life of 200,000 hours. Provide extended lubrication lines.

2.90 RECIRCULATING ROOF VENTILATOR

A. Provide direct drive axial type recirculating roof ventilators as shown on the drawings. Ventilators shall provide four modes of operation: exhaust, supply, recirculation and mixing mode.

B. Propeller construction shall be cast aluminum, airfoil, reversible design. Propeller shall be statically and dynamically balanced.

C. Fan hood and base construction shall be galvanized steel. Bases shall be 12" high. Hood panels shall be arched with interlocking seams for weather protection. Provide ½" galvanized steel mesh birdscreens mounted horizontally across the discharge /intake area of the hood. Hood support members shall be heavy gauge galvanized steel angles.

D. Plenums shall be constructed of galvanized steel. Plenum mounting channels shall be heavy gauge galvanized steel. Access panels shall be provided in each of two opposing sides of plenum.

E. Dampers shall be constructed with galvanized steel frames and blades. Exhaust/supply dampers shall be Greenheck model VCD 2120 low leakage type control dampers or equal. Recirculation dampers shall be Greenheck model VCD 1020 control dampers or equal. Damper actuators for exhaust, supply and recirculation fans shall be modulating type with spring returns.

F. Motors shall be heavy duty ball bearing type matched to the fan load at the specified voltage, phase and enclosure. A standard square key and set screws or tapered lock bushing shall attach the propeller securely to the motor shaft. Motors shall be provided at 1160 rpm maximum.

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G. Motor support frame assemblies shall be constructed of heavy gauge steel angles. Fan panels shall be heavy gauge steel with formed flanges and a double venturi.

H. Performance shall be equal for exhaust, supply and recirculate modes.

I. Each unit shall bear a permanently affixed name tag with the fan manufacturer, model number, serial number and tag no. Control centers shall bear a name tag with identical information.

J. Provide one control panel for each ventilator in location as shown on the drawings unless otherwise directed by the engineer. Control panel shall be a Greenheck ESRM-CC with integral motor starter or equal and shall control four modes of operation: Exhaust, Supply, Recirculate and Mix modes. Controls shall include NEMA 1 control panel with panel mounted disconnect switch, indicator/fan status light and mode selector switch. Mix mode controls shall include a temperature controller which shall modulate the exhaust/supply and recirculation dampers as required to maintain the preset temperature as sensed by the field mounted temperature sensor located at the fan discharge.

K. Hooded axial roof ventilators shall be as manufactured by Greenheck, Aerovent or Hartzell.

2.91 ROOF MOUNTED FRESH AIR HOOD

A. Hood shall be low silhouette, mushroom style with all aluminum reinforced construction. Hood shall be lined on interior with 1", 3 lb. density fiberglass board for sound absorption. Insulation shall be held in place with full coverage of adhesive and welded stick on fasteners positioned minimum of one foot on center.

B. Provide bird screen and deflection baffles to keep out rain and snow.

C. Seams shall be welded and/or caulked for weather tightness.

D. Provide matching curb with integral fiberglass sound lining.

E. Unit shall be Penn, Cook, Greenheck or Jenn Air.

2.92 ROOF VENTS

A. Roof vents shall be low silhouette type with aluminum housing, of sizes indicated on Drawings. Hood seams shall be lock formed at ends and vertical seams shall be continuously welded. Roof vents shall be equipped with following: 1. Bird screen. 2. Aluminum hood with hinged cover.

B. Roof curbs shall be field fabricated.

C. Roof vents shall be of same manufacture as roof exhaust fans.

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2.93 COMBUSTIBLE GAS DETECTION AND ALARM SYSTEM

A. Provide detection and alarm system with meter, integrated circuits, switching voltage regulator and master printed circuit board to sense lower explosive level (LEL) of combustible gases at single detection point and produce aural and visual alarms at preset level, by measuring and amplifying electrical differences between catalytic filament and reference filament.

B. LEL circuit shall have two switching circuits. One shall activate red alarm light and pulsating buzzer at preset high level. Second shall actuate low level steady tone alarm and amber light for malfunction warning. Alarm levels shall be factory set and field adjustable.

C. Sensing filaments shall be housed in sintered stainless steel flame proof enclosure.

D. Meter shall be scaled 0 100% of LEL.

E. Power requirements shall be 115 V.

F. Unit shall be by MSA or equal.

2.94 CARBON MONOXIDE (CO) DETECTION AND CONTROL

A. Provide electronic CO detection and control equipment with integral gas electric transducer sensor and plug in, solid state electronic board, where shown on Drawings.

B. Electronic board shall be factory calibrated to operate at 50 ppm and 100 ppm CO. At 50 ppm, unit shall close two independent SPST contacts and light indicating LED. At 100 ppm, unit shall provide visual and audible alarm and close two independent SPST contacts. Provide 30 minute delay between detection of 100 ppm and corrective operation and alarm indications.

C. Electronic board shall incorporate indicating LEDs for CO levels and integral system test pushbuttons. Provide automatic decontamination of sensor after temporary shut downs.

D. Unit shall have gasketed, locked enclosure with no accessible knobs or buttons. Input and output terminals shall be in separate terminals section.

E. Provide services of manufacturer's technical service personnel to supervise installation and instruct User Agency’s personnel in operation, maintenance and field testing.

2.95 PACKAGED HEAT PUMP

A. Provide water to air packaged heat pump unit as shown on Drawings and as specified with total cooling and heating performance and capacity as shown on Schedules. Acceptable manufacturers shall be AAF, Climatemaster, Command-Aire, McQuay or Trane. Unit cabinet shall be 20 gauge galvanized steel, with prime coat and two part epoxy finish.

B. Ship factory assembled, precharged, pre tested, piped and wired internally.

C. Compressor shall be full hermetic or serviceable hermetic with internal motor protection. Condenser coil shall be coaxial with steel outer tube and copper inner tube. Evaporator coil

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shall have aluminum fins bonded mechanically to copper tubes, and shall be fed with thermostatic expansion valve. Provide high and low pressure safety controls that break control voltage to compressor contactor. Refrigerant flow shall be directed by four way .

D. Provide contactor, 24 V control transformer, blower relay, lockout relay and low voltage terminal board and remote mounted H C thermostat with sub base.

E. Provide circuit to lock compressor off when safety controls have been activated. Unit shall not be restartable until room thermostat has been turned off and on.

F. Provide factory mounted air filters.

G. Insulate evaporator and compressor compartment panels with 1 1/2 lb. fibrous glass insulation.

H. Provide belt driven evaporator blowers with common shaft and three sealed ball bearings.

I. Evaporator blower motor shall be 1750 rpm, three phase, with inherent overload protection or starter with quick trip heaters and sealed ball bearings.

J. Provide compressors with crankcase heater to prevent oil dilution on off cycle, and suction line thermostat to stop compressor when suction line temperature falls below setpoint.

2.96 CONSOLE HEAT PUMP

A. Provide water source heat pump conditioner where shown on Drawings with capacities and characteristics as listed in Schedule, arranged for 100% recirculated air. Acceptable manufacturers shall be AAF, Climatemaster, Command-Aire, McQuay or Trane.

B. Provide chassis for floor mounting, with integral control box mounted in chassis, and room cabinet (color as selected by Designer) with 4" high black toe step base.

C. Provide chassis suitable for fastening to wall at two points with removable fan deck with PSC motor, motor disconnect and refrigerant circuit and glass fiber filter mounted horizontally and removable without removal of room cabinet.

1. Supply and return connections shall be 5/8" O.D. copper tube. 2. Piping connections shall be right or left hand as shown on Drawings. 3. Provide 2 ft. by 4 ft. electric junction box for field power connections at same end as piping connections. Tape paper board cover over coil and drain pan assembly.

D. Provide sealed refrigerant circuit with hermetic motor compressor, air to refrigerant finned tube coil, capillary expansion tube, pilot operated refrigerant reversing valve, water to refrigerant coaxial tube exchanger and high pressure and low temperature safety cutouts.

E. Wire chassis through factory installed lock out relay to hold conditioner off until electrically reset at control or circuit breaker panel. Guarantee unit starting and operation at minimum ambient temperature of 40°F with specified water flow and 80°EWT.

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F. Provide control box at opposite end of unit from piping connection with automatic changeover control with five button Heat Off Cool High Low switch. Thermostat remote bulb shall have factory mounted and wired heat anticipator on heating cycle.

G. Cabinet shall have continuous extruded aluminum grille with fixed parallel blades to provide 15°air deflection from vertical. Cabinet shall be arranged for installation over chassis. Secure toe step to chassis flanges with two screws.

H. Conditioner shall be designed specifically for single voltage application; guarantee start and run operation at +10% of nameplate voltage in minimum 40°F ambient with 80°entering water temperature.

I. Provide spare chassis for each model installed.

2.97 CEILING MOUNTED HEAT PUMP

A. Provide ceiling mounted heat pumps with horizontal air inlet, and air discharge. Acceptable manufacturers shall be AAF, Climatemaster, Command-Aire, McQuay, or Trane. Casing shall have corner and panel construction with 14 gauge galvanized steel base pan. Provide access panels lined internally with acoustic fibrous glass for electrical access on one side and blower and motor access on opposite side. Coat internal parts subject to water exposure with baked on thermo setting plastic.

B. Service panels on the bottom of ceiling mounted equipment shall be hinged or provided with safety chains to prevent them from falling when opened.

C. Corners shall have threaded nut and pin locator hole for hanger bracket assembly. Provide hanger bracket assemblies, with heavy steel hanger bracket, integral vibration isolator, cap screw and plated isolator washer. Hanger bracket assemblies shall accommodate 3/8" diameter hanger rod.

D. Provide sealed refrigerant circuit with hermetic motor compressor with internally fused capacitor (none on three phase), air to refrigerant finned tube coil, capillary expansion tube, pilot operated refrigerant reversing valve, water to refrigerant coaxial tube exchanger and high pressure and low temperature safety cutouts on refrigerant circuit. Wire cutouts through factory installed lock out to relay to hold conditioner off regardless of wall thermostat position until reset electrically at circuit breaker panel.

E. Provide thermostat and wall mounted sub base.

F. Provide (direct drive) (belted drive) centrifugal blower. Motor speed shall not exceed 1200 rpm synchronous speed. Motor shall have two year lubrication capacity and shall be factory lubricated. Provide external access oiler tubes.

G. Conditioner shall have 1" thick fibrous glass air filter in four sided filter frame at air inlet with one side removed in field for filter access. Locate piping and electrical connections to eliminate interference with removal and replacement of filter.

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2.98 VIBRATION ISOLATION (NON-SEISMIC)

A. General

1. Manufacturer Responsibility a. Manufacturer of vibration equipment shall have the following responsibilities: 1) Guarantee specified isolation system deflections. 2) Provide installation instructions, drawings and field supervision to insure proper installation and performance of systems. 2. Quality Assurance a. All vibration isolators shall have calibration markings or some method to determine adjustment, the actual deflection under the imposed load after installation and adjustment. b. All isolators shall operate within the linear position of their load vs. deflection curves. Load vs. deflection curves shall be furnished by the manufacturer and must be linear over a deflection range of not less than 50% above the design deflection. c. The theoretical vertical natural frequency for each support point, based upon load per isolator and isolator stiffness, shall not differ from the design objectives for the equipment as a whole by more than +10%. d. Substitution of internally isolated equipment in lieu of the isolation specified in this section, is acceptable provided all conditions of this section are met. The equipment manufacturer shall provide a letter of guarantee stating that the specified noise and vibration levels will be obtained or the cost of converting to the specified external vibration isolation shall be born by the equipment manufacturer. e. The following specifications describe spring hangers with 30 degree misalignment feature. This requirement is mandatory. the Contractor shall replace any hangers without the 30 degree capability discovered on site at no additional cost to DCAMM.

B. Products 1. Description a. All vibration isolation devices shall be the product of a single manufacturer. Products of other manufacturers are acceptable provided their systems strictly comply with intent, structural design, performance, and deflections of the base manufacturer. b. Acceptable manufacturers of vibration isolation products shall be: Mason Industries, Amber Booth Company, Peabody Noise Control, Korfund Dynamics Corporation, Vibration Mountings and Equipment, Vibration Eliminator Co., provided they meet the requirements of this specification. Mason Industries model numbers have been used in this specification to establish quality of components, but are in no way to limit competitive bidding by other manufacturers. c. Refer to Table A at the end of this article for application of the various types listed to appropriate equipment and efficiency level. 2. Vibration Isolation Types a. Vibration Isolators 1) Type A: Spring Isolator a) Having a minimum OD to OH of 0.8:1. b) Corrosion resistance where exposed to corrosive environment with: 2) (Springs cadmium plated or electro-galvanized. 3) (Hardware cadmium plated.

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4) (All other metal parts hot-dip galvanized. a) Reserve deflection (from loaded to solid height) of 50% of rated deflection. b) Minimum ¼" thick neoprene acoustical base pad on underside. c) Designed and installed so that ends of springs remain parallel. d) Non-resonant with equipment forcing frequencies or support structure natural frequency. e) Mason Ind. Type SLF 5) Type B: Spring isolator shall be the same as Type A with the following additional features: a) Built-in vertical limit stops with minimum ¼" clearance under normal operation. b) Tapped holes in top plate for bolting to equipment. c) Capable of supporting equipment at fixed elevation during equipment installation. Installed and operating heights shall be identical. d) Adjustable and removable spring pack with separate neoprene isolation pad. 6) Mason Ind. Type SLR 7) Type C: Spring hanger rod isolator. a) Spring element seated on a steel washer within a neoprene cup incorporating a rod isolation bushing. b) Steel retainer box encasing the spring and neoprene cup. c) When used on ductwork, provide eyebolts for attachment to duct straps. d) Mason Ind. Type H5, WHS 8) Type D: Double deflection neoprene mountings. a) All metal surfaces shall be neoprene covered and have friction pads top and bottom. b) Be capable of .035" deflection at rated load. c) Steel rails shall be employed to compensate for overhang on units such as small vent sets, close coupled pumps, etc. d) Mason Ind. Type ND or Rails Type DNR. 9) Type E: Elastomer hanger rod isolator. a) Molded (min. 1-3/4" thick) neoprene element with projecting bushing lining the rod clearance hole. Static deflection at rated load shall be a minimum of 0.35". b) Steel retainer box encasing neoprene mounting capable of supporting equipment up to four times the rated capacity of the element. c) Mason Ind. Type HD 10) Type F: Combination spring/elastomer hanger rod isolator. a) Spring and neoprene elements in a steel retainer box with the features as described for Type A and E isolators. b) Mason Ind. Type DNHS 11) Type G: Pad type elastomer isolator. a) 0.75" minimum thickness, 50 psi maximum loading, ribbed or waffled design. b) Minimum 0.1" deflection. c) 1/16" galvanized steel plate between multiple pad layers. d) Load distribution plate where attachment to equipment bearing surface is less than 75% of the pad area (Type "GM"). e) Mason Ind. Type Super W pad.

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12) Type H: Pad type elastomer isolator. a) Laminated canvas duct and neoprene, maximum loading 1,000 psi, minimum ½" thick. b) Load distribution plate where attachment to equipment bearing surface is less than 75% of the pad area (Type HM). c) Mason Ind. Type HL Pad. d) NOTE: When bolting is required, neoprene and duck washers and bushings shall be provided to prevent short circuiting. 13) Type I: Thrust restraints. a) A spring element similar to Type A isolator shall be combined with steel angles, backup plates, threaded rod, washers and nuts to produce a pair of devices capable of limiting movement of air handling equipment to ¼". b) Restraint shall be easily converted in the field from a compression type to tension type. c) Unit shall be factory precompressed. d) Thrust restraints shall be installed on all cabinet fan heads, axial or centrifugal fans whose thrust exceeds 10% of unit weight. e) Mason Ind. Type WB 14) Type J: Steel Rails a) Steel members of sufficient strength to prevent equipment flexure during operation. b) Height saving brackets as required to reduce operating height and cradle the unit. c) Mason Ind. Type ICS 15) Type K: Pipe anchors a) All directional acoustical pipe anchor, consisting of a telescopic arrangement of two sizes of steel tubing separated by a minimum ½" thickness of Type H pad. b) Vertical restraints shall be provided by a similar material arranged to prevent vertical travel in either direction. c) Allowable loads on isolation materials shall not exceed 500 psi. And the design shall be balanced for equal resistance in any direction. d) Mason Ind. Type ADA 16) Type L: Isolated clevis hanger a) Combination clevis or rod roller hanger and a Type C, (LC), E (LE), or F (LF) isolation hanger. b) System shall be precompressed to allow for rod insertion and standard leveling. c) Mason Ind. Type CIH 17) Type M: Flashable restrained isolator a) Shall have all features of Type B isolator. b) Shall have waterproof spring covers for adjustment or removal of springs. c) Unit shall have a structural top plate for welding or bolting of supplementary support steel. d) Isolator shall accept 2" roofing insulation and be flashed directly into the waterproofing membrane. e) To be complete with wood nailer and flashing. f) Mason Ind. Type REVRS 3. Equipment Bases

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a. General 1) All curbs and roof rails are to be bolted or welded to the building steel or concrete deck to attain 110 mph wind resistance requirement. b. Type B-1: Integral Structural Steel Base 1) Reinforced as required to prevent base flexure at equipment startup and misalignment of driver and driven units. Centrifugal fan bases shall be complete with motor slide rails and drilled for driver and driven units. 2) Height saving brackets as required to reduce operating height. 3) Mason Ind. Type M or WF c. Type B-2: Concrete Inertia Base 1) Rectangular structural concrete forms for floating foundations. Base for split case pumps shall be large enough to support elbows. The base depth shall be a minimum of 1/10 the longest span, but not less than 6" or greater than 14". Forms shall include concrete reinforcement consisting of ½" bars or angles welded in place on 6" centers both ways. A layer 1½" above the bottom and an additional top layer of reinforcing for all bases exceeding 120" in one direction. Isolators shall be set into pocket housings which are an integral part of the base construction and set at the proper height to maintain 1" clearance below the base. Base shall be furnished with templates and anchor bolt sleeves. a) Mason Ind. Type K, BMK, or KIPWF d. Type B-4: Flashable Roof Rail System 1) Rooftop fans, condensing units, air handlers, etc., shall be mounted on continuous support piers that combines equipment support and isolation into one assembly. 2) Rails shall incorporate Type A isolators which are adjustable, removable and interchangeable after equipment has been installed. 3) The system shall maintain the same installed and operating height with or without the equipment load. 4) The system shall have full plywood nailers on all four sides, designed to accept membrane waterproofing and shall be dry galvanized or plastic coated. 5) Unit to be supplied with flashing. 6) Curbs shall be Mason Type R-7000 having a minimum 3" rated static deflection. e. Type B-5: Roof Rail Base 1) Rails shall be constructed from structural steel angles as required to prevent flexure and misalignment under load. 2) Each rail shall be the full length of the supported equipment and be welded to a series of Type B isolators. Bolt-on angle cross ties at the ends and center shall form one rigid platform.

C. Roof Rail Type TRSLR

1. Flexible Connectors a. All connectors shall be installed on the equipment side of shutoff valves, horizontal and parallel to shafts whenever possible. b. Type FC-1: Elastomer connector 1) Manufactured of nylon tire cord and EPDM, both molded and cured in hydraulic presses.

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2) Straight connectors to have two (2) spheres reinforced with a molded-in, external ductile iron ring between the spheres. 3) Rated at 250 psi/170°F, dropping in a straight line to 170 psi/250°F for sizes 1½" to 12". 4) Sizes 10" and 12" at 200 psi and greater operating pressure, to employ control cables with neoprene end fittings isolated from anchor plates by means of ½" bridge bearing neoprene bushings. 5) Connectors shall be pre-extended per manufacturer's recommendation to prevent elongation under pressure. 6) Minimum safety factor of 3.6:1 at maximum pressure ratings shall be certified by test reports. Submittals shall also include two test reports by independent consultants showing minimum reduction of 20 Db in vibration accelerations and 10 Db in sound pressure levels at typical blade passage frequencies. 7) Connectors bolted to victaulic or approved equal type couplings or gate, butterfly or check valves to have a minimum 5/8" flange spacer installed between the connector and the coupling flange. 8) Neoprene in lieu of EPDM is not acceptable. 9) Mason Ind. Super-Flex Types: MFTNC or NFTFU.

D. Execution

1. General a. Isolation systems must be installed in strict accordance with the manufacturer's written instructions. Vibration isolators shall not cause any change of position of equipment resulting in stress on equipment connections. 2. Equipment Installation a. Equipment shall be isolated as per Table A at the end of this section. b. Place floor mounted equipment on 4" high concrete housekeeping pads properly doweled or expansion shielded to the deck. Mount vibration isolators and/or bases on housekeeping pads. Concrete work specified in Section 033000 – CAST-IN- PLACE CONCRETE. c. Additional Requirements 1) The minimum operating clearance under inertia bases shall be 2". 2) The minimum operating clearance under other bases shall be 1". 3) All bases shall be placed in position and supported temporarily by blocks or shims, as appropriate, prior to the installation of the machine, isolators. 4) The isolators shall be installed without raising the equipment. 5) After the entire installation is complete, and under full operational load, the isolators shall be adjusted so that the load is transferred from the blocks to the isolators are properly adjusted, shall be barely free and shall be removed. Remove all debris from beneath the equipment and verify that there is no short circuits of the isolation. The equipment shall be free in all directions. 6) Install equipment with flexibility in wiring. 3. Piping and Ductwork Isolation a. All piping and ductwork is included in this section. b. Installation 1) Isolate piping and ductwork outside shafts as follows: a) All in mechanical rooms. b) All exposed on roof.

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c) All within 50 ft. or 100 pipe diameters (whichever is greater) from connected rotating or reciprocating equipment and pressure reducing stations. d) Control air piping, from compressor discharge to receiver. 2) The isolators shall be installed with the hanger box attached to, or hung as closely as possible to the structure. 3) The isolators shall be suspended from substantial structural members sized for 0.08" deflection at center of span, not from slab diaphragm, unless specifically permitted. 4) Hanger rods shall not short circuit the hanger box. 5) Horizontal suspended pipe 1¼" to 2" and all steam piping shall be suspended by Type E isolators with a minimum 3/8" deflection. Water pipe larger than 2" shall be supported by Type F isolators with a minimum 1" deflection or same deflection as equipment for the first 3 locations nearest equipment whichever is greater. a) Type L hangers may be substituted for the above. 6) Ductwork shall be supported by Type C (WHS) hangers. 7) Horizontal floor and roof supported pipe shall be the same as C.3.b.5 except use isolators Type D and Type A, respectively. 8) Vertical riser pipe supports under 2" diameter shall utilize Type H isolation. 9) Vertical riser guides, if required shall avoid direct contact of piping with the building. 10) Pipe anchors or guides where required, shall utilize Type K isolators. 11) Riser sway supports, where required, shall utilize two (2) neoprene elements (Type G or H) to accommodate tension and compression forces. 12) Pipe extension and alignment connectors: Provide Type FC-2 connectors at riser takeoffs, cooling and heating coils and elsewhere as required to accommodate thermal expansion and misalignment. 13) Install Type FC-1 flexible connectors at all connections of pipe to equipment such as pumps, chillers, cooling towers and as shown on the drawings. 14) Install FC-2 type connectors at all locations which exceed temperature limitations of FC-1. 15) For control air piping, provide two flexible connectors Type FC-2 90° to each other in the compressor discharge piping to the receiver. When the receiver is remote from the compressor, isolate the piping between the compressor and receiver with Type C isolators having 3/8" deflection. The receiver shall be isolated with Type D isolators having 3/8" deflection. 4. Inspection a. Upon completion of installation of all vibration isolation devices, the local representative shall inspect the complete project and certify in writing to the Contractor that all systems are installed properly, or require correction. The Contractor shall submit a report to DCAMM’s Project Manager, including the representative's report. Certifying correctness of the installation or detailing corrective work to be done.

TABLE A

NON-CRITICAL CRITICAL

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EQUIPMENT HP MTNG ISOL DEFL BASE ISOL DEFL BASE Absorption Mach. Flr GM .10 -- B .75 J* AC Units (Dx) Flr D .30 -- -- A .75 J* -- Clg - -- F .75 Air Compressors to 10 Flr D .30 -- A .75 -- Tank or Unitary > 10 Flr A .75 -- A 1.50 B-2

Air Cooled Cond. Fir - -- -- A 2.50 B-4 or Chillers Axial Fans Flr D .30 - -- A** See Guide -- -- Clg - - -- F Base Mounted Pumps to 15 Flr D .30 B-2 A .75 B-2 > 15 Flr D .30 B-2 A 1.50 B-2 Boilers Flr GM .10 -- B .75 -- Centrif. Chillers Flr D .30 J* B 1.50 J* Centrif. Fans Flr D .30 - B-1 A** See Guide B-1 Arr. 1 & 3 Clg - - -- F *** Arr. 9 & 10 Flr D .30 - J - A** See Guide J J Clg - - - F Computer Rm Units Flr D .30 - B-7 A .75 B-7 - Clg - - -- F .75 - Condensate Pumps Flr D .30 J D .30 J Cooling Towers Flr B .75 -- M 2.50 -- Fan Coil Units Flr D .30 - -- A .75 -- -- Clg - - -- C .75

Unit/Cab. Heaters Clg - -- -- E .30 --

*Used on vertically arranged units. Rails to be 1½ times the unit height. DEFL. GUIDE

** Substitute TYPE B isolator for roof installations. RPM DEFL ***Substitute TYPE B-2 base for Class 2 & 3 fans. < 400 3.5" < 600 2.5 > 600 1.5

5. Notes: a. "ISOL" and "BASE" column indicates letter type as appears in the specs. b. "MTNG" refers to method of support of equipment from the structure.

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c. "SEE GUIDE" indicates isolator deflection selection to be taken from RPM/DEFLECTION Guide at bottom of table.

2.99 VIBRATION ISOLATION (SEISMIC)

A. General

1. Description a. Provide the necessary vibration isolation materials to eliminate excessive noise and vibration from being transmitted from the equipment to the occupied areas of the structure and also serve as the basis for seismic restraint design for the entire mechanical system within the building (see definitions). Provide isolation materials and seismic restraints complete as shown and specified. b. The work in this section includes the following: 1) Vibration isolation elements for equipment. 2) Equipment isolation bases. 3) Piping flexible connectors. 4) Seismic restraints for isolated equipment. 5) Seismic restraints for non-isolated equipment. 6) Certification of seismic restraint designs, and installation supervision. 7) Certification of seismic attachment of housekeeping pads. c. Definitions: The term EQUIPMENT will be used throughout this specification and it includes all non-structural components within the facility and 5 feet outside the facility that is not buried underground including but not limited to: Air Distribution Condensers Piping

Air Handling Units Condensing Units Pumps (All types) Boilers Control Panels Tanks (All types) Cabinet Heaters Cooling Towers Var. Freq. Drives Chillers Ductwork Water Heaters Rooftop Units Mounted Coils Compressors Fans Furnaces

2. Certification and Analysis a. Seismic restraint calculations must be provided for all connections of equipment to the structure. b. Calculations to support seismic restraint designs stamped by a structural, civil engineer or professional mechanical engineer. c. A seismic design liability insurance certificate must accompany all submittals. 3. Code and Standards Requirements a. BOCA b. SMACNA Guidelines for seismic restraint of mechanical system c. NFPA - 13 and 14 d. All State and local codes. 4. Manufacturer Responsibility a. Manufacturer of vibration and seismic control equipment shall have the following responsibilities: 1) Determine vibration isolation and seismic restraint sizes and locations. 2) Provide equipment vibration isolation and seismic restraints as scheduled or specified.

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3) Guarantee specified isolation system deflections. 4) Provide installation instructions, drawings and field supervision to insure proper installation and performance of systems. b. Manufacturer's working in this section must provide a seismic design errors and omissions insurance certificate with their bid to certify their ability to provide engineering and design as required by this section. 5. Quality Assurance a. All vibration isolators shall have calibration markings or some method to determine the actual deflection under the imposed load after installation and adjustment. b. All isolators shall operate within the linear portion of their load vs. deflection curves. Load vs. deflection curves shall be furnished by the manufacturer and must be linear over a deflection range of not less than 50% above the design deflection. c. The theoretical vertical natural frequency for each support point, based upon load per isolator and isolator stiffness, shall not differ from the design objectives for the equipment as a whole by more than +10%. d. Substitution of internally isolated and restrained equipment in lieu of the isolation and restraints specified in this section is acceptable provided all conditions of this section are met. The equipment manufacturer shall provide a letter of guarantee stamped and certified per paragraph A.2 stating that the specified noise and vibration levels will be obtained and that the restraints are in compliance with these specifications or all costs of converting to the specified external vibration isolation and/or restraints shall be born by the equipment manufacturer. e. The following specifications describe spring hangers with 30 degree misalignment feature. This requirement is mandatory. The Contractor shall replace any hangers without the 30 degree capability discovered on site at no additional cost to DCAMM.

B. Products

1. Description a. All vibration isolation and seismic devices shall be the product of a single manufacturer. b. Acceptable manufacturers of vibration isolation products shall be: Mason Industries, Amber Booth Company, Peabody Noise Control, Korfund Dynamics Corporation, Vibration Mountings and Equipment, or Vibration Eliminator Co. provided they meet the requirements of this specification. Mason Industries model numbers have been used in this specification to establish quality of components. Products of the other listed manufacturers are acceptable provided their systems strictly comply with intent, structural design, performance and deflections of the base manufacturer. 2. Seismic Restraints and Vibration Isolation Types a. General 1) Shall be capable of accepting, without failure, one-half "G" external forces, one "G" for life safety equipment. Shall maintain the equipment in a captive position, and not short circuit isolation during normal operating conditions. Isolators shall have provisions for bolting and welding to the structure. 2) Attachment plates to be cast into housekeeping pads, concrete inserts, beam clamps, etc. that may be required for seismic compliance, shall be provided by this section.

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3) Housekeeping pad attachment shall be designed and certified by this section. Materials and labor required shall be by the concrete section of these specifications. b. Seismic Restraints 1) Type I: Shall comply with general characteristics of spring isolator Type A with the following additional features. Isolator shall incorporate snubbing restraint in all directions, and be capable of supporting equipment at fixed elevations during installation, and have a one "G" rating. Cast or aluminum housings, except ductile iron, are not acceptable. a) Mason Ind. type SSLFH. 2) Type II: Each corner or side of equipment base shall incorporate a seismic restraint having a minimum of 5/8" thick, all directional resilient pad limit stop. Restraints shall be fabricated of plate, structural members or square metal tubing. Angle bumpers are not acceptable. Isolator shall have a one "G" acceleration rating. a) Mason Ind. Type Z-1011 or Z-1225. 3) Type III: Multiple metal cable type with approved fastening devices to equipment and structure. System to be field bolted to deck or overhead structural members using two sided beam clamps or appropriately designed inserts for concrete. All parts of the system including cables, and excluding fasteners are to be of a single supplier to assure seismic compliance. a) Mason Ind. Type SCB Seismic Restraining System 4) Type IV: Double deflection neoprene isolator (min. 0.3") encased in ductile iron or steel casing. Isolator shall have one "G" acceleration rating. a) Mason Ind. Type BR or RBA. 5) Type V: Non-isolated equipment shall be field bolted or welded (powder shots not acceptable) to the structures as required to meet seismic forces. Bolt diameter, imbedment data, and/or weld length must be shown in certified calculations as required by paragraph A.2 above. c. Vibration Isolators 1) Type A: Spring Isolator a) Having a minimum OD to OH of 0.8:1. b) Corrosion resistance were exposed to corrosive environment with: 2) (Springs cadmium plated or electro-galvanized. 3) (Hardware cadmium plated. 4) (All other metal parts hot-dip galvanized. a) Reserve deflection (from loaded to solid height) of 50% of rated deflection. b) Minimum ¼" thick neoprene acoustical base pad on underside, unless designed otherwise. c) Designed and installed so that ends of springs remain parallel. d) Non-resonant with equipment forcing frequencies or support structure natural frequency. e) Mason Ind. Type SLF. f) NOTE: SEISMIC RESTRAINT II must be used with type A spring isolator. 5) Type B: Spring isolator shall be the same as Type A with the following additional features: a) Built-in vertical limit stops with minimum ¼" clearance under normal operation. b) Tapped holes in top plate for bolting to equipment.

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c) Capable of supporting equipment at a fixed elevation during equipment installation. Installed and operating heights shall be identical. d) Adjustable and removable spring pack with separate neoprene isolation pad. e) Housing rated to accept one "G" Acceleration. f) Mason Ind. Type SLR. g) NOTE: Type B spring isolator must be bolted or welded to the structure. 6) Type C: Spring hanger rod isolator. a) Spring element (type A) seated on a steel washer within a neoprene cup incorporating a rod isolation bushing. b) Steel retainer box encasing the spring and neoprene cup. c) When used on ductwork, provide eyebolts for attachment to duct straps. d) Spring diameter and hanger box lower hole size shall allow 30 degree hanger rod misalignment. e) Mason Ind. Type 30, W30. f) NOTE: MUST BE USED WITH SEISMIC RESTRAINT III 7) Type D: Same as SEISMIC RESTRAINT IV. 8) Type E: Elastomer hanger rod isolator. a) Molded (min. 1-3/4" thick) neoprene element with projecting busing lining the rod clearance hole. Static deflection at rated load shall be a minimum of 0.35". b) Steel retainer box encasing neoprene mounting capable of supporting equipment up to four times the rated capacity of the element. c) Mason Ind. Type HD. d) NOTE: SEISMIC RESTRAINT III must be used with Type E hanger rod isolator. 9) Type F: Combination Spring/Elastomer hanger rod isolator. a) Spring and neoprene elements in a steel retainer box with the features as described for Type C and E isolators. b) Mason Ind. Type 30N. c) NOTE: SEISMIC RESTRAINT III must be used with Type F hanger rod isolator. 10) Type G: Pad type elastomer isolator. a) 0.75" minimum thickness, 50 psi maximum loading, ribbed or waffled design. b) Minimum 0.1" deflection. c) 1/16" galvanized steel plate between multiple pad layers. d) Load distribution plate where attachment to equipment bearing surface is less than 75% of the pad area. (Type "GM") e) Mason Ind. Type Super W pad. f) NOTE: Bolting required for seismic compliance. Neoprene and duck washers and bushings shall be provided to prevent short circuiting. 11) Type H: Pad type elastomer isolator. a) Laminated canvas duck and neoprene, maximum loading 1000 psi, minimum ½" thick. b) Load distribution plate where attachment to equipment bearing surface is less than 75% of the pad area. (Type "HM") c) Mason Ind. Type HL pad.

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d) NOTE: Bolting required for seismic compliance. Neoprene and duck washers and bushings shall be provided to prevent short circuiting. 12) Type I: Thrust restraints. a) A spring element similar to Type A isolator shall be combined with steel angles, backup plates, threaded rod, washers and nuts to produce a pair of devices capable of limiting movement of air handling equipment to ¼". b) Restraint shall be easily converted in the field from a compression type to tension type. c) Unit shall be factory precompressed. d) Thrust restraints shall be installed on all cabinet fan heads, axial or centrifugal fans whose thrust exceeds 10% of unit weight. e) Mason Ind. Type WB 13) Type J: Steel Rails. a) Steel members of sufficient strength to prevent equipment flexure during operation. b) Height saving brackets as required to reduce operating height. c) Mason Ind. Type ICS or R. 14) Type K: Pipe anchors. a) All directional acoustical pipe anchor, consisting of a telescopic arrangement of two sizes of steel tubing separated by a minimum of ½" thickness of Type H pad. b) Vertical restraints shall be provided by a similar material arranged to prevent vertical travel in either direction. c) Allowable loads on isolation materials shall not exceed 500 psi and the design shall be balanced for equal resistance in any direction. d) Must be bolted or welded to meet seismic criteria. e) Mason Ind. Type ADA 15) Type L: Isolated clevis hanger. a) Combination clevis or rod roller hanger and a Type C, (LC) E, (LE) or F, (LF) isolation hanger. b) System shall be precompressed to allow for rod insertion and standard leveling. c) Mason Ind. Type CIH 16) Type M: Flashable restrained isolator a) Shall have all features of Type B isolator. b) Shall have waterproof spring covers for adjustment or removal of springs. c) Unit shall have a structural top plate for welding or bolting of supplementary support steel. d) Isolator shall accept 2" roofing insulation and be flashed directly into the waterproofing membrane. e) To be complete with wood nailer and flashing. f) Mason Ind. Type REVRS 3. Equipment Bases a. General 1) All curbs and roof rails are to be bolted or welded to the building steel or concrete deck to attain acceleration criteria and shall be wind restrained for 100 mph wind loads. b. Type B-1: Integral Structural Steel Base.

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1) Reinforced as required to prevent base flexure at equipment startup and misalignment of driver and driven units. Centrifugal fan bases shall be complete with motor slide rails and drilled for driver and driven units. 2) Height saving brackets as required to reduce operating height. 3) Member depth shall be a minimum of 1/10 of the longest unsupported span. 4) Mason Ind. Type M, WF 5) NOTE:RESTRAINT I, II or IV must be used with Type B-1 base. c. Type B-2: Concrete Inertia Base 1) Rectangular structural concrete forms for floating foundations. Base for split case pumps shall be large enough to support elbows. The base depth shall be a minimum of 1/12 the longest span, but not less than 6" or greater than 14". Forms shall include concrete reinforcement consisting of ½" bars or angles welded in place on 6" centers both ways. A layer 1½" above the bottom and an additional top layer of reinforcing for all bases exceeding 120" in one direction. Isolators shall be set into pocket housings which are an integral part of the base construction and set at the proper height to maintain 2" clearance below the base. Base shall be furnished with templates and anchor bolt sleeves. a) Mason Ind. Type K, BMK, or KIPWF b) NOTE: RESTRAINT I, II, or IV must be used with Type B-2 base. d. Type B-4: Flashable Roof Rail System 1) Rooftop fans, condensing units, air handlers, etc., shall be mounted on continuous support piers that combines equipment support and isolation into one assembly. 2) Rails shall incorporate Type A isolators which are adjustable, removable and interchangeable after equipment has been installed. 3) The system shall maintain the same installed and operating height with or without the equipment load. 4) The system shall have full plywood nailers on all four sides, designed to accept membrane waterproofing and shall be dry galvanized or plastic coated. 5) Unit shall be supplied with flashing. 6) Curbs shall be Mason Ind. Type R-7000 having a minimum 3" rated static deflection. e. Type B-5: Roof Rail Base 1) Rails shall be constructed from structural steel angles as required to prevent flexure and misalignment under load. 2) Each rail shall be the full length of the supported equipment and be welded to a series of Type B isolators. Bolt-on angle cross ties at the ends and center shall form one rigid platform. 3) Roof Rail Type TRSLR f. Type B-6: Non-isolated Roof Curb 1) Non-isolated, curb mounted rooftop equipment shall be mounted on structural curbs that meet the one "G" acceleration criteria. 2) Curbs shall accept standard 2" roof insulation. 3) Curb shall be Mason Ind. Type B-6000. g. Type B-7: Computer Room Unit Base 1) Computer room AC units shall be welded or bolted to welded structural steel stands having a minimum ½ "G" certified lateral acceleration capabilities. 2) Stand shall have +2" of adjustment to accommodate floor irregularities.

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3) Bolting or welding required to meet seismic criteria. 4) Base shall be Mason Ind. Type CRFS-1. 4. Flexible Connectors a. All connectors shall be installed on the equipment side of shut-off valves, horizontal and parallel to shafts whenever possible. b. Type FC-1: Elastomer Connector 1) Manufactured of nylon tire cord and EPDM, both molded and cured in hydraulic presses. 2) Straight connectors to have two (2) spheres reinforced with a molded-in, external ductile iron ring between the spheres. 3) Rated at 250 psi/170°F, dropping in a straight line to 170 psi/250°F for sizes 1½" to 12". 4) Sizes 10" and 12" at 200 psi and greater operating pressure, to employ control cables with neoprene end fittings isolated from anchor plates by means of ½" bridge bearing neoprene bushings. 5) Connectors shall be pre-extended per manufacturer's recommendations to prevent elongation under pressure. 6) Minimum safety factor of 3.6:1 at maximum pressure ratings shall be certified by test reports. Submittals shall also include two test reports by independent consultants showing minimum reduction of 20 Db in vibration accelerations and 10 Db in sound pressure levels at typical blade passage frequencies. 7) Connectors bolted to Victaulic or approved equal type couplings or gate, butterfly or check valves to have a minimum 5/8" flange spacer installed between the connector and the coupling flange. 8) Neoprene in lieu of EPDM is not acceptable. c. Mason Ind. Super-Flex Types: MFTNC or MFTFU. d. Type FC-2: Flexible stainless steel hose. 1) Stainless steel hose and braid rated with 3:1 safety factor. 2) 2" and smaller with male nipples, 2-1/2" and larger with fixed steel flanges. 3) Lengths as follows:

1/2 x 9 2-1/2 x 12 10 x 26 3/4 x 10 3 x 14 12 x 28 1 x 11 4 x 15 14 x 30 1-1/4 x 12 5 x 19 16 x 32 1-1/2 x 13 6 x 20 2 x 14 8 x 22 4) Mason Ind. Type BSS, or as approved. e. Type FC-3: Unbraided exhaust hose. 1) Low pressure stainless steel angularly corrugated with flanged ends. 2) Maximum temperature of 1500 degrees F. 3) Lengths as follows:

2-1/2 x 15 8 x 22 3 x 16 10 x 26 4 x 17 12 x 28 5 x 18 14 x 30 6 x 19 16 x 32 4) Mason Ind. Type SDL-RF, or as approved. f. Type FC-4: Bronze braided flexible hose.

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1) Bronze hose and braid rated with a minimum 3:1 safety factor. (Minimum 150 PSI). 2) Copper tube ends. 3) Lengths as follows:

1/8 x 7-1/2 3/4 x 11-1/2 3 x 27 1/4 x 8-1/4 1-1/4 x 14-3/4 3-1/2 x 32 3/8 x 9 1-1/2 x 17 4 x 33 1/2 x 9-3/4 2 x 20 5 x 41 5/8 x 10 2-1/2 x 2 46 x 48 4) Mason Ind. Type BFF, or as approved.

C. Execution

1. General a. Isolation and seismic restraint system must be installed in strict accordance with the manufacturer's written instructions. Vibration isolators shall not cause any change of position of equipment resulting in stress on equipment connections. 2. Equipment Installation a. Equipment shall be isolated and restrained as per Table A in this section. b. Place floor mounted equipment on 4" high concrete housekeeping pads properly doweled or expansion shielded to the deck to meet acceleration criteria. Mount vibration isolators and/or bases on housekeeping pads. Concrete work specified in Section 033000, CAST-IN-PLACE CONCRETE. c. Additional Requirements 1) The minimum operating clearance under inertia bases shall be 2". 2) The minimum operating clearance under other bases shall be 1". 3) All bases shall be placed in position and supported temporarily by blocks or shims, as appropriate, prior to the installation of the machine, isolators and restraints. 4) The isolators shall be installed without raising the equipment. 5) After the entire installation is complete, and under full operational load, the isolators shall be adjusted so that the load is transferred from the blocks to the isolators. When the isolators are properly adjusted the blocks shall be barely free and shall be removed. Remove all debris from beneath the equipment and verify that there are no short circuits of the isolation. The equipment shall be free in all directions. 6) Install equipment with flexibility in wiring. 3. Piping and Ductwork Isolation a. All piping and ductwork is included in this section. b. Installation 1) Isolate the following piping and ductwork outside of shafts: a) All water and steam piping in mechanical rooms. b) Piping exposed on roof. c) Water piping and ductwork within 50 ft. or 100 pipe diameters (whichever is greater) from connected rotating or reciprocating equipment and pressure reducing stations. d) Control air piping, from compressor discharge to receiver. c. The isolators shall be installed with the hanger box attached to, or hung as closely as possible to the structure.

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d. The isolators shall be suspended from substantial structural members sized for 0.08" deflection at center of span, not from slab diaphragm, unless specifically permitted. e. Hanger rods shall not short circuit the hanger box. f. Horizontal suspended pipe 1¼" to 2" and all steam piping shall be suspended by Type E isolators with a minimum 3/8" deflection. Water pipe larger than 2" shall be supported by Type F isolators with a minimum 0.75" deflection or same deflection as equipment for the first three locations nearest equipment whichever is greater. 1) Type L hangers may be substituted for the above. g. Ductwork shall be supported by Type C hangers with 1" minimum deflection. h. Horizontal floor and roof supported pipe shall be the same as C.3.f except use isolator Type D and Type A, respectively. i. Vertical riser pipe supports under 2" diameter shall utilize type H isolation. j. Vertical riser guides, if required shall avoid direct contact of piping with the building. k. Pipe anchors or guides where required, shall utilize Type K isolators. l. Riser sway supports, where required, shall utilize two (2) neoprene elements (Type G or H) to accommodate tension and compression forces. m. Install TYPE FC-1 (FC-4 for ) flexible connectors at all connections of pipe to equipment such as pumps, chillers, cooling towers and as shown on the drawings. n. Install FC-2, FC-3 or FC-4 type connectors only at locations which exceed temperature or service (such as gas, fuel oil or freon) limitations of FC-1. o. For control air piping, provide two flexible connectors Type FC-2 90 degrees to each other in the compressor discharge piping to the receiver. When the receiver is remote from the compressor, isolate the piping between the compressor and receiver with Type C isolators having 3/8" deflection. The receiver shall be isolated with Type D isolators having 3/8" deflection. 4. Seismic Restraints a. Installation 1) All floor mounted equipment whether isolated or not shall be bolted or welded to the structure to allow for required acceleration. Bolt points, diameter of inserts, imbedment depth and weld length as shown on the approved submittal drawings shall be followed in all respects. 2) All suspended equipment shall be four point independently braced with Type III restraints, installed taught for non-isolated equipment, piping or ductwork and slack with ½" cable deflection for isolated equipment. a) Piping, Schedule 10, 20 or 40 weld or Victaulic or approved equal braced at a maximum of 40 foot intervals and at turns of more than 4 feet. b) Piping, lateral bracing at 80 foot intervals. c) No-hub piping to be braced at 20 foot intervals (or 40 foot using appropriately rated seismic couplings) as required. d) Ductwork to be braced a maximum of every 40 feet and at every turn and at run ends. Lateral bracing shall be every 60 feet. 3) Seismic restraints are not required on the following: a) Gas piping less than 1" ID. b) Piping in mechanical equipment room less than 1¼" ID. c) Other piping less than 2½" ID. d) All rectangular ducts less than 6 sq. ft. in cross sectional area.

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e) All round ducts less than 28" diameter. f) All clevis hung pipe suspended by individual hangers 12" in length (6" in length for fire protection mains) or less from the top of the pipe support to the bottom of the support for the hanger. g) All top supported ducts suspended by hangers 12" or less in length from the top of the duct to the bottom of the support for the hanger. 4) Chimneys and stacks passing through floors are to be bolted at each floor level or secured above and below each floor with riser clamps. 5) Chimneys and stacks running horizontally to be braced every 30 feet with Type III restraint. 6) Where base anchoring of equipment is insufficient to resist seismic forces, restraints such as Type III shall be located above the units center of gravity to suitably resist "G" forces. 7) NOTE: Vertically mounted tanks may require this additional restraint. 8) For overhead support equipment, overstress of the building structure must not occur. Bracing may occur from: a) Flanges and structural beams. b) Upper or lower truss chords in bar joists. c) Cast in place inserts or drilled and shielded inserts in concrete structures. 9) Pipe risers through cored shafts require no additional seismic bracing. (Core diameters to be a maximum of 2" larger than pipe OD.) b. Non-isolated Equipment Installation 1) HVAC a) All ceiling suspended pipe and duct not excluded by diameter or distance from structure allowances. 2) Restraint Type III or V a) All ceiling suspended equipment including but not limited to tanks, stacks and VAV boxes. 3) Restraint Type III or V a) NOTE: If VAV units are rigidly attached to duct (no flex) they shall be considered ductwork. b) All diffusers in acoustical tile ceilings to be four point independently cable braced unless ceiling meets seismic Zone 2 requirements. In such case earthquake clips, or other approved means of positive attachment shall secure fixture to T-bar structure. 4) Restraint Type III a) All floor mounted equipment and tanks. 5) Restraint Type III or V a) Computer room AC units. Bolted to floor mounted stands that are in turn bolted to deck. 6) Base Type B-7 a) Roof (curb) mounted, AC, H&V units, or fans to be mounted on seismically rated curbs. 7) Base Type B-6 5. Inspection a. Upon completion of installation of all vibration isolation devices, the local representative shall inspect the completed project and certify in writing to the Contractor that all systems are installed properly, or require correction. The contractor shall submit a report to DCAMM’s Project Manager, including the

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representative's report. Certify correctiveness of the installation or detailing corrective work to be done.

TABLE A

ON GRADE ABOVE GRADE

EQUIPMENT HP MTNG ISOL DEFL BASE RESTR ISOL DEFL BASE RESTR Absorption Mach. Flr GM .10 -- V B .75 J* V AC Units (Dx) Flr D - .30 ------IV - A .75 J* -- I, II I, II Clg F .75 Air Compressors to 10 Flr D .30 -- B- IV A .75 -- B- I, II I, II Tank or Unitary > 10 Flr A .75 2 II A 1.50 2 Air Cooled Cond. Fir ------A 2.50 B-4 -- or Chillers Axial Fans Flr D - .30 - -- -- IV - A** See -- -- I, II I, II Clg - F Guide Base Mounted Pumps to 15 Flr D .30 B-2 IV A .75 B-2 I, II I, II > 15 Flr D .30 B-2 IV A 1.50 B-2 Boilers Flr GM .10 -- V B .75 -- V Cabinet Fans & To 1 Flr D .30 - -- IV - D .35 -- IV Clg - - -- F 35 -- III Packaged A.H.U. > 1 Flr A .75 - -- I,II A** See -- I,II Clg - - -- - F Guide -- III Centrif. Chillers Flr D .30 J* IV B 1.50 J* V Centrif. Fans Flr D - .30 - B-1 IV - A** See B-1 I, II III Arr. 1 & 3 Clg - *** F Guide *** Arr. 9 & 10 Flr D - .30 - J -- IV - A** See J J I, II III Clg - F Guide Computer Rm Units Flr D - .30 - B-7 IV - A .75 B-7 - I, II III Clg - -- F .75 - Condensate Pumps Flr D .30 J IV D .30 J IV Cooling Towers Flr B .75 -- V M 2.50 -- V Curb Mtd. Equip. Roof ------B-6 V Reciprocating or Screw Flr D - .30 - -- -- IV B 1.50 -- B- V V Chillers Clg - A 2.50 4 Fan Coil Units Flr D - .30 - -- -- IV A .75 -- -- I, II III Clg - C .75

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Unit/Cab. Heaters Clg ------E .30 -- III

*Used on vertically arranged units. Rails to be 1-1/2 times the unit height. DEFL. GUIDE

** Substitute TYPE B isolator for roof installations. RPM DEFL ***Substitute TYPE B-2 base for Class 2 & 3 fans. < 400 3.5" < 600 2.5 > 600 1.5

D. NOTES: 1. "ISOL" AND "BASE" COLUMN INDICATES LETTER TYPE AS APPEARS IN THE SPECS. 2. "MTNG" REFER TO METHOD OF SUPPORT OF EQUIPMENT FROM THE STRUCTURE. 3. "SEE GUIDE" INDICATES ISOLATOR DEFLECTION SELECTION TO BE TAKEN FROM RPM/DEFLECTION GUIDE AT BOTTOM OF TABLE.

2.100 REFRIGERANT MONITORING AND DETECTION (MULTIPLE POINT)

A. Provide a refrigerant sensitive infrared based stationary refrigerant gas leak monitor system designed to measure the level of multiple refrigerant gas compounds in multiple monitoring areas. The monitor equipment shall be a multiple area, self-contained wall or rack mounted device, recommended for eye level installation with remote air probes located in the air flow path of the area where refrigerant gases are most likely to concentrate. Monitoring system shall support compliance with ANSI/BSR ASHRAE 15 Mechanical Safety Code requirements.

1. The monitor shall be capable of being programmed per application for the selected refrigerant gas per area monitored at the specified accuracy for each refrigerant gas in PPM (parts per million) concentrations as specified in Table "A" herein. 2. The monitor shall automatically and continuously monitor for selected multiple refrigerant gases and compare concentrations to user-settable PPM limits per areas monitored for selected gas per area, as specified in Table "A" herein. 3. The monitor shall be of infrared non-dispersive detection type technology with factory calibrated settings for all selected . Measurement range for each refrigerant gas selected shall be as specified in Table "A", with an accuracy as a percentage of full scale in ambient temperature ranges of 32 degrees F to 122 degrees F, (0 degrees C to 50 degrees C), and 5% to 90% ambient humidity, (non-condensing). 4. The monitor shall adhere to a temperature drift tolerance of 0.3% per degree C and have a sensitivity of 1 PPM (parts per million). 5. Sampling shall be continuous with response time ranges from 5 to 90 seconds, depending on the sample tube length and gas concentration per area measured. 6. The monitor shall be equipped with three (3) relays, indicator lights, and digital readout. Standard RS-232C datalink communication port shall be standard with every refrigerant

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gas monitor unit. Contact terminal for RS-232C interface with DB25 connector port shall be standard. (Full Range of 4-20mA and RS485 local and remote communications shall be optional.) 7. The monitor shall allow user to review area settings, including the current gas level reading, and the time the reading occurred from the front face panel. The monitor shall allow user to retrieve, from the onboard 3-1/2" floppy diskette, the following data from each area: peak daily leak rate, date, and time of peak. The data shall be in ASCII format for interface with spreadsheet or data processing software. 8. Two alarm levels shall be provided indicating "alarm" and "spill" conditions. Thresholds for both alarms are to be individually field adjustable with a factory setting of 200 PPM for "alarm" and 300 PPM for "spills". To minimize false alarms, the unit’s minimum/maximum alarm and spill levels should be set at factory recommended settings in compliance with ASHRAE Safety Code 34 allowable exposure levels. 9. There shall be three (3) relays in the monitor unit. Three (3) relays shall be available for customer connections. All relays shall be rated at: 120 VAC at 5 AAC. a. ALARM: The Alarm relay connection shall be provided for the addition of an audible or visual warning device. This relay will "energize" in the event that an area’s Alarm level has been exceeded. b. FAULT: The Fault relay has been provided for an external indicator in the event unit malfunction or failure occurs. If an alarm indicator is attached, normally open to common, the alarm will be activated in the event of a system fault or malfunction. c. SPILL: The Spill relay connection shall be provided for the addition of an audible/visual warning device or an exhaust ventilation fan. This relay shall "energize" in the event an area’s Spill level has been exceeded. 10. Unit power consumption shall be less than 200 Watts maximum 120 volts AC and be capable of running on 50 to 60 Hz power supply. 11. Unit must automatically purge with fresh air for calibration verification periodically and shall have field mounted tubing to clean air source. 12. Program access to be denied by key lock to prevent unauthorized personnel from disabling the device. Program will automatically reset to full function settings allowing power interruption. Unit shall have indicator lamp to denote remote activity. 13. Unit shall operate even though a fault occurs. A fault indicator light shall provide operator with indication of a system fault. 14. The monitor will have a warranty period of one (1) year from the date of shipment from the manufacturer covering defects in material and workmanship and ninety (90) days labor from date of shipment within the continental United States. 15. The enclosure size shall not be more than 19 inches wide, 26 inches in length, and 9 inches deep, (mounting hardware provisions excluded), and the weight shall be nominally 54 pounds (shipping carton weight excluded). 16. Access to the inside of the enclosure shall be provided through a security key lock device positioned on the monitor front panel. Wiring connections shall be through electrical knock-out ports located on the bottom panel of the enclosure. 17. The monitor system shall require no periodic maintenance other than periodic checking and replacement of filters. Periodic checking or adjustments of the unit shall be capable of being accomplished by one person at the unit location. 18. The monitor shall be of the sample draw type with an internal pump and filters to draw gas samples to the monitor from a minimum of seven (7) different areas and sequentially measure the gas concentrations from a maximum of 500 feet from each monitoring area. The system shall provide visual alarm indication when preset levels are exceeded. Relay outputs for the purpose of external alarms or control shall be provided.

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19. The number of required areas to be monitored shall be expandable through the addition of an expansion module, in multiples of eight (8) areas for each expansion unit, to maximize the total number of monitoring areas at thirty-one (31) for maximum coverage of monitoring areas. 20. The expansion module shall be free standing and mount adjacent to the main monitoring unit within a six foot distance. The expansion unit shall derive all basic operating functions through a DB50 connector cable supplied with each expansion unit. 21. Fittings suitable for the connection of 1/4" O.D. tubing shall be provided on the side of the enclosure of the main monitor unit and all expansion modules, for the purpose of connecting the air sample and exhaust line. 22. The refrigerant monitor shall be ETL listed, or equivalent, for the United States and and conform to UL Standards 3101.1-U.S. and #102419-CAN/SSA C22.2 No. 1010.1.

Table A

FACTORY RECOMMENDED Alarm Set Range and Recommended Settings Refrigerant Allowable Alarm Set Range *Recommended (PPM) (PPM) Settings (PPM) Exposure level ASHRAE 34 Alarm Set Point Spill Set Point Alarm Spill Min. Max. Min. Max. 200 300 CFC: R11 1000 100 990 110 1000 200 300 CFC: R12 1000 25 990 35 1000 200 300 R113 1000 25 990 35 1000 200 300 R114 1000 25 990 35 1000 200 300 R502 1000 25 990 35 1000 200 300 HCFC: R22 1000 25 990 35 1000 200 300 R500 1000 25 990 35 1000 200 300 R503 1000 25 990 35 1000 200 300 HCFC: R123 30 15 990 25 1000 15 30 HFC: AZ20 1000 25 990 35 1000 200 300 HP62 1000 25 990 35 1000 200 300 HP81 1000 25 990 35 1000 200 300 R134a 1000 25 990 35 1000 200 300 AC9000 1000 25 990 35 1000 200 300 AZ50 1000 25 990 35 1000 200 300 R-60 (R407A) 1000 25 990 35 1000 200 300 R-66 (R407C) 1000 25 990 35 1000 200 300 MP39 1000 25 990 35 1000 200 300 HP80 1000 25 990 35 1000 200 300

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2.101 REFRIGERANT MONITORING AND DETECTION (SINGLE POINT)

A. Provide a refrigerant sensitive infrared based stationary refrigerant gas leak monitor system designed to measure the level of a single refrigerant gas compound in a single monitoring area. The monitor equipment shall be a single area, self-contained wall or rack mounted device, recommended for eye level installation with remote air probe located in the air flow path of the area where refrigerant gases are most likely to concentrate. Monitoring system shall support compliance with ANSI/BSR ASHRAE 15 Mechanical Safety Code requirements.

1. The monitor shall be capable of monitoring the selected refrigerant gas for the area monitored in a range of 10 to 1,000 ppm, at the specified accuracy of the refrigerant gas in PPM (parts per million) concentrations as specified in Table “A” herein. 2. The monitor shall automatically and continuously monitor for the selected refrigerant gas and compare concentrations to user-settable PPM limits for the area monitored, as specified in Table “A” herein. 3. The monitor shall be of infrared non-dispersive detection type technology with factory calibrated settings for the selected refrigerant. Measurement range for the refrigerant gas selected shall be as specified in Table “A”, with an accuracy as a percentage of full scale in ambient temperature ranges of 32 degrees F to 122 degrees F, (0 degrees C to 50 degrees C), and 5% to 90% ambient humidity, (non-condensing). 4. The monitor shall adhere to a temperature drift tolerance of 0.3% per degree C and have a sensitivity of 1 PPM (parts per million). 5. Sampling shall be continuous with response time ranges from 5 to 90 seconds, depending on the sample tube length and gas concentration per area measured. 6. The monitor shall be equipped with four (4) relays, indicator lights, and digital readout. (Full Range of 4-20mA, 1-5 VDC, RS-422, or RS485 local and remote communications shall be optional.) 7. The monitor shall allow user to review the area setting, including the current gas level reading, and the time the reading occurred from the front face panel. The monitor shall allow user to retrieve the following data from each area: peak daily leak rate, date, and time of peak. 8. Three alarm levels shall be provided indicating (3) independent “alarm” level conditions. Thresholds for all alarms are to be individually field adjustable with a factory setting 200 PPM for “alarm1”, 300 PPM for “alarm2", and 400 PPM for “alarm 3". To minimize false alarms, the unit’s minimum/maximum alarm levels should be set at factory recommended settings in compliance with ASHRAE Safety Code 34 allowable exposure levels. 9. There shall be four (4) relays in the monitor unit. Four (4) relays shall be available for customer connections. All relays shall be rated at: 120 VAC at 5 AAC. a. ALARM 1 The Alarm relay connection shall be provided for the addition of an audible or visual warning device. This relay will “energize” in the event that an area for Alarm 1 level has been exceeded. b. Note:Maximum ALARM 1 Level Setting of the HGM50 is 980 ppm. 1) The ALARM 1 level setting from the factory is 200 PPM. c. ALARM 2 The Alarm relay connection shall be provided for the addition of an audible or visual warning device. This relay will “energize” in the event that an area for Alarm 2 level has been exceeded. 1) Note:Maximum ALARM 2 setting of the HGM50 is 990 ppm. 2) The ALARM 2 level setting from the factory is 300 PPM.

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d. ALARM 3 The Alarm relay connection shall be provided for the addition of an audible or visual warning device. This relay will “energize” in the event that an area for Alarm 3 level has been exceeded. 1) Note:Maximum ALARM 3 setting of the HGM50 is 1000 ppm. The ALARM 3 level setting from the factory is 400 PPM. e. FAULT The Fault relay has been provided for an external indicator in the event unit malfunction or failure occurs. If an alarm indicator is attached, normally open to common, the alarm will be activated in the event of a system fault or malfunction. 10. Unit power consumption shall be less than 200 Watts maximum 120 volts AC and be capable of running on 50 to 60 Hz power supply. 11. Unit must automatically purge with fresh air for calibration verification periodically and shall have field mounted tubing to clean air source. 12. Program access to be denied by key lock to prevent unauthorized personnel from disabling the device. Operation will automatically reset to full function settings upon power interrupt. Unit shall have indicator lamp to denote remote activity. 13. Unit shall operate even though a fault occurs. A fault indicator light shall provide operator with indication of a system fault. 14. The monitor will have a warranty period of one (1) year from the date of shipment from the manufacturer covering defects in material and workmanship and ninety (90) days labor from date of shipment within the continental United States. 15. The enclosure size shall not be more than 19 inches wide, 19 inches in length, and 9 inches deep, (mounting hardware provisions excluded), and the weight shall be nominally 43 pounds (shipping carton weight excluded). 16. Access to the inside of the enclosure shall be provided through a security key lock device positioned on the monitor front panel. Wiring connections shall be through electrical knock-out ports located on the bottom panel of the enclosure. 17. The monitor system shall require no periodic maintenance other than periodic checking and replacement of filters. Periodic checking or adjustments of the unit shall be capable of being accomplished by one person at the unit location. 18. The monitor shall be of the sample draw type with an internal pump and filters to draw gas samples to the monitor from single area and measure the gas concentrations from a maximum of 500 feet from the monitoring area. The system shall provide visual alarm indication when preset levels are exceeded. Relay outputs for the purpose of external alarms or control shall be provided. 19. Fittings suitable for the connection of 1/4" O.D. tubing shall be provided on the side of the enclosure of the monitor unit, for the purpose of connecting the air sample and exhaust line. 20. The refrigerant monitor shall be ETL listed, or equivalent, for the United States and Canada and conform to UL Standards 3101.1-U.S. and #102419-CAN/SSA C22.2 No. 1010.1.

Recommended Level/Alarm Level Settings

FACTORY RECOMMENDED Alarm Set Range and Recommended Settings Refrigerant HGM50 *Recommended Alarm Set Range HGM50 Set points *AE Alarm 1 Alarm 2 Alarm 3 Alarm Alarm Alarm L Set Point Set Point Set Point 1 2 3

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(ppm )

Min Max Min Max Min Max (ppm) (ppm) (ppm) (ppm) (ppm) (ppm) (ppm (ppm) (ppm

CFC:R11 1000 100 980 100 990 120 1000 200 300 400 CFC:R12 1000 25 980 35 990 45 1000 200 300 400 R113 1000 25 980 35 990 45 1000 200 300 400 R114 1000 25 980 35 990 45 1000 200 300 400 R502 1000 25 980 35 990 45 1000 200 300 400 HCFC:R22 1000 25 980 35 990 45 1000 200 300 400 R500 1000 25 980 35 990 45 1000 200 300 400 R503 1000 25 980 35 990 45 1000 200 300 400 HCFC:R123 30 15 980 25 990 45 1000 15 30 45 HFC:AZ20 1000 25 980 35 990 45 1000 200 300 400 AZ50 1000 25 980 35 990 45 1000 200 300 400 HP62 1000 25 980 35 990 45 1000 200 300 400 HP81 1000 25 980 35 990 45 1000 200 300 400 R134a 1000 25 980 35 990 45 1000 200 300 400 AC9000 1000 25 980 35 990 45 1000 200 300 400 R60 (407A) 1000 25 980 35 990 45 1000 200 300 400 R66 (407C) 1000 25 980 35 990 45 1000 200 300 400 MP39 1000 25 980 35 990 45 1000 200 300 400 HP80 1000 25 980 35 990 45 1000 200 300 400

* Allowable Exposure Level (AEL) ASHRAE 34

2.102 AUTOMATIC TEMPERATURE CONTROL SYSTEM ELECTRIC/ELECTRONIC - NOT DIRECT DIGITAL

A. General:

1. Provide complete electric/electronic temperature control system by Johnson Controls, Inc., Landis & Staefa, Honeywell or Barber Coleman. 2. All systems shall be provided directly by the manufacturers listed above. DEALERS OR REPRESENTATIVES ARE NOT ACCEPTABLE. The manufacturer must provide full support during the guarantee.

B. Scope

1. Control system shall consist of thermostats, humidistats, temperature transmitters, controllers, automatic valves and dampers, damper operators, control panels, electrical wiring and other components required to fill intent of Specifications and provide for complete and operable system. Control equipment shall be fully proportioning, except as noted otherwise. Sequence of operation shall be as indicated on Drawings.

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2. In general this Specification morning warm up is intended to cover following: occupied unoccupied control, summer/winter changeover controls, central station air handling unit controls, hot water controls and interlocking of fans and equipment.

C. Provide services of control manufacturer to supervise related work done under other Paragraphs of this Section.

1. Installation of automatic valves, separable wells and duct humidifiers furnished under this Paragraph. 2. Provision of valved pressure taps, water drain and overflow connections and piping. 3. Provision of auxiliary contacts with buttons, switches and indicator lights in required configurations, on magnetic starters. 4. Installation of automatic dampers. 5. Provision of blank off plates (safing) for dampers that are smaller than duct size. 6. Assembly of multiple section dampers with required inter connecting linkages and shafts through duct for external mounting of damper motors. 7. Provision of baffles to eliminate stratification and provide specified air volumes, affixed permanently after stratification is eliminated. 8. Provision of access doors for service to control equipment.

D. Electric Wiring:

1. Electric wiring and wiring connections required for installation of temperature control system, as herein specified, shall be provided by temperature control manufacturer, unless otherwise indicated on Drawings. 2. Wiring shall comply with requirements of Electrical Section. 3. If a fireman’s override panel (FOP) is provided with the fire alarm system provided under the electrical section, all control wiring between FOP, motor starters and controlled devices shall be under the work of this section. This includes wiring of the pilot lights at the FOP. 4. Provide all control wiring between float switches, provided under Section 260001 ELECTRICAL WORK, in the emergency generators day tank, and the fuel oil pump set.

E. Submittal Brochure: Submit following for approval:

1. Control drawings with detailed wiring diagrams, including bill of material and description of operation for systems. 2. Panel layouts and name plate lists for local and central panels. 3. Valve and damper schedules showing size, configuration, capacity and location of equipment. 4. Data sheets for control system components.

F. Instruction and Adjustment: Upon completion of project, temperature control manufacturer shall:

1. Completely adjust and ready for use: thermostats, controllers, valves, damper operators, relays, and other components and equipment provided under this paragraph. 2. Furnish three instruction manuals covering function and operation of control systems on project for use by User Agency’s operating personnel. Competent technician shall be provided for instruction purposes.

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G. Programmed Maintenance:

1. Upon completion of installation, temperature control manufacturer shall submit to DCAMM a proposal to provide necessary programmed maintenance and to keep various control systems in proper working condition after the guarantee period. 2. Programmed maintenance agreement shall fully describe maintenance work to be performed and shall advise cost of work for subsequent years after guarantee period. This programmed maintenance proposal shall be provided free of charge at the completion of the guarantee period.

H. Room Type Instruments:

1. Modulating room thermostats shall be tamper proof. Thermostats shall have concealed adjustable setpoints. Thermostat shall be solid state with nominal 1000 ohm linear nickel wire sensing element. Element shall have positive temperature coefficient. Temperature limits shall be 0 to 125°F with operating range of 55 to 85°F. Accuracy shall be +1%. 2. Two position room thermostats shall be tamper proof without thermometers. Thermostat shall have concealed adjustable setpoints. Sensing elements shall be liquid charged. 3. Thermostats in public and multi occupancy areas shall have metal cover with tamper proof screws and satin chrome finish, with concealed adjustment without thermometer. 4. Thermostats for private offices and single occupancy type areas shall have open adjustment for use with key, exposed dial and accurate red reading thermometer. 5. Room thermostats shall be of heavy duty, all metal. 6. Heating/cooling thermostats shall be deadband.

I. sensors shall be solid state. Sensors shall consist of CAB humidity sensing elements and 1000 ohm nickel wire temperature sensing elements.

J. Automatic Control Valves:

1. Automatic control valves shall be fully proportioning with modulating plug or V port inner guides, unless otherwise specified. Fin tube radiation control valves shall be non- modulating, 2-position type. Valves shall be quiet in operation and fail safe in either normally open or normally closed position in event of control failure. Valves shall be capable of operating in sequence when required by operation. 2. Control valves shall be sized by temperature control manufacturer and shall be guaranteed to meet heating and cooling loads as specified. Control valves shall be suitable for pressure conditions and shall close against differential pressure involved. 3. Valve actuators shall be modulating sealed electro hydraulic type with spring return. Actuators shall incorporate solid state electronic internal controller circuitry. Ambient temperature range shall be 40°F to 150°F. Body pressure rating and connection type (screwed or flanged) shall conform to pipe schedule specified elsewhere. 4. Chilled water valves shall be single seated type, except that where pressure and flow combination exceeds rating for commercial valve operators, double seated valves may be used.

K. Low Temperature Safety Thermostat: Electric low temperature warning thermostats shall have 20 ft. low point sensitive elements (not averaging type) installed to cover entire duct area. Thermostats shall be two position manual reset type. Where coils are two banks, provide two freezestats wired in series to shut down supply fan, sound alarm, etc., as shown on Drawings.

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L. High Temperature Safety Thermostat: Electric high temperature thermostats shall have bi metal type sensing element with at least 10" insertion length. Thermostats shall be two position manual reset.

M. Dampers:

1. Furnish single or multiple blade automatic and smoke (UL555S) rated dampers for installation under Ductwork Paragraph as required. 2. Damper frames shall be constructed of 13 gauge galvanized sheet metal and shall have flanges for duct mounting. 3. Damper blades shall not exceed 6" in width. Blades shall be two sheets corrugated of 22 gauge galvanized sheet steel, spot welded together. Blades shall be suitable for high velocity performance. 4. Damper bearings shall be nylon. Bushings that turn in bearings shall be oil impregnated sintered metal. 5. Provide replaceable butyl rubber seals with damper on top, bottom and sides of frame and along each blade edge. Seals shall provide tight closing, low leakage damper. Submit leakage and flow characteristic charts for approval. 48" x 48" damper section shall have leakage less than 7 cfm/sf at 4" WG differential pressure. Dampers shall be Honeywell D643, Johnson D1300, Vent Products 5900, or Ruskin CD50.

N. Damper Operators:

1. Operators shall operate at varying rates of speed to correspond to dictates of controllers and variable load requirements. Operators shall operate in sequence when required. Operators shall have external adjustable stops to limit stroke in both directions. Linkage arrangement shall permit normally open or normally closed damper positions. 2. Damper operators on modulating dampers shall have full relay pilot positioners with inter connecting linkage to provide accurate positioning and control. Valve and damper actuators shall be modulating sealed electro hydraulic with spring return. Actuators shall incorporate solid state electronic internal controller circuitry. Ambient temperature range shall be 40°F to 150°F. 3. When sequencing of operators is called for, such sequencing shall be accomplished by spring ranges adequate for application.

O. Local Control Panels:

1. Controllers, relays, switches, etc. shall be mounted on enclosed control panels with hinge lock type door mounted adjacent to system controlled. Temperature settings, adjustments and calibrations shall be made at system control panel. Panel shall have canopy light and on off switch. 2. Provide remote transmission thermometers on local panels. Temperature indications shall be provided for each point of temperature measurement for control and, additionally, for those points outlined in this Section or shown on Drawings. 3. Details of each panel shall be submitted for approval prior to fabrication. Locations of each panel shall be convenient for adjustment and service. Provide engraved nameplates beneath each panel mounted control device. Manual switches, dial thermometers and indicating gauges shall be flush mounted on hinged door. 4. Electrical devices within panels shall be factory pre wired to numbered terminal strip. Wiring within panel shall be in accordance with NEMA and UL standards.

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5. Following items shall be mounted on control panels: chilled water supply and return temperature indicators, 7 day time clock, selector switches, occupied/unoccupied switch and humidity indicators.

P. Miscellaneous Devices: Provide relays, positioners, electric switches, clocks, transformers, etc. necessary to make complete and operable system. Locate these devices on local panel unless specified otherwise. Time clocks shall be seven day program type with ten hour spring reserve and manual override.

Q. Thermometers:

1. Thermometers shall be flush mounted on local panels. These thermometers shall be electronic transmission type with dials with minimum 3 1/2" diameter. Accuracy shall be +2% of full scale values. Linear scale shall be 40°F to 150°F. Indication meter shall be suitable for use with 1000 ohm temperature sensors. 2. Thermometers shall be provided for following locations for each system: a. Outside air temperature b. Entering each coil c. After each coil d. Return air e. Mixed air f. Water system supply and return.

R. Humidistats shall be fully portioning with adjustable throttling range. Humidistats shall have setpoint scales shown in percent of relative humidity located on the instrument. Systems showing moist/dry or high/low will not be acceptable.

S. Provide for each humidifier on job a duct mounted air flow switch to interrupt humidification on lack of air flow; a duct mounted high limit humidistat set to shut down humidification if its 85% R.H. (adj.) setpoint is reached and a fully modulating duct mounted controlling humidistat. Provide all control wiring between components and ATC system. Coordinate with manufacturer at belt contained electronic humidifiers to insure that output from ATC supplied humidistat is fully compatible with humidistat controls.

T. Smoke Detection and Dampers in Air Handling Units

1. Install duct smoke detectors furnished under Section 260001 – ELECTRICAL WORK where shown on Drawings. Wire to fan shutdown. Wiring to fire alarm system shall be part of work of Section 260001 – ELECTRICAL WORK. 2. Provide normally closed smoke dampers in return and supply air ducts to close automatically upon fan shutdown due to fire or smoke detection or upon manual shutdown. 3. Smoke dampers shall be controlled so that fans shall not start until dampers are open and fans shall stop before smoke dampers are fully closed. End switches, damper switches, and other components required shall be by temperature control manufacturer.

U. Optimal Logic Network

1. Provide optimal start logic network programmer to start air handling equipment to properly condition spaces prior to occupancy. Optimal time to start primary equipment shall be determined by external conditions, building construction and conditioning

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equipment. Factors to be considered in determining warm up period for air handling systems shall be type of building construction, U factor and outside air temperature. 2. Programmer shall work in conjunction with occupied unoccupied programming schedules and be equipped with precision 24 hour synchronous clock systems.

2.103 AUTOMATIC TEMPERATURE CONTROL SYSTEM, PNEUMATIC

A. General:

1. Provide complete pneumatic temperature control system by Johnson Controls, Inc., Landis & Staefa, Honeywell or Barber Coleman. 2. All systems shall be provided directly by the manufacturers listed above. DEALERS OR REPRESENTATIVES ARE NOT ACCEPTABLE. The manufacturer must provide full support during the guarantee period.

B. Scope

1. Control system shall consist of thermostats, humidistats, temperature transmitters, controllers, automatic valves and dampers, damper operators, control panels, compressed air sub system, electrical wiring and all other components required to fill intent of Specifications and provide for complete and operable system. Control equipment shall be fully proportioning, except as noted otherwise. Sequence of operation shall be as indicated on Drawings. 2. In general this Specification is intended to cover following: occupied unoccupied control morning warm up, summer/winter changeover controls, central station air handling unit controls, chilled water controls, hot water controls, condenser water controls and interlocking of fans and equipment. 3. Provide the services of control manufacturers representative to be on site during the entire time that the startup testing and balancing procedures, detailed in Part 3 of this specification, takes place. Representative shall be part of manufacturers service organization and shall be skilled in the adjustment and calibration of all control devices as well as being capable of modifying and checking system software (if any).

C. Provide supervision services of manufacturer's field engineer for following work performed under other Paragraphs of this Section:

1. Installation of automatic valves and separable wells furnished under this Paragraph. 2. Provision of valved pressure taps, water drain and overflow connections and piping. 3. Provision of auxiliary contacts with buttons, switches and indicating lights in required configurations, on magnetic starters. 4. Installation of automatic dampers. 5. Provision of blank off plates for dampers that are smaller than duct size. 6. Assembly of multiple section dampers with linkages and shafts through duct for external mounting of damper motors. 7. Provision of sheet metal baffles to eliminate stratification and provide air volumes specified, affixed permanently after stratification problem is eliminated. 8. Provision of access doors for service to control equipment. 9. Installation of duct smoke detectors furnished under Section 260001 – ELECTRICAL WORK.

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D. Electric Wiring:

1. Electric wiring and wiring connections required for installation of temperature control system, as herein specified, shall be provided by temperature control manufacturer, unless otherwise indicated on Drawings. 2. Wiring shall comply with requirements of Section 260001, ELECTRICAL WORK. 3. If a fireman’s override panel (FOP) is provided with the fire alarm system provided under the electrical section, all control wiring between FOP, motor starters and controlled devices shall be under the work of this section. This includes wiring of the pilot lights at the FOP. 4. Provide all control wiring between float switches, provided under Section 260001, ELECTRICAL WORK, in the emergency generators day tank, and the fuel oil pump set.

E. Air Piping: Install tubing in neat and workmanlike manner, of sufficient size, tested and found to be air tight. Air piping in finished spaces shall be run concealed. Polyethylene tubing shall be black type FR; tubing in plenums shall be fire retardant. Tubing type shall be provided as follows:

1. Exposed: Hard copper tubing, single tube polyethylene in metal jacket, or multi tube polyethylene with vinyl jacket. Multi tube bundles shall be terminated in panels or junction boxes. Final termination to control devices may be made with short run of single tube polyethylene. 2. Concealed: Hard or soft copper tubing, single or multi tube polyethylene. 3. Concrete Buried: Hard or soft copper tubing or polyethylene tubing enclosed in metal conduit. 4. Inside Panels and Unit Enclosures: Polyethylene tubing.

F. Submittals

1. This Paragraph supplements provisions of Paragraph SUBMITTALS. 2. Materials and equipment for which Shop Drawing or Product Data submittal is required shall include but shall not be limited to: a. Each control system. b. Control components including: 1) Temperature, humidity and static pressure sensors. 2) Pressure reducing valves. 3) Automatic control valves. 4) Automatic control smoke and stair pressurization dampers and operators. 5) Electric wiring. c. Air piping layout. 3. Submit the following for approval: a. Control drawings with detailed piping and wiring diagrams, including bills of materials and written description of operation, for each system. b. Panel faceplate layouts showing gauges, lights, indicators and switches with instrument ranges and nameplate inscriptions for local and central panels. c. Valve and damper schedules showing sizes, configurations, capacities, pressure drops and locations of equipment. d. Data sheets for control system components. e. Calculations for valve coefficients. (CV's). f. Tabulated results of calculations for compressed air consumption.

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g. Floor plans showing size and location of compressed air main and risers and locations and capacities of pressure reducing valves. 4. Provide initial and as built construction drawings to User Agency’s operating personnel. 5. Provide narrative descriptions of sequences of operation, including pneumatic input and output pressure ranges for each component and every cycle. Descriptions shall not merely duplicate specified sequences of operation.

G. Instruction and Adjustment: Upon completion of project, temperature control manufacturer shall:

1. Completely adjust and ready for use: thermostats, controllers, valves, damper operators, relays, and all other components and equipment provided under this paragraph. See additional requirements under "Startup, Testing and Balancing" paragraph in Part 3 of this Specification. 2. Furnish three instruction manuals covering function and operation of control systems on project for use by User Agency’s operating personnel. Competent technician shall be provided for instruction purposes.

H. Guarantee: Control system designed on Drawings and herein specified shall be guaranteed free from original defects in both material and workmanship for a period of one year of normal use and service, excepting damages from other causes. Guarantee shall become effective starting on date DCAMM begins to receive beneficial use of system.

I. Programmed maintenance:

1. Upon completion of installation, temperature control manufacturer shall submit to DCAMM an agreement to provide necessary programmed maintenance and to keep various control systems in proper working condition. 2. Programmed maintenance agreement shall fully describe maintenance work to be performed and shall advise cost of work for subsequent years after guarantee period. This programmed maintenance agreement shall be provided free of charge during guarantee period.

J. Room Type Instruments:

1. Room thermostats and transmitters shall be miniature, two pipe with pneumatic relay, pneumatic feedback, adjustable sensitivity and calibrated dial. 2. Thermostats in public and multi occupancy areas shall have metal cover with tamper proof screws and satin chrome finish, with concealed adjustment, without thermometer. 3. Thermostats for private offices and single occupancy areas shall have open adjustment for use with key, exposed dial and accurate red reading thermometer. 4. Transmitters shall have closed adjustment. 5. Room thermostats shall be of heavy duty, all metal. 6. Heating/cooling thermostats shall be deadband.

K. Pneumatic Transmission:

1. Pneumatic duct and immersion temperature transmitters shall be used for all applications and shall be of liquid filled capillary type incorporating pneumatic feedback signal to ensure exact and proportional relationship between measured temperature and transmitted signal. Where transmitter is used for sensing mixed air temperatures or coil discharge

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temperatures, or when duct area is in excess of 14 sq. ft., instrument shall incorporate averaging element, at least 96" long. 2. Transmitters shall transmit 3 15 lb. signal over 250°F, 50°F, 100°F, or 200°F range as required to suit each variable. 200°F transmitters shall be used only where variable changes more than 75°F. Transmitters used for sensing liquid temperatures shall be furnished with stainless steel wells. 3. Temperature and pressure controllers shall have adjustable sensitivity and submaster type instruments with adjustable ratio or reset range. Instruments shall have calibrated dials for both set point and ratio or reset range. Mount inside local panels. 4. Pneumatic thermometers as well as pressure indicators shall be dial type, minimum of 3 1/2" in diameter. Accuracy shall be +1/4% of entire range. Thermometers shall be furnished in 25°F, 50°F, 100°F, or 200°F ranges to match ranges of associated transmitters. Pneumatic thermometers and indicators shall be flush panel mounted and shall be furnished for controllers, transmitters and other points specified.

L. Automatic Control Valves:

1. Automatic control valves shall be fully proportioning with modulating plug or V port inner guides, unless otherwise specified. Valves shall be quiet in operation and fail safe in either normally open or normally closed position in event of control air failure. Valves shall be capable of operating in sequence when required by operation. 2. Control valves shall be sized by temperature control manufacturer and shall be guaranteed to meet heating and cooling loads as specified. Control valves shall be suitable for pressure conditions and shall close against differential pressure involved. 3. Valve operators shall be molded synthetic rubber diaphragm type. Body pressure rating and connection type (screwed or flanged) shall conform to pipe schedule specified elsewhere. 4. Valves sequenced with other valves or control devices shall be equipped with pilot positioners. 5. Chilled water valves shall be single seated type, except that where pressure and flow combination exceeds rating for commercial valve operators, double seated valves may be used. 6. Furnish to fan coil manufacturer, at his factory, (two way) (three way) automatic control valves. Coordinate with manufacturer as to types and sizes of connections to fan coil and required valve model numbers.

M. Low Temperature Safety Thermostat: Electric low temperature warning thermostats shall have 20 ft. low point sensitive elements (not averaging type) installed to cover entire duct area. Thermostats shall be two position manual reset type. Where coils are two banks, provide two freezestats wired in series to shut down supply fan, sound alarm, etc., as shown on Drawings.

N. High Temperature Safety Thermostat: Electric high temperature thermostats shall have bi metal type sensing element with at least 10" insertion length. Thermostats shall be two position manual reset type.

O. Dampers:

1. Furnish single or multiple blade automatic and smoke (UL555S) rated dampers, as required for installation under Ductwork Paragraph. 2. Damper frames shall be 13 gauge galvanized sheet metal with flanges for duct mounting.

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3. Damper blades shall not exceed 6" wide. Blades shall be two corrugated sheets of 22 gauge galvanized sheet steel, spot welded. Blades shall be suitable for high velocity. 4. Damper bearings shall be nylon. Bushings that turn in bearings shall be oil impregnated sintered metal. 5. Provide replaceable butyl rubber seals with damper. Seals shall be installed along top, bottom and sides of frame and along each blade edge. Seals shall provide tight closing, low leakage damper. Leakage and flow characteristic charts must be submitted prior to approval of dampers. 48" x 48" damper section shall have leakage less than 7 cfm/sf at 4" WG differential pressure. Dampers shall be Honeywell D643, Johnson D1300, Ruskin CD50, or Vent Products 5900.

P. Damper Operators:

1. Provide molded rubber diaphragm piston damper operators, fully proportioning unless otherwise specified. Operator shall operate quietly and shall position dampers accurately and smoothly. Mount operators outside air stream. 2. Operators shall operate at varying rates of speed to correspond to controller and variable load requirements. Operators shall operate in sequence when required. Operators shall have external adjustable stops to limit stroke in both directions. Operator linkage arrangement shall permit normally open or normally closed damper positions as required. 3. Damper operators mounted on modulating dampers shall have full relay pilot positioners with interconnecting linkage to provide accurate positioning and control by mechanical feedback. 4. When sequencing of operators is called for, such sequencing shall be accomplished by spring ranges adequate for application.

Q. Local Control Panels:

1. Controllers, relays, switches, and other control components shall be mounted on enclosed control panels with hinge lock door mounted next to system controlled. Temperature settings, adjustments and calibrations shall be made at system control panel. Panel shall have canopy light and on off switch. 2. Provide remote transmission thermometers on local panels. Temperature indications shall be provided for each point of temperature measurement for control and, additionally, for those points outlined in this Section or shown on Drawings. Refer to Thermometers specification. 3. Details of each panel shall be submitted for approval prior to fabrication. Locations of each panel shall be convenient for adjustment and service. Provide engraved nameplates beneath each panel mounted control device. Manual switches, dial thermometers and indicating air gauges shall be flush mounted on hinged door. 4. Electrical devices within panels shall be factory prewired to numbered terminal strip. Wiring within panel shall be in accordance with NEMA and UL standards. 5. Following items shall be mounted on control panels: chilled water supply and return temperature indicators, 7 day time clock, selector switches, occupied/unoccupied switch and humidity indicators.

R. Gauges: Provide at least 2" diameter air pressure indicating gauges to indicate supply and control pressures at controllers, relays, pneumatic electric switches, valves, damper operators, duct controllers, and other points throughout system where visual indication of air pressure is required or will prove beneficial to operating personnel in operation of control system. Air gauges will not be required on room type thermostats.

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S. Miscellaneous Devices:

1. Provide relays, cumulators, three way air valves, positioners, pneumatic electric switches, three way solenoid valves, two way and three way air switches, clocks, transformers, etc. necessary to make complete and operable system. Locate these devices on local panel unless specified otherwise. Time clocks shall be seven day program type with ten hour spring reserve and manual override. 2. Inlet vane actuators for variable volume fans shall be heavy duty, reversible, pneumatic type for mounting on fan assembly, with torque of 120" lbs. minimum.

T. Pneumatic Gauges

1. Provide one pneumatic gauge for each controller located in control panel. Provide one gauge for each damper, valve and inlet vane actuator.

U. Thermometers:

1. Thermometers shall be flush mounted on local panels. These thermometers shall be pneumatic transmission type with dials with minimum 3 1/2" diameter. 2. Thermometers shall be provided for following locations for each system: a. Outside air temperature b. Entering each coil c. After each coil d. Return air e. Mixed air f. Water system supply and return.

V. Compressed Air Supply:

1. Provide duplex high pressure electric air compressor consisting of two compressing units mounted on single air receiver where indicated on Drawings. a. Size each compressor for 300% of compressed air consumption stated in reviewed consumption calculation tabulation. Size receiver to limit starts per hour to six. b. Compressors shall be oil lubricated and belt driven, with tabulation belt guards. c. Air receiver shall meet requirements of ASME Standards for installation of this type. d. Provide magnetic starters and automatic alternator arranged for even compressor wear. Alternator shall be arranged so that different unit will start each time air pressure drops below required set pressure, and shall provide for operation of standby compressor upon failure of first unit or inability of first unit to meet air requirements. e. Each compressor motor shall be provided with its own separate disconnect and starter, wired from a common feed. f. Provide automatic drain trap to eliminate moisture from air receiver; pipe to nearest floor drain. 2. Air Dryer: Provide continuous operating refrigerant compressed air dryer. a. Dehydrator shall have tube in tube heat exchanger, mechanical condensate separator and condensate discharge valve trap mechanism. b. Dehydrator shall be designed for 100# maximum operating pressure. c. Effluent air shall have dewpoint of less than 15°F when reduced to control operating pressure required.

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d. Provide dryer bypass. 3. Air Filter Assembly: Provide necessary coalescing filter and air reducing station to provide oil-free air to devices at required pressures. Reducing station shall maintain required reduced pressure within maximum variance of 0.25 psig. Provide filter bypass.

W. Humidistats shall be fully portioning with adjustable throttling range. Humidistats shall have setpoint scales shown in percent of relative humidity located on the instrument. Systems showing moist/dry or high/low will not be acceptable.

X. Provide for each humidifier on job a duct mounted air flow switch to interrupt humidification on lack of air flow; a duct mounted high limit humidistat set to shut down humidification if its 85% R.H. (adj.) setpoint is reached and a fully modulating duct mounted controlling humidistat. Provide all control wiring between components and ATC system. Coordinate with manufacturer at belt contained electronic humidifiers to insure that output from ATC supplied humidistat is fully compatible with humidistat controls.

Y. Smoke Detection and Dampers in Air Handling Units

1. Install duct smoke detectors furnished under Section 260001 – ELECTRICAL WORK where shown on Drawings. Wire to fan control. Wiring to fire alarm system shall be part of work of Section 260001 – ELECTRICAL WORK. 2. Provide normally closed smoke dampers in return and supply air ducts to close automatically upon fan shutdown due to fire or smoke detection or upon manual shutdown. 3. Smoke dampers shall be controlled so that fans shall not start until dampers are open and fans shall stop before smoke dampers are fully closed. End switches, damper switches, and other components required shall be by temperature control manufacturer.

Z. Aspirating Wall Boxes: Provide aspirating wall boxes for pneumatic room thermostats where shown on Drawings. Boxes shall be designed to provide thermostat protection and smooth wall appearance. Each box shall have aspirating nozzle to pass small fixed amount of supply air to draw room air across thermostat sensing element

AA. ARefer to Drawings for HVAC control sequences.

2.104 AUTOMATIC TEMPERATURE CONTROLS (DIRECT DIGITAL CONTROL)

A. General

1. Provide complete direct digital (DDC) system of automatic temperature control system by: a. Johnson Controls, Inc. b. Landis & Staefa c. Honeywell d. Barber Coleman e. The new DDC system must be 100% compatible and capable of seamless communication with the existing fill in DDC systems. f. All systems shall be provided directly by the manufacturers listed above. DEALERS OR REPRESENTATIVES ARE NOT ACCEPTABLE. The manufacturer must provide full support throughout the guarantee period.

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2. Provide the services of control manufacturers representative to be on site during the entire time that the startup testing and balancing procedures, detailed in Part 3 of this specification, takes place. Representative shall be part of manufacturers service organization and shall be skilled in the adjustment and calibration of all control devices as well as being capable of modifying and checking system software. 3. Certify maintenance of local office within 50 mile radius of job site, staffed with factory trained engineers capable of providing instructions to User Agency’s personnel, and performing routine and emergency maintenance on ALL system components. Upon Designer ’s request, submit list of personnel staffing field office and their professional disciplines. 4. Provide DDC system supplier's warranty of performance of entire system, including pneumatic components, as required by Contract documents. Performance and components requirements are established by control sequences and diagrams on Drawings and by this Paragraph. 5. DDC components shall be capable of proportional-integral-derivative (PID) control. Pneumatic components shall be fully proportioning unless otherwise noted. 6. DDC system shall perform all sequences of operation which may be listed on control drawings or attached to this specification. Controls supplier shall provide all devices necessary to completely perform sequences whether such devices are explicitly shown on the drawings specified, or not shown or specified.

B. Submittals

1. This Paragraph supplements provisions of Submittals Paragraph of this Section. 2. Materials and equipment for which Shop Drawing and Product Data submittal are required shall include but shall not be limited to: a. Each control system. b. Control components including: 1) temperature, humidity, current and static pressure sensors, 2) direct digital field control panels, 3) pressure reducing valves, 4) automatic control valves, 5) automatic control smoke and stair pressurization dampers and operators, 6) electric wiring, 7) transducers, and 8) solenoids and other electrical components. c. Air piping layout. d. I/O devices (including CRT, line printer, modems and necessary interface devices). e. Software. f. Point list. g. Detailed network diagram showing DDCFPs and communication links. 3. Submit the following for approval: a. Control drawings with detailed piping and wiring diagrams, including bills of materials and written description of operation, for each system. b. Panel faceplate layouts showing gauges, lights, indicators and switches with instrument ranges and nameplate inspections for local and central panels. c. Valve and damper schedules showing sizes, configurations, capacities, pressure drops and locations of equipment. d. Data sheets for control system components. e. Complete software information including names of software packages provided, control sequences performed including flow chart logic diagrams, complete

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information on user programmability (commands, language details, programming sequences, etc.), and complete description of operating system. f. Calculations for valve coefficients (CVs). g. Tabulated results of calculations for compressed air consumption. h. Floor plans showing sizes and locations of compressed air mains and risers and locations and capacities of pressure reducing valves. i. Detailed drawings of CRT with keyboard and printer. 4. Provide initial design and as built construction drawings to User Agency’s operating personnel. 5. Provide narrative descriptions of sequences of operation, including input and output air pressure for each pneumatic component. Descriptions shall not merely duplicate specified sequences of operations.

C. Provide services of control supplier's field engineer to supervise work specified in other Paragraphs of this Section:

1. Installation of automatic valves and separable wells furnished under this Paragraph. 2. Provision of necessary valved pressure taps, water drain and overflow connections and piping. 3. Provision of auxiliary contacts on magnetic starters with buttons and switches in required configurations. 4. Installation of automatic dampers. 5. Provision of blank off plates (safing) required to install dampers smaller than duct size. 6. Assembly of multiple section dampers with interconnecting linkages and extension of shafts through duct for external mounting of damper motors. 7. Provision of sheet metal baffle plates to eliminate stratification and provide air volumes specified. Locate by experimentation; affix permanently when stratification is eliminated. 8. Provision of access doors or other approved means of access through ducts for service to control equipment.

D. Guarantee control system free from defects in material and workmanship and guarantee performance of systems as required by Contract Documents for one year of normal use and service beginning on date DCAMM begins to receive beneficial use of system.

E. Programmed Maintenance, Startup and Software Update

1. Submit manufacturer's agreement to provide necessary programmed maintenance and to maintain systems for one year from date of Final Acceptance, within Contract sum. 2. Programmed maintenance agreement shall identify maintenance work to be performed and shall quote cost of work for two years subsequent to guarantee period. 3. Start system and perform necessary testing and debugging. Perform acceptance test in presence of DCAMM’s Project Manager and Designer. Provide 15 days notice before acceptance test. Notice shall certify that system is complete and operates as required by Contract Documents. When system performance is deemed satisfactory, system parts will be accepted for beneficial use warranty shall begin. Note additional requirements in Part III of this specification. 4. Update software free of charge during warranty as manufacturer's software is improved. 5. Provide 40 hours of on site instruction in operating DDC system. Furnish three copies of operating manuals for complete system.

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6. Computer to support color graphics software package shall have the following requirements: a. Current model Intel processor, capacity and speed suitable for system. b. 101 key “qwerty” keyboard with numeric keypad. c. Flat screen monitor, capable of displaying at a resolution of 1028 x 760 minimum, 20 inches minimum. d. Microsoft mouse with minimum of two buttons and scroll wheel. e. Current operating system with Office Suite 2007, Professional Edition. f. CD-ROM reader and writer. g. Internal modem suitable for system and connection. h. Laserjet color printer (Hewlett-Packard, Epson).

F. Operator Interface

1. Basic Interface Description: a. Command Entry/Menu Selection Process: Operator Workstation interface software shall minimize operator training through the use of English language prompting, English language point identification, and industry standard PC application software. 1) The operator interface shall minimize the use of a typewriter style keyboard through the use of a mouse or similar pointing device, and "point and click" approach to menu selection. For example, users shall be able to start and stop equipment or change setpoints from graphical displays through the use of a mouse or similar pointing device. b. Graphical and Text-Based Displays: At the option of the user, Operator Workstations shall provide consistent graphical or text-based displays of all system point and application data described in this specification. Point identification, engineering units, status indication, and application naming conventions shall be the same at all operator devices. c. Multiple, Concurrent Displays: The Operator Interface shall provide the ability to simultaneously view several different types of system displays in a windowing environment to speed facility operation and analysis. For example, the interface shall provide the ability to simultaneously display a graphic depicting an air handling unit, while displaying the trend graph of several associated space temperatures to allow the user to analyze system performance. If the interface is unable to display several different types of displays at the same time, the FMS contractor shall provide at least two operator stations. d. Password Protection: Multiple-level password access protection shall be provided to allow the user/manager to limit workstation control, display and data base manipulation capabilities as he deems appropriate for each user, based upon an assigned password. 1) Passwords shall be exactly the same for all operator devices, including DDC panel portable or panel mounted network terminals. Any additions or changes made to password definition shall automatically cause passwords at all DDC panels on a network to be updated and downloaded to minimize the task of maintaining system security. Users shall not be required to update passwords for DDC panels individually. 2) A minimum of five levels of access shall be supported: 3) A minimum of 50 passwords shall be supported at each DDC panel. 4) Operators will be able to perform only those commands available for their respective passwords. Menu selections displayed at any operator device,

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including portable or panel mounted devices, shall be limited to only those items defined for the access level of the password used to log-on. 5) User-definable, automatic log-off timers of from I to 60 minutes shall be provided to prevent operators from inadvertently leaving devices on-line. e. Operator Commands: The operator interface shall allow the operator to perform commands including, but not limited to, the following: 1) Start-up or shutdown selected equipment 2) Adjust setpoints 3) Add/Modify/Delete time programming 4) Enable/Disable process execution 5) Lock/Unlock alarm reporting for each point 6) Enable/Disable Totalization for each point 7) Enable/Disable Trending for each point 8) Override PID Loop setpoints 9) Enter temporary override schedules 10) Define Holiday Schedules 11) Change time/date 12) Enter/Modify analog alarm limits 13) Enter/Modify analog warning limits 14) View limits 15) 7Enable/Disable Demand Limiting for each meter 16) Enable/Disable Duty Cycle for each load f. Logs and Summaries: Reports shall be generated automatically or manually, and directed to either CRT displays, printers, or disk files. As a minimum, the system shall allow the user to easily obtain the following types of reports: 1) A general listing of all points in the network 2) List all points currently in alarm 3) List of all off-line points 4) List all points currently in override status 5) List of all disabled points 6) List all points currently locked out 7) List of all items defined in a "Follow-Up" file 8) List all Weekly Schedules 9) List all Holiday Programming 10) List of Limits and Deadbands 11) Summaries shall be provided for specific points, for a logical point group, for a user-selected group of groups, or for the entire facility without restriction due to the hardware configuration of the facility management system. Under no conditions shall the operator need to specify the address of hardware controller to obtain system information. g. Paging Interface Software: The Operator Workstation shall be capable of transmitting alarms to both numeric and alphanumeric pager messages. The message sent to an alphanumeric pager can include the critical alarm text and optionally a description of what action to take. The scheduling feature shall allow time of day pagers are enabled, up to four enable/disable periods a day for each pager. The application shall be password protected and capable of supporting 1500 pagers. 2. Third Party Software Interaction: a. Third Party Interface System data, including transactions, alarms, totalization files, etc., shall be stored on the workstation disk drive in an industry standard database

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format (e.g., dbase IV) such that it is compatible with off the shelf third party database and spreadsheet programs. b. Live FMS Data Exchange 1) The Facility Management System shall interface to off-the-shelf personal computer software programs (e.g., Microsoft Word for Windows, Microsoft Excel, Lotus, etc.) This interface shall conform to Microsoft Corporation's Dynamic Data Exchange (DDE) protocols and standards. The user shall have the ability to "link" the computer programs directly to live, real-time Facility Management System data values. Systems that offer data exchange using only historical, disk resident information will not be acceptable. FMS data value "reads" and "writes" shall both be permissible. 3. Dynamic Color Graphic Displays: 1. Color graphic floor plan displays, and 2. system schematics (for each piece of mechanical equipment; including air handling units, chilled water systems, and hot water boiler systems,) shall be provided as a part of this contract. The total quantity shall be . a. A System Selection/Penetration: The operator interface shall allow users to access the various system schematics and floor plans via a graphical penetration scheme, menu selection, or text-based commands. b. Dynamic Data Displays: Dynamic temperature values, humidity values, flow values, and status indication shall be shown in their actual respective locations, and shall automatically update to represent current conditions without operator intervention. c. Windowing: The windowing environment of the PC Operator Workstation shall allow the user to simultaneously view several graphics at the same time to analyze total building operation, or to allow the display of a graphic associated with an alarm to be viewed without interrupting work in progress. d. Graphics Definition Package: Graphic generation software shall be provided to allow the user to add, modify, or delete system graphic displays. 1) The FMS contractor shall provide libraries of pre-engineered screens and symbols depicting standard air handling unit components (e.g. fans, cooling coils, filters, dampers, etc.), complete mechanical systems (e.g. constant volume-terminal reheat, VAV, etc.) and electrical symbols. 2) The graphic development package shall use a mouse or similar pointing device in conjunction with a drawing program to allow the user to perform the following: 3) (Define symbols 4) (Position and size symbols 5) (Define background screens 6) (Define connecting lines and curves 7) (Locate, orient and size descriptive text 8) (Define and display colors for all elements 9) (Establish correlation between symbols or text and associated system points or other displays. 4. System Configuration and Definition: All temperature and equipment control strategies and energy management routines shall be definable by the operator. System definition and modification procedures shall not interfere with normal system operation and control. a. The system shall be provided complete with all equipment and documentation necessary to allow an operator to independently perform the following functions: 1) Add/Delete/Modify Standalone DDC Panels 2) Add/Delete/Modify Operator Workstations 3) Add/Delete/Modify Application Specific Controllers

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4) Add/Delete/Modify points of any type, and all associated point parameters, and tuning constants. 5) Add/Delete/Modify alarm reporting definition for each point. 6) Add/Delete/Modify control loops 7) Add/Delete/Modify energy management applications 8) Add/Delete/Modify time-(and calendar-) based programming. 9) Add/Delete/Modify Totalization for every point 10) Add/Delete/Modify Historical Data Trending for every point 11) Add/Delete/Modify custom control processes 12) Add/Delete/Modify any and all graphic displays, symbols, and cross- references to point data 13) Add/Delete/Modify dial-up telecommunication definition 14) Add/Delete/Modify all operator passwords 15) Add/Delete/Modify Alarm Messages b. Programming Description: Definition of operator device characteristics, DDC panels, individual points, applications and control sequences shall be performed through fill-in-the-blank templates and graphical programming approach. 1) Graphical programming shall allow the user to define the software configuration of DDC control logic for HVAC system control sequences, fan interlocks, pump interlocks, PID control loops, and other control relationships through the creation of graphical logic flow diagrams. 2) Graphical Programming: Control sequences are created by using a mouse input device to draw interconnecting lines between symbols depicting inputs, operators (comparisons and mathematical calculations), and outputs of a control sequence. As a minimum, graphic symbols shall be used to represent: 3) Process Inputs, such as temperature, humidity, or pressure values, status, time, date, or any other measured or calculated system data. 4) Mathematical Process Operators, such as addition, subtraction, multiplication, or greater than, equal to, less than, etc. 5) Logical Process Operators such as AND, OR, Exclusive OR, NOT, etc. 6) Time Delays 7) Process Control Outputs such start/stop control points, analog adjust points, etc. 8) Process Calculation Outputs 9) Text file Outputs and Advisories 10) Network-Wide Strategy Development: Inputs and outputs for any process shall not be restricted to a single DDC panel, but shall be able to include data from any and all other DDC panels to allow the development of network-wide control strategies. Processes shall also allow the operator to use the results of one process as the input to any number of other processes (cascading). 11) Sequence Testing and Simulation: A software tool shall be provided, which allows a user to simulate control sequence execution and test strategies before they are actually applied to mechanical systems. Users shall be able to enter hypothetical input data, and verify desired control response and calculation results via graphical displays and hardcopy printouts. c. System Definition/Control Sequence Documentation: All portions of system definition shall be self-documenting to provide hardcopy printouts of all configuration and application data. Control process and DDC control loop

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documentation shall be provided in logical, graphical flow diagram format to allow control sequences to be easily interpreted and modified at any time in the future. d. Database Save/Restore/Back-Up: Back-up copies of all standalone DDC panel databases shall be stored in at least one Operator Workstation. 1) Continuous supervision of the integrity of all DDC panel data bases shall be provided. In the event that any DDC panel on the network experiences a loss of its data base for any reason, the system shall automatically download a new copy of the respective data base to restore proper operation. Data base back-up/Download shall occur over the local area network without operator intervention. Users shall also have the ability to manually execute downloads of any or all portions of a DDC panels data base. e. Air Handlers 1) Supply fan status/selection. 2) Return fan status. 3) Discharge air setpoint/selection. 4) Mixed air temperature 5) Outdoor air temperature. 6) Smoke detector - normal/alarm 7) Freezestat - normal/alarm 8) Static pressure high limit - normal/alarm 9) Static pressure low limit - normal/alarm 10) Filter differential pressure - normal/alarm 11) Supply cfm. 12) Return cfm. 13) Space temperature sensor setpoint/selection 14) Warm up sensor setpoint/selection 15) Space relative humidity sensor setpoint/selection 16) Return air relative humidity sensor setpoint/selection. 17) High limit humidistat - normal/alarm. 18) Time based schedule start/stop time selection. f. Chilled Water System 1) Chillers status selection 2) Chilled water pumps status 3) Condenser water pumps status 4) Chilled common alarm - normal/alarm 5) Primary chilled water supply temperature setpoint/selection 6) Primary chilled water return temperature 7) Secondary chilled water supply temperature setpoint/selection 8) Secondary chilled water return temperature 9) Primary chilled water flow in gpm 10) Secondary chilled water flow in gpm 11) Time based schedule start/stop time selection. g. Hot Water System 1) Hot water supply temperature setpoint selection 2) Hot water return temperature 3) Outdoor temperature 4) Hot water pump status selection.

G. Integration with Third-party Manufacturer's Equipment

1. General

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a. The Facility Management System (FMS) shall be capable of interoperating with multiple building systems supplied by different manufacturers. The FMS shall be able to receive, react to, and in some cases, return information from multiple building systems. 1) Point inputs and outputs from the third-party controllers shall have real-time interoperability with FMS software features such as: Control Software, Energy Management, Custom Process Programming, Alarm Management, Historical Data and Trend Analysis, Totalization, and Dial-Up and Local Area Network Communications, as mentioned earlier in the specification. 2. Networking/Communications: a. The FMS shall support any combination of third-party controllers (if more than one third-party manufacturer is being integrated) on a single network. b. A minimum of 100 third-party controllers shall be supported on a single network. c. Integration shall be by RS-232 or RS-485 technologies. 3. Diagnostics/Verification: a. The installer/operator shall have the ability to verify, and diagnose communication messages and point information between third-party controllers and the Facility Management System. 4. Point Inputs and Outputs: a. The FMS shall be able to monitor and control the following third-party controller point inputs and outputs.

H. DDC System Architecture

1. The specified DDC system shall consist of an information sharing network of stand-alone direct digital control panels to monitor and control the specified mechanical equipment per the control sequence and input/output summary. Information sharing network shall be defined as the ability of each Direct Digital Control Field Panel (DDCFP) to exchange information on the network with other DDCFP without the need of a front end devices such as a central computer, gateways or any other network managing device. The stand- alone capability shall be defined as the ability of each DDC panel to independently monitor and control connected mechanical equipment through its own internal microprocessor. 2. The DDCFP network shall operate on a true token pass, peer to peer communication basis. The internal microprocessors which reside within each DDCFP shall provide for full exchange of system information between each DDCFP on the network communication trunk. Systems which rely on a central processor or similar device to exchange system information shall not be acceptable. Failure of any one of the network DDCFP panels shall not affect the operation of other DDC panels residing on the same network. All DDC panel/point failures shall be annunciated at specified printers or terminals. 3. It is recognized that some systems may use stand-alone terminal unit controllers on the network, between the DDCFP and the equipment to be controlled. Such controllers may control an individual VAV box, heat pump or fan coil. It is not the intent of this specification that terminal unit controllers communicate directly with each other without going through the DDCFP. 4. Network transmission shall occur at minimum rate of 9600 band. This includes transmission on data bus from DDCFP to DDCFP and from DDCFP to host computer. Full communications shall be sustained as long as there are at least two operational DDCFPS on any segment of the bus. All transmission shall incorporate data integrity and validity check routings by virtue of either Manchester encoding, double transmission

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or parity bit techniques. The DDC system shall clearly state the DDC submittal that data integrity and validity routines are incorporated in the system and the technique used and incorporated.

I. Direct Digital Control Field Panels (DDCFP)

1. General: Standalone DDC panels shall be microprocessor based, multi-tasking, multi- user, real-time digital control processors. Each standalone DDC panel shall consist of modular hardware with plug-in enclosed processors, communication controllers, power supplies, and input/output modules. A sufficient number of controllers shall be supplied to fully meet the requirements of this specification and the attached point list. 2. Memory: Each DDC panel shall have sufficient memory (minimum 4 megabytes) to support its own operating system and databases including: a. Control processes b. Energy Management Applications c. Alarm Management d. Historical/Trend Data for all points e. Maintenance Support Applications f. Custom Processes g. Operator I/0 h. Dial-Up Communications i. Manual Override Monitoring 3. Point types: Each DDC panel shall support the following types of point inputs and outputs: a. Digital Inputs for status/alarm contacts b. Digital Outputs for on/off equipment control c. Analog Inputs for temperature, pressure, humidity, flow, and position measurements d. Analog Outputs for valve and damper position control, and capacity control of primary equipment e. Pulse Inputs for pulsed contact monitoring 4. Expandability: The system shall be modular in nature, and shall permit easy expansion through the addition of software applications, workstation hardware, field controllers, sensors, and actuators. 5. Serial Communication Ports: Standalone DDC panels shall provide at least two RS-232C serial data communication ports for simultaneous operation of multiple operator I/0 devices such as industry standard printers, laptop workstations, PC workstations, and panel mounted or portable DDC panel Operator's Terminals. Standalone DDC panels shall allow temporary use of portable devices without interrupting the normal operation of permanently connected modems, printers, or network terminals. 6. Hardware Override Switches: As indicated in the point schedule, the operator shall have the ability to manually override automatic or centrally executed commands at the DDC panel via local, point discrete, onboard hand/off/auto operator override switches for binary control points and gradual switches for analog control type points. These override switches shall be operable whether the panel is powered or not. 7. Hardware Override Monitoring: DDC panels shall monitor the status or position of all overrides, and include this information in logs and summaries to inform the operator that automatic control has been inhibited. DDC panels shall also collect override activity information for daily and monthly reports.

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8. Local Status Indicator Lamps: The DDC panel shall provide local status indication for each binary input and output for constant, up-to-date verification of all point conditions without the need for an operator I/0 device. 9. Integrated On-Line Diagnostics: Each DDC panel shall continuously perform self- diagnostics, communication diagnosis and diagnosis of subsidiary equipment. The DDC panel shall provide both local and remote annunciation of any detected component failures, or repeated failure to establish communication. Indication of the diagnostic results shall be provided at each DDC panel, and shall not require the connection of an operator I/0 device. 10. 1Surge and Transient Protection: Isolation shall be provided at all network terminations, as well as all field point terminations to suppress induced voltage transients consistent with IEEE Standard 587. 11. 1Powerfail Restart: In the event of the loss of normal power, there shall be an orderly shutdown of all standalone DDC panels to prevent the loss of database or operating system software. Non-Volatile memory shall be incorporated for all critical controller configuration data, and battery back-up shall be provided to support the real-time clock and all volatile memory for a minimum of 72 hours. a. Upon restoration of normal power, the DDC panel shall automatically resume full operation without manual intervention. b. Should DDC panel memory be lost for any reason, the panel will automatically receive a download via the local area network, phone lines, or connected computer. In addition, the user shall have the capability of reloading the DDC panel via the local area network, via the local RS-232C port, or via telephone line dial-in.

J. System Software Features

1. General a. All necessary software to form a complete operating system as described in this specification shall be provided. b. The software programs specified in this section shall be provided as an integral part of the DDC panel and shall not be dependent upon any higher level computer for execution. 2. Control Software Description: a. Pre-Tested Control Algorithms: The DDC panels shall have the ability to perform the following pre-tested control algorithms: 1) Two Position Control 2) Proportional Control 3) Proportional plus Integral Control 4) Proportional, Integral, plus Derivative Control 5) Automatic Control Loop Tuning b. Equipment Cycling Protection: Control software shall include a provision for limiting the number of times each piece of equipment may be cycled within any one-hour period. c. Heavy Equipment Delays: The system shall provide protection against excessive demand situations during start-up periods by automatically introducing time delays between successive start commands to heavy electrical loads. d. Powerfail Motor Restart: Upon the resumption of normal power, the DDC panel shall analyze the status of all controlled equipment, compare it with normal occupancy scheduling, and turn equipment on or off as necessary to resume normal operation. 3. Energy Management Applications:

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a. DDC Panels shall have the ability to perform any or all of the following energy management routines: 1) Time of Day Scheduling 2) Calendar Based Scheduling 3) Holiday Scheduling 4) Temporary Schedule Overrides 5) Optimal Start 6) Optimal Stop 7) Night Setback Control 8) Enthalpy Switch Over (Economizer) 9) Peak Demand Limiting 10) Temperature Compensated Load Rolling 11) Fan Speed/CFM Control 12) Heating/Cooling Interlock 13) Cold Deck Reset 14) Hot Deck Reset 15) Hot Water Reset 16) Chilled Water Reset 17) Condenser Water Reset 18) Chiller Sequencing b. All programs shall be executed automatically without the need for operator intervention, and shall be flexible enough to allow operator customization. Programs shall be applied to building equipment as described in the Execution portion of this specification. 4. Custom Process Programming Capability: DDC panels shall be able to execute custom, job-specific processes defined by the operator, to automatically perform calculations and special control routines. a. Process inputs and Variables: It shall be possible to use any of the following in a custom process: 1) Any system-measured point data or status 2) Any calculated data 3) Any results from other processes 4) User-Defined Constants 5) Arithmetic functions square root, exponential, etc.) 6) Boolean logic operators (and, or, exclusive or, etc.) 7) On-delay/Off-delay/One-shot timers b. Process Triggers: Custom processes may be triggered based on any combination of the following: 1) Time interval 2) Time of day 3) Date 4) Other processes 5) Time programming 6) Events (e.g., point alarms) c. Dynamic Data Access: A single process shall be able to incorporate measured or calculated data from any and all other DDC panels on the local area network. 1) In addition, a single process shall be able to issue commands to points in any and all other DDC panels on the local area network. d. Advisory/Message Generation: Processes shall be able to generate operator messages and advisories to operator 1/0 devices. A process shall be able to directly send a message to a specified device, buffer the information in a follow-up

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file, or cause the execution of a dial-up connection to a remote device such as a printer. e. Custom Process Documentation: The custom control programming feature shall be self-documenting. All interrelationships defined by this feature shall be documented via graphical flowcharts and English language descriptors. 5. Alarm Management: Alarm management shall be provided to monitor, buffer, and direct alarm reports to operator devices and memory files. Each DDC panel shall perform distributed, independent alarm analysis and filtering to minimize operator interruptions due to non-critical alarms, minimize network traffic, and prevent alarms from being lost. At no time shall the DDC panel's ability to report alarms be affected by either operator activity at a PC Workstation or local I/0 device, or communications with other panels on the network. a. Point Change Report Description: All alarm or point change reports shall include the point's English language description, and the time and date of occurrence. b. Prioritization: The user shall be able to define the specific system reaction for each point. Alarms shall be prioritized to minimize nuisance reporting and to speed operator response to critical alarms. A minimum of three priority levels shall be provided. Each DDC panel shall automatically inhibit the reporting of selected alarms during system shutdown and start-up. Users shall have the ability to manually inhibit alarm reporting for each point. 1) The user shall also be able to define under which conditions point changes need to be acknowledged by an operator, and/or sent to follow-up files for retrieval and analysis at a later date. c. Report Routing: Alarm reports, messages, and files will be directed to a user- defined list of operator devices or PC disk files used for archiving alarm information. Alarms shall also be automatically directed to a default device in the event a primary device is found to be off-line. d. Alarm Messages: In addition to the point's descriptor and the time and date, the user shall be able to print, display or store a 65-character alarm-n message to more fully describe the alarm condition or direct operator response. 1) Each standalone DDC panel shall be capable of storing a library of at least 250 Alarm Messages. Each message may be assignable to any number of points in the panel. e. Auto-Dial Alarm Management: In Dial-up applications, only critical alarms shall initiate a call to a remote operator device. In all other cases, call activity shall be minimized by time-stamping and saving reports until an operator scheduled time, a manual request, or until the buffer space is full. The alarm buffer must store a minimum of 50 alarms. f. Transaction Logging: Operator commands and system events shall be automatically logged to disk in Personal Computer industry standard database format. Operator commands initiated from Direct connected workstations, dial-up workstations, and local DDC panel Network Terminal devices shall all be logged to this transaction file. This data shall be available at the Operator Workstation. A utility shall be provided to allow the user to search the transaction file using standard database query techniques, including searching by dates, operator name, data point name, etc. In addition, this transaction file shall be accessible with standard third party database and spreadsheet packages. 6. Historical Data and Trend Analysis: A variety of Historical data collection utilities shall be provided to automatically sample, store, and display system data in all of the following ways:

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a. Continuous Point Histories: Standalone DDC panels shall store Point History Files for all analog and binary inputs and outputs. 1) The Point History routine shall continuously and automatically sample the value of all analog inputs at half hour intervals. Samples for all points shall be stored for the past 24 hours to allow the user to immediately analyze equipment performance and all problem-related events for the past day. Point History Files for binary input or output points and analog output points shall include a continuous record of the last ten status changes or commands for each point. b. Control Loop Performance Trends: Standalone DDC panels shall also provide high resolution sampling capability in one-second increments for verification of control loop performance. c. Extended Sample Period Trends: Measured and calculated analog and binary data shall also be assignable to user-definable trends for the purpose of collecting operator-specified performance data over extended periods of time. Sample intervals of 1 minute to 2 hours shall be provided. Each standalone DDC panel shall have a dedicated buffer for trend data, and shall be capable of storing a minimum of 5000 data samples. d. Data Storage and Archiving: Trend data shall be stored at the Standalone DDC panels, and uploaded to hard disk storage when archival is desired. Uploads shall occur based upon either user-defined interval, manual command, or when the trend buffers become full. All trend data shall be available in disk file format compatible with Third Party personal computer applications. 7. Runtime Totalization: Standalone DDC panels shall automatically accumulate and store runtime hours for binary input and output points as specified in the Execution portion of this specification. a. The Totalization routine shall have a sampling resolution of one minute or less. b. The user shall have the ability to define a warning limit for Runtime Totalization. Unique, user-specified messages shall be generated when the limit is reached. 8. Analog/Pulse Totalization: Standalone DDC panels shall automatically sample, calculate and store consumption totals on a daily, weekly, or monthly basis for user-selected analog and binary pulse input-type points. a. Totalization shall provide calculation and storage of accumulations of up to 99,999.9 units (e.g. KWH, gallons, KBTU, tons. etc.). b. The Totalization routine shall have a sampling resolution of one minute or less. c. The user shall have the ability to define a warning limit. Unique, user-specified messages shall be generated when the limit is reached. 9. Event Totalization: Standalone DDC panels shall have the ability to count events such as the number of times a pump or fan system is cycled on and off. Event totalization shall be performed on a daily, weekly, or monthly basis. a. The Event Totalization feature shall be able to store the records associated with a minimum of 9,999,999 events before reset. b. The user shall have the ability to define a warning limit. Unique, user-specified messages shall be generated when the limit is reached. 10. Provide at least DDCFPs to serve the project (to serve the following systems.) 1) No. of DDCFPsSystem 11. Locate DDCFPs, slave panels (if provided), relay panels, pneumatic central panels and other temperature control system enclosures in the following areas only:

K. Portable Operator’s Terminals

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1. Each DDC panel shall be capable of supporting an operator's terminal for local command entry, instantaneous and historical data display, and program additions and modifications. Provide portable operator’s terminals. a. There shall be a provision for both permanently mounting the standalone DDC panel Operator Terminal, or using it as a portable hand-held unit. b. The DDC panel Operator Terminal shall simultaneously display a minimum of 6 points with full English identification to allow an operator to view single screen dynamic displays depicting entire mechanical systems. c. The operator functions provided by the DDC panel Operator Terminal shall include, but not be limited to, the following: 1) Start and Stop Points 2) Modify Setpoints 3) Modify PID Loop Setpoints 4) Override PID Control 5) Change Time/Date 6) Add/Modify Start/Stop Weekly Scheduling 7) Add/Modify Setpoint Weekly Scheduling 8) Enter Temporary Override Schedules 9) Define Holiday Schedules 10) View Analog Limits 11) Enter/Modify Analog Warning Limits 12) Enter/Modify Analog Alarm Limits 13) Enter/Modify Analog Differentials 14) View Point History Files d. The DDC panel Operator Terminal shall provide access to all real or calculated points in the controller to which it is connected, or any other controller in the network. This capability shall not b ' e restricted to a set of predefined "global points," but shall provide totally open exchange of data between the operator terminal and any DDC panel in the network. e. Operator access at all DDC panel Operator Terminals shall be identical to each other, as well as identical to the PC or Laptop Operator Workstations. Any password changes shall automatically be downloaded to all DDC controllers on the network. f. The DDC panel operator terminal shall provide English language prompting to eliminate the need for the user to remember command formats or point names. Prompting shall be provided consistent with a user's password clearance and the types of points being displayed, to eliminate the possibility of operator error. g. A multi-function touchpad shall be provided for point and command selection, as well as parameter entry. To minimize the possibility of operator error, the DDC panel Operator Terminal shall change and limit touchpad functions based upon an operator's password clearance, the function being performed, and types of points being displayed. Screen displays shall clearly indicate only valid touchpad functions. h. Context-Sensitive Help: On-line, interactive user's "Help" manuals and tutorials shall be provided. Based upon operator request, the "help" function shall provide general system operating instructions, and specific descriptions of commands available in the currently displayed menus. i. Identification for all real or calculated points shall be consistent for all network devices. The same English language names used at PC workstations shall be used to access points at the DDC panel Operator's Terminal to eliminate cross-reference or look-up tables.

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j. In addition to instantaneous summaries, the DDC panel Operator's Terminal shall allow a user to view a Point History file for system points. Point History files shall provide a record of value of analog points over the last 24 hours, at 30¬minute intervals, or a record of the last ten status changes for binary type points.

L. DDC Terminal Box Controllers

1. ATC contractor shall provide microprocessor based Terminal Unit Controllers for variable air volume terminal boxes. ATC contractor shall have responsibility for the provision of damper actuator, microprocessor based controller, control transformer, velocity pressure transducer, room sensors and all control wiring. a. ATC shall have responsibility for startup, checkout, calibration and replacement of all control system components. ATC shall have responsibility of mounting control components whether components are mounted in the field or at the box manufacturer's plant. b. ATC shall determine compatibility of pressure sensor output provided with terminal box with transducer and control software and provide appropriate and compatible components. c. Terminal Unit Control System shall perform sequences of control as described on the drawings. In general, the controller shall provide for cooling, warm up, night heating, tenant override. See sequences for specific requirements. d. Provide one (1) portable operator's terminal for balancers use during balancing, with unit being provided to DCAMM when balancing is done. Operator's terminal shall permit readout of system variables, override control and adjustment of control parameters. Operator's terminal shall be hand held, complete with keyboard and plug directly into wall mounted sensors for power and data. e. The controls contractor shall ensure that the control transformer which he provides is compatible with the electrical power feed to each terminal box, provided under Section 26001, ELECTRICAL WORK, and with the requirements of the fan and electric coil provided with terminal fan box (or provided under the work of the mechanical section if a duct mounted coil).

M. DDC Terminal Box Monitoring and Control Functions

1. From the central CRT and from a portable operators terminal, it shall be possible to provide the following control and monitoring functions for each DDC terminal box: a. Indicate system status (heating, cooling, out of control range). b. Display, set and manually override minimum and maximum air duct flow in cfm. Display actual cfm. c. Display space temperature. d. Display, set and manually override space temperature setpoint and deadband. e. Set and change heating/cooling deadband. f. Display damper and valve position in percent open notation. g. Command damper and valve position in percent open notation. h. Select application mode. i. Assign terminal control unit address. j. Display and manually override reheat. k. Set and change control loop gains. l. Change unoccupied/occupied mode.

N. DDC Sensors and Point Hardware

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1. General a. When providing instruments with 4-20 mA transmitters and conversation to voltage is required at DDCFP, controls contractor shall provide 250 ohm 1% precision resistor. 2. Alarms a. Alarm contacts shall be wired normally closed (NC). When in alarm condition or if wire to contact is opened (wire cut), DDCFP shall sense condition and generate alarm. b. Common alarms shall be wired relay coils in parallel with common alarm pilot light or to alarm terminals on manufacturer's control panel. Contacts shall input to DDCFP. Line printer shall indicate normal or alarm. c. Chiller alarm shall be taken from common alarm contacts in each chiller control panel wired in series back to DDCFP as one alarm point. d. Provide two binary inputs from each smoke control FOP (Firefighter's Override Panel) switch as specified under smoke control sequences. 1) Do not generate interlock sequences and printouts without Designer ’s approval. All control wiring between the FOP and DDC panel, motor starters, and controlled devices shall be performed under the work of this section. This includes wiring the indicator lights at the FOP. 3. DDC Sensors and Point Hardware a. Temperature Sensors and Transmitters 1) Temperature sensors shall conform to the following minimum standards. Additional specifications are given for specific applications below. a) (Sensors shall be accurate to +0.25°F over minimum operating ranges. b) (Sensor, associated circuitry and readout shall have minimum resolution of 0.25°F. c) (Sensors shall withstand ambient temperatures of -30°F to 240°F, but performance requirements must be met only for ranges specified. 2) Provide thermistor (1000 ohms or greater) or resistance temperature detector (RTD) sensors, for the following applications and minimum operating ranges. a) Wall Mount Space Sensor: 40° F to 100°F b) Duct Mount Sensor: 20°F to 120°F c) Chilled Water Sensor: 32°F to 80°F d) Condenser Water Sensor: 40°F to 100°F e) Hot Water Sensor: 32°F to 210°F 3) Provide thermistor (1000 ohms or greater) or resistance temperature detector (RTD) sensors, for outside air temperature measurement. Sensor shall be mounted in 24 hour shade location, in proximity to a light colored wall, in an aspirated enclosure insulated with foam from thermal transfer with adjacent structure. Sensor shall operate within the following minimum range: -20°F to 120°F. 4) Provide averaging resistance temperature detector (RTD) sensor only, for mixed air measurement. Sensor shall provide a minimum duct coverage of 1 foot per 2 feet of duct. Sensor shall not come in direct contact with water or steam coils. The sensor shall operate within the following range: 30°F to 120°F. 5) Provide wall mount sensor for range specified above. Where sensors are mounted in pivot office spaces they shall have a local setpoint adjustment.

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The SP range can be limited from DDCFP or front end computer. All other sensors shall have blank face plates. Sensors shall have features as listed: a) (Private offices b) (Setpoint adjustment c) (Thermometer d) (After hours occupancy switch (momentary) e) (Plug in jack for terminal communication. f) (Common areas g) (Setpoint adjustment h) (Thermometer i) (After hours occupancy switch (momentary) j) (Plug in jack for terminal communication. b. Flow Instruments 1) All flow sensors shall conform to the following minimum standards. a) (Sensor shall be accurate to a total of 3% over operating range. b) (Sensor shall be sized for 110% of maximum flow and shall not exceed manufacturer's flow rating. c) (Sensor, associated circuitry, and readout shall have a minimum range ability of 10:1 over assigned flow range. d) (Sensor and transmitter shall operate over a temperature range of 32°F to 210°F. e) (Maximum pressure drop across sensor shall be equivalent to 10 feet same size pipe (inlet or outlet pipe size). f) (Sensor shall be factory calibrated for the specific application according to the range, fluid density, and specific gravity. c. Humidity Sensors and Transmitters 1) Humidity accuracy shall be + 5% at full scale. Sensors shall contain integral single point calibration potentiometer. 2) Sensors shall be mounted so field calibration may be done without disrupting sensor operation. For duct mounted transmitters, coordinate access panel for field calibration/verification with sheetmetal. 3) Sensors shall be by Vaisala, General Eastern or Staefa. 4) Provide hand held field calibration tool compatible with calibration plug on humidity sensors. Calibration tool shall have the ability to read the humidity of our air stream, humidity of mounted sensors and differential between calibration tool and mounted sensor. 5) Sensors shall be manufactured by Vaisala. d. Pressure Sensors and Transmitters, General: 1) All pressure instruments shall conform to the following minimum standards. Additional specifications are given for specific applications below. a) Sensors shall be accurate to +1.0% of full scale (RSS method) and temperature effect shall contribute error less than +0.04% over the full scale of measurement. b) Sensors shall withstand up to 150% of rated pressure, but performance requirements must be met only for ranges specified. c) Sensor shall have separate zero and span adjustments for future field calibration. Adjustments shall be non-interactive. d) Sensors shall be manufactured and calibrated through system acceptance by Setra or Modus. 2) Provide sensors of the specific type for the following applications and operating ranges.

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System pressure gage pressure 125% system Duct static Differential 0-5" WC Building static Differential -0.25 to +0.25 wg System differ. Differential 125% max. supply/return rated pump head diffuser Filter Differential 0-2" WC

e. Pressure Sensors and Transmitters, Types: Provide isolation valve where required so sensor may be removed without draining system. 1) Flow Switches (Air): Provide differential static pressure switch with integral manual reset for low and high duct static pressure alarming. a) Field selectable setpoint (0.1" - 7" WC) adjustments and differential (0.1" - 0.5" WC). b) Switch shall withstand maximum differential pressure of 10" WC. 2) Flow Switches (Air): Static pressure switch for fan filter air flow status shall conform to requirements above. Static pressure shall be calibrated for accurate status indication at minimum VAV discharge to eliminate nuisance alarms. 3) Flow Switches (Water): Pump status shall be by differential pressure switch. a) Provide field selectable setpoint (10 psig-50 psig) and differential (2 psig) adjustments. b) Switch shall withstand maximum differential pressure of 150 psig. 4) Equipment Status a) Air flow status for constant volume systems shall be by differential pressure switch or current transducers. Only current transducers shall be used with VAV systems. If more than one fan, pump, or other piece of equipment is started from one start/stop, each shall have differential pressure switch or current transducers for status. b) Water flow status shall be sensed by differential pressure switch piped across pump. One piping connection shall be made at pump suction, the other at pump discharge before the discharge check valve. Protect or alarm equipment switch or system headers if switch is used to indicate system flow status. If switch senses system differential pressure switch shall indicate flow when at least one pump is running. 5) Electronic/Pneumatic Transducers a) Input signal shall be either 4-20 mA or 0-10 vdc with an output pressure of 0-20 psig. Sensors with input signals using the following methods are unacceptable, except with letter of request by the DCAMM Project Manager, Tri-state and pulse width modulation. b) Sensors shall be non-bleed type with no air consumption at steady state. c) Sensors shall be capable of field calibration. 6) Current Transducers/Sensors a) For equipment status, provide analog current sensing sensors. Sensors shall be capable of producing analog current value proportional to equipment current load. b) Sensors shall be accurate to +3% of full scale current. c) Sensors shall be capable of reading 125% of full load amps (FLA).

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7) Provide all control wiring between float switches, provided under Section 260001, ELECTRICAL WORK, in the emergency generators day tank, and the fuel oil pump set. 8) Provide for each humidifier on job a duct mounted air flow switch to interrupt humidification on lack of air flow; a duct mounted high limit humidistat set to shut down humidification if its 85% R.H. (adj.) setpoint is reached and a fully modulating duct mounted controlling humidistat. Provide all control wiring between components and ATC system. Coordinate with manufacturer at self contained electronic humidifiers to insure that output from ATC supplied humidistat is fully compatible with humidistat controls. f. DDC Software 1) Provide software required for efficient system operation as required by Contract Documents. Software shall be modular in design for flexibility in expansion and revision. 2) Software shall comprise computer vendor supplied and supported, real time disk operating system. Real time operating system executive shall control timing and sequencing of programs. Submit copies of software on disk to DCAMM and maintain backup copy. g. Electrical Wiring: Wiring and connections required for temperature control system shall be done under this Section, unless shown otherwise on Drawings, and shall comply with applicable requirements of Electrical Section. Necessary normal and emergency power wiring to control devices shall be done under this section. Electrical circuits for all controls shall be dedicated only to the control system. Wiring from and including the dedicated circuit breakers to the point of use shall be a part of this work of this section. h. Automatic Control Valves 1) Automatic control valves shall be fully proportioning with modulating plug of V port inner guides, unless otherwise specified. Fin-tube radiation valves shall be open/closed, 2 position type. Valves shall be quiet in operation and fail safe in either normally open or normally closed position as shown on control Drawings in event of control air failure. Valves shall operate in sequence when required. 2) Control valves shall be sized by equipment supplier and shall be guaranteed to meet heating and cooling loads specified. Control valves shall be suitable for same pressure conditions as specified for valves in PIPING Paragraph and shall close against differential involved. Valves shall be sized to operate accurately and with stability from 10% to 100% of maximum design flow. 3) Provide molded synthetic rubber diaphragm operators. Body pressure rating and connection (screwed or flanged) shall conform to Pipe Schedule specified in Air Piping Paragraph of this Section. 4) Valves sequenced with other valves or control devices and all chilled water valves 1" and over shall be equipped with pilot positioners. 5) Furnish to fan coil manufacturer, at his factory, (two way) (three way) automatic control valves. Coordinate with manufacturer as to types and sizes of connections to fan coil and required valve model numbers. i. Control Dampers 1) Automatic dampers shall be multiple opposed blade. 2) Provide one linkage connection point per eight square feet of section area, equally spaced. Sections shall not exceed 48" x 48". Provide shaft linkage

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(1/2" minimum bar with crankdown arms attached to blades) on dampers 12 ft. or wider. Dampers 12 ft. or wider and more than four feet high shall have one line shaft for each four feet of height, or any increment thereof; where size of damper requires more than one line shaft, spacing shall be equal. 3) Smoke dampers in AHUs shall be UL555S approved. 4) Damper frames shall be 13 gauge galvanized sheet metal with flanges for duct mounting. 5) Damper blades shall not exceed six" wide. Blades shall be fabricated from two sheets of corrugated 22 gauge galvanized sheet steel, spot welded. Blades shall be suitable for high velocity performance. 6) Damper bearings shall be nylon. Bushings that turn in bearings shall be oil impregnated, sintered metal. 7) Provide replaceable butyl rubber seals, along top, bottom and sides of frame and along each blade edge. Seals shall effect tight closing and low leakage. 48" x 48" damper section shall have leakage less than 7 cfm/sf at 4" WG differential pressure. Submit leakage and flow characteristic charts for approval. Dampers shall be Honeywell, Inc. #D643 Series, Johnson Controls, Inc. #D 1300 Series, Ruskin CD 50 or Vent Products 5900. j. Electronic Damper Actuator 1) Electronic direct coupled actuation shall be provided unless the damper shaft is not accessible in which case the appropriate linkage shall be provided. 2) The actuator shall be direct coupled over the shaft, enabling it to be mounted directly to the damper shaft without the need for connecting linkage. The fastening clamp assembly shall be of a “V” bolt design with associated “V” shaped toothed cradle attaching to the shaft for maximum strength and eliminating slippage. Spring return actuators shall have “V” clamp assembly of sufficient size to be directly mounted to an integral jack shaft of up to 1.05 inches when the damper is constructed in this manner. Single bolt or set screw type fasteners are not acceptable. 3) The actuator shall have electronic overload or digital rotation sensing circuitry to prevent damage to the actuator throughout the entire rotation of the actuator. Mechanical end switches or magnetic clutch to deactivate the actuator at the end of rotation are not acceptable. 4) For power failure/safety applications, an internal mechanical spring return mechanism shall be built into the actuator housing. Non-mechanical forms of fail safe operation are not acceptable. 5) All spring return actuators shall be capable of both clockwise or counterclockwise spring return operation by simply changing the mounting orientation. 6) Proportional actuators shall accept a 0 to 10 VDC or 0 to 20 mA control input and provide a 2 to 10 VDC or 4 to 20 mA operating range. An actuator capable of accepting a pulse width modulating control signal and providing full proportional operation of the damper is acceptable. All actuators shall provide a 2 to 10 VDC position feedback signal. 7) All 24 VAC/VDC actuators shall operate on Class 2 wiring and shall not require more than 10 VA for AC or more than 8 watts for DC applications. Actuators operating on a 120 VAC power shall not require more than 10 VA. Actuators operating on 230 VAC power shall not require more than 11 VA.

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8) All non-spring return actuators shall have an external manual gear release to allow manual positioning of the damper when the actuator is not powered. Spring return actuators with more than 60 in. lb. torque capacity shall have a manual crank for this purpose. 9) All modulating actuators shall have an external, built in switch to allow the reversing of direction of rotation. 10) Actuators shall be provided with a conduit fitting and a minimum three foot electrical cable and shall be pre-wired to eliminate the necessity of opening the actuator housing to make electrical connections. 11) Actuators shall be Underwriters Laboratories Standard 873 listed and Canadian Standards Association Class 4813 02 certified as meeting correct safety requirements and recognized industry standards. 12) Actuators shall be designed for a minimum of 60,000 full stroke cycles at the actuators rated torque and shall have a 2 year manufacturers warranty, starting from the date of installation. Manufacturer shall be ISO9001 certified. 13) Actuators shall be by Belimo. k. Smoke Detection and Dampers in Air Handling Units 1) Install duct smoke detectors furnished under Section 260001 – ELECTRICAL WORK where shown on Drawings. Wire to fan shutdown. Wiring to fire alarm system shall be part of work of Section 260001 – ELECTRICAL WORK. 2) Provide normally closed smoke dampers in return and supply air ducts to close automatically upon fan shutdown due to fire or smoke detection or upon manual shutdown. 3) Smoke dampers shall be controlled so that fans shall not start until dampers are open and fans shall stop before smoke dampers are fully closed. End switches, damper switches, and other components required shall be by temperature control manufacturer. l. Low Temperature Thermostat: Provide low temperature thermostats as shown on Drawings. Thermostat shall register alarm condition and shut down fan when temperature along any one foot of element length falls below setpoint. Do not provide averaging element. Provide one foot of element for every square foot of AHU coil face area. Wire to shut down fan as specified in control sequences. 1) Thermostats in public and multi occupancy areas shall have metal cover with tamperproof screws and satin chrome finish, with concealed adjustment, without thermometer. 2) Thermostats for private areas and single occupancy areas shall have open adjustment for use with key, exposed dial and accurate red reading thermometer. 3) Transmitters shall have closed adjustments. 4) Heating/cooling thermostats shall be dead band. m. Air Flow Measurement 1) Eliminator Series Engineers Guide Specification a) Manufacturer, Base Bid: Ebtron Inc., Series 3000, Series 4000 b) Air Flow and Temperature Measurement: Thermal anemometer using instrument grade self heated thermistor sensors with thermistor temperature sensors. Flow measurement drift shall not exceed Manufacturers repeatability statement for the life of the equipment. Manufacturer shall provide test data for accuracy performance prior to bid date. Vortex shedding arrays are not acceptable. Pitot tube and

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differential pressure sensing arrays are not acceptable. Auto zeroing sensors are not acceptable. 2) Ebtron Series 4000 Fan Inlet Sensor a) Flow Station Construction b) Type: Fan Inlet c) Sensors: Glass encapsulated self heated thermistor and epoxy encapsulated temperature sensor. d) Sensor Housing: Noryl e) Sensors per inlet: . <12,000 CFM, 2 sensor . >12,000 CFM, 4 sensors f) Support Struts: Tubular Steel, Adjustable to fit fan inlet g) Supporting Brackets: Steel h) Electronics . Type: Microprocessor based, totally solid state. . Connecting Cable Flow Sensor to Electronics: Plenum Rated, NEC Type CL2P . Enclosure: Aluminum, indoor use only. [option, insert: NEMA 4X, outdoor use] i) Performance . Flow station temperature range: 30 to 160 F . Flow station velocity range: 0 to 10,000 ft./min. . Flow station humidity range: 0 to 99% RH (¬non condensing) . Analog output signals, 0 5VDC, 0 10VDC, 4 20mA: . Sensor velocity linearity: + 10 ft./min. < 500 ft./min., + 2% reading >500 ft./min. . Sensor temperature accuracy: typ. 0.18 F, max. 0.36 F . Type: linear . Repeatability: + 0.2% scale . Resolution: 0.4% scale n. Ebtron Series 3000 Duct Mounted Sensor 1) Flow Station Construction 2) Type: Duct Mounted 3) Sensors : Glass encapsulated self heated thermistor and epoxy encapsulated temperature sensor. 4) Sensor Housing: Noryl [option for corrosive environments, insert: Kynar] 5) Sensors per probe: 1 to 4 6) Support Struts: Tubular Aluminum 6061 [option for corrosive environments, insert: 316 Stainless Steel] 7) Supporting Bracket: Aluminum 6063 [option for corrosive environments, insert 304 Stainless Steel] 8) Electronics a) Type: Microprocessor Based, totally solid state. b) Enclosure: Aluminum, indoor use only. [option, insert: NEMA 4X, outdoor use][option for corrosive environments, insert: 304 Stainless Steel] 9) Performance a) Electronics temperature range: 30 to 160 F b) Flow station temperature range: 30 to 160 F c) Flow station velocity range: 0 to 5,000 ft./min. d) Flow station pressure drop: less than 0.005 inwc @ 2000 ft./min

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e) Flow station humidity range: 0 to 99% RH (non condensing) f) Analog output signals: 0 5VDC, 0 10VDC, 4 20mA: . Sensor velocity accuracy: + 10 ft./min < 500 ft./min, + 2% reading >500 ft./min . Sensor temperature accuracy: typ. 0.18 F, max. 0.36 F g) Type: linear h) Repeatability: + 0.2% scale i) Resolution: 0.4% scale 10) Flow Conditioners a) Provide Hexagon cell flow straightener as determined by airflow measuring station manufacturer when required to meet installation guidelines. b) Construction: aluminum frame. 2.75” thick, 0.75” cell, aluminum foil core. 11) Performance: a) Pressure drop: <0.06 inwc at 2000 ft/min. o. CO2 Monitoring Equipment 1) Provide a CO2 monitoring/control system to control the outdoor air quantity ((______)), as indicated. 2) Detection system shall include but not be limited to the following components. a) Detection cell based on a non-dispersive infrared method which is not affected by humidity, dust, or other gases. b) A microprocessor based control module. c) Detection range: 0 - 2000 PPM. d) Single pole double throw relay with adjustable set point, factory preset at 850 PPM. e) Hysterisis stop set at 100 PPM. f) Two outputs: 0 - 10V and 4-20 mA (linear). g) LCD display. 3) Provide enclosure with sampling tubes for installation in return air duct serving ((______)), as indicated. 4) Provide remote mounting LCD panel, sampling tubing, mounting hardware, etc. as required for a complete and operable system. 5) Alarm indicator on remote panel shall indicate high CO2 with both an audible and visual alarm. Alarm condition shall remain on until CO2 levels drop below the pre-set levels, and/or until manually re-set at the LCD display panel. 6) CO2 detection system shall be as manufactured by Vulcain, Brasch, Johnson Controls or approved equal. p. Point List: Submit complete point list of devices or elements to be controlled or sensed by DDC system. Include sufficient detail to enable Designer to determine that DDC system can perform control sequence of operations listed on HVAC Drawings. Point count must contain at least: 1) List of every component to be sensed or controlled, keyed to terminology used in HVAC Control Drawings; that is, Valve V 1, AHU 1, etc. 2) List of hardware associated with each point; that is, solenoids, contactors, transducers, etc. 3) List of analog inputs to be sensed at each point; that is, temperature, relative humidity, etc. 4) Alarms associated with each point.

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5) Control functions associated with each point; that is, start/stop, setpoint control, etc.

2.105 SEQUENCE OF OPERATION

A. Boilers: On a call for heat, the controller will start the lead hot water pump, open the combustion air damper, and stage boilers to maintain supply hot water setpoint (user adjustable). On detection of pump failure, as sensed by current sensors, an alarm will be generated, and the lag pump will be started.

B. Rooftop Air Handling Units: the controller will start and stop units based on a time of day schedule. On a call to start a unit, the outdoor air damper will open 100%, and heating and cooling will be staged to maintain space temperature setpoint as sensed by space thermostat (user adjustable). If a unit fails to start, as sensed by a current sensor, an alarm will be generated. On detection of smoke in the supply duct, alarm will be generated. On detection of smoke in the supply duct, unit will be shut down by hardwired interlock. Filter differential pressure and smoke detector are monitored, and respective alarms will be generated on detection of excessive filter differential pressure or smoke detection.

C. Make-up Air Handling Units: the controller will start and stop units based on a time of day schedule. On a call to start a unit, the outdoor air damper will open 100%, and the three way heating coil control valve will modulate to maintain space temperature setpoint as sensed by space thermostat (user adjustable). If a unit fails to start, as sensed by a current sensor, an alarm will be generated. On detection of smoke in the supply duct, alarm will be generated. On detection of smoke in the supply duct, unit will be shut down by hardwired interlock. Filter differential pressure and smoke detector are monitored, and respective alarms will be generated on detection of excessive filter differential pressure or smoke detection.

D. Central Station Air Handling Units: the controller will start and stop units based on a time of day schedule. On a call to start a unit, the outdoor air damper will open 100%, and the three way heating coil control valve will modulate to maintain space temperature setpoint as sensed by space thermostat (user adjustable). Unit shall utilize economizer control to provide with outside air at ambient temperatures of 60 degrees F. and above. If a unit fails to start, as sensed by a current sensor, an alarm will be generated. On detection of smoke in the supply duct, alarm will be generated. On detection of smoke in the supply duct, unit will be shut down by hardwired interlock. Filter differential pressure and smoke detector are monitored, and respective alarms will be generated on detection of excessive filter differential pressure or smoke detection.

E. Miscellaneous Exhaust Fans: Exhaust fans are started and stopped based on a time of day schedule. On a call to start, respective dampers (where applicable) will open and fan will be energized. If unit fails to start, as sensed by current sensor, an alarm will be generated.

F. Electric Unit Heaters: A local thermostat will cycle the fan and energize heating coil to maintain space temperature setpoint.

G. Combustion Air: On a call for heat from the domestic hot water heater and/or heating boiler, the controller will open the combustion air damper.

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H. Hot Water Unit Heaters: A local thermostat will open the heating coil control valve and cycle the fan to maintain space temperature setpoint.

I. Air Cooled Chillers (Future): The chilled water system shall be started and stopped via the building management system. On a call for cooling, the chiller control system, provided by the chiller manufacturer, shall be initiated and circulating pumps shall be energized. The chiller control system shall start the lead chiller, and stage the compressors to maintain 45 degree leaving water temperature. When the lead chiller reaches 60% of it’s total capacity the second chiller shall be started and each chiller will share the load equally via the chiller control system. If the outside air temperature drops below 60 degrees (adjustable) and only one chiller is running at 20% load or less the chilled water system shall be commanded off via the BMS.

J. Fan Coil Unit (Hot/Chilled Water): The fan coil units are started and stopped based on a time of day schedule. A wall mounted thermostat maintains constant space temperature by modulating either two way control heating valve or two way cooling control valve.

K. Finned Tube Radiation: A wall mounted thermostat maintains constant space temperature by opening/closing the two way heating control valve. Isolation control valves, on both the supply and return, are commanded closed during the cooling season by the BMS to isolate the finned tube and prevent condensation.

L. Hot Water Unit Heaters and Cabinet Heaters: A wall mounted thermostat maintains constant space temperature by cycling the unit mounted fan. Isolation control valves, on both the supply and return, are commanded closed during the cooling season by the BMS to isolate the finned tube and prevent condensation.

M. Fan Coil Unit (Hot Water/DX Cooling): The fan coil units are started and stopped based on time of day schedule. A wall mounted thermostat maintains constant space temperature by modulating a heating coil two way valve or starting air cooled condensing unit and refrigeration cycle.

2.106 ACCESS DOORS

A. Provide proper access to materials and equipment that require inspection, replacement, repair or service and coordinate their delivery with the installing Trade. If proper access cannot be provided, confer with Designer as to best method of approach for minimizing effect of reduced access which may result.

B. Coordinate and prepare a location, size, and function schedule of access panels required to fully service equipment and deliver to a representative of the installing Trade. Furnish and install distinctively colored buttons (color as selected by Designer) in finished ceiling to identify all access panels.

C. Furnish access panels for installation under other Sections where fire dampers, volume dampers, controls, shut off valves, control valves, check valves, or other items installed under this Section require access and are concealed in floor, wall, furred space or above ceiling.

D. Ceilings consisting of lay in or removable splined tiles do not require access panels and dampers, splitters, or test hole openings above ceiling shall have location marked with thumb tack on finished ceiling panel. Location shall be noted on record drawings.

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E. Furnish access doors and frames for walls and ceilings to applicable trades for installation. Size as required for access and maintenance, minimum 16 by 16 inches.

F. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

1. J. L. Industries, Inc, Inc. 2. Karp Associates, Inc. 3. Larsen's Manufacturing Company. 4. Milcor Inc. 5. Nystrom, Inc.

G. Flush Access Doors and Trimless Frames: Fabricated from steel sheet.

1. Locations: Wall and ceiling surfaces as applicable. 2. Door: Minimum 0.060-inch-thick sheet metal, set flush with surrounding finish surfaces. 3. Frame: Minimum 0.060-inch-thick sheet metal with suitable bead flange. 4. Hinges: Continuous piano. 5. Lock: Cylinder, keyed alike.

H. Fire-Rated, Insulated, Flush Access Doors and Trimless Frames: Fabricated from steel sheet.

1. Locations: Wall and ceiling surfaces as applicable. 2. Fire-Resistance Rating: Not less than that of adjacent construction. 3. Temperature Rise Rating: 250 deg F at the end of 30 minutes. 4. Door: Flush panel with a core of mineral-fiber insulation enclosed in sheet metal with a minimum thickness of 0.036 inch. 5. Frame: Minimum 0.060-inch thick sheet metal with suitable bead flange. 6. Hinges: Continuous piano. 7. Automatic Closer: Spring type. 8. Lock: Self-latching device with cylinder lock, keyed alike.

PART 3 - EXECUTION

3.1 COMMISSIONING OF EQUIPMENT AND SYSTEMS

A. The Designer will check the completed installation either sequentially as different parts are completed, or when the entire installation is complete, at the sole option of the Designer.

B. Prior to the Designer’s checking a part of the installation or the entire installation, this contractor shall submit a letter signed by an officer of this contracting company or an officer of the Construction Manager stating that:

1. he is a an officer of the company, 2. he has personally inspected the installation to be checked, 3. the date of his inspection, 4. the installation is complete and tested and ready to be inspected by the Designer, and that all required test reports have been submitted.

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C. This contractor shall arrange that an officer of this contracting company or of the Construction Manager, as well as DCAMM’s Project Manager, in addition to other test witnesses that may be specified, shall witness the below listed tests. At the conclusion of each such test this contractor shall submit a letter signed by the officer stating that:

1. he is an officer of the company, 2. he has personally witnessed the test (give the name of the test), 3. the date of testing, 4. the results of testing, as compared to specified performance, 5. listing the name, title, and company affiliation of all those witnessing the test.

D. Tests Requiring Letters:

Sprinkler: Fire pump Electrical: Emergency generator Fire alarm Emergency Lighting and Power Distribution Fire Department Control Center HVAC: Smoke control Chiller operation and controls Cooling tower operation and controls Boiler operation and controls Air handler operation and controls

3.2 SPECIAL RESPONSIBILITIES

A. Coordination: Cooperate and coordinate with work of other Sections in executing work of this Section.

1. Perform work such that progress of entire project including work of other Sections shall not be interfered with or delayed. 2. Provide information as requested on items furnished under this Section which shall be installed under other Sections. 3. Obtain detailed installation information from manufacturers of equipment provided under this Section. 4. Obtain final roughing dimensions or other information as needed for complete installation of items furnished under other Sections. 5. Keep fully informed as to shape, size and position of openings required for material or equipment to be provided under this and other Sections. Give full information so that openings required by work of this Section may be coordinated with other work and other openings and may be provided for in advance. In case of failure to provide sufficient information in proper time, provide cutting and patching or have same done, at own expense and to full satisfaction of Designer. 6. Provide information as requested as to sizes, number and locations of concrete housekeeping pads necessary for floor mounted vibrating and rotating equipment provided under this Section. 7. Notify Designer of location and extent of existing piping, ductwork and equipment that interferes with new construction. In coordination with and with approval of Designer, relocate piping, ductwork and equipment to permit new work to be provided as required

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by Contract Documents. Remove non functioning and abandoned piping, ductwork and equipment as directed by Designer. Dispose of or store items as requested by Designer.

B. Installation Only Items

1. Where this contractor is required to install items which it does not purchase, it shall coordinate their delivery and be responsible for their unloading from delivery vehicles and for their safe handling and field storage up to the time of installation. This trade shall be responsible for: a. Any necessary field assembly and internal connections, as well as mounting in place of the items, including the purchase and installation of all dunnage supporting members and fastenings necessary to adapt them to architectural and structural conditions. b. Their connection to building systems including the purchase and installation of all terminating fittings necessary to adapt and connect them to the building systems. 2. This contractor shall carefully examine such items upon delivery. Claims that any of these items have been received in such condition that their installation will require procedures beyond the reasonable scope of work of this contractor will be considered only if presented in writing within one week of their date of delivery. Unless such claims have been submitted this contractor shall be fully responsible for the complete reconditioning or replacement of the damaged items.

C. Maintenance of equipment and systems: Maintain HVAC equipment and systems until Final Acceptance. Ensure adequate protection of equipment and material during delivery, storage, installation and shutdown and during delays pending final test of systems and equipment because of seasonal conditions. Do not use boilers before providing water treatment where required; this includes use of boilers for temporary heat or for testing.

D. Use of premises: Use of premises shall be restricted as directed by Designer and as required below.

1. Remove and dispose of dirt and debris, and keep premises reasonably clean. Upon completion of work, remove equipment and unused material. Put building and premises in neat and clean condition, and do cleaning and washing required to provide acceptable appearance and operation of equipment, to satisfaction of Designer and as specified under CLEANING paragraph. 2. It shall be this trade's responsibility to store his materials in a manner that will maintain an orderly clean appearance. If stored on site in open or unprotected areas, all equipment and material shall be kept off the ground by means of pallets or racks, and covered with tarpaulins. 3. Do not interfere with function of existing sewers and water and gas mains. Extreme care shall be observed to prevent debris from entering ductwork. Confer with Designer as to disruption of heating services or other utilities due to testing or connection of new work to existing. Interruption of heating services shall be performed at time of day or night deemed by Designer to provide minimal interference with normal operation. Obtain Designer ’s approval of the method proposed for minimizing service interruption.

E. Surveys and measurements:

1. Base measurements, both horizontal and vertical, on reference points established by Contractor and be responsible for correct laying out of work.

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2. In event of discrepancy between actual measurements and those indicated, notify Designer in writing and do not proceed with work until written instructions have been issued by Designer.

F. :

1. Clips, hangers, clamps, supports and other attachments to surfaces to be fireproofed shall be installed, insofar as possible, prior to start of spray fiber work. 2. Ducts, piping and other items which would interfere with proper application of fireproofing shall be installed after completion of spray fiber work. 3. Patching and repairing of spray fireproofing due to cutting or damaging to fireproofing during course of work specified under this Section shall be performed by installer of fireproofing and paid for by trade responsible for damage and shall not constitute grounds for an extra to DCAMM.

G. Temporary Heat:

1. Special reference is made to Section 015000, TEMPORARY FACILITIES AND CONTROLS. 2. Coordinate work under this Section with progress of construction so that permanent heating system will be ready to provide temporary heating if permitted by Designer as soon as building is closed in. 3. Provide and direct labor required for attendance, operation and final restoration of permanent heating system if used for temporary heating purposes. Continuous direct attendance shall be provided whenever permanent system is in operation prior to acceptance of permanent heating system by DCAMM’s Project Manager.

H. Gypsum Drywall Enclosures:

1. Coordinate and supervise construction of drywall and related work affecting work of this Section. 2. Work shall include but not be limited to following: a. Supply and return air duct enclosures on rooftop air handling units. b. Supply air plenums located above labs and computer rooms. c. Return air shafts. 3. Ensure tightness of plenums and chases used as part of air distribution system. System will not be accepted until proved tight, without leakage. Notify Designer in writing after system test for leakage, if construction and finish of plenums and ducts are not satisfactory.

I. Airbound Coils

1. If, after plant is in operation, any coils or other apparatus are stratified or air bound (by vacuum or pressure), they shall be repiped with new approved and necessary fittings, air vents, or vacuum breakers at no extra cost. If connections are concealed in furring, floors, or ceilings, this trade shall bear all expenses of tearing up and refinishing construction and finish, leaving same in as good condition as before it was disturbed.

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3.3 MATERIALS AND WORKMANSHIP

A. Work shall be neat and rectilinear. Ductwork and piping shall run concealed except in mechanical rooms and areas where no hung ceiling exists. Install material and equipment as required by manufacturers. Installation shall operate safely and without leakage, undue wear, noise, vibration, corrosion or water hammer. Work shall be properly and effectively protected, and pipe and duct openings shall be temporarily closed to prevent obstruction and damage before completion.

B. Except as specified otherwise, material and equipment shall be new. Provide supplies, appliances and connections necessary for complete and operational installation. Provide components required or recommended by OSHA and applicable NFPA documents.

C. References to manufacturers and to catalog designation, are intended to establish standards of quality for materials and performance but imply no further limitation of competitive bidding.

D. Finish of materials, components and equipment shall be as approved by Designer and shall be resistant to corrosion and weather as necessary.

E. DCAMM will not be responsible for material and equipment before testing and acceptance.

3.4 CONTINUITY OF SERVICES

A. Do not interrupt existing services without the DCAMM Project Manager’s approval.

B. Schedule interruptions in advance, according to the DCAMM Project Manager’s instructions. Submit, in writing, with request for interruption, methods proposed to minimize length of interruption.

C. Interruptions shall be scheduled at such times of day and work so that they have minimal impact on the User Agency’s operations.

3.5 TAGS

A. Upon completion of work, attach engraved laminated tags to all valves (listed in the valve directory called for in the "Bulletins, Manuals and Instructions" paragraph of these specifications) and all pieces of HVAC equipment (including but not limited to pumps, fans, air handlers, coils and all other equipment listed in the HVAC schedules). Valve tags shall have black characters on white face, consecutively numbered and prefixed by letter "V". Equipment tags shall have black characters on white face, with labels corresponding to drawing schedule numbers.

B. Embossed or engraved aluminum or brass tags may be substituted if desired. Tags shall be at least 1/8" thick.

C. Valve tags shall be at least 1" in diameter with numerals at least 3/8" high and attached by "S" hooks or chains. Equipment tags shall be at least 2" diameter securely attached to apparatus.

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D. Provide manufacturers equipment nameplates, catalog numbers and rating identification securely attached to electrical and mechanical equipment with screws or rivets. Adhesives or cements will not be permitted.

3.6 PIPE AND DUCT IDENTIFICATION

A. Ductwork shall be stenciled at each junction or branch takeoff, at least once in each room, and at intervals not longer than 20 ft. Stencil shall clearly identify duct service (S for supply, R for return, X for exhaust), area served by branch, and arrow indicating direction of flow.

B. Provide color coded pipe identification markers on piping installed under this Section. Pipe markers shall be snap on laminated plastic protected by clear acrylic coating. Pipe markers shall be applied after architectural painting where such is required.

C. Provide arrow marker with each pipe content marker to indicate direction of flow. If flow can be in either direction, use double headed arrow marker.

D. Mains shall be labeled at points of entrance and exit from mechanical room, adjacent to each valve, on each riser, at each tee fitting, at points of entrance and exit from building, at least once in each room, and at intervals no longer than 20 ft.

E. Size of legend letters on markers and length of color field shall be per the latest edition of ANSI A13.1.

F. Markers shall be "Setmark" by Seton Name Plate Corp. or approved equal.

G. Following color coding shall be used with names in black letters on background and white letters on green background.

Service Legend Background Color Chilled water supply CHWS Green Chilled water return CHWR Green Condenser water supply CWS Green Condenser water return CWR Green Hot water supply HWS Yellow Hot water return HWR Yellow Fuel oil supply FOS Yellow Fuel oil returns FOR Yellow Boiler Feed BFW Yellow Brine Brine Green Chilled/Hot water C/HWS Green Cold water CW Green Condensate Condensate Yellow High pressure steam HPS Yellow Low pressure steam LPS Yellow Medium pressure steam MPS Yellow Glycol supply GS Yellow Glycol return GR Yellow

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H. Color banding shall meet latest edition of ANSI A13.1 and OSHA.

3.7 WELDING

A. Weld only by approved acetylene or electric welding processes and welders shall hold certificate from approved insurance company.

B. Conduct test to demonstrate suitability of procedures to be used in making welds which conform to specified requirements.

C. Specification for welding procedure shall meet requirements of Welding Qualifications, Section IX, ASME Boiler and Pressure Vessel Code and ANSI B31.1.

D. Align components. No strain shall be placed on weld during welding. No part of pipe shall be offset more than 20% of thickness. Set flanges and branches properly.

E. Welder Qualification:

1. Test welders to demonstrate ability to make acceptable welds. Tests conducted for qualification of welder for work under one Division or Section shall not qualify welder for work under another Division or Section. 2. Tests shall be as prescribed for welder qualification in Section IX of the ASME code. 3. Records of such tests shall be as follows: Each welder shall be assigned an identifying number, letter or symbol. Identifying mark shall be stamped adjacent to welds made by this welder. Identification shall be at top of horizontal piping and at front of vertical piping. 4. Maintain record of welders employed, showing dates and results of tests and identifying mark assigned to each welder. Certify records and make them accessible to the DCAMM Project Manager. Before completion of project, one copy of records shall be turned over to DCAMM. 5. No qualification shall be older than three years when welder commences work on this project. If welder has not welded in required welding process for a period of six months, he shall be re certified.

F. Welding Tests

1. As designated by Designer, remove welds for destructive testing or for testing by non destructive means. Tests shall be as determined by Designer. 2. If, in Designer ’s opinion, welds so tested do not meet requirements of Sections VIII and IX of ASME, remove welds welded by that welder, at no cost to DCAMM. Rewelding shall be performed by qualified welder other than welder whose welds did not pass test. Welders whose welds were defective shall not be employed on site for remainder of project. 3. Welding of stanchions, brackets, anchors and other welding not performed on pipe joints shall be in accordance with requirements of AWS specifications and requirements.

3.8 PENETRATIONS AND SLEEVES

A. General

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1. Provide pipe and duct sleeves and packing materials as specified and as shown on Drawings at penetrations of foundations, walls, slabs (except on grade), partitions and floors. Sleeves shall meet NFPA 101 requirements and materials requirements of Part 2 of this Section. 2. Coordinate work carefully with architectural and structural work. Set sleeves in forms before concrete is poured. Provide core drilling as necessary if walls are poured, or otherwise constructed, without sleeves and a wall penetration is required. Provide core drilling as required for penetrations of existing construction. Do not penetrate structural members without Designer ’s approval. 3. Sleeves for insulated pipe and duct in non fire rated construction shall accommodate continuous insulation without compression. Sleeves and/or penetrations in fire rated construction shall be packed with fire rated material which shall maintain the fire rating of the wall. Seal ends of penetrations to provide continuous vapor barrier where insulation is interrupted. See Part Two of these specifications for requirements for packing materials. 4. Sleeves through floors shall be water tight and shall extend 2" above floor surface.

B. Pipe Sleeves

1. Annular space between pipe and sleeve shall be at least 1/4". 2. Sleeves are not required for slabs on grade unless specified otherwise. 3. Sleeves and packing materials, through rated fire walls and smoke partitions shall maintain fire rating of construction penetrated. 4. Do not support piping risers on sleeves.

C. Duct Sleeves and Prepared Openings

1. Provide duct sleeves for round ducts 15" and smaller; provide prepared, framed openings for round ducts larger than 15" and for square, rectangular and flat oval ducts, except as specified otherwise. Sleeves shall meet SMACNA requirements. 2. Provide sleeves for ducts through 1 , 2 or 3 hour fire rated construction and smoke partitions, regardless of size and shape of ducts. Sleeves shall maintain fire rating of construction penetrated. Sleeve and seal materials, construction and clearances shall meet requirements of SMACNA Fire Damper and Heat Stop Guide for Air Handling Systems. 3. Prepared openings shall be framed to provide 1" clearance between framing and duct or duct insulation.

D. Installation Testing, Listings and Approvals

1. Installation shall meet material manufacturer's recommendations exactly, particularly as regards safety, ventilation, removal of foreign materials and other details of installation. Dam openings as recommended. Remove flammable materials used for damming and forming seals in fire rated construction. 2. Sleeve penetration methods shall be water and gas tight and shall meet requirements of ASTM E 119 Standard Methods of Fire Tests of Building Construction and Materials. 3. Fire stop penetration seal methods and materials shall be FM approved and UL listed as applicable. 4. Inspect foamed sealants to ensure manufacturer's optimum cell structure and color ranges.

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3.9 ANCHORS AND INSERTS

A. Inserts shall be iron or steel of type to receive machine bolt head or nut after installation. Inserts shall permit adjustment of bolt in one horizontal direction and shall develop strength of bolt when installed in properly cured concrete.

B. Provide anchors as necessary for attachment of equipment supports and hangars.

3.10 INSTALLATION OF EQUIPMENT

A. Avoid interference with structure and with work of other trades, preserving adequate headroom and clearing doors and passageways, to satisfaction of Designer and in accordance with code requirements. Installation shall permit clearance for access to equipment for repair, servicing and replacement.

B. Install equipment so as to properly distribute equipment loads on building structural members provided for equipment support under other Sections. Roof mounted equipment shall be installed and supported on structural steel provided under other Sections.

C. Provide suspended platforms, strap hangers, brackets, shelves, stands or legs as necessary for floor, wall or ceiling mounting of equipment provided under this Section (e.g. heating and ventilating units, fans, ducts and piping) as indicated on Drawings and in Specifications.

D. Provide steel supports and hardware for proper installation of hangers, anchors, guides, etc.

E. Provide cuts, weights, and other pertinent data required for proper coordination of equipment support provisions and installation.

F. Structural steel and hardware shall conform to Standard Specifications of ASTM; use of steel and hardware shall conform to requirements of Section Five of Code of Practice of American Institute of Steel Construction.

G. Verify site conditions and dimensions of equipment to ensure access for proper installation of equipment without disassembly which will void warrantee. Report in writing to Designer, prior to purchase or shipment of equipment involved, on conditions which may prevent proper installation.

3.11 CHILLER INSTALLATION

A. Install chiller on flat surface level within 1/8 in. and of sufficient strength to support concentrated loading. Place isolation pad assemblies furnished by manufacturer under unit. Use spring type isolators for upper floor installation.

B. Assemble and install components furnished according to manufacturer's literature.

C. Connect water piping so centrifugal unit and water circuits are serviceable.

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D. Provide valves in water piping upstream and downstream of evaporator and condenser water boxes to provide means of isolating shells for maintenance and to balance and trim system as specified.

E. Install flow switch in both chilled water and condenser water piping, properly interlocked to ensure that unit can operate only when flow is established.

F. Provide taps for thermometers and pressure gauges in water piping adjacent to inlet and outlet connections of both evaporator and condenser.

G. Provide drain valves to each water box.

H. Install vent cocks to each water box.

I. Install strainers ahead of pumps and automatic modulating valves.

J. Provide necessary auxiliary water piping for oil cooler, purge condenser and pumpout.

K. Provide pressure relief piping from chillers relief device, to atmosphere, at the exterior of the building. Discharge location must be pre approved by Designer before installation. Provide one relief line, to atmosphere, for each chiller; relief piping line size must be equal or greater than size of relief valve outlet. All aspects of relief piping installation shall be in accordance with the latest edition of the ASHRAE (ANSI 15 Safety Code).

L. Furnish sufficient refrigerant charge and dry nitrogen for pressure testing under manufacturer's supervision.

M. Start up unit under supervision of qualified field engineer provided by chiller manufacturer.

N. Insulate evaporator and other portions of machine which have not been insulated at factory, as required to prevent sweating under normal operating conditions.

3.12 BOILER ERECTION AND CLEANING HOT WATER

A. Install boiler in accordance with manufacturer's instructions. Provide for expansion and contraction of hot water mains connected to boiler with anchors at suitable points and swing joints. Feedwater, make up water and water treatment shall be introduced into boiler through return piping.

B. Clean internally as specified in Section VI of ASME Boiler Pressure Vessel Code. Use boil out compound of caustic soda or trisodium phosphate at one pound 50 gallons of water as follows:

1. Remove pressure relief valve. Pour solution into boiler through tapping and replace relief valve. 2. Start burner and circulate water throughout system and terminal heaters. 3. Allow water temperature to reach operating temperature, at least 180°F and vent system. 4. Circulate water for five hours or as directed by Designer. 5. Stop burner and drain system. 6. Remove pressure relief valve, wash boiler water side surfaces with high pressure water and drain residue. Replace pressure relief valve at completion.

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7. Refill system with fresh water and start burner. Bring water temperature to at least 180°F and vent system to eliminate entrained air. 8. Place boiler in service or on standby as required by Designer. 9. Repeat cleanout as directed by Designer and until no contaminants remain in system.

3.13 BURNER LIGHTOFF, ADJUSTMENT AND PRESSURE TEST

A. Provide services of factory trained burner service technician to perform light off, adjustment and control checkout in presence of Gas Inspector and gas company representative. Instruct User Agency’s personnel in boiler/burner operation.

B. Burner light off and adjustment shall include combustion efficiency tests using batch or electronic analyzing apparatus, in presence of Designer.

C. Test data shall include:

1. Burner input and proper rate. 2. Control operating tests including adjustment and check out of limits, switches, operating controls, interlocks, low water cutoff devices and alarms, gas valves, pressure regulators, scanners and combustion controls. 3. Purging boiler and pilot operation tests; tests for venting. 4. Percent CO2 in flue gas. 5. Gross and net stack temperatures. Presence of CO (if any) and adjustment to reduce as necessary. 6. Steady state combustion efficiency; burner adjustments to provide optimum efficiency. Setting and adjustment of pressure overfire at slide damper, to manufacturer's specifications.

D. Pressure Tests

1. Subject pressure parts to hydrostatic test of 125 psi at factory. Field tests shall be limited to no more than maximum intended working pressure. 2. Furnish equipment, piping, labor, staging, fittings, valves, hoses and other material required to perform hydrostatic tests as directed. 3. Perform hydrostatic test of at least 40 psig for 5 hours. Tests shall be of duration necessary to satisfy Designer and Boiler Inspector that boiler has been erected correctly with no leaks. 4. Provide glass front frame in boiler room for Certificate of Inspection.

E. Record readings on check sheet and provide copy to Designer.

F. Record all readings listed above for lowest firing rate.

G. Provide reference card (Lynn Products) at burner; note combustion data test readings.

3.14 PAINTING

A. Equipment installed under this Section shall have shop coat of non lead gray paint. Hangers and supports shall have one coat of non lead red primer. Machinery such as pumps, fans, etc.,

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shall be stenciled with equipment name. Stencil shall be at least 6" high for large equipment, 2" high for small equipment. Finish painting, including painting of various piping and duct systems, shall be done under other Sections.

B. Note requirement for Designer ’s approval invoked under Part 3 article, MATERIALS AND WORKMANSHIP regarding finish of material and equipment which are visible or subject to corrosive or atmospheric conditions.

3.15 EXPANSION PROVISIONS

A. Installation of piping must allow for expansion using offsets, loops, swing joints, expansion joints, etc. as shown and as necessary to prevent undue strain. Take offs from mains to runouts shall not have less than three elbow swing.

B. Mains and risers with loops or offsets shall be securely anchored to structure so as to impart expansion towards loops or offsets. Anchors shall be constructed of heavy forged wrought iron, secured to pipe and to structure. Provide vibration isolation as required.

C. Provide pipe alignment guides as required to guide expanding pipe to move freely from anchor points toward expansion joints, offsets, etc.

3.16 CLEANING

A. Ductwork

1. Ducts shall be thoroughly cleaned so that no dirt or dust shall be discharged from diffusers, registers or grilles, when system is operated. 2. Provide temporary connections required for cleaning. Provide cheesecloth for openings during cleaning. 3. Replace filters prior to final inspection and testing.

B. Piping

1. Furnish pipe cleaning chemicals, chemical feed equipment, materials and labor necessary to clean piping. 2. Permanently install necessary chemical injection fittings complete with stop valves. 3. After chilled water, heating hot water, condenser water, steam and condensate piping have been pressure tested and approved for tightness, clean and flush piping specified under WATER TREATMENT Paragraph. 4. Maintain continuous blowdown and make up, as required during flushing operation.

C. Equipment

1. After completion of project, clean the exterior surface of equipment included in this section, including concrete residue.

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3.17 STARTUP, TESTING AND BALANCING

A. General

1. Provide qualified personnel, equipment, apparatus and services for start up, testing and balancing of mechanical systems, to performance data shown in schedules, as specified, and as required by codes, standards, regulations and authorities having jurisdiction including City Inspectors, DCAMM’s Project Manager and Designer. Note that some ATC start up procedures listed below require the cooperation of the balancing contractor and the rooftop unit manufacturer's representative (if rooftop units are involved) and some balancing procedures require the cooperation of the ATC contractor and the rooftop units manufacturer representative (if appropriate). Ensure that all contractors are present on site during the entire time that these procedures take place. Note that some procedures listed below have a distinct order of precedence, e.g., the testing of the temperature control system shall not occur until major pieces of mechanical equipment have been started up and testing is complete. Ensure that any listed orders of precedence for procedures are followed. 2. Startup, testing and balancing shall not diminish guarantee requirements. 3. Notify Designer and authorities involved at least two weeks before startup testing and balancing begins. 4. Before temperature control testing begins a meeting shall be held between the HVAC engineer, the balancing contractor, the automatic temperature control contractor and the mechanical contractor. The mechanical contractor shall present the HVAC engineer with the completed checklists (contained in this specification) certifying that equipment startup and testing has been completed. The temperature control contractor shall then present his procedures for testing the ATC system to the HVAC engineer for review and approval. Allow one full day for this meeting. 5. When the temperature control testing has been completed a second meeting shall be held. At this time the temperature control contractor shall present the HVAC engineer with the completed controls startup checklist (contained in this specification). The balancing contractor shall present HVAC engineer with certificates of calibration for balancing instruments, proposed balancing forms and proposed balancing procedures to the HVAC engineer, for review and approval. Allow one full day for this meeting. 6. If, through no fault of the Designer, the above two meetings do not take place and the temperature control startup and balancing proceeds the following shall occur. a. All balancing reports shall be rejected. b. The contractors requisition for monies covering the ENTIRE portion of the testing and balancing work will be rejected. Others will be hired to complete the work. These requirements shall be strictly enforced.

7. Do not cover or conceal work before testing and inspection and obtaining approval. 8. Instruments for testing and balancing shall have been calibrated within one month prior to testing and balancing. Calibration shall be traceable to NBS Standards. Provide Photostat of certificate of calibration to Designer ’s representative at meeting demonstrating balancing procedures mentioned in Paragraph 4 above. 9. Leaks, damage and defects discovered or resulting from startup, testing and balancing shall be repaired or replaced to like new condition with acceptable materials. Tests shall be continued until system operates without adjustments or repairs. 10. 1Report on reporting forms, submitted to Designer for approval in advance, and on forms provided by Designer. 11. 1For each piece of equipment, copy nameplate data and include in report.

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12. 1Submit six copies of testing and balancing reports to Designer for approval. 13. 1Provide capacity and performance of equipment by field testing. Install equipment and instruments required for testing, thermo wells and gauge connections at no additional cost to DCAMM. 14. 1Qualified representative of equipment manufacturer shall be present at test. 15. 1Startup, testing and balancing procedures outlined below are the minimum effort required for the project. Contractor shall use any additional procedures he feels will be necessary to properly startup, test and balance the job.

B. Equipment Startup

1. Start up the following pieces of equipment in strict accordance with manufacturers instructions and with manufacturers representative present: a. Boilers b. Chiller c. Cooling towers d. Pumps e. Air handlers f. Fans g. Fan coils h. Rooftop units i. Complete the following checklist to certify to the Designer that startup of the above pieces of equipment has successfully been accomplished. Copy multiple checklists as required. Edit inappropriate items as required.

EQUIPMENT DATE MANUFACTURERS CONSTRUCTION LIST CONFIRMED REPRESENTATIVE MANAGER NAME AND SIGNATURE REPRESENTATIVE NAME AND SIGNATURE BOILERS (LIST NOS. BELOW)

CHILLERS (LIST NOS. BELOW)

COOLING TOWERS (LIST NOS. BELOW)

PUMPS (LIST NOS. BELOW)

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AIR HANDLERS (LIST NOS. BELOW)

FANS (LIST NOS. BELOW)

FAN COILS (LIST NOS. BELOW)

ROOFTOP UNITS (LIST NOS. BELOW)

CLASSROOM UNIT VENTILATORS (BY ROOM/UNIT NO. BELOW)

C. Automatic Temperature Controls Testing

1. Temperature Control Testing General Requirements a. Start up temperature control system so that all sequences of operation called for in Designer’s drawings and specifications operate properly. Ensure that all control components are properly calibrated in accordance with manufacturers instructions. See that all software, included with control system, is fully debugged. For further requirements see automatic temperature control paragraph of these specifications. For requirements requiring letters certifying ATC startup see paragraph 3.1 of these specifications. 2. Temperature Control Testing General Requirements a. Test Temperature Control System after all major pieces of mechanical equipment have been started up, as described above, have been completed and after all tests described in the EQUIPMENT TESTING Paragraph (and elsewhere in Part 2) have been completed. Note portions of ATC test procedures below which require cooperation of balancing contractor. Ensure that balancing contractor is present during entire time when these test procedures take place. b. Where it is said below to confirm or ensure the operation of a particular piece of control equipment, this means to confirm that operation is as called for in the Control Sequence of Operation which are shown on the HVAC drawings or listed in the HVAC specifications. If operation is not as called for by sequences, make any necessary corrective actions so that controls perform as required on Contract Documents. On completion of ATC testing, fill out, sign and return to Designer, the checklist included in this Specification. c. Perform any additional checkout test required by manufacturer for proper system operation whether or not listed below. If any checkout test below conflicts with a particular manufacturer's recommendation bring matter to the attention of Designer immediately.

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d. Where it is stated below to verify pneumatic output to a valve verification shall be done by pressure gauge at E/P transducer controlling valve and by visual confirmation that pneumatic tubing at valve diaphragm is in place. Where it is said to visually confirm damper position it means go to location in the field, open access door and note position of damper blades. If access door does not exist, notify Designer and Construction Manager immediately. EXCEPTION: Do not open air handler casing when fans are on. Note position of AHU dampers, located within AHU casing, by observing operator position. Readings of pneumatic output at CRT, portable terminal or damper position verification by means of feedback potentiometer may be made in addition to but not instead of above measures. e. Where reference is made below to confirming or ensuring operation of a particular item, it shall mean all items of that type, not a representative sample. f. Where it is said below to simulate the operation of a particular cycle for DDC systems, actual control signal inputs at the time of the test shall be temporarily overridden in software and test values substituted. For example to simulate an economizer switchover temperature of 70°F outside temperature with the actual outdoor air input at the DDCFP is 45°F, temporarily substitute 70°F for 45°F in software, perform the test then switch back to the actual input when the simulation is complete. g. Where it is said below to simulate the operation of a particular cycle for pneumatic systems, pneumatic inputs shall be applied to controllers, which correspond to actual conditions to be simulated. For example, to simulate an economizer switchover of 70°F, determine the pneumatic output pressure from the outdoor air temperature transmitter which corresponds to 70°F outdoor temperature, temporarily disconnect and cap the transmitter line and replace it with a pneumatic line fed through a manually adjustable pressure reducing valve. Using a calibrated pressure gauge, in the output line from the PRV, adjust the PRV to produce the pneumatic output to the controller corresponding to 70°F. Perform the test, then replace the transmitter line to the controller. h. Temperature control testing shall not be performed until all pneumatic components have been calibrated in strict accordance with manufacturers instructions. This includes, but is not limited to receiver controllers, temperature transmitters thermostats, transducers, relays and logic networks. Temperature measurements during the calibration process shall be made with an electronic thermometer accurate to 0.25°F. i. Where testing requirements below mention air handling units, this shall mean the fan sections of rooftop units if rooftop units are on the job. 3. Temperature Control Start Up Tests a. With the air handlers supply fan turned off at the motor starter, perform the following tests: (Contractor shall ENSURE that electric power to air handler is OFF). 1) Visually inspect all fans interlocked with the supply fan to ensure that they are off. 2) For VAV units, with the disconnect at the supply fan locked in the off position, open the air handler casing and ensure that the inlet vanes are fully closed. 3) Visually inspect all control dampers and ensure that they are in positions that the control sequences call for them to be when the fan is off. Particularly ensure that the outdoor air damper is fully closed. 4) Note pneumatic outputs to all control valves, and ensure that the valves are in position that the control sequence require them to be when the fan is off.

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For example, if a normally open valve is supposed to be closed when the fan is off, and the valve actuator has a three to 15 psig spring range, ensure that at least 15 psig is output to the actuator. 5) For DDC system confirm by checking CRT that fan status i.e. that fan is off. b. Ensure that all personnel and tools are out of air handler casing, ensure that casing is closed and locked; put any disconnect other than those at starter to the on position. Then have fan started at motor starter and perform the following procedures. 1) For units which are not supposed to start until smoke or outdoor air dampers are proven fully open via limit switches visually observe the damper operators and limit switches when the signal is given to start the fan and ensure that the fan does not start until contact with the limit switch is made. 2) For VAV systems, note pneumatic output to inlet vane operator, ensure that ramp time to vanes fully opening is within tolerance called for by control sequences of operation. For example if a two minute ramp time is called for before vanes fully open, ensure that output to vane operators does not go from minimum to maximum in less than two minutes. 3) Ensure that fans interlocked to air handler supply fan run after AHU fan starts. Visually observe each fan. 4) Adjust freezestat setpoint upwards until freezestat trips confirm stat has tripped with continuity tester. Ensure that fan stops and dampers and valves go to positions outlined in control sequences under "freezestats". Particularly ensure that outdoor air damper is fully closed and heating coil valve is fully open. After test, set freezestat setpoint to design, press manual reset button and confirm that fan restarts. For DDC system ensure that freezestat alarm condition is reported at CRT and line printer when freezestat is activated. 5) With balancing contractor present, test static pressure low and high limit switches as follows: Connect pneumatic tubing to high or low port of limit switch (depending on whether switch is to trip on low or high pressure) connect via a tee, the same pneumatic line to manometer. For a high pressure switch connect tubing to manometer port used for measuring positive static pressure. For a low pressure switch connect tubing to port used for measuring negative static pressure. Slowly blow into tubing and observe manometer. Ensure that switch trips and fan shuts down at pressure called for by control sequence. Confirm that switch has tripped with continuity tester. After test remove test tubing and press manual reset button ensure that fan restarts. For DDC systems ensure that correct alarm message registers at CRT and line printer when switch trips. 6) For DDC systems ensure correct status signal registers at CRT and line printer when fan is on. 7) For DDC system with differential pressure switches across filter bank repeat procedure used to test limit switches and ensure switch trips at correct setpoint. Confirm switch has tripped with continuity tester only (fan should not stop). Confirm dirty filter alarm registers at CRT and printer when switch has tripped. 8) To test units with dry bulb economizer cycles do the following: Simulate outdoor temperature greater than economizer switchover temperature. Ensure that outdoor air damper is in minimum position (or variable outdoor air damper is fully closed if minimum damper is called for in the control sequences). Change discharge air setpoint downwards confirm cooling coil

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valve (if chilled water) modulates open. Change discharge setpoint upwards confirm cooling coil valve modulates closed. Simulate outdoor air temperature below economizer switchover setpoint above discharge air setpoint. Ensure that outdoor air damper (or variable outdoor air damper) fully opens. Change discharge setpoints and ensure cooling coil valve modulates properly. Simulate at least three outdoor air temperature below discharge air setpoint. Ensure that cooling coil valve is closed and that as simulated outdoor temperature is reduced the outdoor air damper and relief damper modulate closed, while the return damper modulates open. 9) For all units with face and bypass dampers, simulate an outdoor temperature of 40°F or below. Note pneumatic output to heating valve to confirm that it is fully open. Note pneumatic output to face and bypass dampers to confirm they are modulating and visually note operator damper positions (i.e., change discharge setpoint and see if output to dampers change). Simulate outdoor air temperature of 42°F or above. Confirm by noting pneumatic output and visually that face damper is fully open, bypass damper is closed. Note that coil valve is modulating (i.e., change discharge setpoint and note variation in pneumatic output). 10) For VAV units have balancing contractor measure static pressure at differential pressure transmitter location with manometer. Ensure that pneumatic input to receiver controller, which controls supply fan inlet vanes, or for DDC systems, duct static pressure reading at CRT, agrees with manometer reading. Change setpoint of transmitter minimum of four times and ensure that input at receiver controller or reading at CRT agrees with manometer reading over range of reading. Ensure that when transmitter setpoint is raised inlet vanes of supply fans modulate open and when transmitter setpoint is lowered inlet vanes modulate closed. Recalibrate transmitter as required. If multiple transmitters are used repeat above procedures for all transmitters. Ensure by measuring pneumatic inputs to selector relay and outputs to receiver controller that supply fan inlet vane position is controlled by lowest reading transmitter. For DDC system ensure that discriminator function in DDC software is functional and supply fan inlet vanes are governed by lowest reading transducer. 11) For headered rooftop units, or air handlers, if controls sequences of operation call for the number of units operating to vary, do the following: a) Initiate the control cycle. Confirm that the number of units operating is as called for in sequences of operation. Confirm that units which are off have their smoke dampers and inlet vanes fully closed. Confirm that non operating units heating furnaces or coils are disabled. b) Change setpoints or thermostat settings such that one or more of the non operating units comes on. Confirm that operating units either stop or have their inlet vanes closed (as called for in sequences) before additional units come on. When additional units come on, confirm that all units operate as called for in sequences of operation including static pressure and discharge air control. 12) Confirm that emergency generator room controls are properly piped and wired. With representative of generator manufacturer present to start the unit, change setpoint of room stat several times to confirm proper operation of dampers and unit heaters.

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13) Confirm that toilet and other exhaust fans start and stop properly via time clock or time clock function in DDC systems. 14) Verify, for DDC systems, that differential pressure switches across pumps give correct pump status when pumps are on or off. 15) For DDC systems confirm alarm setpoints of all alarms listed in sequence of operation in DDC software. Confirm that adequate differentials exist for all alarms to prevent nuisance trapping. Confirm that all field sensors are properly in place and wired to DDCFP. 16) For DDC VAV systems with volumetric controls confirm that velocity pressure transducers are piped correctly to flow measuring stations in both supply and return ductwork. Balancer shall measure supply and return air flows with manometer (take velocity pressure reading convert to velocity than multiply by duct area to get cfm). ATC contractor shall adjust pneumatic output to return fan inlet vane operator to maintain cfm differential with supply. ATC contractor shall simulate changed input from duct mounted static pressure transducer and shall note that supply and return fan inlet vanes modulate appropriately. Balancer shall repeat measurements at flow measuring stations, ATC contractor shall adjust output to return fan inlet vanes. Above procedure shall be repeated as often as necessary to maintain constant cfm differential between supply and return fans between 30% and 100% of maximum flow. 17) At time clock or DDCFP initiate warm-up cycle; ensure ALL control components operate as called for in control sequence of operation. 18) At time clock or DDCFP initiate occupied cycle; ensure ALL control components operate as called for in control sequence of operation. 19) At time clock or DDCFP initiate unoccupied cycle; ensure ALL control components operate as called for in control sequence of operation. 20) For DDC systems test and debug ALL software procedures whether or not listed above. 21) Perform any other tests necessary to verify proper system operation in addition to those listed above.

System No. Construction Manager ATC Representative Representative ATC Cycle Date Confirmed Name and Signature Name and Signature

Fan Differential Pressure Switches Inlet Vanes Posi- tion at Startup Freezestats

Filter Differ- ential Pressure Switches

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Static Pressure Limit Switches Smoke Detectors

Valves Damper Position when Fans are Off Smoke Damper Limit Switches Fan Interlocks

Economizer Cycle Face and Bypass Dampers Headered Rooftop or Air Handler Operation Static Pressure Transducer Calibration Room Thermostat Calibration Emergency Genera- to Controls Toilet Exhaust Fans Start/Stop Chiller Differ- ential Pressure Switches Pumps Differ- ential Pressure Switches Differential Pressure Bypass Valves Alarms

VAV Volumetric Controls

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Warm-up Cycle

Occupied Cycle

Unoccupied Cycle

D. Equipment and Piping Testing

1. Tests: No tests shall be started until systems have been cleaned as described under CLEANING Paragraph. Provide temporary piping and connections for testing, flushing or draining systems to be tested. If leaks develop, repairs shall be made and tests repeated. Tests shall be continued until systems operate without adjustments and repair to equipment or piping. Tests are further specified under other paragraphs of this Section. Test requirement specifically includes, but is not limited to the following: a. Water chilling unit b. Cooling tower c. Pumps d. Air handling units e. Boilers f. ATC compressor 2. Circulating Water Pumps, Chillers and Fans a. Take field measurements on vibration and alignment of pumps, chillers and fans driven by motors over 10 hp. Readings shall include: 1) Shaft alignment 2) Equipment vibration 3) Bearing housing vibration 4) Foundation vibration 5) Building structure vibration 6) Readings directed by Designer 7) Maximum vibration at any point listed shall not exceed 2 mils. b. Refrigeration Systems 1) Test water chilling unit and other refrigeration systems for refrigerant and air leaks at least twice: Approximately six months after start up and at end of guarantee period. 2) Use electronic refrigerant detector for leak detection. 3) Leaks detected shall be properly sealed and above test repeated. 4) Test pressures shall be 300 psi for high pressure side and 150 psi for low pressure side. 5) Replace refrigerant and oil lost during guarantee period at no cost to DCAMM. 6) Certify condition of system in writing after test. c. Hydrostatic Test of Piping 1) Conduct hydrostatic leak tests in accordance with ANSI B31.3, Power Piping Code. 2) Testing medium shall be water at ambient temperature. 3) When designated test pressure is applied, connections shall be inspected by Designer ’s representative for acceptance.

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4) Leaks discovered during testing shall be repaired at no cost to DCAMM; retest system. 5) Isolate system piping from system components during test. 6) If any thermostatic traps are present, isolate and remove them before and during testing. 7) Before test, piping shall be cleaned and flushed as required under CLEANING Paragraph. 8) After testing, stuffing boxes and valves shall be repacked as directed by Engineer. 9) Test pressurized piping system to 150% of design operating pressure, no more than 500 psi and no less than 125 psi. 3. When testing is complete fill in the following checklist certifying satisfactory completion of testing. Make multiple copies of checklist as required, edit out items which are not appropriate.

EQUIPMENT AND PIPING TESTING CHECKLIST

TEST ITEM DATE MANUFACTURERS CONSTRUCTION CONFIRMED REPRESENTATIVE MANAGERS NAME AND SIGNATURE REPRESENTATIVE NAME AND SIGNATURE BURNER/LIGHTOFF & ADJUSTMENT

VIBRATION AND ALIGNMENT

PUMPS

CHILLERS

FANS

REFRIGERATION SYSTEM LEAK TESTS

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HYDROSTATIC TESTS OF PIPING

E. Air and Water Balancing

1. General a. Provide qualified personnel, equipment and services for balancing and adjusting of mechanical systems. Submit resumes at demonstration of balancing meeting. b. Personnel shall be experienced and qualified to perform, record, and evaluate all procedures contained here and/or as outlined on drawings. c. For each air handler on job, provide, under the work of the mechanical section, one spare sheave of size to be determined after traverses are complete. d. Submit procedures, recording forms, and test equipment for review prior to balancing, as described in Paragraph A.4 above. 1) Balancing procedure or sequence is contained herein. 2) Recording forms used for balancing must be submitted to Designer for approval before balancing is started. a) Failure to submit forms will result in rejection of entire submittal. b) Submit description of balancing equipment being used. 3) Balancing shall not begin until system has been installed complete and capable of normal operation. a) All grilles, dampers, fans, coils, pumps, valves and linkages shall be installed and operating prior to balancing. b) System shall be capable of operating under control as specified on drawings and/or contained herein. 4) Independent balancing agency shall have the following qualifications: a) Agency is known to have specialized in balancing commercial HVAC system for at least 3 years. b) Agency shall provide proof of qualifications to Designer ’s satisfaction. Qualification shall include submitted at least three sample balancing reports prepared for commercial HVAC system over 100,000 ft2 in floor area. c) Agency employed balancing technicians shall be qualified to balance HVAC system to Designer ’s satisfaction. Submit resume of technician. d) At least one balancing technician shall remain on from start to acceptance of final balance report. e) Agency shall be approved by Designer. f) Balancing shall be performed by one of the following agencies: . Airflow Associates . E. Barrett . John Coffey and Associates . Leonhardt . Scott TBA Inc. (Manchester, NH) . Wings Air Balance (Brandford, CT)

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2. Air System Balancing a. Testing agency shall balance, adjust and test motors, systems, air moving equipment and distribution, supply, return and exhaust systems, as follows: 1) Adjust blower rpm to design requirements and record. Test and record motor full load amperes. 2) Make pitot tube traverse of main supply, return and exhaust and obtain design cfm at fans. 3) Test and record system static pressure, suction and discharge. 4) Test and record entering air temperatures. 5) Balance and adjust supply air systems in finished areas of building: a) Balance and adjust as required to deliver volume of air at each air outlet within 10% of design flow shown on Drawings. b) Readjust air volumes after occupancy, as required to properly balance heating and cooling loads throughout conditioned areas. 6) Balance supply air systems in unfinished areas: a) Supply air systems shall be balanced after installation of items related to same systems with exception of duct taps to air diffusers in interior zones. b) Balance as required to deliver air volume at outlets within 10% of design flow shown on Drawings. c) Provide sufficient temporary openings in interior zone duct systems to adjust interior zone air volumes. d) Readjust air volumes after completion and occupancy, as required to properly balance heating and cooling loads throughout conditioned areas. 7) Adjust toilet exhaust and relief air systems as required to deliver air volumes at inlets within 10% of design flow. 8) Adjust miscellaneous ventilation systems as required to deliver air volumes at inlets and outlets within 10% of design flow. b. Compile test data and submit to Designer for approval. c. If questions arise, tests or portions of tests shall be repeated in presence of Designer. 3. Air System Balancing: a. Visually inspect all fire, smoke and volume dampers on branch take offs to each floor to ensure that they are fully open. b. Verify with straight edge that fan and motor shafts are parallel and that sheaves are in proper alignment. Use Browning belt tensioner to confirm belts are at proper tension. Refer to deflection tables appropriate for installed belts. c. Start fans, verify that fan rotation is correct. If not, coordinate with electrical contractor to switch power leads such that the fan rotates correctly. d. Verify that fan belts are tight on one side and have slight bow on other side when fan is operating with no excessive squeal at startup. If not correct, adjust sheaves or motor base accordingly. e. Check nameplate voltage on motor, compare to scheduled voltage. Notify Designer immediately of any discrepancies. Measure and record actual voltage across all power leads. Notify Designer of discrepancies immediately. f. For each variable volume air handling unit do the following: 1) Add total cfm of all volume boxes shown on approved shop drawings. 2) Divide this total by the maximum cfm scheduled for the unit to get diversity factor. For example, if total box cfm is 50,000 and AHU is scheduled for 40,000 cfm diversity is 40,000/50,0000 = 80%.

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3) Open (by setting local stats to call for maximum cooling) number of volume boxes necessary to approximate diversity, i.e., in the above example, open 80% of the volume boxes. g. Check motor nameplates full load amps, measure and record amperage across all power leads. If there are marked discrepancies in amperage draws between legs, notify Designer immediately. h. Measure and record fan and motor rpm. Check that motor rpm agrees with nameplate and scheduled rpm. i. Perform static pressure profile as follows: Record all results and submit to Designer. 1) Determine static pressure across supply and return fans as follows: a) Measure static or total pressure at fan suction. b) Measure static pressure at fan discharge. c) Differential is total static pressure developed by fan. 2) Determine static pressure: a) In discharge ductwork after AHU smoke damper. b) Across each filter section. c) Across each coil. d) Across fire and volume dampers at branch take offs to each floor. e) At up to 25 points, in system shown on drawings or to be selected by Designer to be determined when ductwork shop drawings are approved. 3) Determine the correct causes of any excessively high readings, i.e. open throttled dampers, clean dirty coils, etc. Cover all holes when measurements are complete. j. Add 1/2" of static pressure to the system, to simulate the effect of dirty filters. Static may be added by throttling branch volume dampers, blanking off portions of the filter section, covering filter section with cheesecloth or other suitable means. Confirm 1/2" static has been added with new static pressure reading across fan. Open dampers, remove cheesecloth, etc. after traverses are complete. k. Perform pitot tube traverse of supply ducts downstream from AHU discharges and return ducts. Summing CFM totals from diffusers is not an acceptable method of determining total airflow from AHU's. At Designer’s request, show Designer holes where traverses were taken. Perform traverses in accordance with procedures outlined in latest edition of the SMACNA HVAC Testing. Adjusting and Balancing Manual, except that if recommended lengths of straight duct before and after traverse points are not available, increase number of measuring points by 50%. If a 24 point traverse would be called for given the duct cross section area measure 36 points, for example. l. Measure amperage at each power leg after traverse is complete. If an overload condition exists with measured CFM equal to scheduled CFM, notify Designer immediately. m. For economizer systems with ATC contractors presence and assistance, adjust minimum and maximum outdoor air CFM to quantities shown on schedules. Place outdoor air dampers in minimum position as adjusted by ATC contractor. Measure temperature in mixed air plenum, temperature of outdoor air and by proportioning determine % of outdoor air being supplied. Place outdoor air damper in maximum open position or fully open variable outside air damper and repeat above measurements. n. For systems with variable volume boxes or constant volume boxes do the following, with ATC Contractor present for necessary coordination:

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1) At static pressure probe location in field with number of stats necessary to approximate installed diversity calling for full cooling, measure static pressure with manometer and compare with reading registering at DDC system field panel or CRT. The "most critical" volume box shall be determined by the Designer from approved sheet metal shop drawings submittals. Typically the pressure drop from the supply fan outlet to this box inlet is greater than for any other box. Observe damper linkage, at this box, instruct ATC contractor to vary static pressure setpoint as required so that with stats calling for full cooling, most critical box damper is 75% open. (Score line on damper linkage and mark full open and closed positions of box damper. Using protractor mark 75% position open position on volume box.) 2) At each variable volume box, confirm that thermostat and box controller are of the same type (i.e., direct acting or reverse acting). At each variable box and constant volume box disconnect the actuator's pneumatic air line and confirm that box damper fails to position called for on control drawings. 3) At each variable volume box, set thermostat serving box for no cooling. At box test ports take differential pressure reading with magnehelic gauge. Note the magnehelic must be calibrated against a manometer before use. Adjust box minimum position at controller so that differential pressure reading corresponds to box minimum primary air CFM shown on schedules. Place thermostat controlling box to full cooling position. Using magnehelic gauge adjust box controller maximum position setting to produce differential pressure corresponding to box maximum primary air as shown on schedules. Measure CFM's from all diffusers served by box. Confirm total agrees with scheduled box cfm. If box has a reheat coil set start to call for full heating and confirm that box diverting relay switches to heating operation at proper thermostat pressure. With magnehelic gauge confirm differential pressure corresponding to heating CFM. Confirm that P/E's controlling electric heating coils (if any) stage properly. Confirm that hot water control valve modulates open. 4) At each fan box, set thermostat serving box for full heating. At box test ports take differential pressure rating the magnehelic gauge. Adjust box minimum position at controller so that differential pressure reading corresponds to box minimum primary air CFM shown on schedules. With stats continuing to call for full heating, confirm that fan is operating. Measure CFM's or all diffusers that the box serves and adjust fan speed controller, and/or inlet damper to produce CFM for box as shown on schedules. Place thermostat controlling box to full cooling position. Using magnehelic gauge adjust box controller maximum position setting to produce differential pressure corresponding o box maximum primary air as shown on schedules. 5) At each constant volume box, use magnehelic gauge to adjust setpoint of box controller to differential pressure corresponding to velocity (airflow) scheduled for box. o. Balance each diffuser on each floor to within 10% of scheduled values. Follow procedures in SMACNA manual referenced above. p. For constant volume systems, perform pitot tube traverses for branch ducts on each floor. Adjust volume dampers to produce design CFM for each branch. q. Traverse all exhaust ducts. By sheave adjustment or damper throttling balance fans to +10% airflow scheduled on drawings.

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r. Balance supply air systems in unfinished areas: 1) Supply air systems shall be balanced after installation of items related to same systems with exception of duct taps to air diffusers in interior zones. 2) Balance as required to deliver air volume at outlets within 10% of design flow shown on Drawings. 3) Provide sufficient temporary openings in interior zone duct systems to adjust interior zone air volumes. 4) Readjust air volumes after completion and occupancy, as required to properly balance heating and cooling loads throughout conditioned areas. s. For fume hoods, open sash fully. Take six point reading across face of hood using hot wire anemometer or velometer with low flow probe (or average air across entire face of hood with rotating vane anemometer). Adjust volume damper in hood exhaust ductwork so that average velocity across hood face is +100 FPM. 4. Water Balancing and Adjusting a. Balancing shall not begin until systems have been installed complete, including pumps, piping, valves and coils. b. Make adjustments as required to deliver water volumes at coils and equipment within 5% of design flow, or as required to properly balance cooling and heating loads throughout conditioned areas. c. Adjustments in water volumes shall be made in manner satisfactory to Designer. d. Report on system performance shall include: 1) Manufacturer, size, type, location including room number, and zone of each coil and piece of equipment. 2) Design and actual water flow. 3) Complete nameplate data for each piece of equipment reported. 4) Complete identification of data.

3.18 CONTAINMENT ROOM, ANIMAL ROOM SEALING REQUIREMENTS

A. General

1. Work that penetrates or is mounted on ceilings, walls, floors or other surfaces throughout containment rooms or animal facilities shall be sealed as outlined below in addition to sealing specified elsewhere in the Specifications. Sealing shall include but not be limited to the following: a. Diffusers, registers and grilles. b. Ductwork penetrations. c. Piping and tubing (including control tubing). d. Access doors. 2. Completely seal the perimeter joints around all insulated and uninsulated penetrations and surface-mounted items.

B. Products

1. Acceptable sealant materials shall be products that conform to ASTM C920 "Specifications for Elastomeric Joint Sealants". Sealant shall adhere to substrates, and maintain seal under normal expected movements of substrates. 2. Sealant specified herein shall be 732-RTV silicone rubber as manufactured by Dow Chemical Co. or equivalent by GE. Color shall be clear.

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C. Installation

1. Preparation, priming (as applicable), application, curing and protection of the sealant shall be in conformance with the recommendations of the sealant manufacturer. 2. If necessary, fill voids with backer rods as recommended by the sealant manufacturer. 3. Mask edges of exposed joints if required to make neat joints and prevent excessive misplacement of sealant onto exposed surfaces adjacent to joints. 4. Clean surfaces so that no foreign matter of loose particles or dust detrimental to adhesion are present. 5. Perform sealant work after adjacent painting work is complete and dry. 6. Sealant shall be free of voids, be applied in one continuous bead and be tooled concave and smooth. 7. Strip off protective masking tape after sealant has been applied; strip toward the joints. 8. Protect sealant from damage during and after curing period. If damage occurs, repair as required. 9. Clean off excess sealant or sealant smears adjacent to joints by methods and with cleaning materials approved by the manufacturers of the sealant.

END OF SECTION

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STANDARD SPECIFICATIONS

DCAMM Standard Specifications are intended for use only on projects of the Division of Capital Asset Management and Maintenance in the Commonwealth of Massachusetts. The specifications are intended to assist the Designer with incorporating DCAMM and MGL Chapter 149A trade bid requirements in documents used for bidding and construction. Each section will require editing by a registered architect or engineer before issue.

NOTES TO THE DESIGNER

This Section includes typical building systems, but will require significant editing based on your individual Project. Both deletions and additions will be required. Refer to the notes within the body of the text.

Refrigerant shall be CFC free; prefer R134a. Edit section and drawings as applicable.

RESOURCES

None for this Section

END

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