Excel 10 W7753A Unit Ventilator Controller

APPLICATION GUIDE

Table of Contents Introduction ...... 3 Description of Devices ...... 3 Control Application ...... 4 Control Provided ...... 4 Products Covered...... 4 Organization of Manual ...... 4 Applicable Literature ...... 6 Product Names ...... 6 Agency Listings ...... 6 Abbreviations and Definitions...... 7 Construction ...... 8 Controllers ...... 8 Performance Specifications ...... 9 Environmental...... 10 Inputs/Outputs ...... 10 Analog Inputs...... 10 LONMARK® Functional Profile...... 10 Digital Inputs...... 11 Triac Outputs ...... 11 Wall Modules ...... 11 Air Temperature Sensor ...... 11 Configurations ...... 11 General...... 11 Allowable Heating and Cooling Equipment Configurations ...... 13 Staged Heating/Cooling Control ...... 13 Modulating Heating/Cooling Control...... 14 Control ...... 14 Pneumatic Actuator Control...... 15 Mixed-Output-Type Control ...... 15 Occupancy Sensor ...... 15 Window Open/Closed Digital Input...... 16 Wall Module Options ...... 16 Speed ...... 16 Mixed Air Temperature ...... 16 Outdoor Air Quality CO...... 16 Dirty Filter Monitor ...... 16 Drip Pan Full...... 16 (IAQ) Override ...... 16 ...... 17 ...... 17 Smoke Control...... 17 Modes of Operation...... 17

Application Process ...... 18 Overview ...... 18 Step 1. Define the Control Application ...... 18 Step 2. Create Bill of Materials...... 19 Step 3. Configure Controllers ...... 21 Using LONSPEC™ ...... 22

74-2964-2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Configuration screen for UV Controllers ...... 22 Tab: Output:...... 22 Tab: Input ...... 23 Tab: zone options ...... 23 Tab: custom wiring ...... 24 Tab: pid...... 24 Tab: Economizer ...... 24 Tab: equipment control...... 25 Tab: H/C Stages ...... 25 Tab: Misc ...... 25 Step 4. Controller Checkout ...... 26 Troubleshooting Excel 10 Controllers and Wall Modules...... 26 Temperature Sensor and Setpoint Potentiometer Resistance Ranges...... 26 Alarms ...... 26 Broadcasting the Service Message...... 27 W7753A Controller Status LED...... 28 T7770C,D,E,F Wall Module Remote Override LED ...... 28

Appendices ...... 30 Appendix A: Using LONSPEC™ to Commission a W7753A Controller ...... 30 Sensor Calibration...... 30 Setting PID Parameters ...... 30 Appendix B: Sequences of Operation...... 31 Common Operations ...... 32 Sensor (RmTemp) ...... 32 Remote Setpoint (RmtStptPot) ...... 33 Setpoint Limits (LoSetptLim and HiSetptLim)...... 33 Bypass Mode (StatusOvrd and StatusLed)...... 33 BypassTime...... 33 OverrideType...... 33 OverridePriority ...... 33 Cycles per Hour (HeatCycHr and CoolCycHr) ...... 33 T7770C,D,E,F,G Bypass Pushbutton Operation ...... 33 Standby Mode (StatusOcySen) ...... 34 Continuous Unoccupied Mode ...... 34 Occupancy Mode and Manual Override Arbitration ...... 34 Time Clock (TimeClckOcc)...... 35 Setpoint ramping ...... 35 Fan Operation ...... 35 Window Sensor (StatusWndw)...... 36 Smoke Control...... 36 Demand Limit Control (DLC) ...... 36 Dirty Filter Monitor ...... 36 Start-Up ...... 36 Temperature Control Operations...... 36 Staged Cooling Control ...... 38 Staged Heating Control ...... 38 Cascade Control of Modulating Cooling/Heating ...... 39 Series 60 Modulating Control ...... 39 Pulse Width Modulating (PWM) Control...... 39 AquaStat...... 39 Outdoor Air Lockout of Heating/Cooling...... 39 ASHRAE Control Cycles ...... 39 Standby/Warmup...... 39 Cycle I Control – Fixed Maximum Percentage of Outdoor Air..... 39 Cycle II Damper Control – Fixed Minimum Percentage of Outdoor Air..... 40 Cycle III Damper Control – Variable Outdoor Air Maintaining Constant Mixed Air Temperature ...... 40 Indoor Air Quality (IAQ) Override ...... 40 Outdoor Air Quality (OAQ) Override...... 40 Discharge Air Low Limit Control ...... 40 Economizer Enable/Disable Control (pertains to ASHRAE Cycle II and III) 41 Appendix C: Sensor Data for Calibration ...... 42 Resistance Sensors ...... 42 Voltage/Current Sensors ...... 44

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INTRODUCTION

Description of Devices The W7753A is the Unit Ventilator (UV) controller in the Excel setpoint reset for energy demand limit control, economizer 10 product line family. The Excel 10 UV controller is a minimum position reset for indoor air quality control, standby configurable direct digital controller that controls unit setpoints for energy saving setpoint reset in the occupied ventilators with staged, floating, or pulse width modulation mode and unoccupied setpoints for both heating and cooling. (PWM) heating, cooling, and economizer. The UV controller The control solutions are scalable from stand-alone uses space or return air temperature to sequence heating and installations wired to an external time clock to a networked cooling coils in the unit ventilator to control the temperature in system using a Zone Manager as the network master. The UV the conditioned zone. The UV also uses outdoor air, re- utilizes the Echelon® LONWORKS® network (LONWORKS® circulated or return air from the space, or a mixture of both Bus) for communications, and conforms with the Echelon and is similar to fan coil units except they have the ability to LONMARK® Unit Ventilator (UV) communication profile that supply 100 percent outside air. The UV is designed for many provides true openness and interoperability with third party capacities and is used in areas where occupancy density LONWORKS® devices.(see Fig. 4). indicates a need for controlled ventilation, for example classrooms and conference rooms. Their function allows a The T7770 direct-wired Wall Modules is used in conjunction zone to be controlled independently of other zones in the with W7753A Controllers. The zone controlled by the UV building without using a large central fan system. Controller typically uses a T7770A, which includes a temperature sensor for space temperature measurement. The UV features preprogrammed heating, cooling, Additional features available in T7770E through G models economizer, and ASHRAE Cycles I, II, and III algorithms for include analog setpoint input knob, override digital input standard control applications which are selected using a pushbutton, override status LED, fan speed switch and personal computer and the LONSPEC™ software configuration LONWORKS® Bus network access jack. Fig. 1 shows an tool. The Excel 10 UV controller offers many features required overview of a typical Unit Vent Excel 10 layout. in today’s commercial buildings including energy saving

Q7752A FTT E-BUS C-BUS COMMUNICATION NETWORK SERIAL ADAPTER

EXCEL 10 Q7750A PERSONAL COMPUTER TOOLS FTT ZONE EXCEL 500 E-VISION MANAGER EXCEL BUILDING SUPERVISOR CARE C-BUS TO E-BUS INTERFACE DEVICE Q7740A 2-WAY FTT E-BUS COMMUNICATIONS NETWORK FTT E-BUS COMMUNICATIONS NETWORK REPEATER

Q7751A EXCEL 10 FTT W7750B E-BUS CVAHU ROUTER CONTROLLER

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 EXCEL 10 W7751F PANEL PLENUM MOUNT VERSION EXCEL 10 CONTROLLER T7770E 12 3 4 5 6 7 8 9 10 WALL 11 12 13 14 15 J3

MODULE 31 30 29 28 27 26 25 24 23 22 21 20 DI-4 GN 24 19 18 D DI-3 DI-2 24 1 17 EXCEL 10 GND VAC 2 16 DI-1 V 3 4 AC COM OUT O 5 6 UT OUT O 7 8 UT OUT OU T OUT OUT W7752 FTT CONTROLLER 70 65 75

60 80

55 85

auto 0 1

E LED BYPASS SN GND SR GND SET PT AI-1 GND A 1-2 AI-3 OHM GND AI-4 2 12 OHM V/m 2VDC E-BU 3 4 A V/mA S E-BUS 5 6 7 OUT 8910 JACK 11 12 13 14 15 J3 M24151

EXCEL 10 W7753A UNIT EXCEL 10 T7770 VENTILATOR CONTROLLER WALL MODULE Fig. 1. Typical Unit Vent Excel 10 overview.

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Control Application The UV Controller can monitor a space-mounted occupancy sensor, and a door/window contact. These inputs affect the The Excel 10 UV Controller is a configurable direct digital operational mode of the controller (see Table 3 for a list of all controller that controls unit ventilators with staged, floating, or possible modes of operation). pulse width modulation (PWM) heating, cooling, and economizer. The UV controller uses space or return air The UV controller allows other controllers in the system to use temperature to sequence heating and cooling coils in the unit the physical inputs and outputs. A digital input and an analog ventilator to control the temperature in the conditioned zone. It input can be configured to read switch states and voltage features preprogrammed heating, cooling, economizer, and sensor values respectively, and send them out over the ASHRAE Cycles I, II, and III algorithms for standard control LONWORKS® Bus network. Another device, such as the applications that are selected using a personal computer and Q7750A Zone Manager, can use these values in custom the LONSPEC™ software configuration tool. The Excel 10 UV control strategies. Additionally, two of the UV digital outputs Controller offers many features required in today’s commercial are available for control program use. These outputs only buildings including energy saving setpoint reset for energy respond to signals sent over the network, and are not demand limit control, economizer minimum position reset for controlled by the W7753A internal control algorithms. indoor air quality control, standby setpoints for energy saving setpoint reset in the occupied mode and unoccupied setpoints for both heating and cooling. The control solutions are Products Covered scalable from stand-alone installations wired to an external This Application Guide describes how to apply the Excel 10 time clock, to a networked system using a Zone Manager as family of W7753A UV Controllers and related accessories to the network master. The UV is typically connected to a T7770 typical applications. The specific devices covered include: Wall Module which incorporates a temperature sensor, • W7753A Controllers. setpoint, fan speed controls, and a bypass or override button. • T7770A and E through G Wall Modules. Fig. 2 shows a typical UV control application. • Q7790 Wireless / LONWORKS® Receiver. • Q7760A Serial Interface Adapter. Control Provided • Q7740A,B Repeaters (2-way and 4-way). • 209541B FTT Termination Module. The UV controller provides control by using a single space temperature (or return air temperature) control input. A discharge air temperature sensor is required for floating or Organization of Manual PWM control of an economizer which is used for monitoring This manual is divided into three basic parts: the Introduction, and economizer low limit control. The controller does not the Application Steps, and the Appendices that provide provide discharge air temperature control to a programmable supporting information. The Introduction and Application discharge air temperature setpoint and cannot be used for Step 1 provide the information needed to make accurate discharge air temperature control applications. The UV material ordering decisions. Application Step 2 and the controller has a mixed air temperature input and can provide Appendices include configuration engineering that can be mixed air temperature control using the economizer. The started using Excel LONSPEC™ PC Software after the devices economizer dampers position can be adjusted based on and accessories are ordered. Application Step 3 is indoor air quality (IAQ) needs in the space. IAQ monitoring is troubleshooting. provided through either a C7232 CO2 sensor or a digital input from a space-mounted IAQ limit switch. No internal time clock The organization of the manual assumes a project is being is available in the Excel 10 UV Controller. For stand-alone engineered from start to finish. If an operator is adding to, or is applications, an external time clock will be required. If the UV changing an existing system, the Table of Contents can is connected to the LONWORKS® Bus, then it gets its time provide the relevant information. schedule information from other Controllers.

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HI FAN LINE DISCHARGE SPEED MED AIR SENSOR LO VOLTAGE LOAD COM LOAD POWER CCW COM FLOATING HEATING ACTUATOR CW COIL HOT WATER OR STEAM

COMPRESSOR COOLING COIL DRAIN PAN CCW COM FLOATING + ACTUATOR CW 24 VAC -

RA OA DAMPERS

OUTSIDE AIR S 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 SENSOR + OUT 1 OUT 2 OUT 3 OUT 6 OUT 7 OUT OUT 4 OUT 5 OUT 8 OUT 24 VAC 24 VAC 24 VAC COM 24 VAC DI-4 DI-3 DI-2 DI-1 GND GND

W7753A TRIAC EQUIVALENT CIRCUIT UNIT VENTILATOR CONTROLLER

E-BUS SNSR GND SETPT GND GND E-BUS JACK 1 LED BYPASS AI-3 V/mA AI-3 V/mA AI-4 V/mA AI-4 V/mA E GND AI-1 OHM AI-2 OHM 22 VDC OUT 22 VDC OUT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 J3

2

??E-BUS??

2 9 8 7 6 5 4 3 2 1

LED OUTSIDE SET PT PT SET

BYPASS BYPASS SPD FAN AIR CO SENSOR E-BUS E-BUS GND SENSOR 1 EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.O MM2) WITH A MINIMUM T7770F OF 18 AWG (1.O MM2), FOR EARTH GROUND WIRE. WALL 2 TO ASSURE PROPER ELECTRICAL CONTACT, JACK FOR E-BUS WIRES MUST BE TWISTEDTOGETHER BEFORE MODULE NETWORK INSERTION INTO THE TERMINAL BLOCK. ACCESS M12691

Fig. 2. Typical W7753A control application.

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Applicable Literature The T7770 Wall Module is available in seven models. The T7770 Wall Modules will work with all Excel 10 Controllers The following list of documents contains information related to (except the W7751A,C,E,G): the Excel 10 W7753A UV Controller and the Light Commercial • T7770A1006 Wall Module with nonlinearized 20 Kohm Building Solution (LCBS) in general. NTC sensor only. • T7770A2004 Wall Module with nonlinearized 20 Kohm Form no. Title NTC sensor and LONWORKS® Bus network jack. 74-2076C Excel 10 Technical Literature Collation • T7770B1xxx Wall Module with nonlinearized 20 Kohm NTC sensor, 10 Kohm setpoint, and LONWORKS® Bus 74-2962 Excel 10 W7753A Controller Specification Data network jack. 74-2697 T7770A,B,C,D,E,F,G Wall Module Specification • T7770C1xxx Wall Module with nonlinearized 20 Kohm Data NTC sensor, 10 Kohm setpoint, bypass button and LED, 74-2868 C7770A Air Temperature Sensor Specification and LONWORKS® Bus network jack. Data • T7770D1xxx Wall Module with nonlinearized 20 Kohm NTC sensor, bypass button and LED, and LONWORKS® 74-2954-1 Excel 10 Q7760A Serial Interface Specification Bus network jack. Data • T7770E1xxx Wall Module with nonlinearized 20 Kohm 74-2858 Excel 10 Q7740A,B FTT Repeaters NTC sensor, 10 Kohm setpoint, bypass button and LED, Specification Data three position fan switch, and LONWORKS® Bus network jack. 95-7520 Excel 10 W7753A Controller Installation • T7770F1xxx Wall Module with nonlinearized 20 Kohm Instructions NTC sensor, 10 Kohm setpoint, bypass button and LED, 95-7538 T7770A,B,C,D,E,F,G Wall Module Installation five position fan switch, and LONWORKS® Bus network Instructions jack. 95-7511 Excel 10 Q7760A Serial Interface Installation • T7770G1xxx Wall Module with nonlinearized 20 Kohm Instructions NTC sensor, bypass button and LED, five position fan switch, and LONWORKS® Bus network jack. 95-7516 Excel 10 SLTA Connector Cable Installation Instructions NOTE: The T7770B,C Models are available with a absolute 95-7555 Excel 10 Q7740A,B FTT Repeaters Installation 55 to 85°F (10 to 85°C) or a relative scale plate Instructions adjustable in LONSPEC™ to ± 18°F (± 5°C). 95-7554 Excel 10 209541B Termination Module Other products: Installation Instructions • Q7760A Serial Adapter. 74-2588 Excel LONSPEC™ User’s Guide • Q7740A,B FTT Repeaters. • 209541B FTT Termination Module. 74-2865 LONWORKS® Bus Wiring Guidelines User’s Guide Refer to Table 5 for a complete listing of all available part 74-3679 LCBS System Engineering Guide numbers.

Product Names Agency Listings The W7753 UV Controller is available in one model: Table 1 provides information on agency listings for Excel 10 — W7753A Unit Ventilator Controller. products.

Table 1. Agency Listings. Device Agency Comments W7753A UL Tested and listed under UL916 (file number E87741). Controller cUL Listed (E87741). CE General Immunity per European Consortium Standards EN50081-1 (CISPR 22, Class B) and EN 50082-1:1992 (based on Residential, Commercial, and Light Industrial). EN 61000-4-2: IEC 1000-4-2 (IEC 801-2) Electromagnetic Discharge. EN 50140, EN 50204: IEC 1000-4-3 (IEC 801-3) Radiated Electromagnetic Field. EN 61000-4-4: IEC 1000-4-4 (IEC 801-4) Electrical Fast Transient (Burst).

Radiated Emissions and Conducted Emissions: EN 55022: 1987 Class B. CISPR-22: 1985 FCC Complies with requirements in FCC Part 15 rules for a Class B Computing Device. Operation in a residential area can cause interference to radio or TV reception and require the operator to take steps necessary to correct the interference.

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Device Agency Comments T7770A through G UL (Not applicable.) Wall Modules CSA (Not applicable.) FCC (Not applicable.) Q7740A,B FTT UL UL1784. Repeaters, CSA Listed. Q7760A Serial Adapter FCC Complies with requirements in FCC Part 15 rules for a Class B Computing Device.

Abbreviations and Definitions EPROM - Erasable Programmable Read Only Memory; the firmware that contains the control algorithms for the AHU - Air Handling Unit; the central fan system that Excel 10 Controller. includes the blower, heating equipment, cooling equipment, ventilation air equipment, and other FCU - Fan Coil Unit. related equipment. Firmware - Software stored in a nonvolatile memory CO - Carbon Monoxide. Occasionally used as a measure medium such as an EPROM. of indoor air quality. Floating Control - Refers to Series 60 Modulating Control CO2 - Carbon Dioxide. Often used as a measure of indoor of a valve or damper. Floating Control utilizes one air quality. digital output to pulse the actuator open, and another digital output to pulse it closed. CPU - Central Processing Unit; a Light Commercial Building Solution (LCBS) controller module. FTT - Free Topology Transceiver.

cUL - Underwriters Laboratories Canada IAQ - Indoor Air Quality. Refers to the quality of the air in the conditioned space, as it relates to occupant CVAHU -Constant Volume AHU; refers to a type of air health and comfort. handler with a single-speed fan that provides a constant amount of supply air to the space it serves. I/O - Input/Output; the physical sensors and actuators connected to a controller. DDF - Delta Degrees Fahrenheit. I x R - I times R or current times resistance; refers to Ohm’s D/X - Direct Expansion; refers to a type of mechanical Law: V = I x R. cooling where is (expanded) to its cold state, within a heat-exchanging coil that is mounted K - Degrees Kelvin. in the air stream supplied to the conditioned space. Level IV - Refers to a classification of digital Echelon® - The company that developed the LON® bus communication wire. Formerly known as UL Level IV, and the Neuron® chips used to communicate on the but not equivalent to Category IV cable. If there is LONWORKS® Bus. any question about wire compatibility, use Honeywell-approved cables (see Step 5 Order Economizer - Refers to the mixed-air dampers that Equipment section). regulate the quantity of outdoor air that enters the building. In cool outdoor conditions, fresh air can be LONSPEC™ - User interface software used with devices used to supplement the mechanical cooling that use FTT LONWORKS® Bus communications equipment. Because this action saves energy, the protocol. dampers are often referred to as economizer dampers. LONWORKS® Bus - Honeywell implementation of Echelon LONWORKS® network for communication among EMI - Electromagnetic Interference; electrical noise that Excel 10 Controllers. can cause problems with communications signals. LONWORKS® Bus Segment - A LONWORKS® Bus section EMS - Energy Management System; refers to the containing no more than 60 Excel 10s. Two controllers and algorithms responsible for calculating segments can be joined together using a router. optimum operational parameters for maximum energy savings in the building. NEC - National Electrical Code; the body of standards for safe field-wiring practices. EEPROM - Electrically Erasable Programmable Read Only Memory; the variable storage area for saving user NEMA - National Electrical Manufacturers Association; the setpoint values and factory calibration information. standards developed by an organization of companies for safe field wiring practices. Enthalpy - The energy content of air measured in BTUs per pound (KiloJoules per Kilogram).

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Node - A Communications Connection on a network; an W7761 - The model number of the Excel 10 RIO Device Excel 10 Controller is one node on the LONWORKS® (also see RIO). Bus network. Wall Module - The Excel 10 Space Temperature Sensor NV - Network Variable; an Excel 10 parameter that can be and other optional controller inputs are contained in viewed or modified over the LONWORKS® Bus the T7770 Wall Modules. See Application Step 5. network. Order Equipment for details on the various models of Wall Modules. PC - An IBM compatible Personal Computer with 386 or higher processor and capable of running Microsoft® Windows® Version 3.1. Construction

Pot - Potentiometer. A variable resistance electronic Controllers component located on the T7770B,C,E,F Wall Module; used to allow user-adjusted setpoints to be The Excel 10 W7753A Controller is available in one model. input into the Excel 5000 or Excel 10 Controller. The W7753A consists of a single circuit board that is mounted in a sheet metal subbase and protected by a factory snap-on PWM - Pulse Width Modulated output; allows analog cover. The controller mounts with two screws. Using DIN rail modulating control of equipment using a digital adapters, they can also be snapped onto standard EN 50 022 output on the controller. 35 mm by 7.5 mm (1-3/8 in. by 5/16 in.) DIN rail. DIN rail is available through local suppliers. If using DIN rail also RIO - Remote Input/Output device. purchase from Augat Inc. part number 2TK2D DIN rail (adapter) two each for every controller. See the Installation RTD - Resistance Temperature Detector; refers to a type of Instructions for details (form no. 95-7520). Wires are attached temperature sensor whose resistance output to the screw terminal blocks on both sides of the controller. changes according to the temperature change of the Connection for operator access to the LONWORKS® Bus is sensing element. provided by plugging the SLTA connector cable into the communications jack. TOD - Time-Of-Day; the scheduling of Occupied and Unoccupied times of operation. PERFORMANCE SPECIFICATIONS

TPT - Twisted Pair Transceiver. Power 24 Vac with a minimum of 20 Vac and a maximum of 30 Vac at UV - Unit Ventilator Controller. either 50 or 60 Hz. The W7753A power consumption is 6 VA maximum at 50 or 60 Hz. The W7753A is a NEC Class 2 rated VA - Volt Amperes; a measure of electrical power output or device. This listing imposes limits on the amount of power the consumption as applies to an ac device. product can consume or directly control to a total of 100 VA (U.S. only). Vac - Voltage alternating current; ac voltage rather than dc voltage. The individual Triac outputs incorporate an internal common connection with the input power transformer. The Triacs VAV - Variable Air Volume; refers to either a type of air provide a switched path from the hot side (R) of the distribution system, or to the W7751 Excel 10 VAV transformer through the load to the common of the Box Controller that controls a single zone in a transformer. The UV controller design must use the same variable air volume delivery system. power transformer for any loads connected to that controller; see Fig. 22. VOC - Volatile Organic Compound; refers to a class of common pollutants sometimes found in buildings. Each individual Triac is rated 500 mA at 30 Vac maximum. Sources include out-gassing of construction Under all operating conditions, the maximum load/source materials, production-line by-products, and general power budget for the controller is 100 VA. cleaning solvents. A VOC is occasionally used as a measure of indoor air quality. CPU Motorola or Toshiba 3150 Neuron® processor, containing W7750 - The model number of the Excel 10 CVAHU three eight-bit CPUs. Each Neuron has a unique 48-bit Controllers (also see CVAHU). network identification number.

W7751 - The model number of the Excel 10 VAV Box Memory Capacity Controllers (also see VAV). • 64K ROM/PROM (6K reserved for network operations, 58K usable for control algorithm code). W7752 - The model number of the Excel 10 FCU • 512 bytes EEPROM. Controllers (also see FCU). •2K RAM.

W7753 - The model number of the Excel 10 UV Controllers Specified Space Temperature Sensing Range (also see UV). 45 to 99°F (7 to 37°C) with an allowable control setpoint range from 50 to 90°F (10 to 32°C) when initiated from the network and 55 to 85°F (13 to 29°C) when configured and connected to T7770 Wall Modules.

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Communications (400m). In the event that the total wire length is exceeded, The UV controller uses a transformer-coupled then a Q7740A 2-Way Repeater or a Q7740B 4-Way communications port with differential Manchester-encoded Repeater can be used to allow the number of devices to be data at 78 kilobits per second (kbs). The transformer-coupled spread out as well as increasing the length of wire over which communications interface offers a much higher degree of they communicate. The maximum number of repeaters per common-mode noise rejection while ensuring dc isolation. segment is one (on either side of the router). A Q7751A LONWORKS® Bus Router can also be used to effectively Approved cable types for LONWORKS® Bus communications double the maximum LONWORKS® Bus length. The advantage wiring is Level IV 22 AWG (0.34 mm2) plenum or non-plenum of using the router is that it will segregate traffic to a segment rated unshielded, twisted pair, solid conductor wire. For non- while when using the repeater, all traffic is repeated on each plenum areas, use Level IV 22 AWG (0.34 mm2) such as U.S. segment. When utilizing a doubly terminated LONWORKS® part AK3781 (one pair) or U.S. part AK3782 (two pair). In Bus structure, use a continuous daisy-chain with no stubs or plenum areas, use plenum-rated Level IV, 22 AWG (0.34 taps from the main backbone, The maximum LONWORKS® mm2) such as U.S. part AK3791 (one pair) or U.S. part Bus length is 4593 ft (1400m) with the maximum node-to- AK3792 (two pair). (See Tables 9 and 10 for part numbers.) node length of 3773 ft (1150m). Contact Echelon Corp. Technical Support for the recommended vendors of Echelon approved cables. FTT networks are very flexible and convenient to install and maintain, but it is imperative to carefully plan the network A channel in the cover allows the controller status LED to be layout and create and maintain accurate documentation. visible when the cover is in place. There are no field- Unknown or inaccurate wire run lengths, node-to-node serviceable parts on the circuit board and, therefore, it is distances, node counts, total wire length, and misplaced or intended that the cover never be removed. missing terminators can cause poor network performance. Refer to LONWORKS® Bus Wiring Guidelines form no. The W7753A can be mounted in any orientation. Ventilation 74-2865, for complete description of network topology rules. openings were designed into the cover to allow proper heat dissipation regardless of the mounting orientation. See Fig. 3. ENVIRONMENTAL

Operating Temperature: -40 to 150°F (-40 to 65.5°C).

Shipping Temperature: -40 to 150°F (-40 to 65.5°C).

Relative : 5% to 95% noncondensing.

31 30 29 28 27 26 25 Vibration: Rated V2 level compliant. 24 23 22 21 20 DI-4 GND 24 19 18 17 DI-3 DI-2 GND 24 VAC 1 2 16 DI-1 VAC 3 4 COM OUT OUT 5 6 7 OUT OUT OUT 8 OUT OUT OUT INPUTS/OUTPUTS The W7753A Controller supports the following hardware features: • Four 20 Kohm NTC (1000 through 150,000 ohm) or PT3000 (250 through 12,000 ohm) resistive analog inputs (one reserved for space temperature and one reserved for the setpoint knob). • Two 0.2 to 10 VDC or 2 to 20 mA (user selectable) analog inputs. • Five dry contact digital inputs (one reserved for the Bypass pushbutton). • Eight 24 Vac Triac digital outputs (500 mA MAX). • LED digital output (only for the wall module LED). E LED BYP ASS SNSR GND GND SET PT AI-1 GND A1-2 • One 22 Vdc power supply for auxiliary devices with a OHM AI-3 GND AI-4 1 OHM V/mA 22VDC E-BUS 2 3 4 V/mA E-BUS 5678 OUT maximum current of 50 mA. 9 10 11 JACK 12 13 14 15 J3 ANALOG INPUTS

Space Temperature: Type: RTD.

M12688 Supported Sensors: T7770A,B,C,D,E,F,G, C7772A.

Fig. 3. Excel 10 W7753A Unit Ventilator Controller. Discharge Air Temperature: Type: RTD. The Free Topology Transceiver (FTT) supports polarity Supported Sensors: C7100A1015*, C7770A1006. insensitive free topology wiring. This frees the system installer from the need to wire using a bus topology. Star, bus, mixed, Outdoor Air Temperature: and loop wiring are all supported by this architecture. The Type: RTD. maximum LONWORKS® Bus length when using a combination Supported Sensors: C7170A1002. of star, loop, and bus wiring (singly terminated) is 1640 ft (500m) with the maximum node-to-node length of 1312 ft

9 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Return Air Temperature: Type: RTD. Hardware Output Supported Sensors: C7100A1015*, C7770A1006, C7041B, C7041C, C7041D, C7041F, C7041J, C7041K, C7041R. Unit Ventilator Controller number 8080

Mixed Air Temperature: nviSpaceTemp nvoSpaceTemp nv1 SNVT_ temp_p nv21 SNVT_ temp_p Type: RTD. Mandatory Supported Sensors: C7100A1015*, C7770A1006, C7041B, Network nv22 nvoEffectSetpt C7041C, C7041J, C7041K, C7041R. Variables SNVT_ temp_p * The PT3000 sensor is not recommended for floating control nv23 nvoUnitStatus SNVT_hvac_status (real time - discharge or return configured as space sensor). The PT3000 sensor is intended for monitoring or differential nv2 nviSetpoint nv24 nvoEffectOccup (staged) control. SNVT_temp_p SNVT_ occupancy

nv3 nviSetptOffset nv25 nvoHeatCool LONMARK® FUNCTIONAL PROFILE SNVT_ temp_p SNVT_ hvac_mode

W7753 Controllers support the LONMARK® Functional nv4 nviSetptShift nv26 nvoSetpoint SNVT_ temp_setpt Optional SNVT_temp_p Profile number 8080 Unit Ventilator Controller, version 1.0 Network (see Fig. 4). nviOccSchedule nvoSetptShift nv5 SNVT_ tod_event Variables nv27 SNVT_ temp_setpt

nvoFanSpeed nv6 nviOccManCmd nv28 SNVT_occupancy SNVT_switch

nviOccSensor nvoDischAirTemp nv7 SNVT_occupancy nv29 SNVT_ temp_p

nv8 nviApplicMode nv30 nvoLoadAbsK SNVT_hvac_mode SNVT_ power_kilo

nviHeatCool nvoTerminalLoad nv9 SNVT_hvac_mode nv31 SNVT_ lev_percent

nviFanSpeedCmd nvoHeatPrimary nv10 SNVT_switch nv32 SNVT_ lev_percent

nviComprEnable nvoHeatSecondary nv11 nv33 SNVT_switch SNVT_ lev_percent

nviAuxHeatEnable nvoCoolPrimary nv12 SNVT_switch nv34 SNVT_ lev_percent

nviEconEnable nvoOADamper nv13 SNVT_switch nv35 SNVT_ lev_percent

nviEnergyHoldOff nvoSpaceRH nv14 SNVT_switch nv36 SNVT_ lev_percent

nvoOutdoorRH nv15 nviValveOverride nv37 SNVT_hvac_overid SNVT_ lev_percent

nviEmergOverride nvoOutdoorTemp nv16 SNVT_hvac_emerg nv38 SNVT_ temp_p

nviSourceTemp nvoSpaceCO2 nv17 SNVT_ temp_p nv39 SNVT_ppm

nviOutdoorTemp nvoEnergyHoldOff nv18 SNVT_ temp_p nv40 SNVT_switch

nviSpaceRH nv19 SNVT_ lev_percent

nviOutsideRH nv20 SNVT_lev_percent

nviSpaceCO2 nv21 SNVT_ppm

Configuration Properties nc49 - Send Heartbeat (mandatory) nc60 - Occupancy Temperature Setpoints (mandatory) nc52 - Minimum Send Time (optional) nc48 - Receive Heartbeat (optional) nc17 - Location Label (optional) nc34 - Local Bypass Time (optional) nc35 - Manual Override Time (optional) nc23 - Outdoor Air Damper Minimum Position (optional) nc42 - Space CO2 Limit (optional) nc36 - Space Humidity Setpoint (optional) nc59 - Number of Heating/Cooling Valves (optional)

Manufacturer Defined Section

Hardware Input M11937

Fig. 4. Functional Profile number 8080 of LONMARK® Unit Ventilator object details (variables not implemented in Excel 10 UV are greyed).

74-2964—2 10 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Fan Speed Switch: — Monitor Switch: Single or three speed auto/off/on control via the wall module. Contact Closed = Monitor switch is Closed — Coil Freeze Stat: Outdoor Air Humidity: Contact Closed = Coil Freeze Condition sensed Type: Voltage/Current. — Aquastat - Make on Temp Rise: Supported Sensors: H7635C1002 (4 to 20mA or 0 to 10 Vdc). Contact Closed = Heating, Contact Open = Cooling — Aquastat - Break on Temp Rise: Room or Air Humidity: Contact Closed = Cooling, Contact Open = Heating Type: Voltage/Current. — Time Clock: Supported Sensors: H7625, H7635, H7655 (4 to 20mA or 0 to Contact Closed = Occupied Mode; Contact Open = 10 Vdc), C7600B2008 (2 to 10V), C7600C1008 (4 to Unoccupied Mode 20mA). — Drip Pan: Contact Closed = Drip Pan is Full Outdoor Air Enthalpy: — Economizer Enable Signal: Type: Current. Contact Closed = Outside Air Suitable for Cooling Supported Sensors: C7400A1004 (4 to 20mA). — Wall Module Bypass Pushbutton: Momentary DI (See Appendix B—Sequences of Operation Return Air Enthalpy: for bypass details.) Type: Current. Supported Sensors: C7400A1004 (4 to 20mA). TRIAC OUTPUTS

Air Filter Differential Pressure: Triac Outputs on the UV Type: Voltage. — Power ratings: 20 Vac to 30 Vac at 25 mA MIN to 500 mA Supported Sensors: P7640A, B, 0 to 5 inw differential pres- MAX current for any voltage. sure sensors.

Room or Duct CO2 Sensor: Type: Voltage. CAUTION Supported Sensors: C7232A, B or C7632A, B, 0 to When any device is energized by a Triac, the device must be able to sink a minimum of 25 mA. 2000 ppm CO2 sensors.

Outdoor Air CO Sensor: NOTE: Triacs sink current to the 24 Vac common Type: Current. (COM terminal). Supported Sensors: Third party 4 to 20mA, 0 to 300 ppm CO sensor. IMPORTANT If non-Honeywell motors, actuators, or transducers Monitor Sensor for network use: are to be used with Excel 10 Controllers, Triac Type: Voltage. compatibility must be verified (see previous NOTE). Supported Sensors: Third party 2 to 10V, 2 to 10 volts dis- played. Wall Modules The T7770 Wall Modules for the Excel 5000 and Excel 10 DIGITAL INPUTS Controllers are available in a variety of configurations. See the Dry-contact inputs are sensed using a 9 milliamp at 4.8 volts Installation instructions for each model for dimension details. detection circuit. It is very important that the device used contains high quality, noncorroding contacts with resistivity that does not degrade; that is, increase over time. Use noble Air Temperature Sensor metal (such as gold or silver), or pimpled or sealed contacts to The C7770A Air Temperature Sensor for the Excel 10 assure consistent, long-term operation. Controllers contains a nonlinearized 20 Kohm NTC thermistor.

Four of the following Digital Inputs (DIs) can be configured: * The PT3000 sensor is not recommended for floating control — Occupancy Switch: (real time - discharge or return configured as space sensor). Contact Closed = Room is Occupied; Contact Open = The PT3000 sensor is intended for monitoring or differential Room is Unoccupied (staged) control — Fan Status: Contact Closed = Fan on —IAQ Switch: Configurations Contact Closed = Poor Air Quality — Smoke Monitor: General Contact Closed = Smoke Detected Table 2 provides an overview of the Excel 10 W7753A — Dirty Filter: configuration options. All W7753As are assumed to have a Contact Closed = Dirty Filter supply fan digital output. Additionally, Table 2 lists the general — Shutdown Signal: mechanical equipment options available with the W7753A Contact Closed = Shut off all equipment Controller. See Application Step 2 Configure Controllers, for — Window Monitor: further information on configurations. Contact Closed = Window is Closed

11 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

CAUTION For floating control, the Excel 10 W7753A Controller is designed to work only with Series 60 valve and damper actuators. Full stroke actuator drive-time must be between 20 and 240 seconds (0.25 to 4.0 minutes).

Table 2. Configuration Options Summary For The W7753A Controller. Option Possible Configurations Supply Fan 1. Mandatory Digital Output (Single or Three Speed). Type of Heating 1. One stage. 2. Two stages. 3. Series 60 Modulating electric valve, or pneumatic via transducer. 4. Pulse Width Modulating electric valve, or pneumatic via transducer. 5. None. Type of Cooling 1. One stage. 2. Two stages. 3. Series 60 Modulating electric valve, or pneumatic via transducer. 4. Pulse Width Modulating electric valve, or pneumatic via transducer. 5. None. Type of 1. Digital Output Enable/Disable signal for controlling an external economizer package. Economizer 2. Series 60 Modulating electric damper motor, or pneumatic via transducer. 3. Pulse Width Modulating electric damper motor, or pneumatic via transducer. 4. None. Proof of Air Flow 1. None. 2. Physically Connected: Contacts closed equals Fan On. Occupancy 1. None. Sensor 2. Connected: Contacts closed equals Occupied. 3. Network (Occ/Unocc signal received via the LONWORKS® Bus network). Window Sensor 1. None. 2. Physically Connected: Contacts closed equals window closed. 3. Network (Window Open/Closed signal received via the LONWORKS® Bus). Wall Module 1. Local (direct wired to the controller). Option 2. Network (sensor value received via the LONWORKS® Bus). Wall Module 1. Sensor only. Type 2. Sensor and Setpoint adjust. 3. Sensor, Setpoint adjust and Bypass. 4. Sensor and Bypass. 5. Sensor, Setpoint adjust, Bypass and 3 position fan switch. 6. Sensor, Setpoint adjust, Bypass and 5 position fan switch. 7. Sensor, Bypass and 5 position fan switch. Smoke 1. None. Emergency 2. Physically Connected: Contacts closed equals smoke detected. Initiation 3. Network (Emergency/Normal signal received via the LONWORKS® Bus). IAQ Option 1. None. 2. Local IAQ Digital Input—directly wired to the controller. (Contacts closed means poor IAQ is detected.) 3. Network (Emergency/Normal signal received via the LONWORKS® Bus).

4. Local CO2 Analog Input—directly wired to the controller. (The sensor must be a 0 to 10V device representing 0 to 2000 PPM CO2.)

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Table 2. Configuration Options Summary For The W7753A Controller. (Continued) Option Possible Configurations Filter Monitor 1. None. Option 2. Local Dirty Filter Digital Input—directly wired to the controller. (Contacts closed means that the filter is dirty.) 3. Local Analog Input for Differential Pressure across the Filter (directly wired to the controller). The sensor must be a 2 to 10V device representing 0 to 5 inw (0 to 1.25 kPa). Shut Down 1. None. Option 2. Local Shut Down Digital Input—directly wired to the controller. (Contacts closed means to shut down the equipment.) Monitor Switch 1. None. Option 2. Local Monitor Switch Digital Input—directly wired to the controller. (Contacts closed means Monitor Switch is closed.) Coil Freeze Stat 1. None. Option 2. Local Coil Freeze Stat Digital Input—directly wired to the controller. (Contacts closed means that coil freeze condition is sensed.) Aqua Stat Make 1. None. On Temp Rise 2. Local AqStatMakeTmpRise Digital Input—directly wired to the controller. (Contacts closed means Option cooling mode, contact open means heating mode.) Aqua Stat Break 1. None. On Temp Rise 2. Local AqStatBrkTmpRise Digital Input—directly wired to the controller. (Contacts closed means Heating Option mode, contact open means cooling mode.) TimeClk Option 1. None. 2. Local TimeClk Digital Input—directly wired to the controller. (Contacts closed means Scheduled Occ mode.) 3. Network (OccSchedule signal received via the LONWORKS® Bus). Drip Pan Full 1. None. 2. Local DripPanFull Digital Input—directly wired to the controller. (Contacts closed means that Drip Pan is Full.) EconEnable 1. None. Option 2. Local EconEnable Digital Input—directly wired to the controller. (Contacts closed means Outside air is suitable for Cooling.)

Allowable Heating and Cooling Equipment COOL HEAT Configurations COIL COIL Each W7753A can control a variety of different types of mechanical cooling and heating equipment within the Unit MIXED DISCHARGE FAN Ventilator. See Fig. 5 through 8 for a conceptual overview of AIR AIR + some typical configurations. For specific wiring details, see - Installation Instructions (form no. 95-7521). FAN STARTER STAGED HEATING/COOLING CONTROL T7770 Staged equipment control is available for up to two stages of heating or two stages of cooling. On the W7753A, the stages Y1 Y2 are activated through digital outputs (Triacs) one for each GAS COMBUSTION stage, wired to 24 Vac contactors (see Installation Instructions CONTROLS for wiring details). Note that the number of physical digital W1 W2 outputs (DOs) on the controller limits the total number of stages that can be controlled. For example, the W7753A has eight digital outputs. If you are controlling a Unit Ventilator that has a three speed fan, three digital outputs would be required EXCEL 10 to control the speed. You also have an economizer that is W7753A floating control (Series 60 – requires 2 digital outputs). You UNIT have used five of the eight possible digital outputs and only VENTILATOR have three digital outputs left for the heating and cooling control. Fig. 5 shows a typical application of two stages of T7770 heat and two stages of cooling.

M24152 Fig. 5. Fan with two stages of heating and two stages of cooling.

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MODULATING HEATING/COOLING CONTROL COOL HEAT The W7753A Controller provides modulating equipment COIL COIL control for heating and cooling equipment, and economizer dampers using either Series 60 Floating Control or Pulse MIXED DISCHARGE Width Modulated (PWM) Control. The Series 60 Modulating FAN AIR AIR Control is provided through two Triac digital outputs on the - + W7753A, one to pulse the valve actuator open and one to pulse it closed. PWM control positions the actuator based on CHILLED HOT the length, in seconds, of the pulse from the digital output. For FAN WATER WATER PWM, the controller outputs a pulse whose length consists of STARTER VALVE VALVE two parts, a minimum and a maximum. The minimum pulse time represents the analog value of zero percent and the T7770 maximum pulse length that represents an analog value of 100 percent. If the analog value is greater than zero percent, an additional time is added to the minimum pulse time. The length of time added is directly proportional to the magnitude of the analog value. The PWM actuator will begin to use the EXCEL 10 W7753A analog value at the end of the pulse and will continue to use UNIT this value until a new pulse is received. Refer to appendix B VENTILATOR under PWM Control for an example. Series 60 actuators are generally less expensive than those for PWM, but the trade- T7770 off is that PWM requires only a single controller digital output while floating control uses two DOs. Refer to Appendix B under Series 60 Modulating Control for an example. Fig. 6 M24153 illustrates a system with modulating heating and cooling (see Fig. 6. Fan, modulating heating and modulating cooling. Installation Instructions for wiring details). NOTE: Pneumatically actuated valves can be controlled using a pneumatic transducer device. Also, transducer devices are available from third party vendors to convert PWM outputs to a voltage or current signal if desired. ECONOMIZER CONTROL There two types of economizer controls that are supported by the W7753A Controller, a modulating control and enable/disable control (packaged economizer separate from the W7753A). If a packaged economizer is configured, the control assumes that the first stage of cooling operates an economizer whenever the Econo_ok signal indicates that the economizer is enabled (outside air is suitable for use in cooling). An external packaged economizer control then modulates the dampers. For Modulating control, the control can be either Series 60 Floating Control or PWM control. A discharge air temperature sensor is required for modulating economizer damper control. Fig. 7 illustrates a system with modulating economizer dampers (see Installation Instructions form no. 95-7521 for wiring details).

COOL HEAT COIL COIL

OUTDOOR DISCHARGE FAN AIR AIR - +

M FAN STARTER PWM OR DISCHARGE SERIES 60 RETURN TEMPERATURE FLOATING AIR SENSOR REQUIRED MOTOR FOR ECONOMIZER CONTROL

EXCEL 10 W7753A T7770 UNIT VENTILATOR

T7770

M24155 Fig. 7. Economizer control.

74-2964—2 14 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

PNEUMATIC ACTUATOR CONTROL (see following NOTE) closure to indicate whether or not The W7753A Controller can control pneumatic actuators for people are present in the space. The Excel 10 W7753A any or all of the three modulating outputs provided by the Controller expects a contact closure to indicate the space is control algorithm (heat, cool and economizer). Control of Occupied. See Installation Instructions (form no. 95-7521) for pneumatic water/steam valves and damper actuators is details on wiring connections. provided through a transducer device using either Series 60 Floating Control or PWM DOs. A floating-to-pneumatic, or a The control algorithm in the Excel 10 Controller uses the PWM-to-pneumatic transducer is required for each output occupancy sensor, if configured, to determine the Effective signal. Occupancy (see Table 3) mode of operation. If the Time Of Day (TOD) schedule indicates an Occupied state, and the For projects with existing pneumatically actuated valves, the occupancy sensor contact is closed, the Effective Occupancy W7753A Controller output must be converted to a pneumatic mode is Occupied. However, if the TOD schedule indicates an signal using a transducer device developed for use with Excel Occupied state and the occupancy sensor contact is open, 10 Controllers. The transducer is available through then the Effective Occupancy mode is STANDBY. The Honeywell. temperature control algorithm is then controlled to the STANDBY Cooling and Heating Setpoints. Fig. 8 depicts a typical W7753A Controller with modulating heating valve using a pneumatic valve actuator. See If the occupancy sensor is not configured, a local controller Installation Instructions (form no. 95-7521) for wiring an can be put in the STANDBY mode only by either a one-to-one RP7517B Pneumatic Transducer to a W7753A Controller. association of the occupancy sensor from another Excel 10 Controller to the local controller, or by receiving the STANDBY NOTE: When choosing the pneumatic pressure range, make mode signal via the LONWORKS® Bus. sure that the close-off pressure is 2 to 3 psi greater than that of the spring range. When using a spring NOTE: The Excel 10 Controller has limited power available range of 5 to 10 psi with 10 psi as the closed (only 9 mA at 4.8 volts) for checking the digital inputs position, do not use the 0 to 10 psi model; use only for contact closures. It is very important that the the 0 to 20 psi transducer as the recommended device used contains high quality, noncorroding con- selection. tacts with resistivity that does not degrade; that is, increase over time. Use noble metal (such as gold or silver), or pimpled or sealed contacts to assure con- HEAT sistent, long-term operation. COIL Window Open/Closed Digital Input MIXED DISCHARGE FAN A digital input is also provided for detecting whether a window AIR AIR + in the space was opened. The Excel 10 W7753A Controller can be connected to a dry contact (see the following NOTE PNEUMATIC and Installation Instructions) or a set of contacts wired in FAN ACTUATOR STARTER VALVE series (for monitoring multiple windows) to verify that the window(s) are closed. The algorithm expects a contact closure to indicate the window is closed. If an open window is detected, the algorithm changes the mode of operation to FREEZE_PROTECT, which shuts down the control functions, T7770 EXCEL 10 and watches for low space temperature conditions. The freeze W7753A 1 T7770 protection setpoint is 46.4°F (8°C), and the frost alarm occurs UNIT M VENTILATOR at 42.8°F (6°C).

RP7517B PNEUMATIC NOTE: (This is the same NOTE as in the Occupancy Sensor TRANSDUCER section.) The Excel 10 has limited power available (only 9 mA at 4.8 volts) for checking the digital inputs 1 PNEUMATIC MAIN OR BRANCH LINE MUST BE 1/4 IN. (6 MM) OR LARGER TUBING. A MINIMUM OF 6 FT (1.8M) OF TUBING for contact closures. It is very important that the IS NEEDED IN A BRANCH LINE. device used contains high quality, noncorroding con- M24154 tacts with resistivity that does not degrade; that is, increase over time. Use noble metal (such as gold or Fig. 8. Modulating heat with pneumatic valve actuator. silver), or pimpled or sealed contacts to assure con- sistent, long-term operation. MIXED-OUTPUT-TYPE CONTROL The W7753A Controller provides control for mixed-output type of applications such as PWM heating and staged cooling Wall Module Options control occurring simultaneously with Series 60 Floating As previously discussed, there are seven basic varieties of the Economizer Damper Control. T7770 Wall Modules (see the Product Names and the Construction sections). Also, T7770 Wall Modules can be Occupancy Sensor shared among two or more W7753As. The control algorithm must be given this wall module information when configuring Excel 10 W7753A Controllers provide a digital input for the W7753A (see Excel LONSPEC™ User’s Guide, form no. connection to an occupancy sensor. This is a device, such as 74-2588). a passive infrared motion detector, that contains a dry contact

15 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Fan Speed Switch Indoor Air Quality (IAQ) Override The W7753A allows control of the units fan speed through a The Excel 10 W7753A Controller provides IAQ ventilation T7770 wall modules fan speed switch. It can be wired to either control using one of two different methods of detecting poor resistive input 1 or 2 and will indicate either a single or three air quality. The first is with an IAQ switch device connected to speed auto/off/on. a digital input on the W7753A Controller, where a contact closure indicates poor air quality, and initiates the IAQ Mixed Air Temperature Override mode. The device can detect poor air quality using any desired measure such as CO2, VOC, CO, etc. The The Excel 10 W7753A Controller supports a mixed air second method is through an analog input that connects to a temperature sensor for control of an economizer in the Cycle CO2 sensor (0 to 10V). The measured value of CO2 from this III operation. For Cycles I and II, the mixed air temperature sensor (0 to 2000 PPM) is compared to the setpoint sensor can be used for monitoring only. The details of the (IAQSetpt). When the CO2 level is higher than the setpoint, W7753A Mixed Air economizer control operation are the IAQ Override is initiated. described in Appendix B—Sequences of Operation under the “Cycle III Damper Control – Variable Outdoor Air Maintaining The effect of initiating the IAQ Override mode is that the Constant Mixed Air Temperature” on page 41. economizer dampers are allowed to open above the standard minimum position setting to allow more fresh air to enter the Outdoor Air Quality CO building. See Appendix B—Sequences of Operation, for The Excel 10 W7753A Controller provides an input for an further control details. Outdoor Air Quality sensor like the C7232 or C7632 CO2 sensor. The Unit Ventilator will measure the outdoor air quality Freeze Stat of the outside air entering the Unit Ventilator in order to close A freeze stat can be monitored by the W7753A and issue a outdoor dampers when the CO levels exceed the setpoint. freeze stat alarm indicating the unit ventilator is in danger of The details of the W7753A Mixed Air economizer control freezing its coil. Upon receiving a contact closure, the operation are described in Appendix B—Sequences of W7753A control algorithm will close the outdoor air damper Operation. and open the hot water valve (if available) to the full open as a safety precaution. The details of the W7753A freeze stat Dirty Filter Monitor related control operation are described in Appendix B— The in the Unit Ventilator can be monitored by the Sequences of Operation. W7753A and an alarm issued when the filter media needs replacement. The two methods of monitoring the filter are: AquaStat 1. Connecting a differential pressure switch to a digital An Aquastat can be monitored by the W7753A for Heat/Cool input. changeover. The aquastat can be either contacts-closed-on- 2. Wiring a 2-to-10V differential pressure sensor to a volt- temp-rise or contacts-close-on-temp-fall. The digital input age input. If the analog input sensor is used, its mea- must be configured for the appropriate device. The Aquastat sured value 0 to 5 inw (0 to 1.25 kPa) is compared to a will not change the Heat/Cool mode of the controller, only lock user-selectable setpoint, FltrPressStPt—valid range: 0 out or enable the cooling coil. The details of the W7753A to 5 inw (0 to 1.25 kPa), and the Dirty Filter alarm is AquaStat related control operation are described in Appendix issued when the pressure drop across the filter exceeds B—Sequences of Operation. the setpoint.

Drip Pan Full Smoke Control The Excel 10 W7753A Controller supports smoke-related The drip pan in the Unit Ventilator can be monitored by the control strategies that are initiated either via a network W7753A and an alarm issued when there is a drip pan full command (DestEmerg) or from a local (physically connected) condition. The W7753A expects a contact closure to indicate smoke detector digital input. The details of the W7753A a drip pan full condition. The W7753A will disable the cooling smoke-related control operation are described in Appendix upon the contact closure, but will continue to run the fan. B—Sequences of Operation.

Modes of Operation The possible modes of operation for the W7753A Controller are listed in Table 3.

74-2964—2 16 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Table 3. Modes Of Operation For The Excel 10 W7753A Controller. Mode Description Events causing a controller to switch to this mode Effective Occupancy (User Address: StatusOcc) OCCUPIED Controller is in Occupied Any of the following: Network input (StatusSched) containing a time-of-day mode schedule flag from another LONWORKS® Bus Controller; Time Clock DI, Occupancy Sensor DI; or from Network input (ManMode) for manual override to OCC mode. ManMode has the highest priority, followed by the Time Clock DI, and then StatusSched. STANDBY Controller is in Standby Either: (a) Network input (StatusSched) containing a time-of-day schedule mode flag from another LONWORKS® Bus node is STANDBY, or (b) Network input (StatusSched) is OCCUPIED and the Occupancy Sensor DI is UNOCCUPIED. UNOCCUPIED Controller is in Unoccupied Network input (StatusSched) containing a time-of-day schedule flag from the mode another LONWORKS® Bus device, or the network input CmdManOcc has a value of UNOCCUPIED. BYPASS Controller is in Occupied This mode is derived from the schedule occupancy (StatusSched) having a OCCUPIED mode through a Bypass state of UNOCCUPIED and a manual request for occupancy from one of command three sources. Two of these are signals originated external to the unit, and received by CmdManualOcc and DestBypass. The third source for an occupancy request is from an override button located on a wall module. These three sources are arbitrated in a scheme determined by the configuration parameter (Network Wins or Last-in Wins from OvrdPriority). Override Modes (User Address: StatusOvrd) OCCUPIED Controller occupancy mode Network input (CmdManualOcc) containing a time-of-day schedule override was overridden to Occupied signal of OCCUPIED from another LONWORKS® Bus device. mode STANDBY Controller occupancy mode Network input (CmdManualOcc) containing a time-of-day schedule override was overridden to Standby signal of STANDBY from another LONWORKS® Bus device. mode UNOCCUPIED Controller occupancy mode Network input (CmdManualOcc) containing a time-of-day schedule override was overridden to signal of UNOCCUPIED from another LONWORKS® Bus device. Unoccupied mode BYPASS Controller occupancy mode DI (Bypass) was pressed, and the Bypass duration timer has not yet expired, was overridden to Bypass or the network input CmdManOcc has a value of BYPASS. the current Unoccupied mode NOT ASSIGNED No Bypass action No Override input received. Operational Modes (User Address: StatusMode) START-UP AND On power-up, provides a This mode occurs on controller power-up, and after downloading to the WAIT staggered start sequence to controller from the configuration tool. Temperature control loops are evenly apply the load to the disabled. electrical system. COOLING The Excel 10 is controlling Space temperature has risen above the current cooling setpoint, or the the Cooling mode. network input (CmdHvacMode) is COOL. HEATING The Excel 10 is controlling Space temperature has fallen below the current heating setpoint, or the the Heating mode. network input (CmdHvacMode) is HEAT. EMERGENCY Compressors are disabled The network input (CmdHvacMode) is EMERG_HEAT. HEAT and only Auxiliary Heat stages are allowed to operate. OFF MODE The heat/cool control is Network input (CmdMode) containing AHU operational mode information turned off immediately. The from C-Bus has value of MORNING WARM-UP. node is not running its normal temperature control.

17 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Table 3. Modes Of Operation For The Excel 10 W7753A Controller. (Continued) Mode Description Events causing a controller to switch to this mode DISABLED MODE The heat/cool control and — frost protection are turned off immediately. The node is not running its normal temperature control. SMOKE The node has entered a smoke emergency. The fan and dampers are then EMERGENCY set to the conditions configured by SmkCtlMode. The control remains in SMOKE_EMERGENCY until power is cycled or the node receives DestEmerg set to EMERG_NORMAL. FREEZE PROTECT The temperature control is The Window digital input detects an open window. set to HEAT with the setpoint set to the frost limit setpoint 46.4°F (8°C). MANUAL The physical outputs are Typically this is done by the user through LONSPEC™ by setting the point POSITION being controlled manually. CmdMode to MANUAL mode. The temperature control loop is turned off. FAN ONLY Control algorithm is The space temperature sensor has failed, or the network input disabled, except that the fan (CmdHvacMode) is FAN ONLY. is turned on. DISABLED Control algorithm is shut off. Network input (ManMode) containing AHU operational mode information from C-Bus has value of DISABLED.

NOTE: During all modes all digital and analog physical Define the control requirements of the Unit Vent application inputs are periodically read, the diagnostic output such as how the fan is to operate, number of stages of heating network variables can be polled, the input network and cooling stages and how controlled, economizer control, variables are received, and the output network vari- indoor air quality IAQ control, and any other operational ables are sent periodically. characteristic that will need to be configured in the W7753 controller. APPLICATION PROCESS Usually there are variables that must be passed between the W7753 and other controllers, or central plant controller(s) that are required for optimum system-wide operation. Typical Overview examples are the TOD Occ/Unocc signal, the outdoor air temperature, demand limit control signal, and smoke control The four application steps shown in Table 4 are planning mode signal. considerations for engineering an Excel 10 W7753A System. These steps are guidelines intended to aid understanding of It is important to understand these interrelationships early in the product I/O options, configuration options and the Excel the job engineering process to ensure implementation when 10 W7753A Controller role in the overall Light Commercial configuring the controllers. (Refer to the LONSPEC Users Building Solution (LCBS) architecture. Guide form 74-2937 or E-Vision Users Guide form 74-2588 for information on the various Excel 10 Controller parameters and Table 4. Application Process. on Excel 10 Controller point mapping.) Step No. Description 1 Define the control application Step 2. Create Bill of Materials 2 Create Bill of Materials Once you know what equipment needs to be controlled, and 3 Configure Controllers where you want to install temperature and monitoring sensors, you can create a bill of materials for the controllers and 4 Controller Checkout accessories that the system requires. Refer to Table 5 for ordering information. Contact Honeywell for information about Step 1. Define the Control Application Controllers and Wall Modules with no logo. The application engineer must review the Direct Digital Control (DDC) job requirements. This includes the Sequences of Operation for the W7753 Unit Vent units, and for the system as a whole.

74-2964—2 18 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Table 5. Excel 10 W7750 Controller Ordering Information. Part Number Product Description Comments Excel 10 W7750 Controllers: W7750A2005 Constant Volume AHU Controller (W7750A) Three Analog Inputs, Three Digital Inputs and Six 24 Vac Relay Outputs W7750B2011 Constant Volume AHU Controller (W7750B) Six Analog Inputs, Five Digital Inputs and Eight (High-side Low-side switchable)Triac Outputs W7750C2001 Constant Volume AHU Controller (W7750C) Six Analog Inputs, Five Digital Inputs, Five Triac Outputs and Three Analog Outputs Echelon Based Components and Parts: Q7750A2003 Excel 10 Zone Manager Free Topology Tranceiver (FTT) Q7751A2002 Router (FTT) Q7751B2000 Router Twisted Pair Tranceiver (78 kbps) to FTT Q7752A2001 Serial Interface (FTT) Q7752A2009 Serial Interface (PCMCIA card) (FTT) Q7740A1008 Excel 10 2-Way Repeater Used to extend the length of the LONWORKS Bus. Contains built in termination modules. Q7740B1006 Excel 10 4-Way Repeater Used to extend the length of the LONWORKS Bus. Contains built in termination modules. XD 505A Standard C-Bus Communications Submodule — XD 508 C-Bus Communications Submodule (1 megabit — baud rate) 209541B Termination Module One/two required per LONWORKS Bus segment 205979 Operator Terminal Cable for LONWORKS Bus Serial interface to wall module or controller T7770 and T7560 Wall Modules: T7770A1006 Sensor with Honeywell Logo Used with Excel 5000 and Excel 10 Controllers T7770A2004 Sensor, LONWORKS Jack and Honeywell Logo Used with Excel 5000 and Excel 10 Controllers T7770B1004 Sensor with Setpoint and LONWORKS Jack, Degrees F Absolute Honeywell Logo T7770B1046 Sensor with Setpoint and LONWORKS Jack, Relative Setpoint Honeywell Logo T7770B1020 Sensor with Setpoint and LONWORKS Jack, Degrees C Absolute Honeywell Logo T7770C1002 Sensor with Setpoint, Bypass/LED and LONWORKS Degrees F Absolute Jack, Honeywell Logo T7770C1044 Sensor with Setpoint, Bypass/LED and LONWORKS Relative Setpoint Jack, Honeywell Logo T7770C1010 Sensor with Setpoint, Bypass/LED and LONWORKS Degrees F Absolute Jack, No Logo T7770C1028 Sensor with Setpoint, Bypass/LED and LONWORKS Degrees C Absolute Jack, Honeywell Logo T7770C1051 Sensor with Setpoint, Bypass/LED and LONWORKS Relative Setpoint Jack, No Logo T7770D1000 Sensor with Bypass/LED and LONWORKS Jack, Degrees F Absolute Honeywell Logo T7560A1018 Digital Wall Module with Sensor, Setpoint and Bypass/LCD, Honeywell Logo T7560A1042 Digital Wall Module with Sensor, Setpoint and All White Bypass/LCD, Honeywell Logo T7560B1016 Digital Wall Module with Sensor, Setpoint, Bypass/ LCD and Humidity, Honeywell Logo

19 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Table 5. Excel 10 W7750 Controller Ordering Information. (Continued) Part Number Product Description Comments T7560B1032 Digital Wall Module with Sensor, Setpoint, Bypass/ All White LCD and Humidity, Honeywell Logo Temperature Sensors (Various Applications): C7041C2003 Duct Discharge/Return Air Sensor. 20K ohm 18 in. (457mm) insertion length. C7041D2001 Hot or Temperature Sensor. 20K ohm Use 50001774-001 Immersion Well NTC C7041F2006 Outside Air Temperature Sensor. 20K ohm NTC W7750B,C only C7041J2007 Averaging Discharge/Return Air Temperature Duct element cord length 12 ft. (3.7m). Sensor. 20K ohm NTC C7041B2005 Discharge/Return Air Temperature Sensor. 20K Element length 6 in. (152 mm). ohm NTC C7041B2013 Discharge/Return Air Temperature Sensor. 20K Element length 12 in. (305 mm). ohm NTC C7041K2005 Hot or chilled Water Temperature Sensor. 20K ohm Strap-on NTC C7100A1015 Averaging Discharge/Return Air Temperature 13 in. (330mm) insertion length. Sensor. PT3000 C7031G2014 Outdoor Air Temperature Sensor. PT3000 Weatherproof, 1/2 in. conduit knockout. C7170A1002 Outdoor Air Temperature Sensor. PT3000 — C7770A1006 Air Temperature Sensor. 20K ohm NTC Duct-mounted sensor that functions as a nonlinearized primary and/or secondary sensor.

Sensors (CO2, Humidity, Enthalpy, and Pressure):

C7232A1008 CO2 Wall Mount Sensor/Monitor with display Use to measure the levels of carbon dioxide

C7232A1016 CO2 Wall Mount Sensor/Monitor without display Use to measure the levels of carbon dioxide

C7232B1006 CO2 Duct Mount Sensor/Monitor with display Use to measure the levels of carbon dioxide

C7232B1014 CO2 Duct Mount Sensor/Monitor without display Use to measure the levels of carbon dioxide C7400A1004 Solid State Enthalpy Sensor (4 to 20 mA) For outdoor and return air enthalpy C7600B2008 Solid State Humidity Sensor (2 to 10 Vdc) For wall mount air humidity C7600C1008 Solid State Humidity Sensor (4 to 20 mA) For outdoor and return air humidity C7632A1004 Solid State Humidity Sensor without display For wall mount air humidity C7632B1002 Solid State Humidity Sensor without display For duct mount air humidity H7625A, H7635A Solid State Humidity Sensor, wall mount Includes a 20K ohm temperature sensor H7655A Solid State Humidity Sensor, wall mount H7625B, H7635B, Solid State Humidity Sensor, duct mount Includes a 20K ohm temperature sensor H7655B H7635C Solid State Humidity Sensor, outdoor mount Includes a 20K ohm temperature sensor P7640A,B Pressure Sensor (4 to 20 mA), use 500 ohm resistor Set for 0 to 5 in. w.c. Accessories: ML7984B3000 Valve Actuator Pulse Width Modulation (PWM) Use with V5011 or V5013 F and G Valves ML6161B1000 Damper Actuator Series 60 — M6410A Valve Actuator Series 60 Use with V5852/V5853/V5862/V5863 Valves ML684A1025 Versadrive Valve Actuator with linkage, Series 60 Use with V5011 and V5013 Valves ML6464A1009 Direct Coupled Actuator, 66 lb-in. torque, Series 60 — ML6474A1008 Direct Coupled Actuator, 132 lb-in. torque, Series 60 — ML6185A1000 Direct Coupled Actuator, 50 lb-in. spring return Series 60

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Table 5. Excel 10 W7750 Controller Ordering Information. (Continued) Part Number Product Description Comments V5852A/V5862A Two-way terminal unit water valve; 0.19, 0.29, 0.47, Use with M6410 Valve Actuator. Close-off rating 0.74, 1.2, and 1.9 Cv 1/2 in. npt (13 mm) or 2.9 and for 0.19 to 1.9 Cv is 65 psi; for 2.9 and 4.9, Cv is 4.9 Cv 3/4 in. npt (19 mm) 45 psi. (Coefficient of volume or capacity index Cv = gallons per minute divided by the square root of the pressure drop across the valve.) V5853A/V5863A Three-way mixing terminal unit hot water valve; Use with M6410 Valve Actuator. Close-off rating 0.19, 0.29, 0.47, 0.74, 1.2, and 1.9 Cv 1/2 in. npt (13 for 0.19 to 0.74 Cv is 55 psi; 1.2 and 1.9 Cv is 22 mm) or 2.9 and 4.9 Cv 3/4 in. npt (19 mm) psi; 2.9 and 4.9 Cv is 26 psi. R8242A Contactor, 24 Vac coil, DPDT — AT72D, AT88A, AK3310, Transformers — etc. EN 50 022 DIN rail 35 mm by 7.5 mm (1-3/8 in. by 5/16 in.) Obtain locally: Each controller requires 5 in. — Two DIN rail adapters Obtain locally: Part number TKAD, from Thomas and Betts, two for each controller. Cabling: — Serial Interface Cable, male DB-9 to female DB-9 or Obtain locally from any computer hardware female DB-25. vendor. Honeywell AK3791 (one LONWORKS Bus (plenum): 22 AWG (0.34 mm2) Level IV 140°F (60°C) rating twisted pair) AK3792 twisted pair solid conductor, nonshielded or Echelon (two twisted pairs) approved cable. Honeywell AK3781 (one LONWORKS Bus (nonplenum): 22 AWG (0.34 mm2) Level IV 140°F (60°C) rating twisted pair) AK3782 twisted pair solid conductor, nonshielded or Echelon (two twisted pairs) approved cable. Honeywell AK3725 Inputs: 18 AWG (1.0 mm2) five wire cable bundle Standard wire Honeywell AK3752 Outputs/Power: 14 to 18 AWG (2.0 to 1.0 mm2) NEC Class 2 140°F (60°C) rating (typical or equivalent) Honeywell AK3702 18 AWG (1.0 mm2) twisted pair Non-plenum (typical or equivalent) Honeywell AK3712 16 AWG (1.3 mm2) twisted pair Non-plenum (typical or equivalent) Honeywell AK3754 14 AWG (2.0 mm2) two conductor Non-plenum (typical or equivalent)

Step 3. Configure Controllers W7753A Controllers are shipped from the factory with a equipment and wiring match the default setup), and given default hardware configuration. On power-up, the controller valid sensor inputs, the outputs are controlled appropriately to configuration parameters are set to the default values, and the maintain space temperature at the default setpoint. A default I/O arrangement for the W7753A is printed on the complete description of the sequences of operation is in terminal labels. The labeled I/O terminals are defined in Table Appendix B. 6. The controller can operate normally in this mode (if the

Table 6. W7753A Version I/O Description. Terminal Terminal Number Description DO8 16 Digital output 8 DO7 17 Digital output 7 DO6 18 Digital output 6 DO5 19 Digital output 5 DO4 20 Digital output 4 DO3 21 Digital output 3 DO2 22 Digital output 2 DO1 23 Digital output 1

21 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Table 6. W7753A Version I/O Description. (Continued) Terminal Terminal Number Description COM (N) 24 Return for power to controller +24Vac (H) 25 Power for the controller DI-1 26 Digital Input 1 DGND 27 Digital Ground DI-2 28 Digital Input 2 DI-3 29 Digital Input 3 DGND 30 Digital Ground DI-4 31 Digital Input 4 LONWORKS® Bus 14 and 15 Echelon communications (LONWORKS® Bus) screw terminals 22VDC OUT 13 22 VDC source for Voltage/Current sensor (Max 50mA) AI-4 V/mA 12 Analog Input 4 (Voltage or Current) AGND 11 Analog ground AI-3 V/mA 10 Analog Input 3 (Voltage or Current) AI-2 9 Analog Input 2 (Resistive) AGND 8 Analog ground AI-1 7 Analog Input 1 (Resistive) SETPT 6 Space temperature setpoint pot GROUND 5 Wall Module SENSOR 4 Space temperature sensor BYPASS 3 Space override button LED 2 Space LED for indication of manual occupancy status EARTH GND 1 Earth Ground

Using LONSPEC™ The configuration process is primarily performed in a series of screens seen as file tabs under the menu option Application LONSPEC™ PC Software is used to configure W7750 Controllers to match their intended application. The Selection and is easily followed using the tables included in this section. There are 9 file tabs: LONSPEC™ User’s Guide form, 74-2588 provides details for 1. Output operating the PC software. Refer to the LONSPEC™ User’s Guide form, 74-2588 for application selections and steps to 2. Input configure the Unit Vent controllers. 3. Zone Options 4. Custom Wiring The process of configuring Excel 10 Unit Vent Controllers 5. PID involves giving the Controller information. There are three 6. Economizer general categories of information: 7. Equipment Control 1. Hardware I/O Assignment 8. H/C Stages The Excel 10 Controller must be informed about the 9. Miscellaneous physical equipment wired to its terminals. 2. Personality Information The specific parameters to be configured in each of these Each controller must be given information about its par- categories are tabulated in the following subsections. ticular and the zone it serves. Examples are the Space Temperature Setpoints for each mode (Occu- NOTE: To set the following configuration parameters, use pied Cool, Occupied Heat, Standby Cool, etc.), Econo- the ZL7760A LONSPEC™ PC tool. These sections mizer Enable setpoints if applicable, and equipment and describe the various parameters and the allowable fan control selections. settings. For details on using LONSPEC™, refer to the 3. ID Number LONSPEC™ User Guide. Each Excel 10 Controller must be assigned the Identifi- cation Number that gives the device a specific identity Configuration screen for UV Controllers on the bus. This is required for proper network commu- nications. TAB: OUTPUT: The available options for output configurations are listed in The specific parameters to be configured in each of these Table 7 with the default values shown. three categories are discussed in the following subsections. >> Fan Speeds: Selects number of fan stages to be controlled.

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>> Heating: Selects type of heating. Options include one or >> Optional Digital Inputs: Select from a list. See complete list two stages, Floating or Pwm for modulating applications, or of options in Inputs/Outputs section of this document. none. >> Optional Analog Inputs: Select from list. Duplicates cannot >> Cooling: Selects type of cooling. Options include one or be selected—for example, only one Discharge Temperature two stages, Floating or Pwm for modulating applications, or sensor per controller. See complete list of options in Inputs/ none. Outputs section of this document.

>> Economizer: Selects how the outdoor air dampers are to be controlled. Options include none, or a packaged Table 8. Input Configuration for UV. economizer, Floating or Pwm for modulating applications. Function Configuration Options Default >> Motor Speed: Enabled if Floating motor selected for Space Temp Wall Module Wall Module Heating, Cooling, or Economizer. Configures the time it takes LCD Wall Module for a floating motor to go from full closed to full open. Network only Optional Digital OccSensor Unused DI >> PWM Settings: Enabled if PWM motor selected for Inputs TimeClock Heating, Cooling, and/or Economizer. These settings are ProofAirFlow universal, meaning if more than one output is configured to be EconEnable PWM, they need to have the same style of PWM signal. IaqOverrideIn SmokeMonitor DirtyFilterIn Table 7. Output Configuration for UV. ShutDown Function Configuration options Default WindowOpen Monitor Fan Speeds FanSpeed1 FanSpeed1 CoilFreezeStat FanSpeed2 AqStatMakeTmpRise FanSpeed3 AqStatBreakTmpRise NoFan DripPanFullIn Heating HeatingStage1 HeatingStage2 Unused DI HeatingStage2 Digital Inputs: HeatingPwmOut Resistive OutdoorTempPt3000 Unused RAI HeatingFloating DischargeTempPt3000 NoHeating ReturnTempPt3000 Cooling CoolingStage1 CoolingStage2 MixedAirTempPt3000 CoolingStage2 FanSwitch CoolingPwmOut DischargeTemp20kntc CoolingFloating ReturnTemp20kntc NoCooling MixedAirTemp20kntc Economizer EconNonePkgd EconNone Unused RAI EconPwmOut Voltage/Current RtnHum C7600c Unused VAI EconoFloating ReturnEnthalpy Optional Points OccupancyStatus Unused OdHum C7600c AuxEcon OutdoorEnthalpy Free1 FilterStaticPressDiff Unused SpaceCo2 MonitorSensor1 Motor Speed Heating 90 sec. RtnHum C7600b Cooling OdHum C7600b Economizer Unused VAI PWM Settings Period 25.6 sec. Zero Scale 0.1 sec. TAB: ZONE OPTIONS Full Scale 25.5 sec. >> Setpoints: Range is 50 - 95°F Heating Unoccupied <= Heating Standby Setpoint <= Heating Occupied <= Cooling TAB: INPUT Occupied <= Cooling Standby <= Cooling Unoccupied. The available options for input configurations with default values shown are listed in Table 8. >> Min. Limit Setpoint: Limits range of remote setpoint. Available options are -9 to 9 for relative setpoint adjust; and >> Space Temp: This is the control sensor, so it MUST be 50 - 95°F for absolute. configured. Options are: Wall Module, LCD Wall Module, or network only. >> Max. Limit Setpoint: Limits range of remote setpoint. Available options are -9 to 9 for relative setpoint adjust; and NOTE: If you select network only, you must share space 50 - 90°F for absolute. temperature to the device in “Refer Points” for it to operate.

23 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

>> Enable Type: See “Economizer Enable/Disable Control Table 9. Zone Options Configuration for UV. (pertains to ASHRAE Cycle II and III)” on page 42 for a complete description of Economizer Enable options. Software Function Configuration Options Default will check to make sure that the Economizer output and the Cooling Occupied corresponding enable input point(s) is (are) configured in the Setpoint 50 - 95 Deg. F 73.4 DF Inputs section. Remember, if the outdoor air temperature is to Cooling Standby be shared to the controller, that must be set up in the “Refer Setpoint 50 - 95 Deg. F 77 DF Points” section. Cooling UnOccupied >> OA Damper Min Pos: Position (%) that a modulating Setpoint 50 - 95 Deg. F 82.4 DF economizer will be set to during occupied mode for ventilation Heating Occupied requirements. Available for ASHRAE Cycle II only. Setpoint 50 - 95 Deg. F 69.8 DF >> IAQ Position: Position (%) for outdoor air dampers for poor Heating Standby IAQ conditions. Setpoint 50 - 95 Deg. F 66.16 DF Heating UnOccupied >> Use Heat for IAQ: Enables/Disables Heat for IAQ Setpoint 50 - 95 Deg. F 60.8 DF conditions if the outdoor air is cool enough to cause the Min. Limit Setpoint Absolute: 50 - 95 DF discharge air temperature to fall below the Low Limit setpoint Relative: -9 to 9 DDF 55 DF >> Enable Setpoint: Available if DiffTemp or SingleEnthalpy is Max. Limit Setpoint Absolute: 50 - 95 DF selected for Enable Type. Engineering units are DDF or BTU/ Relative: -9 to 9 DDF 85 DF lb., respectively. Range is 0-90.

TAB: CUSTOM WIRING >> Oa Temp High Limit: Enabled if SingleEnthalpy is selected >> To change wiring, move loads from right side over to left for Enable Type. Puts a temperature limit in addition to the side. Return them on the right side to the correct location. enthalpy setpoint so that hot dry air is not brought into the space as first stage of cooling. TAB: PID NOTE: Refer to Appendix B for recommended values for >> Mixed Air Temp Setpoint: Enabled only when ASHRAE these parameters. Incorrect settings can cause equipment to Cycle III is selected in the Equipment Control Tab. Allows short cycle, and damage compressors. dampers to be controlled by the Mixed Air Temperature.

>> Cooling: Throttling range (2 - 30 DDF), Integral time (0- Table 11. Economizer Configuration for UV. 5,000 sec.), and derivative time (0 - 9,000 sec.) settings for Function Configuration Options Default system when in cooling mode. IAQ CO2 0-2000 PPM 800 PPM >> Heating: Throttling range (2 - 30 DDF), Integral time (0- Setpoint 5,000 sec.), and derivative time (0 - 9,000 sec.) settings for OAQ Sensor 0-2000 PPM 0 PPM system when in heating mode. Setpoint Table 10. PID Configuration for UV. Enable Type OdTemp EconNul DiffTemp Function Configuration Options Default SingleEnth Cooling: DigitalEn Throttling Range 2 - 30 DDF 5 OdEnthDType EconNul Integral Time 0 - 2050 sec. 2050 OdEnthBType Derivative Time 0 - 9000 sec. 0 OdEnthAType Heating: OdEnthCType Throttling Range 2 - 30 DDF 5 DiffEnth Integral Time 0 - 2050 sec. 2050 OA Damper Min Pos 0-100% 10% Derivative Time 0 - 9000 sec. 0 IAQ Position 0-100% 80% Control Bands Heating, Cooling, 5 - 30 DDF 20 Use Heat for Yes No Economizer IAQ No Enable Setpoint 0 - 90 DDF 4 DDF TAB: ECONOMIZER 0 - 90 BTU/Lb. 25 BTU/Lb. >> IAQ CO2 Setpoint: The point above which the IAQ is Oa Temp High 0 - 90 DF 70 DF deemed to be poor, and the IAQ override mode is enabled. Temp Range is 0 - 2000 ppm. Mixed Air Temp 40 - 80 DF 45 DF Setpoint OAQ Sensor Setpoint: This setting is compared to the actual Outdoor Air Quality CO or CO2 sensor. If outdoor air is deemed poor, the dampers are closed at 0%.

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TAB: EQUIPMENT CONTROL >> Min. On/Off: Enable or Disable Min. On/Off times for >> Cascade Control: Only available if discharge air sensor is Heating and Cooling. If Disabled, stages are on for 30 configured for the inputs, and modulating heating and / or seconds minimum. cooling are / is configured for the outputs. Heating and cooling valves are modulated to maintain a calculated discharge air >> Cycles / hr.: Determines how often equipment will run. It temperature setpoint based on space temperature deviation also determines Min. on and Min. off times, if enabled. See from the space setpoint. See “Cascade Control of Modulating Table 19 for Interstage Minimum times. Cooling/Heating” on page 40 for detailed description. >> Outdoor Air Temperature lockout: Outdoor air temperature >> Fan Control: Options are continuous during the occupied below which the cooling stages will not run, and above which mode, or intermittent (auto) with heating and cooling. the heating stages will be locked out. Separate setpoints for heating and cooling temperatures. >> Fan - Heating: Determines if the W7750 turns the fan on and off during heating, or if it is controlled at the equipment, as >> Ramp: Allows user to reconfigure recovery rate (in DDF / it often is in air handlers with gas-fired heat. hour) for transition from unoccupied to occupied.

>> Smoke Control: If the smoke detector is sensed, the >> Fan run-on time: Allows fan in intermittent mode to run options are Fan Off, Damper Closed; Fan On, Damper Open; longer than a call for heat / cool stages before shutting off. Fan On, Damper Closed.

>> Fan Fail Time: Time controller will wait for proof of air flow Table 13. H/C Stages Configuration for UV. switch activation after fan has been turned on before sending Defaults a fan failure alarm. Enabled if Air Flow switch is selected for Configuration digital input. Function Options Heating Cooling Min. On MinOn MinHeatOff MinCoolOff >> Filter Pressure Stpt: of pressure across air filter that will MinOff cause a Dirty filter alarm in controller. Enabled if air filter pressure sensor is selected as a voltage input. Cycles/Hour 2 - 12 6 3 Outdoor Air 0 - 90 Deg. F 70 DF 50 DF >> ASHRAE Cycle: Selects control strategy for the Temperature economizer while in occupied mode. Cycle 1 assumes 100% Lockout outdoor air. Cycle 2 has variable percentage of Outdoor Air Ramp 0 - 20 DDF/Hr. 8 DDF/Hr. 3 DDF/Hr. with a Minimum Position setting. Cycle 3 has variable percentage of Outdoor Air maintaining a constant mixed air Fan RunOn Time 0 - 255 sec. 0 sec. 0 sec. temperature. TAB: MISC >> DLC Setpoint Bump: Amount the setpoint will be raised in Table 12. Equipment Control Configuration for UV. cooling mode or lowered in heating mode when the controller has been put into DLC Shed mode. Function Configuration Options Default Cascade Yes No >> Wall Module Settings: Use Wall Module enables or Control No disables setpoint adjust; Override Type: Options are: Normal Fan Control AutoFan AutoFan (Bypass or Continuous Unoccupied options); Bypass only, or ContinuousFan none. Override Priority: determines which source point has priority in device - Network point or last change. See Appendix Fan - Heating On On B for details on how the Bypass function works. Off Smoke Control FanOffDmperClose FanOffDmper >> Bypass Time: Enabled when Bypass is selected. FanOnDmperClose Close Configures how long Bypass mode will last upon activation. FanOnDmperOpen Range: 0 to 1080 minutes. Fan Fail Time 0 - 127 sec. 10 sec. >> Max. DaTemp Setpoint: Maximum Discharge Temperature Filter Pressure allowed. Range is 65 - 135°F. Enabled if Discharge Stpt. 0 - 5 in. H2O 0.5 in. H20 Temperature sensor is configured. ASHRAE Cycle Cycle 1 Cycle 2 Cycle 2 >> Min. DaTemp Setpoint: Minimum Discharge Temperature Cycle 3 allowed. Range is 0 - 60°F. Enabled if Discharge Air Temperature sensor is configured. TAB: H/C STAGES >> Setpoint Default: Absolute Middle or Relative. Enabled if The default settings for the H/C Stages configuration setpoints Use Wall Module is Yes. are shown in Table 13. In all cases, heating and cooling stages are set up separately for better control.

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The T7770 Wall Module setpoint potentiometers have the Table 14. Miscellaneous Configuration for UV. following calibration points. Function Configuration Options Default Temperature (°F) Resistance Value (ohms) DLC Setpoint 0 - 10 DDF 3 DDF 85 1290 Bump 70 5500 Use Wall Module YesUse No 55 9846 NoUse Override Type Normal None Bypass only 80K None 70K Override Priority Net Last Last 60K Bypass Time 0 - 1080 min. 180 min. 50K

Max. DaTemp 40K Setpoint 65 - 135 Deg. F 100 Deg. F 30K Min. DaTemp (OHMS) RESISTANCE 20K OHM AT Setpoint 0 - 60 Deg. F 45 Deg. F 20K 77oF (25oC) Setpoint Default Absolute Middle Absolute 10K Relative Middle

30 40 50 60 70 80 90 100 110 oF Step 4. Controller Checkout 0 10 20 30 40 oC TEMPERATURE (DEGREES) AIR TEMPERATURE SENSOR

Troubleshooting Excel 10 Controllers and Wall 10K OHM SETPOINT POT M11620 Modules RESISTANCE VALUES In addition to the following information, refer to the Installation Fig. 9. Temperature sensor and setpoint potentiometer Instructions and Checkout and Test manual for each product. resistance plots. See the Applicable Literature section for form numbers. Alarms Temperature Sensor and Setpoint Potentiometer When an Excel 10 has an alarm condition, it reports it to the Resistance Ranges central node on the LONWORKS® Bus. See Table 15. The T7770 or the C7770A Air Temperature Sensor has the Information contained in an alarm message is: following specified calibration points, which are plotted in Fig. 9: • Subnet Number: LONWORKS® Bus subnet that contains the Excel 10 node Temperature (°F) Resistance Value (ohms) that has the alarm condition. Subnet 1 is on the Zone 98 11755 Manager side of the router; Subnet 2 is on the other side. • Node Number: 80 18478 Excel 10 node that has the alarm condition (see Network 70 24028 Status). • Alarm Type: 60 31525 Specific alarm being issued. An Excel 10 can provide the 42 52675 alarm types listed in Table 15.

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Table 15. Excel 10 Alarms. Alarm type Name of alarm or error bit number Meaning of alarm code or error bit RETURN_TO_NORMAL 128U Return to no alarm after being in an alarm condition. This code is added numerically to another alarm code to indicate that the alarm condition has returned to normal. AlarmNotifyDisabled 255U The alarm reporting was turned off by CmdMode. No more alarms are reported until CmdMode turns on alarm reporting or on application restart. NoAlarm 0 No alarms presently detected. CommFailAlrm 1 One or more NV inputs have failed in receiving an update within their specified FAILURE_DETECT_TIME. NodeDisableAlrm 2 The control algorithm has stopped because the controller is in DISABLED_MODE, MANUAL or FACTORY_TEST mode. No more alarms are reported when the controller is in the DISABLED_MODE. Alarms continue to be reported if the controller is in the MANUAL or FACTORY_TEST mode. SensorFailAlrm 3 One or more sensors have failed. FrostProtectAlrm 4 The space temperature is below the frost alarm limit 42.8°F (6°C) when the mode is FREEZE_PROTECT. The alarm condition remains until the temperature exceeds the alarm limit plus hysteresis. InvalidSetPtAlrm 5 One of the Setpoints is not in the valid range. LossAirFlowAlrm 6 The Fan Status DI indicates that there is no air flow when the node is commanding the fan to run. The control is shut down and disabled until power is cycled or the node is reset. See NOTE below. The alarm is not issued until FanFailTime seconds have elapsed since the loss-of-flow condition was first reported. DirtyFilterAlrm 7 The pressure drop across the filter exceeds the limit and the filter requires maintenance. The control runs normally. SmokeAlrm 8 The smoke detector has detected smoke and the node has entered an emergency state. IaqOverRideAlrm 9 The indoor air quality sensor has detected that the indoor air quality is poorer than the desired standard and additional outdoor air is being brought into the conditioned space. LowLimEconClose 10 The economizer has to close beyond the minimum position to prevent the discharge air temperature from going below the discharge temperature low limit. DripPanFullAlrm 11 The drip pan is full. The fan continues to run but the cooling is disabled. FreezeStatAlrm 12 The coil is about to freeze and the controller is taking action. OaQualityAlrm 13 The outdoor air quality is poor. If there is a working outdoor air quality sensor configured and CO or CO2 exceeds OaQStPt. There is 30 ppm hysteresis on this sensor. When there is an OaQualityAlrm, the economizer damper is closed.

NOTE: The node can be reset by switching the node to Also, the Excel 10 variables, AlarmLogX where X is 1 through MANUAL and then to the normal operating mode. 5, that store the last five alarms to occur in the controller, are available. These points can be viewed through LONSPEC™.

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Broadcasting the Service Message The commissioning tool is used to perform the ID Assignment task (see the LONSPEC™ User’s Guide, form 74-2588). The Service Message allows a device on the LONWORKS® Bus to be positively identified. The Service Message contains the controller ID number and, therefore, can be used to confirm the physical location of a particular Excel 10 in a SERVICE PIN building. BUTTON There are two methods of broadcasting the Service Message from an Excel 10 W7753A Controller. One uses a hardware service pin button on the side of the controller (see Fig. 10). The other involves using the PC Configuration tool, as follows.

When an Assign ID command is issued from the commissioning tool, the node goes into the SERVICE_MESSAGE mode for five minutes. In the SERVICE_MESSAGE mode, pressing the Occupancy Override button on the remote wall module (refer to Fig. 12 and 13 for override button location) causes the Service Message to be broadcast on the network. All other functions are normal in the SERVICE_MESSAGE mode. Even if an Excel 10 W7753A Controller does not have an Override button connected, it can broadcast the Service Message on the network by temporarily shorting the Controller Bypass M10094 Input terminal to the Sensor Ground terminal on the W7753A (short terminals 3 and 5). Fig. 10. Location of the Service Pin Button.

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W7753A Controller Status LED T7770C,D,E,F Wall Module Remote Override LED The LED on the front and center of a W7753A Controller The remote override LED, located on either the T7770C,D,E,F provides a visual indication of the status of the device. Wall Modules in Fig. 32, displays the Manual Override mode of the controller. The modes are: See Fig. 11. When the W7753A receives power, the LED 1. LED = Off. No override active. should appear in one of the following allowable states: 2. LED = Continuously on. Bypass mode (timed Occupied 1. Off—no power to the processor. override). 2. Continuously On—processor is in initialized state. 3. LED = One flash per second. Continuous Unoccupied 3. Slow Blink—controlling, normal state. override. 4. Fast Blink—when the Excel 10 has an alarm condition. 4. LED = Two flashes per second. Remote only, continu- ous Occupied override.

W7753A

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 D14 GN DD1 VAC 3 D12 G VAC ND D1 24 1 24 1 2 COM OU 3 4 T OUT 5 OUT OU 6 T OU 7 8 T OUT OUT OUT

E LED BY GN PAS S S D NSR GND SET PT A11 GND OHM A12 A13 OHM GND A1 V/mA 4 22VDC 12 V/mA E-BUS E-BU 3 OUT S 4 5678 JACK 9 10 11 12 13 14 15 J3

STATUS LED

M11954

Fig. 11. LED location on W7753A.

T7770C T7770D T7770E T7770F

65 65 70 70

60 60 75 OVERRIDE 75 OVERRIDE OVERRIDE 55 OVERRIDE 55 LED 80 LED LED 80 LED 85 BYPASS 85 BYPASS PUSHBUTTON auto 0 1 PUSHBUTTON auto 0 1 2 3

BYPASS BYPASS PUSHBUTTON PUSHBUTTON

M11955

Fig. 12. LED and Bypass pushbutton locations on T7770 Wall Modules.

29 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

APPENDICES Appendix A: Using LONSPEC™ to Commission a W7753A Controller Sensor Calibration Setting PID Parameters The space temperature, the optional resistive and voltage/ The W7753A is designed to control a wide variety of current inputs can all be calibrated. The wall module setpoint mechanical systems in many types of buildings. With this potentiometer can not be calibrated. Perform the sensor flexibility, it is necessary to verify the stability of the calibration by adding an offset value (either positive or temperature control in each different type of application. negative) to the sensed value using LONSPEC™ menus (see Occasionally, the PID parameters require tuning to optimize LONSPEC™ user guide, form number 74-2588). comfort and smooth equipment operation.

When calibrating voltage/current sensors on the W7753A, the The Excel 10 Unit Ventilator Controllers are configured by offset amount entered by the user is in volts, regardless of the LONSPEC™ with default values of PID parameters that are inputs actual engineering units. See Appendix C for based on the specific mechanical equipment controlled by the information on how to derive the proper voltage value to enter W7753A. These default values (see Table 16) are based on as an offset during calibration. past experience with the applications and in most cases do not require further adjustment.

Table 16. Default PID Parameters.

Default Values Provided by LONSPEC™ Heat Heat Heat Heat Cool Cool Cool Cool Econ Equipment Prop. Integ. Deriv. Control Prop. Integ. Deriv. Control Control Configuration Gain Gain Gain Band Gain Gain Gain Band Band Single Stage 230000023000000 Two Stages 320000032000000 Series 60 Modulating 2 750 0 15 2 750 0 15 15 (Floating) PWM Modulating 2 900 0 15 2 900 0 15 15 If the PID parameters require adjustment away from these control response. In other words, a decrease in Integral values, use caution to ensure that equipment problems do not Gain causes a more rapid response in the output signal. arise (see Important below). If any change to PID control —The Derivative Gain (also called Derivative Time) parameters is made, the adjustments should be gradual. After determines how much impact the error rate has on the each change, the system should be allowed to stabilize so the output signal. The error rate is how fast the error value is effects of the change can be accurately observed. Then changing. It can also be the direction the space further refinements can made, as needed, until the system is temperature is going, either toward or away from the operating as desired. setpoint, and its speed—quickly or slowly. A decrease in Derivative Gain causes a given error rate to have a larger IMPORTANT effect on the output signal. If large or frequent changes to PID control —The Control Band is used only for discharge temperature parameters are made, it is possible to cause control of modulating outputs, which includes controlling equipment problems such as short cycling the economizer dampers, and heating and cooling valves compressors (if the stage minimum run times were using Cascade Control. The Control Band dictates the disabled in User Addresses DisMinClTime or span through which the discharge temperature must travel DisMinHtTime). Other problems that can occur to cause the output signal to go from fully closed to fully include wide swings in space temperature and open. Also, 10 percent of the Control Band value is the size excessive overdriving of modulating outputs. of the deadband around the setpoint where no actuator motion occurs. For example, if controlling a cooling valve If adjustment of PID parameters is required, use the following. with Cascade Control enabled and with the discharge In the items below, the term, error, refers to the difference temperature within 0.1 X DaTempClCtrlBd of the discharge between the measured space temperature and the current setpoint, there is no change in the current valve position. actual space temperature setpoint: —The Proportional Gain (also called Throttling Range) NOTE: The smaller the Control Band, the more responsive determines how much impact the error will have on the the control output. A larger Control Band causes output signal. Decreasing the Proportional Gain amplifies more sluggish control. Be careful not to set the the effect of the error; that is, for a given error, a small Control Band too low and cause large over or under Proportional Gain causes a higher output signal value. shoots (hunting). This can happen if the space or discharge sensors or wiring are in noisy —The Integral Gain (also called Integral Time) determines environments and the value reported to the controller how much impact the error-over-time has on the output is not stable (such that it bounces). The Control Band signal. Error-over-time has two components making up its is used only in modulating control, and has no value: the amount of time the error exists; and the size of purpose when staged control is configured. the error. The higher the Integral Gain, the slower the

74-2964—2 30 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Appendix B: Sequences of Operation This Appendix provides the control sequences of operation for equipment arrangements. Table 17 (copied from Table 2) the Excel 10 W7753A UV Controller. The W7753A Controller summarizes the available options. This Appendix provides a can be configured to control a wide variety of possible more detailed discussion of these options.

Table 17. Configuration Options Summary For The W7753A. Option Possible Configurations Supply Fan 1. Mandatory Digital Output (Single or Three Speed). Type of Heating 1. One stage. 2. Two stages. 3. Series 60 Modulating electric valve, or pneumatic via transducer. 4. Pulse Width Modulating electric valve, or pneumatic via transducer. 5. None. Type of Cooling 1. One stage. 2. Two stages. 3. Series 60 Modulating electric valve, or pneumatic via transducer. 4. Pulse Width Modulating electric valve, or pneumatic via transducer. 5. None. Type of 1. Digital Output Enable/Disable signal for controlling an external economizer package. Economizer 2. Series 60 Modulating electric damper motor, or pneumatic via transducer. 3. Pulse Width Modulating electric damper motor, or pneumatic via transducer. 4. None. Proof of Air Flow 1. None. 2. Physically Connected: Contacts closed equals Fan On. Occupancy 1. None. Sensor 2. Connected: Contacts closed equals Occupied. 3. Network (Occ/Unocc signal received via the LONWORKS® Bus network). Window Sensor 1. None. 2. Physically Connected: Contacts closed equals window closed. 3. Network (Window Open/Closed signal received via the LONWORKS® Bus). Wall Module 1. Local (direct wired to the controller). Option 2. Network (sensor value received via the LONWORKS® Bus). Wall Module 1. Sensor only. Type 2. Sensor and Setpoint adjust. 3. Sensor, Setpoint adjust and Bypass. 4. Sensor and Bypass. 5. Sensor, Setpoint adjust, Bypass and 3 position fan switch. 6. Sensor, Setpoint adjust, Bypass and 5 position fan switch. 7. Sensor, Bypass and 5 position fan switch. Smoke 1. None. Emergency 2. Physically Connected: Contacts closed equals smoke detected. Initiation 3. Network (Emergency/Normal signal received via the LONWORKS® Bus). IAQ Option 1. None. 2. Local IAQ Digital Input—directly wired to the controller. (Contacts closed means poor IAQ is detected.) 3. Network (Emergency/Normal signal received via the LONWORKS® Bus).

4. Local CO2 Analog Input—directly wired to the controller. (The sensor must be a 0 to 10V device representing 0 to 2000 PPM CO2.)

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Table 17. Configuration Options Summary For The W7753A. (Continued) Option Possible Configurations Filter Monitor 1. None. Option 2. Local Dirty Filter Digital Input—directly wired to the controller. (Contacts closed means that the filter is dirty.) 3. Local Analog Input for Differential Pressure across the Filter (directly wired to the controller). The sensor must be a 2 to 10V device representing 0 to 5 inw (0 to 1.25 kPa). Shut Down 1. None. Option 2. Local Shut Down Digital Input—directly wired to the controller. (Contacts closed means to shut down the equipment.) Monitor Switch 1. None. Option 2. Local Monitor Switch Digital Input—directly wired to the controller. (Contacts closed means Monitor Switch is closed.) Coil Freeze Stat 1. None. Option 2. Local Coil Freeze Stat Digital Input—directly wired to the controller. (Contacts closed means that coil freeze condition is sensed.) Aqua Stat Make 1. None. On Temp Rise 2. Local AqStatMakeTmpRise Digital Input—directly wired to the controller. (Contacts closed means cooling Option mode, contact open means heating mode.) Aqua Stat Break 1. None. On Temp Rise 2. Local AqStatBrkTmpRise Digital Input—directly wired to the controller. (Contacts closed means Heating Option mode, contact open means cooling mode.) TimeClk Option 1. None. 2. Local TimeClk Digital Input—directly wired to the controller. (Contacts closed means Scheduled Occ mode.) 3. Network (OccSchedule signal received via the LONWORKS® Bus). Drip Pan Full 1. None. 2. Local DripPanFull Digital Input—directly wired to the controller. (Contacts closed means that Drip Pan is Full.) EconEnable 1. None. Option 2. Local EconEnable Digital Input—directly wired to the controller. (Contacts closed means Outside air is suitable for Cooling.)

Common Operations The Excel 10 W7753A Controller applications have many ROOM TEMPERATURE SENSOR (RMTEMP) common operations that are applicable regardless of the type This is the room space temperature sensor. This sensor is the of heating, cooling, or economizer equipment configuration. T7770 Wall Module. When it is configured, it provides the These operations, and the I/O and network configurations for temperature input for the W7753A temperature control loop. If them are summarized in Table 17. it is not configured, it is required that a room temperature sensor value be transmitted from another LONWORKS® Bus Available input options are from the wall module and the hard- device. If no valid room temperature value is available to the wired analog and digital inputs. Each application can have W7753A Controller, the temperature control algorithm in the only a subset of these devices configured based on the controller is disabled, causing the heating, cooling, and number of physical I/O points available. However, some of the economizer control outputs to be turned off. If the W7753A inputs are available over the LONWORKS® Bus network. Controller is configured for Continuous Fan (rather than Intermittent Fan (see Fan Operation in this Appendix), and the NOTE: Each W7753A Controller must have a space temper- mode is Occupied when the RmTemp value becomes invalid, ature sensor input either wired directly to the control- the fan continues to run. ler, or shared from another LONWORKS® Bus device, and must have a digital output configured for control- ling the supply fan. In addition, if modulating econo- mizer control is desired, a discharge air temperature sensor must be physically connected to the Excel 10 W7753A Controller. A discharge temperature signal cannot be brought into the controller through the LONWORKS® Bus network.

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REMOTE SETPOINT (RMTSTPTPOT) — NORMAL causes the override button to set the OverRide This is the Setpoint Potentiometer contained in the T7770 state to OC_BYPASS for BypassTime (default 180 Wall Module. When configured, this occupant value is set to minutes), when the override button has been pressed for calculate the actual cooling or heating Occupied Setpoint. approximately 1 to 4 seconds, or to set the OverRide state There are two options for how to calculate the actual setpoint to UNOCC when the button has been pressed for to be used by the temperature control algorithm: (Offset) and approximately 4 to 7 seconds. When the button is pressed (Absolute Middle). When SetPtKnob is set to Offset, the Wall longer than approximately 7 seconds, then the OverRide Module setpoint knob represents a number from -9° to +9°F state is set to OC_NUL (no manual override is active). (-5° to +5°C) which is added to the software occupied — BYPASS_ONLY causes the override button to set the setpoints for the heat and the cool modes (CoolOccSpt and OverRide state to OC_BYPASS for BypassTime (default HeatOccSpt). When SetPtKnob is set to Absolute Middle, the 180 minutes), on the first press (1 to 7 seconds). On the setpoint knob becomes the center of the Zero Energy Band next press, the OverRide state is set to OC_NUL (no (ZEB) between the cooling and heating occupied setpoints. manual over ride is active). The size of the ZEB is found by taking the difference between the software heating and cooling occupied setpoints; OVERRIDEPRIORITY therefore, for Absolute Middle, the actual setpoints are found OverridePriority configures the override arbitration between as follows: DestManOcc, nviBypass.state, and the wall module override — ActualCoolSpt = RmtStptPot + (CoolOccSpt - HeatOccSpt) /2 button. There are two possible states which have the following — ActualHeatSpt = RmtStptPot - (CoolOccSpt - HeatOccSpt)/2 meanings: — LAST specifies that the last command received from either During Standby and Unoccupied times, the remote setpoint the wall module or DestManOcc determines the effective pot is not referenced, and the software setpoints for those override state. modes are used instead. — NET specifies that when DestManOcc is not OC_NUL, then the effective occupancy is DestManOcc regardless of SETPOINT LIMITS (LOSETPTLIM AND HISETPTLIM) the wall module override state. Remote setpoint pot limits are provided by LoSetptLim and HiSetptLim. The occupied setpoints used in the control CYCLES PER HOUR (HEATCYCHR AND COOLCYCHR) algorithms are limited by these parameters. When the setpoint HeatCycHr specifies the mid-load number of on / off cycles knob is configured to be of type Absolute Middle, the lowest per hour (default is 6), when the mode is HEAT. CoolCycHr actual setpoint allowed is equal to LoSetptLim, and the specifies the mid-load number of on / off cycles per hour highest actual setpoint allowed is equal to HiSetptLim. When (default is 3), when the mode is COOL. This is to protect the the setpoint knob is configured to be an Offset type, the lowest mechanical equipment against short cycling causing actual setpoint allowed is equal to HeatOccSpt - LoSetptLim, excessive wear. In addition the cycle rate specifies the and the highest allowed is equal to CoolOccSpt + HiSetptLim. minimum on and off time according to Table B-4.

BYPASS MODE (STATUSOVRD AND STATUSLED) T7770C,D,E,F,G BYPASS PUSHBUTTON OPERATION During Unoccupied periods, the facility occupant can request The Wall Module Bypass pushbutton, located on the that Occupied temperature control setpoints be observed by T7770C,D,E,F,G in Fig. 12, can change the controller into depressing the Bypass pushbutton on the wall module. When various occupancy modes as follows (see Table 18): activated, the controller remains in Bypass mode until: 1. Bypass Duration Setting has timed out (BypTime), or 2. User again presses the Wall Module pushbutton to Table 18. Wall Module Bypass Pushbutton switch off Bypass mode, or Occupancy Modes. 3. Occupancy schedule (StatusSched network input or If Pushbutton TimeClckOcc digital input) the mode to Occu- is Held Down But for Not pied. for at Least More than Resulting Mode is 4. User sets the CmdManualOcc network point to Not Assigned. <1 second 1 second No Override active 1 second 4 seconds Bypass mode (timed The LED on the Wall Module (StatusLed) indicates the current Occupied override) bypass mode status (see the T7770C,D,E,F,G Wall Module 4 seconds 7 seconds Continuous Unoccupied Override LED section). override BYPASSTIME BypassTime is the time between the pressing of the override button at the wall module (or initiating OC_BYPASS via DestManOcc) and the return to the original occupancy state. When the bypass state has been activated, the bypass timer is set to BypassTime (default of 180 minutes).

OVERRIDETYPE OverrideType specifies the behavior of the override button on the wall module. There are three possible states that have the following meanings: — NONE disables the override button.

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NOTES: — If pushbutton is held down for longer than seven — An error condition is displayed as three short blinks seconds, the controller reverts back to No Over- and one long blink when the Bypass pushbutton is ride and repeats the cycle above. See Fig. 13. held down or shorted. The short must be removed — Continuous Occupied override mode can only be to return the controller to proper operation. initiated remotely; that is, over the LONWORKS® Bus network.

RESET

NOT ASSIGNED (LED OFF)

PRESS FOR LESS PRESS FOR ONE BYPASS THAN ONE SECOND TO FOUR SECONDS TIMEOUT

BYPASS OCCUPIED (LED ON)

PRESS FOR FOUR TO SEVEN SECONDS

PRESS FOR LESS THAN ONE SECOND UNOCCUPIED (LED BLINK)

PRESS FOR MORE THAN SEVEN SECONDS

M8483A

Fig. 13. LED and Bypass pushbutton operation.

STANDBY MODE (STATUSOCYSEN) The digital input for an occupancy sensor (usually a motion Bypass pushbutton is pressed to exit the mode or a network detector or possibly a time clock) provides the controller with a command is sent to clear the mode. A configuration means to enter an energy-saving Standby mode whenever parameter is available to disable wall module initiation of people are not in the room. Standby mode occurs when the Continuous Unoccupied mode (OvrdType). scheduled occupancy is Occupied, and the occupancy sensor detects no people currently in the room (digital input contacts OCCUPANCY MODE AND MANUAL OVERRIDE ARBITRATION Closed means people are in the room, and contacts Open The W7753A has multiple sources for occupancy schedule means the room is Unoccupied). When in Standby mode, the information and, therefore, it employs an arbitration scheme to Excel 10 W7753A Controller uses the Standby Cooling determine the current actual mode. Time-of-day (TOD) Setpoint for cooling (CoolStbySpt), or the Standby Heating schedule status comes from two sources, a configured digital Setpoint for Heating (HeatStbySpt) as the Actual Space input for TimeClckOcc or the StatusSched network input Temperature Setpoint. The occupancy sensor signal can also received from a central control. If the digital input source is be a network input from another LONWORKS® Bus device, so configured, it has highest priority and determines the that no physical sensor is required at the receiving W7753A Occupancy mode. This digital input is either ON (shorted = Controller. occupied), OFF (open = unoccupied), or not active (not configured); otherwise, the status is determined by the IMPORTANT StatusSched input from the network source. The StatusSched When the W7753A Controller is in Standby mode, has three possible states, occupied, unoccupied or standby. the economizer minimum position setting is not observed. This means the fresh air dampers will go Manual Override Status can be derived from three sources fully closed if there is no call for cooling. and governed by two selectable arbitration schemes. The two schemes are (as set in OvrdPriority): CONTINUOUS UNOCCUPIED MODE — Network Wins, or This mode is entered when a wall module is configured with a — Last-in Wins. Bypass pushbutton that was pressed for four to seven seconds causing the wall module LED to blink. This mode can The three sources of manual override status are: also be entered via a network command (ManualOcc set to — CmdManualOcc - Has possible states: Occupied, Unoccupied). If the controller is in this mode, it reverts to the Unoccupied, Bypass, Standby and Not Assigned (not Unoccupied setpoints for temperature control, and the active). This input source has the highest priority in economizer does not observe its minimum position setting. determining manual override status for a Network Wins The controller remains in this mode indefinitely until the arbitration scheme, and in the event there is more than one

74-2964—2 34 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

source change at a time in the Last-in Wins arbitration scheme. Here, bypass initiates a self-timed bypass of the OCCUPIED control unit and expires upon completion of the defined TIME timed period. The controller then treats the bypass status of this input as Not Assigned until the next change in OCCUPIED status. RECOVERY SETPOINT RAMP RATE — DestBypass -Has possible states: Bypass On, Bypass Off or Not Assigned (not active). This input places the controller in an untimed bypass state or turns off the bypass mode. This source is second in priority to UNOCCUPIED CmdManualOcc under the same arbitration schemes OR STANDBY M11956 SETPOINT mentioned above.

NOTE: Bypass status is a controller-timed event whose Fig. 14. Heating Recovery Ramp – HeatRamp, default 8.0 duration is set in BypTime. Upon timer expiration, the degrees F/Hr (4.5 degrees C/Hr). status returns to Not Assigned. The status of this input can be overridden with receipt of Not Assigned NOTE: Recovery ramping applies between scheduled heat- from CmdManualOcc. This, in effect, cancels a timed ing or cooling setpoint changes from UNOCCUPIED bypass or a continuous unoccupied mode. to STANDBY, UNOCCUPIED to OCCUPIED, and STANDBY to OCCUPIED. Scheduled setpoint — Override Button - The wall module Override pushbutton changes from OCCUPIED to UNOCCUPIED or can command status of Bypass, Continuous Unoccupied OCCUPIED to STANDBY do not use a ramped set- and Not Assigned. This source has the lowest priority point but instead use a step change in setpoint. status in the above mentioned schemes. The above Recovery ramps begin before the next scheduled mention sources of override must be either Not Assigned occupancy time and are ramped from the setpoint for or Off before the Override pushbutton affects the manual the existing scheduled occupancy state to the set- override status in the Network Wins scheme. All actions, in point for the next occupancy state. this case, taken from the Override pushbutton are locked out. UNOCCUPIED NOTE: The Override pushbutton can be configured as OR STANDBY SETPOINT Normal (all of the above mentioned states are possible), Bypass Only (Bypass and Not Assigned only) or None (effectively Disabling the Override RECOVERY pushbutton). RAMP RATE OCCUPIED TIME CLOCK (TIMECLCKOCC) SETPOINT TimeClckOcc is the state of the digital input configured and wired to a time clock. When the digital input is detected to be OCCUPIED M11957 Closed (Occupied), the scheduled occupancy will be TIME OC_OCCUPIED. If the detected state of the digital input is Open (Unoccupied), then the scheduled occupancy will be Fig. 15. Cooling Recovery Ramp – CoolRamp, default 3.0 OC_UNOCCUPIED. If the Occ_Time_Clock is not configured, degrees F/Hr (1.7 degrees C/Hr). then either the StatusSched network input received from a central control or the time clock that is broadcast from a NOTES: Sched_Master configured W7753A, will control the occupied — The setpoint used during the COOL recovery mode. period is similar to the heat mode in Fig. 14, except the slope of the line reverses for cooling. SETPOINT RAMPING — Recovery ramping applies between scheduled The W7753A Controller incorporates a ramping feature that heating or cooling setpoint changes from UNOC- gradually changes the space setpoints between occupancy CUPIED to STANDBY, UNOCCUPIED to OCCU- modes. This feature is only operational if the network variable PIED, and STANDBY to OCCUPIED. Scheduled inputs StatusSched, TodEventNext, and Time Until Next setpoint changes from OCCUPIED to UNOCCU- Change Of State (TUNCOS) are being used to change the PIED or OCCUPIED to STANDBY do not use a W7753A Occupancy mode. The applicable Setpoints are ramped setpoint, but instead, use a step change HeatRamp (for HEAT mode operation), and CoolRamp (for in setpoint. Recovery ramps begin before the next the COOL mode operation). See Fig. 14 and 15 for pictorial scheduled occupancy time and are ramped from representations. the setpoint for the existing scheduled occupancy state to the setpoint for the next occupancy state.

FAN OPERATION The W7753A supply fan can be controlled in one of two different ways. In Continuous Fan mode, the fan runs whenever the controller is in Occupied mode. When in Standby or Unoccupied modes, the fan cycles on with a call for cooling (or heating if the FanOnHtMode parameter is set).

35 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

In Intermittent Fan mode, the fan cycles on with a call for DEMAND LIMIT CONTROL (DLC) cooling (or heating if the FanOnHtMode parameter is set), and When The LONWORKS® Bus network receives a high- cycles off when the space temperature control is satisfied. electrical-demand signal, the controller applies a DlcBumpTemp amount to the current actual space The fan control supports an optional (Proof of Air flow) digital temperature setpoint value. The setpoint is always adjusted in input, that allows monitoring of the supply fans status. If the the energy-saving direction. This means that if the W7753A fan is commanded on, the Proof of Air flow digital input is Controller is in Cooling mode, the DLC offset bumps the checked to verify that the fan is running after an initial delay of control point up, and when in Heating mode, bumps the FanOnDelay seconds (user-settable 20 to 60 seconds). Also, control point down. the W7753A Controller provides fan-run-on operation that keeps the fan running for a short time after heating or cooling DIRTY FILTER MONITOR shuts off. The amount of time that the fan continues to run is The air filter in the Unit Vent can be monitored by the W7753A set in FanRunOnHeat for heating mode and FanRunOnCool and an alarm issued when the filter media needs replacement. for cooling mode. The two methods of monitoring the filter are: 1. A differential pressure switch whose contacts are con- WINDOW SENSOR (STATUSWNDW) nected to a digital input on the W7753A; or The digital input for a window contact provides the algorithm 2. A 2-to-10V differential pressure sensor wired to a cur- with a means to disable its temperature control activities if rent input on the W7753A. If the analog input sensor is someone has opened a window or door in the room. When a used, its measured value 0 to 5 inw (0 to 1.25 kPa) is window is detected to be Open (digital input contacts Open compared to a user-selectable setpoint (FltrPressStPt— equals window open), the normal temperature control is valid range: 0 to 5 inw (0 to 1.25 kPa), and the Dirty Fil- disabled, and the W7753A Controller enters the Freeze ter alarm is issued when the pressure drop across the Protect mode. Freeze Protect mode sets the space setpoint to filter exceeds the setpoint. 46.4 °F (8°C) and brings on the fan and heat if the space temperature falls below this setpoint. Normal temperature START-UP control resumes on window closure. The Window sensor START_UP_WAIT is the first mode after application restart or signal can also be a network input from another LONWORKS® power-up. During START_UP_WAIT, the analog and digital Bus device, so that no physical sensor is required at the inputs are being read for the first time, no control algorithms receiving W7753A Controller. are active, and the physical outputs (fan and heat/cooling stages) are in the de-energized position. The node remains in SMOKE CONTROL the START_UP_WAIT mode for a pseudo-random period The Excel 10 W7753A Controller supports three smoke- (depending on neuron_id) between 12 and 22 seconds and related control strategies: then transitions to one of the operating modes, depending on 1. Emergency Shutdown (all outputs off). the inputs that are read from the physical and network inputs. 2. Depressurize (fan on, outdoor air damper closed). The pseudo random period prevents multiple controllers from 3. Pressurize (fan on, outdoor air damper open). simultaneously starting major electrical loads when power is restored to a building. The controller is placed in one of these three control states whenever the W7753A mode becomes NOTES: SMOKE_EMERGENCY, which can be initiated via a network — After a controller download via LONSPEC™, the command (DestEmerg) or from a local (physically connected) delayed reset time is bypassed and the controller smoke detector digital input. When in SMOKE_EMERGENCY starts after a 40-second initialization. mode, the W7753A Controller uses the control strategy found — Not all network inputs can be received during the in SmkCtlMode (one of the three listed above), and the normal START_UP_WAIT period because many network temperature control function is disabled. If a W7753A local variables are updated at a slower rate; therefore smoke detector trips, the SrcEmerg network variable (for other some control decisions can be considered tempo- LONWORKS® Bus devices to receive) is set to the Emergency rarily inappropriate. state. Temperature Control Operations See Fig. 16 for a diagram of a typical W7753A Unit Ventilator.

74-2964—2 36 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

HI FAN LINE DISCHARGE SPEED MED AIR SENSOR LO VOLTAGE LOAD COM LOAD POWER CCW COM FLOATING HEATING ACTUATOR CW COIL HOT WATER OR STEAM

COMPRESSOR COOLING COIL DRAIN PAN CCW COM FLOATING + ACTUATOR CW 24 VAC -

RA OA DAMPERS

OUTSIDE AIR S ENTHALPY 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 SENSOR + OUT 1 OUT 2 OUT 3 OUT 6 OUT 7 OUT OUT 4 OUT 5 OUT 8 OUT 24 VAC 24 VAC 24 VAC COM 24 VAC DI-4 DI-3 DI-2 DI-1 GND GND

W7753A TRIAC EQUIVALENT CIRCUIT UNIT VENTILATOR CONTROLLER

E-BUS SNSR GND SETPT GND GND E-BUS JACK 1 LED BYPASS AI-3 V/mA AI-3 V/mA AI-4 V/mA AI-4 V/mA E GND AI-1 OHM AI-2 OHM 22 VDC OUT 22 VDC OUT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 J3

2

??E-BUS??

2 9 8 7 6 5 4 3 2 1

LED OUTSIDE SET PT PT SET

BYPASS BYPASS SPD FAN AIR CO SENSOR E-BUS E-BUS GND SENSOR 1 EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO 14 AWG (2.O MM2) WITH A MINIMUM T7770F OF 18 AWG (1.O MM2), FOR EARTH GROUND WIRE. WALL 2 TO ASSURE PROPER ELECTRICAL CONTACT, JACK FOR E-BUS WIRES MUST BE TWISTEDTOGETHER BEFORE MODULE NETWORK INSERTION INTO THE TERMINAL BLOCK. ACCESS M12691

Fig. 16. Schematic diagram for a typical W7753A Unit Ventilator.

37 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

STAGED COOLING CONTROL The Excel 10 W7753A Controller supports up to two stages of The PID control algorithm used to control staged cooling is D/X cooling. As space temperature rises above the current anticipator-driven, and is similar to the algorithm used in the Cooling Setpoint, the controllers mode of operation is T7300 commercial thermostat. All staging events are subject switched to the COOL mode. When in the COOL mode, all to a minimum interstage time delay, which is based on the heating outputs are driven closed or off (with the exception cycles per hour user setting (CoolCycHr). The minimum that occurs during IAQ Override Operation, see above), and interstage time delay ranges from 90 seconds (at 12 cycles the staged cooling outputs are enabled for use. When in the per hour) to 8.5 minutes (at two cycles per hour), see Table COOL mode, the PID cooling control algorithm compares the 19. The user has the option to disable the minimum run timer current space temperature to the EffectiveCoolSetPt, and (DisMinClTimer for cooling). If the minimum run timer is calculates a PID error signal. This error signal causes the disabled, the interstage time delay is fixed at 20 seconds. The cooling stage outputs to be cycled as required to drive the cycling rate is separately selectable for heating and cooling space temperature back to the setpoint. Fig. 17 illustrates the between 2 and 12 cycles per hour (cph). relationship between PID error and staged output activity. As the error signal increases and the space temperature is Table 19. Interstage Minimum Times. getting farther away from setpoint, or is remaining above setpoint as time elapses, additional stages of cooling are Cycles/Hour Selection Minimum On/Off time (Min.) energized until, if PID error reaches 100 percent, all 28.5 configured stages are on. 35.5 If economizer dampers are configured, and the outdoor air is 44.0 suitable for , the economizer operates as the first 53.5 stage of cooling. For example, if a controller was configured with two stages of mechanical cooling and an economizer, the 63.0 application should be viewed as a three-stage system. 72.5 82.0 Setpoints for the PID gains allow for unit-by-unit adjustment of the control loop, if required; however, any change from the 92.0 default values should be minimal. 10 2.0 11 1.5 12 1.5

PID ERROR NO. STAGES 0% 25% 33% 50% 66% 75% 100% > 100% CONFIGURED

ALL STAGES ONE STAGE CYCLING LOCKED ON

STAGE 1 STAGE 1 LOCKED ON ALL STAGES TWO STAGES CYCLING STAGE 2 CYCLING LOCKED ON

M11958

Fig. 17. Staged output control versus PID Error.

STAGED HEATING CONTROL The Excel 10 W7753A Controller supports up to two stages of setpoint as time elapses, additional stages of heating are heating. As space temperature falls below the current Cooling energized until, if PID error reaches 100 percent, all Setpoint, the controller mode of operation is switched to the configured stages are on. HEAT mode. When in the HEAT mode, all cooling outputs are driven closed or off, and the staged heating outputs are The PID control algorithm used to control staged heating is enabled for use. When in the HEAT mode, the PID cooling anticipator-driven, and is similar to the algorithm used in the control algorithm compares the current space temperature to T7300 commercial thermostat. All staging events are subject the EffectiveHeatSetPt, and calculates a PID error signal. This to a minimum interstage time delay, that is based on the error signal causes the heating stage outputs to be cycled, as cycles per hour user setting (HeatCycHr). The minimum required, to drive the space temperature back to the Setpoint. interstage time delay ranges from 90 seconds (at 12 cycles There is a relationship between PID error and staged output per hour) to eight minutes (at two cycles per hour). See Table activity. As the error signal increases, the space temperature 19. The user has the option to disable the minimum run timer gets further away from the setpoint, or is remaining below the for heating (DisMinHtTimer). If the minimum run timer is

74-2964—2 38 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER disabled, the interstage time delay is fixed at 20 seconds. The 12.9 seconds. The W7753A Controller would command the cycling rate is separately selectable for heating and cooling valve output on for 12.9 seconds every 25.6 seconds to between two and 12 cycles per hour (cph). maintain the valve position at 50 percent.

Setpoints for the PID gains allow for unit-by-unit adjustment of AQUASTAT the control loop, if required; however, any change from the The Excel 10 W7753A Controller supports a digital input for default values should be minimal. an Aquastat that would be used for Heat/Cool changeover. The aquastat can be either contacts-closed-on-temp-rise or CASCADE CONTROL OF MODULATING COOLING/HEATING contacts-close-on-temp-fall. The digital input must be The Excel 10 W7753A Controller supports modulating cooling configured for the appropriate device through LONSPEC™. The and heating valves. These valves can be controlled directly Aquastat would indicate to the control algorithm in the from the space temperature (like the staged control) or, if the controller that if heating is available, the cooling coil or DX CascCtrl flag is set, they are modulated to maintain the would be locked out. Conversely, if the Aquastat indicated that discharge air temperature at its setpoint. The discharge air heating was no longer available, the cooling coil or DX would setpoint is calculated based on the space temperature be enabled. The Aquastat will not change the Heat/Cool mode deviation from the space setpoint. This is commonly called of the controller, only lock out or enable the cooling coil. cascade control. In the W7753A Controller, cascade control is available for use with Series 60 and PWM modulating heating OUTDOOR AIR LOCKOUT OF HEATING/COOLING and cooling, but not for use with staged heating/cooling. A mechanism is provided in the W7753A to disable the heating equipment if the outdoor air temperature rises above Setpoints for the PID gains and for the control band allow for the OaTempHtLkOut setpoint. Similarly, the cooling equipment unit-by-unit adjustment of the control loops, if required; is disabled if the outdoor air temperature falls below the however, any change from the default values should be OaTempClLkOut setpoint. The algorithm supplies a fixed 2°F minimal. Also, the W7753A Controller uses an adaptive (1.1°C) hysteresis with the lock-out control to prevent short algorithm (patent pending) to continuously assess the validity cycling of the equipment. of the calculated discharge setpoint, and adjust it, as needed, to ensure precise, accurate control. ASHRAE CONTROL CYCLES ASHRAE classifies the control of unit ventilators as follows: SERIES 60 MODULATING CONTROL Cycle I Fixed Maximum Percentage of Outdoor Air (100 Series 60 Control is also commonly referred to as Floating percent - no user adjustable parameter). Control. The Excel 10 W7753A Controller can drive Series 60 Cycle II Fixed Minimum Percentage of Outdoor Air (usually type actuators to control a modulating cooling valve, a heating 10 to 33 percent, adjustable from 0 to 100 percent). valve, and economizer. When floating control is used, the full- Cycle III Variable Outdoor Air (Mixed air control – typically stroke motor drive time of the actuator must be entered into 55 to 60 degrees F.). the configuration parameter CoolMtrSpd (for cooling), HeatMtrSpd (for heating), or EconMtrSpd (for the economizer Cycles I, II, and III differ in the sequence of damper action in dampers). response to a rise in space temperature and in the amount of outdoor air admitted at various temperatures. Each of the PULSE WIDTH MODULATING (PWM) CONTROL ASHRAE cycles will be explained in the following sections on The Excel 10 W7753A Controller can drive a PWM-type the damper control. actuator to control a modulating cooling valve, a heating valve, and economizer dampers. PWM control positions the STANDBY/WARMUP actuator based on the length, in seconds, of the pulse from In the Standby/warmup state (can be used with any of the the digital output. The controller outputs a pulse whose length three ASHRAE cycles), the fan is shut down (manually, time consists of two parts, a minimum and a maximum. The clock, or network override). The outdoor air damper is closed minimum pulse time represents the analog value of zero and the heating coil is full open to heat. The heating coil acts percent (also indicates a signal presence) and the maximum as a convector as air circulates by gravity across the coil. The pulse length that represents an analog value of 100 percent. If room thermostat modulates the valve, closing the valve as the analog value is greater than zero percent, an additional space temperature rises above the room setpoint. The fan time is added to the minimum pulse time. The length of time does not typically operate in the standby mode. If the network added is directly proportional to the magnitude of the analog variable FanOnHtMode is set to true, then the fan will cycle on value. If PWM control is used, the configuration parameters and off with a demand for heating when the effective for the PWM operation must be specified. These are occupancy is standby. During the warm-up mode, the fan is PwmPeriod, PwmZeroScale, and PwmFullScale. These three running and the unit ventilator recirculates space air and parameters are shared by all configured PWM outputs; this controls the heating valve for a rapid rise in the space means the heating, cooling, and economizer actuators must temperature. be configured to accept the same style of PWM signal. CYCLE I DAMPER CONTROL – FIXED MAXIMUM PERCENTAGE OF Example: To find the pulse width of a valve actuator (for OUTDOOR AIR example stroke mid position - 50 percent) with the The outdoor air damper and heating coil valve operate in PwmZeroScale = 0.1 seconds, PwmFullScale = 25.5 sequence. When cycle I begins, the heating valve is full open seconds, and the PwmPeriod = 25.6 seconds. There are 256 and the outdoor air damper is full closed. As space increments available, so the number of increments required temperature rises, the controller modulates the damper to its for 50 percent would be (0.5 X 256) or 128. The time for each maximum open position. The fixed maximum position is increment for this industry standard pulse time is 0.1 seconds. normally 100 percent open. As the space temperature The pulse width is the minimum time (0.1 second) + the continues to rise, and after the damper moves to its maximum number of increments (128 times the seconds added 0. 1) =

39 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

position, the heating coil valve modulates closed. If a cooling minimum ventilation codes. The space temperature control coil is installed in the unit, then the cooling coil valve will maintains the room at setpoint by modulating the heating and modulate open as space temperature rises further. cooling coil valves or stages as needed.

If the discharge air temperature falls below the low-limit Whenever the fan turns off, the outdoor and return air setpoint, the controller will override the space temperature dampers will move to the 100 percent return air position. The control and modulates the heating coil valve open to maintain heating coil valve will open (cooling coil valve will go closed), a minimum discharge temperature. and the unit ventilator will function as a convector.

CYCLE II DAMPER CONTROL – FIXED MINIMUM PERCENTAGE OF INDOOR AIR QUALITY (IAQ) OVERRIDE OUTDOOR AIR The Excel 10 W7753A Controller supports an IAQ override Cycle II control provides a fixed minimum percentage of feature that upon detection of poor air quality in the space, outdoor air (usually 10 to 33 percent, adjustable from 0 to 100 allows the economizer dampers to be opened above the percent) during the occupied mode. At low space standard minimum position setting to a value set in temperatures, the outdoor air damper is closed and the EconIAQPos. Two different methods of detecting poor air heating coil valve is full open. As the space temperature rises, quality are supported, The first is by using an IAQ switch the outdoor air damper moves to its minimum position. On a device connected to a digital input on the W7753A Controller, further rise in the space temperature, the heating coil valve where a contact closure indicates poor air quality and initiates modulates toward the closed position. As the space the IAQ override mode. The second, is through an analog temperature rises above the space setpoint, the outdoor and input that connects to a CO2 Sensor (0 to 10V). The return air dampers modulate to the 100 percent outdoor air at measured value of CO2 from this sensor (0 to 2000 ppm) is the top of the throttling range. The low limit controller can limit compared to the setpoint IAQSetpt. When the CO2 level is opening of the outdoor air damper to prevent the discharge air higher than the setpoint, the IAQ override is initiated. temperature from dropping below the low limit setpoint. When the W7753A Controller is in the COOL mode during an Whenever the fan shuts off, the fan interlock causes the IAQ override, it is possible for the heating outputs to be outdoor and return air dampers to go to the 100 percent return activated. This can occur if the outdoor air temperature is cold air position. enough to cause the discharge air temperature to drop below the DaTempLoLim setpoint when the dampers open to the A mixed-air economizer damper package can be controlled to EconIAQPos position, and the IaqUseHeat flag is set. If this assist mechanical cooling in maintaining the discharge air at situation occurs, the heating is controlled to maintain the setpoint. Therefore, if modulating economizer damper control discharge air temperature at 1°F (0.65°C) above the is desired, a discharge air temperature sensor is required. If DaTempLoLim setpoint. the outdoor air is not currently suitable for cooling use (see the Economizer Enable/Disable Control section), the outdoor air OUTDOOR AIR QUALITY (OAQ) OVERRIDE damper is held at the user-settable minimum position The Excel 10 W7753A Controller supports an OAQ override (EconMinPos) for ventilation purposes. feature that upon detection of poor air quality in the Outdoor air, allows the economizer dampers to be closed below the Because the outdoor air can be used to supplement standard minimum position setting to a value set in mechanical cooling, the economizer operates as if it were the (EconMinPos). Two different methods of detecting poor air first stage of cooling. So, if the outdoor air is suitable for quality are supported, The first is through an analog input that cooling use, the mechanical cooling (either staged or connects to a CO2 Sensor (0 to 10V). The measured value of modulating) is held off until the economizer has reached its CO2 from this sensor (0 to 2000 ppm) is compared to the fully open position. Then, if the discharge temperature setpoint OAQSetpt. When the CO2 level is higher than the continues to be above setpoint, the mechanical cooling is setpoint, the OAQ override is initiated. The second, is through allowed to come on. If the outdoor air is not suitable for an analog input that connects to a CO Sensor (4 to 20mA). cooling use, the economizer is set to its minimum position, The measured value of CO from this sensor (0 to 300 ppm) is and mechanical cooling is allowed to come on immediately. compared to the setpoint OAQSetpt. When the CO level is higher than the setpoint, the OAQ override is initiated. When the controller is in the Heat mode, the economizer is held at the minimum position setting (EconMinPos). The DISCHARGE AIR LOW LIMIT CONTROL minimum position setting is only used during Occupied mode If the discharge air temperature falls below the user-settable operation. When in Standby or Unoccupied modes, the discharge air low limit setpoint (DaTempLoLim), an alarm is outdoor air dampers are allowed to fully close if there is no call issued, and the controller will modulate the heating coil valve for cooling, or if the outside air is not suitable for cooling use. open to maintain a minimum discharge temperature (cycle I). For cycle II and III, if the discharge air temperature falls below CYCLE III DAMPER CONTROL – VARIABLE OUTDOOR AIR the user-settable discharge air low limit setpoint MAINTAINING CONSTANT MIXED AIR TEMPERATURE (DaTempLoLim), an alarm is issued, and the outdoor air Cycle III control provides a variable percentage of outdoor air damper could be driven below the minimum position setting to depending on the outdoor air temperature. The mixed air prevent the discharge temperature from dropping below the control modulates the outdoor and return air dampers, to low limit. If necessary, the damper can go completely closed maintain a constant mixed air temperature (typically 55 to 60 even during Occupied mode operation. As the discharge degrees F.). There is no outdoor air damper minimum position temperature warms up, the economizer modulates open until setting for cycle III, therefore it can not be used in areas with the minimum position setting is reached. At this point, the low limit alarm is cleared.

74-2964—2 40 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

ECONOMIZER ENABLE/DISABLE CONTROL (PERTAINS TO ASHRAE 8. Single Calculated Enthalpy—the calculated outdoor CYCLE II AND III) enthalpy in BTU/lb (kJ/kg) is compared to the enthalpy The W7753A Controller has inputs to determine if the outdoor setpoint (OaEnthEn) in BTU/lb (kJ/kg), and the outdoor air is suitable to augment cooling. The economizer dampers temperature is compared to the outdoor temperature can be enabled/disabled for using outdoor air as the first stage limit setpoint (OaEconEnTemp) for a high limit. The of cooling based on one of ten allowable strategies: compared difference determines whether outdoor air is 1. Digital Input En/Disable—contact closure enables suitable for use to augment mechanical cooling. economizer. 9. Differential Enthalpy, Either Sensed or Calculated— 2. Outdoor Temperature—when the outdoor temperature the difference between outdoor enthalpy and return air is less than OaEconEnTemp, then the outdoor air is enthalpy determines whether outdoor air or return air is suitable to augment cooling. more suitable to augment mechanical cooling. When 3. Outdoor Enthalpy, Type A—when the outdoor enthalpy sensors are configured, they are used for com- enthalpy meets the H205 type A requirements, the out- paring enthalpy. If no enthalpy sensors are available, door air is suitable to augment cooling. then enthalpy is calculated using outdoor and return air 4. Outdoor Enthalpy, Type B—when the outdoor humidity and temperature sensors. The switching differ- enthalpy meets the H205 type B requirements, the out- ential is fixed at 1.0 mA for enthalpy sensors, and 0.25 door air is suitable to augment cooling. BTU/lb (0.582 kJ/kg) for calculated enthalpy. 5. Outdoor Enthalpy, Type C—when the outdoor enthalpy meets the H205 type C requirements, the out- NOTE: If no return temperature sensor is configured, door air is suitable to augment cooling. space temperature is used to calculate return 6. Outdoor Enthalpy, Type D—when the outdoor air enthalpy. enthalpy meets the H205 type D requirements, the out- door air is suitable to augment cooling. 10. Network Enabled—the network input (EconInValue) 7. Differential Temperature—the difference between out- controls the enabling and disabling of the economizer. door temperature and return air temperature is com- pared to DiffEconEnTemp to determine whether outdoor Table 20 lists the applicable engineering units for the analog air or return air is more suitable for use to augment points found in the W7753A. mechanical cooling.

Table 20. Engineering Units For Analog Points. English Units (Inch-Pound) Standard International Units (SI) Measured Item Description Abbreviation Description Abbreviation Temperature Degrees Fahrenheit F Degrees Celsius C Relative Temperature Delta Degrees Fahrenheit DDF Degrees Kelvin K Relative Humidity Percent % Percent % Air Flow Cubic Feet per Minute CFM Meters Cubed per Hour m3h

CO2 Concentration Parts Per Million PPM Parts Per Million PPM Enthalpy British Thermal Units per Pound of Air btu/lb kiloJoules/kilogram kj/kg Differential Pressure Inches of Water Column inw kiloPascal kPa

41 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Appendix C: Sensor Data for Calibration

Resistance Sensors

Sensor Type: C7100A, C7170A. (PT3000) Sensor Type: C7041B,C,D,F,J,K (W7750B,C only).

Sensor Use: Discharge air, Outdoor air. Sensor Use: Return Air, Discharge Air Temperature (20K ohm). Table 21 lists the points for sensor resistance versus temperature. Fig. 18 shows the graph of these points. Fig. 19 shows the graph of 20K ohm sensor resistance versus temperature. Table 21. PT3000 Sensor Resistance Versus Temperature. Sensor Type: T7770A,B,C,D; T7560A,B and C7770A. °F Resistance Ohms (20K ohm) -40 2916.08 -30 2964.68 Sensor Use: Space Temperature and Discharge/Return Air Temperature. -20 3013.28 -10 3061.88 Fig. 19 shows the graph of sensor resistance versus temperature. 0 3110.48 10 3159.08 80K 20 3207.68 30 3256.28 70K

40 3304.88 60K

50 3353.48 50K 60 3402.08 40K 70 3450.68 30K

80 3499.28 RESISTANCE (OHMS) 20K OHM AT 90 3547.88 20K 77oF (25oC)

100 3596.48 10K 110 3645.08 120 3693.68 30 40 50 60 70 80 90 100 110 oF 0 10 20 30 40 oC TEMPERATURE (DEGREES) M5874A SENSOR RESISTANCE VERSUS TEMPERATURE 3750 Fig. 19. 20K ohm sensor resistance versus temperature. 3700 3650 3600 Sensor Type: 3550 3500 T7770B,C 10K ohm linear setpoint potentiometer (Relative). 3450 3400 3350 Sensor Use: Setpoint Offset Temperature. 3300 OHMS 3250 Sensor Resistance versus Temperature Difference 3200 3150 (above and below the setpoint): 3100 Offset -9°F: 9574 ohms. 3050 3000 Setpoint: 5500 ohms. 2950 Offset +9°F: 1426 ohms. 2900 -40-30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 DEGREES F M11615 Sensor Type: T7770B,C 10K ohm setpoint potentiometer (Absolute). Fig. 18. PT3000 Sensor resistance versus temperature. Sensor Use: Direct Setpoint Temperature.

Sensor Resistance versus Temperature: 55°F (13°C): 9574 ohms. 70°F (21°C): 5500 ohms. 85°F (29°C): 1426 ohms.

74-2964—2 42 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Voltage/Current Sensors

Sensor Type: C7600B 2 to 10V. Sensor Type: C7600C (4 to 20 mA).

Sensor Use: Humidity. Sensor Use: Humidity.

Table 22 lists the points for sensor voltage versus humidity. Table 23 lists the points for sensor voltage versus humidity. Fig. 20 shows the graph of these points. Fig. 21 shows the graph of these points.

Table 22. C7600B Sensor Voltage Versus Humidity. Table 23. C7600C Sensor Current Versus Humidity. Humidity Percentage Sensor Voltage Relative Humidity Percentage Sensor Current 10 2.67 10 5.6 15 3.08 20 7.2 20 3.48 30 8.8 25 3.88 40 10.4 30 4.28 50 12.0 35 4.68 60 13.6 40 5.08 70 15.2 45 5.48 80 16.8 50 5.88 90 18.4 55 6.28 60 6.69 20 RH (%) I (mA) 18 65 7.09 10 5.6 20 7.2 70 7.49 16 30 8.8 75 7.89 14 40 10.4 50 12.0 80 8.29 12 60 13.6 70 15.2 85 8.69 10 80 16.8 90 18.4 CURRENT IN mA CURRENT 90 9.09 8 6 SENSOR VOLTAGE VERSUS HUMIDITY PERCENTAGE 4 0 10 2030 40 50 60 70 80 90 100 10.00 HUMIDITY IN % RH M3131B 9.50 9.00 8.50 8.00 Fig. 21. C7600C output current versus humidity. 7.50 7.00 6.50 6.00 VOLTS 5.50 5.00 4.50 4.00 3.50 3.00 2.50 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 PERCENTAGE M11610

Fig. 20. C7600B Sensor voltage versus humidity.

43 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Sensor Type: C7400A. Sensor Use: Enthalpy. Table 24 lists the points for sensor current versus enthalpy (volts). Fig. 22 shows the graph of these points. Table 24. C7400A Sensor Current Versus Voltage (Vdc). Sensor Current (mA) Voltage (Vdc) 41 51.25 61.49 71.74 81.99 92.24 10 2.49 11 2.74 12 2.99 13 3.24 14 3.49 15 3.74 16 3.98 17 4.23 18 4.48 19 4.73 20 4.98

SENSOR CURRENT VERSUS ENTHALPY (VOLTS)

5.00 4.75 4.50 4.25 4.00 3.75 3.50 3.25 3.00 2.75 2.50 2.25

ENTHALPY (VOLTS) 2.00 1.75 1.50 1.25 1.00 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 (MA) M11607

Fig. 22. C7400A Sensor current versus enthalpy (volts).

See Fig. 23 for partial psychrometric chart for a C7400A Solid State Enthalpy Sensor.

See Fig. 24 for a C7400A Solid State Enthalpy Sensor output current vs. relative humidity.

74-2964—2 44 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

85 90 95 100 105 110 (29) (32) (35) (38) (41) (43)

CONTROL CONTROL POINT CURVE APPROX. F ( C) AT 50% RH 80 (27) A 73 (23) B 70 (21) C 67 (19) 8 40 42 44 46 D 63 (17) 75 (24) 36 3 4

VE HUMIDITY (%)

70 (21) RELATI

100 65 90 (18) 80 ENTHALPY—BTU4 26 28 PER 30 POUND 32 3 DRY AIR 70

60 60 (16) 50 A 40 55 (13) B 30 50 (10) C 20 45 12 14 16 18 20 22 2 D (7) 40 (4) 10 35 (2)

B A D C

35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 (2) (4) (7) (10) (13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43) APPROXIMATE DRY BULB TEMPERATURE— F ( C) M11806

Fig. 23. Partial psychrometric chart for a C7400A Solid State Enthalpy Sensor.

C7400A OUTPUT CURRENT 100

90

80

70

20 mA 18 mA 16 mA 14 12 mA 10 m 60 8 mA 6 mA 4 mA mA

A 50 PERCENT RH

40 D = 17 MA C = 15.5 MA B = 13.5 MA 30 A = 11 MA 20

10 DC BA 4050 60 70 80 90 100 (4) (10) (16) (21) (27) (32) (38)

TEMPERATURE F ( C) M11605

Fig. 24. C7400A Solid State Enthalpy Sensor output current versus relative humidity.

45 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Sensor Type: C7232 or C7632. Sensor Type: P7640A,B (4-20 mA with 500 ohm resistor to convert to 2-10 Vdc). Sensor Use: CO2 concentration. Sensor Use: Sensor voltage (Vdc) /pressure (in. w.c.) 2 to Table 25 lists the points for sensor voltage versus CO2 10 Vdc, 0 to 5 in. w.c. (1.25 kPa). concentration. Fig. 25 shows the graph of these points. Table 26 lists the points for sensor voltage (Vdc) versus Table 25. C7232, C7632 Voltage Versus CO2 Concentration. pressure (in. w.c.). Fig. 26 shows the graph of these points.

CO2 Concentration PPM Sensor Voltage Table 26. P7640 Voltage (Vdc) Versus Pressure (in. w.c.). 00.00Pressure in. w.c. (kPa) Sensor Voltage (Vdc) 100 0.50 0.00 (0.00) 2.00 200 1.00 0.50.(0.13) 2.80 300 1.50 1.00 (0.25) 3.60 400 2.00 1.50 (0.37) 4.40 500 2.50 2.00 (0.5) 5.20 600 3.00 2.50 (0.62) 6.00 700 3.50 3.00 (0.75) 6.80 800 4.00 3.50 (0.87) 7.60 900 4.50 4.00 (1.00) 8.40 1000 5.00 4.50 (1.12) 9.20 1100 5.50 5.00 (1.25) 10.00 1200 6.00 1300 6.50 SENSOR VOLTAGE VERSUS PRESSURE

1400 7.00 10.00

1500 7.50 9.00

1600 8.00 8.00

1700 8.50 7.00

1800 9.00 6.00 1900 9.50 5.00

2000 10.00 VOLTS (VDC) 4.00

3.00 SENSOR VOLTAGE VERSUS CO2 CONCENTRATION 10 2.00 0 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 9 INW M11606 8 7 Fig. 26. P7640 voltage (Vdc) versus pressure (in. w.c.). 6 5 Sensor Type: Third party (2 to 10V). VOLTS 4 3 Sensor Use: Monitor voltage. 2 1 0 100 300 500 700 900 1100 1300 1500 1700 1900 200 400 600 800 1000 1200 1400 1600 1800 2000 PPM M11611

Fig. 25. C7232, C7632 voltage versus CO2 concentration.

LON®, Neuron®, and LONWORKS® are registered trademarks of Echelon® Corporation. LONMARK® and LONMARK logo are registered trademarks of the LONMARK Interoperability Association.

74-2964—2 46 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

47 74-2964—2 EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER

Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 customer.honeywell.com

® U.S. Registered Trademark © 2005 Honeywell International Inc. 74-2964—2 M.S. Rev. 10-05