[SUBMITTAL INFORMATION]
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SECTION 23 52 00
HEATING BOILERS (Edited from DeCA June 2017 Design Criteria)
PART 1 - GENERAL
0.1 SUMMARY
A. Section Includes:
1. Boilers. 2. Controls and boiler trim. 3. Hot water connections. 4. Fuel connection.
B. Related Sections:
1. Division 01 Section Mechanical, Refrigeration, Food Service Equipment and Electrical Coordination. 2. Division 01 Section Quality Control. 3. Division 01 Section Closeout Procedure. 4. Division 03 Section Cast-In-Place Concrete. 5. Division 23 Section Hydronic Piping Specialties.
0.2 QUALITY CONTROL
A. The following publications form a part of this specification to the extent they are applicable:
1. Division 01 Section Quality Control. 2. AGA - Directory of Certified Appliances and Accessories.
3. AGA Z21.13 - Gas-Fired Low-Pressure Steam and Hot Water Boilers. 4. ASME SEC 4 - Boiler and Pressure Vessel Codes - Rules for Construction of Heating Boilers. 5. ASME SEC 8D - Boilers and Pressure Vessel Codes - Rules for Construction of Pressure Vessels. 6. HI (Hydronics Institute) - Testing and Rating Standard for Cast Iron and Steel Heating Boilers. 7. NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum). 8. NFPA 54 (AGA Z223.1) - National Fuel Gas Code. 9. NFPA 70 - National Electrical Code. 10. UL - Gas and Oil Equipment Directory.
0.3 SUBMITTALS FOR REVIEW
A. Submit under provisions of Division 01 Section Quality Control.
B. Product Data: Provide capacity and dimensions of manufactured products and assemblies required for this project. Indicate electrical service with electrical characteristics and connection requirements, and duct connections.
C. Shop Drawings: Indicate capacity and dimensions of manufactured products and assemblies required for this project. Indicate electrical service with electrical characteristics and connection requirements, and duct connections.
D. Submit manufacturer's installation instructions.
0.4 SUBMITTALS FOR PROJECT CLOSEOUT
A. Manufacturer's Field Reports: Indicate condition of equipment after start-up including control settings and performance chart of control system.
B. Operation and Maintenance Data: Include manufacturer's descriptive literature, operating instructions, cleaning procedures, replacement parts list, and maintenance and repair data.
C. The Contractor shall submit all certifications and testing data as a supplement to previously submitted O & M manuals at contract closeout.
0.5 QUALITY ASSURANCE
A. Manufacturer Qualifications: Company specializing in manufacturing the Products specified in this Section with minimum three years experience.
0.6 REGULATORY REQUIREMENTS
A. Conform to applicable code and NFPA 70 code for internal wiring of factory wired equipment.
B. Conform to ASME SEC 4 and SEC 8D and AGA Z21.13 and UL 726 for boiler construction.
C. Units: AGA certified, UL labeled.
D. Products Requiring Electrical Connection: Listed and classified by Underwriters Laboratories Inc. as suitable for the purpose specified and indicated.
0.7 DELIVERY, STORAGE, AND PROTECTION
A. Protect units before, during, and after installation from damage to casing by leaving factory shipping packaging in place until immediately prior to final acceptance.
PART 2 - PRODUCTS
0.1 FINNED TUBE BOILERS
A. Manufactured Units:
1. Hot water natural draft boiler with horizontal grid, finned tube heat exchanger, gas burning system, refractory combustion chamber, controls, and boiler trim [including circulator] [and fill system consisting of diaphragm type expansion tank, fill and check valve, and automatic air vent].
B. Fabrication:
1. Assembly: Finned copper tube heat exchanger assembled within combustion chamber conforming to ASME SEC 4 [and SEC 8D] requirements, and tested for maximum working pressure of 160 psi. 2. Combustion Chamber: Line with interlocking refractory insulating panels of vermiculite, high temperature cements, and refractory clay for service temperatures to 2100 deg F. 3. Exchanger: Fabricate of finned copper tubing with stainless steel baffles and sealed into bronze, steel, or cast iron headers with silicone O-ring gaskets. 4. Jacket: Galvanized steel with factory applied baked enamel, insulated with foil faced fiberglass insulation.
C. Fuel Burning System:
1. [Induced Draft] [Separated Combustion] [Atmospheric] Gas Burner: Stainless steel burners for [on-off] [hi-low] [modulating] firing and [natural gas] [propane] with adjustable combustion air supply, gas pressure regulator, diaphragm gas valves, manual shut-off, [intermittent spark or glow coil ignition] [standing pilot], thermistor flame sensing device, and automatic 100 percent safety gas shut-off. 2. Safety Controls: Energize ignition, limit time for establishment of flame, prevent opening of gas valve until pilot flame is proven, stop gas flow on ignition failure, [energize blower motor, and after air flow proven] [and] allow gas valve to open. 3. Flue Gas Collector and Draft Hood: [Integral with boiler casing.] [External] draft diverter [with automatic motorized vent damper]. ] [Integral with boiler casing with built-in [two speed] induced draft fan, with draft gage and draft providing switches.] [Ducted combustion air connection.]
D. Trim:
1. ASME rated pressure relief valve set at [45] [60] psi.
2. Low water cut-off and inlet flow switch to automatically prevent burner operation when water falls below safe level or on low flow through boiler.
E. Controls:
1. Operating Controls: Pre-wired, factory assembled electric control including pilot safety and thermocouple transformer, 24-volt gas valve, manual main and pilot valves, and junction box. 2. Operating temperature controller [with outdoor reset] to control burner operation to maintain supply water temperature at 200 deg F at 0 deg F ambient and 140 deg F at 60 deg F ambient and above. 3. Building Management System Interface: Factory installs hardware and software to enable RMCS to monitor, control, and display boiler status and alarms. Refer to Div 23 Section Refrigeration Monitoring And Control Systems (RMCS) 4. High limit temperature controller with automatic reset for burner to prevent boiler water temperature from exceeding safe system temperature.
0.2 CONDENSING BOILERS
A. Manufactured Units:
1. Factory-fabricated, -assembled, and -tested, condensing boiler with heat exchanger sealed pressure tight, built on a steel base; including insulated jacket; flue-gas vent; combustion-air intake connections; water supply, return, and condensate drain connections; and controls.
B. Fabrication:
1. Heat Exchanger: [Type 316L, stainless-steel] [Carbon-steel] primary and secondary combustion chamber. 2. Pressure Vessel: Carbon steel with welded heads and tube connections. 3. Exhaust Decoupler: Fiberglass composite material in a corrosion-resistant steel box.
C. Fuel Burning System:
1. [Induced Draft] [Separated Combustion] [Atmospheric] Gas Burner: Stainless steel burners for [on-off] [hi-low] [modulating] firing and [natural gas] [propane] with adjustable combustion air supply, gas pressure regulator, diaphragm gas valves, manual shut-off, [intermittent spark or glow coil ignition] [standing pilot], thermistor flame sensing device, and automatic 100 percent safety gas shut-off. 2. Blower: Centrifugal fan to operate during each burner firing sequence and to prepurge and postpurge the combustion chamber.
a. Motors: Minimum size as indicated. If not indicated, large enough so driven load will not require motor to operate in service factor range above 1.0.
3. Safety Controls: Energize ignition, limit time for establishment of flame, prevent opening of gas valve until pilot flame is proven, stop gas flow on ignition failure, [energize blower motor, and after air flow proven] [and] allow gas valve to open. 4. Flue Gas Collector and Draft Hood: [Integral with boiler casing.] [External] draft diverter [with automatic motorized vent damper]. ] [Integral with boiler casing with
built-in [two speed] induced draft fan, with draft gage and draft providing switches.] [Ducted combustion air connection.]
D. Trim:
1. ASME rated pressure relief valve set at [45] [60] psi. 2. Low water cut-off and inlet flow switch to automatically prevent burner operation when water falls below safe level or on low flow through boiler. 3. Condensate Trap: Cast-iron body with stainless-steel internal parts.
E. Controls:
1. Operating Controls: Pre-wired, factory assembled electric control including pilot safety and thermocouple transformer, 24-volt gas valve, manual main and pilot valves, and junction box. 2. Operating temperature controller [with outdoor reset] to control burner operation to maintain supply water temperature at 200 deg F at 0 deg F ambient and 140 deg F at 60 deg F ambient and above. 3. Building Management System Interface: Factory installs hardware and software to enable RMCS to monitor, control, and display boiler status and alarms. Refer to Div 23 Section Refrigeration Monitoring and Control Systems (RMCS). 4. High limit temperature controller with automatic reset for burner to prevent boiler water temperature from exceeding safe system temperature.
PART 3 - EXECUTION
0.1 INSTALLATION
A. Install in accordance with manufacturer's instructions.
B. Install in accordance with NFPA 54.
C. Install boiler on concrete housekeeping base, sized minimum 4 inches larger than boiler base. Refer to Division 03 Section Cast-In-Place Concrete.
D. Provide piping connections and accessories as indicated; refer to Division 23 Section Hydronic Piping Specialties.
E. Pipe relief valves to nearest floor drain.
0.2 MANUFACTURER'S FIELD SERVICES
A. Startup and adjust. Submit Startup Report.
B. Instruct operating personnel in operation and maintenance of units.
END OF SECTION