W8703A Damper Interface Module INSTALLATION INSTRUCTIONS APPLICATION The W8703A Damper Interface Module (DIM) controls up to three conventional zone dampers when used with T8635L Microelectronic Communicating Programmable Thermostats and the W8635 Equipment Interface Module, Table 1. The W8703A uses Enviracom, a lowcost wired communications protocol. Using the W8703A Damper Interface Module with up to three T8635L Microelectronic Communicating Programmable Thermostats and a W8635A,B Equipment Interface Module enables the following features: * Outdoor temperature display in all zones with only one C7089B Outdoor Temperature Sensor connected. * Vacation Hold in all zones. * Check LED in all zones (when used with the W8635B Equipment Interface Module for heat pumps). * System switch setting automatically changes in all zones. * Individual fan control in each zone. NOTES: -- * Time synchronization. * Shared filter indication. -- Up to three T8635 Thermostats can be controlled with the W8703A Damper Interface Module. Up to six zones can be controlled using two W8703A and up to nine zones can be controlled using three W8703A. Table 1. W8703A Description. Model W8703A Application Controls up to three zone dampers. Recommended Zone Dampers Trol-A-Temp Model AOBD or Trol-A-Temp Model ARD or Trol-A-Temp Model ZD Required Accessories 1. 2. 3. T8635L Microelectronic Communicating Programmable Thermostat. W8635A Equipment Interface Module for up to 2H/2C conventional applications or W8635B Equipment Interface Module for up to 2H/1C heat pump applications. INSTALLATION When Installing this Product . . . 1. 2. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. (R) U.S. Registered Trademark Copyright (c) 2002 Honeywell * * All Rights Reserved 4. 5. Comments Use with T8635L Microelectronic Communicating Programmable Thermostat and W8635A,B Equipment Interface Modules. Installer must be a trained, experienced service technician. After installation is complete, check out product operation as provided in these instructions. Follow local codes for installation and application. CAUTION Voltage Hazard. Can cause electrical shock or equipment damage. Disconnect power before beginning installation. Location Locate the W8703A in the equipment room near the HVAC equipment. See Fig 1. 69- 1344- 1 W8703A DAMPER INTERFACE MODULE WALL W8703 EN OP E OS CL FURNACE OR BOILER WATER HEATER M13427 EN OP E OS CL Fig. 1. Mounting W8703A on wall or duct. ZONE B EN OP E OS L C ZONE C MOUNTING HOLES (2) ZONE A W8703A 1 2 3 MOUNTING SCREWS (2) 1 TR 2 TR M CO Mounting M13440 CAUTION Mounting Location Hazard. Mounting W8703A inside HVAC equipment can damage the DIM. Mount the W8703A only on the outside of HVAC equipment. Remove the cover from the W8703A by pulling it from the center or the corners of the module. 2. Locate the two mounting holes. See Fig 1. 3. Position the W8703A on the wall or the cold air return. 4. Level the W8703A for appearance only; the device will function properly even when not level. 5. Use a pencil to mark the position of the mounting holes on the wall or cold air return. 6. Remove the W8703A from the wall or cold air return and drill 3/16 in. holes in the wall (if drywall) where marked. For firmer materials such as plaster or wood, drill 7/32 in. holes. See Fig. 2. 7. Gently tap the anchors (provided) into the holes until flush with the wall. 8. When mounting on the cold air return, drill a pilot hole where marked. 9. Reposition the W8703A over the holes. 10. Loosely insert the screws into the holes. 11. Tighten the screws. Fig. 2. Mounting W8703A Damper Interface Module. WIRING CAUTION 1. 69-1344-1 Voltage Hazard. Can cause electrical shock or equipment damage. Disconnect power before beginning installation. All wiring must comply with local codes and ordinances. Use the following steps: 1. 2. Loosen the terminal screws on the W8703A and connect the system wires; see Fig. 3 and Table 2. Securely tighten each terminal screw. FOR WRAPAROUND INSERTION STRIP 7/16 IN. (11 MM). FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM). M4826 Fig. 3. Correct wiring technique. 2 W8703A DAMPER INTERFACE MODULE Table 2. Terminal Designations W8703A Terminal Designations Zone A Function 1 To communications bus. 2 To communications bus. 3 To communications bus. TR1 To external 24 Vac transformer - to power zone dampers.a TR2 To external 24 Vac transformer - to power zone dampers.a Open Connect to zone 1 zone damper.b Closed Zone B Open Connect to zone 2 zone damper.b Closed Zone C Open Connect to zone 3 zone damper.b Closed a Transformer must be appropriately sized to supply power to total damper load (60 VA maximum). 30 VA maximum damper load per zone. 5. 6. 7. 8. T8635L T8635L C7089B OUTDOOR TEMPERATURE SENSOR OT 10. If the application is for 4-6 forced air zones, then connect an additional W8703 and a corresponding transformer. For 6-9 zones, then connect a third W8703 and a corresponding transformer. See SETTINGS for instructions on how to set the DIP switches on the W8703 If the application is for 4-6 hydronic zones, connect an additional W8703 and a corresponding transformer. Wire the second W8703 COM terminal to terminal 4 on the R8222N1011, and terminal number 6 on the relay to zone 4-6 zone valves or circulator relays. For 7-9 hydronic zones use the normally open contacts on a 4PDT 4 pole relay in the same way for each of the three W8703 panels. OT 2 1 3 OT T8635L OT 2 1 OT 3 W8635A FAN RELAY 2 4 5 6 Z 1 2 3 X G C W1 R W2 Y1 RH RC Y2 SYSTEM TRANSFORMER OPEN CLOSE HEAT 1 RELAY 3 L2 HEAT 2 RELAY COOL 1 RELAY 4 5 6 Z 1 2 3 X OPEN CLOSE OPEN CLOSE COOL 2 RELAY 1 1 1 2 3 W8703A 1 L1 (HOT) OT 4 5 6 Z 1 2 3 X ZONE A 4. 9. See Fig. 4 to wire the T8635L, W8635A and W8703A in forced air systems. See Fig. 5 and 6 to wire hydronic heat with V8043 zone valves. See Fig. 7-9 to wire hydronic heat with circulators. See Fig. 10 to wire hydronic heat with V8043 zone valves and an indirect water heater. See Fig. 11 to wire hydronic heat with time-out on an indirect water heater. Connect a 24 VAC transformer to the W8703. Connect HVAC system 24 VAC to the W8635. Provide disconnect means and overload protection as required. 1 ZONE B 3. 2 ZONE C b TR1 TR2 3 L1 (HOT) L2 COM EXTERNAL 40 VA TRANSFORMER FACTORY INSTALLER JUMPERS. MODEL AOBD ZONE DAMPER MODEL ARD OR ZD DAMPER M13430A Fig. 4. T8635L/ W8703A/ W8635A wiring diagram. 3 69-1344-1 W8703A DAMPER INTERFACE MODULE T8635L T8635L C7089B OUTDOOR TEMPERATURE SENSOR OT OT 1 2 OT 3 T8635L OT 1 2 OT 3 OT 1 2 3 V8043F TR W8703A TH TH-TR CLOSE END SWITCH TH TH-TR OPEN CLOSE V8043F TR END SWITCH OPEN CLOSE TH 1 ZONE B OPEN TR ZONE A V8043F 2 ZONE C END SWITCH TR1 TR2 3 L1 (HOT) L2 COM EXTERNAL 40 VA TRANSFORMER TH-TR T BOILER T W8635A R8222N1011 1 3 1 2 3 G L2 C W1 R W2 Y1 RH RC L1 (HOT) Y2 SYSTEM TRANSFORMER M20251A Fig. 5. Hydronic heat with V8043 zone valves and non-zoned air conditioning wiring diagram. 69-1344-1 4 W8703A DAMPER INTERFACE MODULE T8635L T8635L C7089B OUTDOOR TEMPERATURE SENSOR OT OT 1 2 OT 3 T8635L OT 1 2 3 OT OT 1 2 3 V8043F TR W8703A TH TH-TR CLOSE TH END SWITCH TH-TR OPEN CLOSE V8043F TR END SWITCH OPEN CLOSE TH 1 ZONE B OPEN TR ZONE A V8043F 2 ZONE C END SWITCH TR1 TR2 3 L1 (HOT) L2 COM EXTERNAL 40 VA TRANSFORMER TH-TR T BOILER T ARD ARD ARD W8635A FORCED AIR R C HEATING AND C C COOLING C R 1 2 R8222N1011 1 3 3 G C W1 R W2 Y1 RH RC Y2 M20170A Fig. 6. Hydronic heat with V8043 zone valves and air conditioning with dampers wiring diagram. 5 69-1344-1 W8703A DAMPER INTERFACE MODULE T8635L T8635L C7089B OUTDOOR TEMPERATURE SENSOR OT 1 OT 2 OT 3 T8635L OT 1 2 OT 3 OT 1 2 3 OPEN CLOSE Zone B Open OPEN CLOSE Zone C Open OPEN CLOSE 1 ZONE B Zone A Open 1 2 ZONE C R8222N1011 RELAYS FOR EACH CIRCULATOR ZONE A W8703A TR1 TR2 3 L1 (HOT) L2 COM EXTERNAL 40 VA TRANSFORMER T BOILER T C1 C2 C3 W8635A R8222N1011 1 3 1 120 LINE VOLTAGE 2 3 G L2 L1 (HOT) SYSTEM TRANSFORMER 1 C W1 R W2 Y1 RH RC Y2 USE ENCLOSURE AND WIRE FOLLOWING LOCAL CODES AND ORDINANCES. M20168A Fig. 7. Hydronic heat with circulator relays and no air conditioning wiring diagram. 69-1344-1 6 W8703A DAMPER INTERFACE MODULE T8635L T8635L C7089B OUTDOOR TEMPERATURE SENSOR OT 1 OT 2 OT 3 T8635L OT 1 2 OT 3 OT 1 2 3 OPEN CLOSE Zone B Open OPEN CLOSE Zone C Open OPEN CLOSE 1 ZONE B Zone A Open 1 2 ZONE C R8222N1011 RELAYS FOR EACH CIRCULATOR ZONE A W8703A TR1 TR2 3 L1 (HOT) L2 COM EXTERNAL 40 VA TRANSFORMER T BOILER T C1 C2 C3 W8635A FORCED AIR R C HEATING AND C C COOLING C R 1 120 LINE VOLTAGE 2 R8222N1011 1 3 3 G C W1 R W2 Y1 RH RC Y2 M20249A 1 USE ENCLOSURE AND WIRE FOLLOWING LOCAL CODES AND ORDINANCES. Fig. 8. Hydronic heat with circulators and non-zoned air conditioning wiring diagram. 7 69-1344-1 W8703A DAMPER INTERFACE MODULE T8635L T8635L C7089B OUTDOOR TEMPERATURE SENSOR OT OT 1 2 OT 3 T8635L OT 1 2 OT 3 1 OT 2 3 OPEN CLOSE Zone B Open OPEN CLOSE Zone C Open OPEN CLOSE 1 ZONE B Zone A Open 1 2 ZONE C R8222N1011 RELAYS FOR EACH CIRCULATOR ZONE A W8703A TR1 TR2 3 L1 (HOT) L2 COM EXTERNAL 40 VA TRANSFORMER T BOILER T C1 C2 C3 ARD ARD ARD 120 LINE VOLTAGE W8635A FORCED AIR R C HEATING AND C C COOLING C R 1 2 R8222N1011 1 3 3 G C W1 R W2 Y1 RH RC Y2 M20167A 1 USE ENCLOSURE AND WIRE FOLLOWING LOCAL CODES AND ORDINANCES. Fig. 9. Hydronic heat with circulators and air conditioning zoned with dampers wiring diagram. 69-1344-1 8 W8703A DAMPER INTERFACE MODULE T8635L T8635L C7089B OUTDOOR TEMPERATURE SENSOR OT OT 1 2 OT 3 T8635L OT 1 2 OT 3 OT 1 2 3 V8043F TR W8703A TH TH-TR CLOSE TH END SWITCH TH-TR OPEN CLOSE V8043F TR END SWITCH OPEN CLOSE TH 1 ZONE B OPEN TR ZONE A V8043F 2 ZONE C END SWITCH TR1 TR2 3 L1 (HOT) L2 COM EXTERNAL 40 VA TRANSFORMER TH-TR T BOILER T IWH AQUASTAT T T YELLOW YELLOW RA889A R(T) L1 W(T) L2 IWH V8044 VALVE C COM N.C. X1 X2 120 VAC W8635A FORCED AIR R C HEATING AND C C COOLING C R 1 2 R8222N1011 1 3 3 G C W1 R W2 Y1 RH RC Y2 M20169A Fig. 10. Hydronic heat with V8043 zone valves and indirect water heater wiring diagram. 9 69-1344-1 W8703A DAMPER INTERFACE MODULE T8635L T8635L C7089B OUTDOOR TEMPERATURE SENSOR OT OT 2 1 OT 3 T8635L OT 1 2 OT 3 OT 1 2 3 V8043F TR W8703A TH TH-TR CLOSE END SWITCH TH TH-TR OPEN CLOSE V8043F TR END SWITCH OPEN CLOSE TH 1 ZONE B OPEN TR ZONE A V8043F 2 ZONE C END SWITCH TR1 TR2 3 L1 (HOT) L2 COM EXTERNAL 40 VA TRANSFORMER TH-TR T BOILER T IWH AQUASTAT MODEL PMT-40 24 VAC TRANSFORMER T IWH V8044 VALVE LINE VOLTAGE T YELLOW YELLOW DELAY ON BREAK TIMER, SET FOR 30 MINUTES SENSE NC SENSE COM W8635A R8222N1011 1 3 1 2 3 G L2 L1 (HOT) C W1 R W2 Y1 RH RC Y2 SYSTEM TRANSFORMER M20250A Fig. 11. Hydronic heat with time-out and indirect water heater with no air conditioning wiring diagram. Wiring W8703 For Hot Water Zoning Hydronic Zone Applications Networked zoning can be used to control hydronic systems with or without ducted air conditioning systems. The damper interface module controls a 24 Vac zone valve directly or a 120 Vac circulator using isolation relays. 69-1344-1 HYDRONIC ZONING WITH ZONE VALVES Networked Zoning can control a hydronic system using Honeywell V8043 or similar zone valves. The zone valve end switches are wired in parallel and connected to the Aquastat on the boiler. A relay is used to prevent the dampers from opening when the heating system is idle. See Fig. 5. In a ducted air conditioning system, dampers are connected as shown in Fig. 6. Power closed, spring open, round ARD or rectangular ZD dampers are recommended. Three-wire, power open/power closed dampers such as the AOBD are wired as follows: 10 W8703A DAMPER INTERFACE MODULE * The first W8703 Damper Interface Module drives the zone valves using its open contacts. * The second W8703 Damper Interface Module, addressed with the same DIP switch settings as the first W8703 (Fig. 12-14) drives the AOBD damper. * AOBD dampers open and close on a call for heat and on a call for cool. An optional isolation relay can be used to depower the common wire to the second W8703 to prevent a call for heat from the operating damper on a call for heat. Wire the coil to Y1 and C on the W8635A. NOTE: The transformer must be appropriately sized to supply power to the total valve load (60 VA maximum or 30 VA maximum valve load per zone). HYDRONIC ZONING WITH CIRCULATORS Networked zoning can control a hydronic system zoned with circulators. The damper module damper terminals are wired to isolation relays that control the 120 Vac circuator. See Fig. 8. If the system uses ducted air conditioning, wire using Fig. 9. SETTINGS T8635 Thermostat Settings The T8635 Thermostats must be configured using Installer Setup. See Installer Setup 51 in Table 6 of the T8635 Thermostat Installation Instructions. Set Installer Setup 51 for the correct cycle rate. Use 6 cph for conventional forced air. Use 3 cph for high-efficiency forced air or hydronic applications. Set Installer Setup 5 to the number of stages of heat. For example, set to 1 for a single-stage heat system. Set Installer Setup 8 for the number of stages of cooling. For example, for one stage of cooling, set it to 1. For a heat only application, set it to 0. W8703 DIP Switch Settings Zones a, b, and c on the W8703 correspond with the thermostat configuration zones 1, 2, and 3, respectively. DIP switches are set in the factory as shown in Fig. 12. PRIORITY ZONING When an indirect water heater (IWH) is used, the domestic water can be put on a priority zone. This directs all the available heat from the boiler to the IWH, if present, when a call for domestic hot water occurs. Fig. 10 shows an isolation relay used to remove power from the room-heating zones valves whenever the IWH Aquastat calls for heat. In addition to powering the isolation relay, the IWH Aquastat also powers the zone valve for the IWH loop. Fig. 11 shows a method of adding a time-out feature to Fig. 10. This feature prevents the Aquastat from stealing the heat for extended periods. 1 0 ZONES 1-3 M13428 Fig. 12. Zones 1-3 DIP switch settings. When two W8703 are connected and the DIP switch is configured on the second module as shown in Fig. 13, zones a, b, and c on the W8703 correspond with the thermostat configuration zones 4, 5, and 6, respectively . 1 RELAY AND BOILER CONTROL PANELS Networked zoning can control Honeywell zone valve or circular panels. Wire similar to Fig. 7 but wire the normally open contacts on the circulator relays to zone thermostat R or W contacts on the panel. On Argo or Taco panels, connect the normally open contacts to the TT terminals on the panel. On Tekmar panels, connect the normally open contacts where the end switches or thermostats are shown in the Tekmar installation instructions. 0 ZONES 4-6 M20252 Fig. 13. Zones 4-6 DIP switch settings. When three W8703 are connected and the DIP switch is configured on the third module as shown in Fig. 14, zones a, b, and c on the W8703 correspond with the thermostat configuration zones 7,8 and 9, respectively. 1 0 ZONES 7-9 M20253 Fig. 14. Zones 7-9 DIP switch settings. 11 69-1344-1 W8703A DAMPER INTERFACE MODULE LED Indicators There are four LED on the W8703A used to indicate damper position and system communications. DAMPER POSITION LED Three two-color LED on the left side of the base are red when the W8703A is commanding the damper closed, and green when commanding the damper open. COMMUNICATION LED One green LED on the right side of the base flashes periodically to indicate that system communications are functional. CHECKOUT AND TEST When power is initially applied to the W8703A, the connected dampers are in the Open position. To test for proper wiring of the W8703A and the associated zone dampers: 1. Make sure that the zone thermostats are not calling for heating or cooling and that the thermostat Fan setting is in the Auto position. All heating and cooling equipment, including the system fan, should be off. All zone dampers should be in the Open position (status LED green). 2. Initiate a call for heating or cooling on the Zone 1 thermostat. The system should start, the Zone 1 damper should remain open and all other dampers should close. 3. Initiate the same call in each of the remaining zone thermostats. The damper in each zone should open in response to this action. 4. Remove the call for heating or cooling in each thermostat. The damper in each zone should close in response to this action. 5. After all calls for heating and cooling are removed, the system blower should stop and all dampers should return to the Open position. TROUBLESHOOTING GUIDE Symptom Possible Cause Action No LED are on. Panel is not powered. Check for 24 Vac between TR1 and TR2 terminals; if missing 24 Vac: -- Check if the circuit breaker is tripped; if so, reset the circuit breaker. -- Check if the Power switch on the HVAC equipment is in the Off position; if so, set to the On position. -- Check wiring between the thermostat and HVAC equipment-- replace any broken wires and tighten any loose connections. -- If 24 Vac is present, proceed with troubleshooting. Damper does not open/close when expected. System communications are incorrectly connected. Verify that system communications LED is periodically blinking; if not: -- Check wiring of system. Verify that system terminals 1, 2 and 3 are correctly connected. Damper is incorrectly connected to Damper Interface Module. Verify correct color of LED is visible: red for Closed and green for Open; if correct: -- Check wiring of damper. Verify that Open, Close and Com terminals are correctly connected to damper terminals. $WXRPDWLRQDQG&RQWURO6ROXWLRQV +RQH\ZHOO +RQH\ZHOO/LPLWHG+RQH\ZHOO/LPLWpH 'RXJODV'ULYH1RUWK '\QDPLF'ULYH *ROGHQ9DOOH\01 6FDUERURXJK2QWDULR 0+1 69-1344-1 G.H. Rev. 1-02 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. www.honeywell.com/yourhome