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® U.S. Registered Trademark
Copyright © 2002 Honeywell •                •  All Rights Reserved 

INSTALLATION INSTRUCTIONS

69-1344-1

W8703A

 Damper Interface Module

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 low-

cost wired communications protocol.

Using the W8703A Damper Interface Module with up to 
three T8635L Microelectronic Communicating Program-

mable Thermostats and a W8635A,B Equipment 
Interface Module enables the following features:

• Time synchronization.

• Shared filter indication.

• 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:

—

Up to three T8635 Thermostats can be con-

trolled with the W8703A Damper Interface 
Module. 

—

Up to six zones can be controlled using two 
W8703A and up to nine zones can be con-

trolled using three W8703A.

Table 1. W8703A Description.

Required Accessories

1.

T8635L Microelectronic Communicating Pro-

grammable Thermostat.

2.

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.

Read these instructions carefully. Failure to follow 
them could damage the product or cause a haz-

ardous condition.

2.

Check the ratings given in the instructions and on 

the product to make sure the product is suitable 
for your application.

3.

Installer must be a trained, experienced service 

technician.

4.

After installation is complete, check out product 

operation as provided in these instructions.

5.

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.

Model

Application

Recommended Zone Dampers

Comments

W8703A

Controls up to 
three zone 

dampers.

Trol-A-Temp

 Model AOBD

or

Trol-A-Temp

 Model ARD

or

Trol-A-Temp

 Model ZD

Use with T8635L Microelectronic 
Communicating Programmable 

Thermostat and W8635A,B Equipment 
Interface Modules.

Содержание W8703A

Страница 1: ... using two W8703A and up to nine zones can be con trolled using three W8703A Table 1 W8703A Description Required Accessories 1 T8635L Microelectronic Communicating Pro grammable Thermostat 2 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 Read these in...

Страница 2: ...r 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 Voltage Hazard Can cause electrical shock or equipm...

Страница 3: ... nal 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 Fig 4 T8635L W8703A W8635A wiring diagram W8703A Terminal Designations Function 1 To communications bus 2 To communications bus 3 To communications bus TR1 To external 24 Vac transformer to power zone...

Страница 4: ...1 HOT L2 SYSTEM TRANSFORMER W8635A C R RH RC 1 2 3 Y2 W2 Y1 G W1 W8703A L1 HOT L2 EXTERNAL 40 VA TRANSFORMER ZONE A ZONE B ZONE C CLOSE OPEN OPEN CLOSE OPEN CLOSE COM TR1 TR2 2 3 1 V8043F END SWITCH TH TR TH TR BOILER 1 3 V8043F END SWITCH TH TR TH TR OT OT 2 1 3 C7089B OUTDOOR TEMPERATURE SENSOR T8635L OT OT 2 1 3 T8635L OT OT 2 1 3 T8635L M20251A R8222N1011 T T ...

Страница 5: ... RC 1 2 3 Y2 W2 Y1 G W1 W8703A L1 HOT L2 EXTERNAL 40 VA TRANSFORMER ZONE A ZONE B ZONE C CLOSE OPEN OPEN CLOSE OPEN CLOSE COM TR1 TR2 2 3 1 V8043F END SWITCH TH TR TH TR BOILER 1 3 V8043F END SWITCH TH TR ARD TH TR OT OT 2 1 3 C7089B OUTDOOR TEMPERATURE SENSOR T8635L OT OT 2 1 3 T8635L OT OT 2 1 3 T8635L M20170A R8222N1011 FORCED AIR HEATING AND COOLING T T ARD ARD R C R C C C ...

Страница 6: ...NSFORMER ZONE A ZONE B ZONE C CLOSE OPEN OPEN CLOSE OPEN CLOSE COM TR1 TR2 2 3 1 1 3 OT OT 2 1 3 C7089B OUTDOOR TEMPERATURE SENSOR T8635L OT OT 2 1 3 T8635L OT OT 2 1 3 T8635L R8222N1011 M20168A Zone B Open Zone A Open Zone C Open R8222N1011 RELAYS FOR EACH CIRCULATOR BOILER T T C1 C2 C3 120 LINE VOLTAGE USE ENCLOSURE AND WIRE FOLLOWING LOCAL CODES AND ORDINANCES 1 1 L1 HOT L2 SYSTEM TRANSFORMER ...

Страница 7: ...ER ZONE A ZONE B ZONE C CLOSE OPEN OPEN CLOSE OPEN CLOSE COM TR1 TR2 2 3 1 1 3 OT OT 2 1 3 C7089B OUTDOOR TEMPERATURE SENSOR T8635L OT OT 2 1 3 T8635L OT OT 2 1 3 T8635L R8222N1011 M20249A Zone B Open Zone A Open Zone C Open R8222N1011 RELAYS FOR EACH CIRCULATOR BOILER T T C1 C2 C3 120 LINE VOLTAGE FORCED AIR HEATING AND COOLING R C R C C C USE ENCLOSURE AND WIRE FOLLOWING LOCAL CODES AND ORDINANC...

Страница 8: ... ZONE A ZONE B ZONE C CLOSE OPEN OPEN CLOSE OPEN CLOSE COM TR1 TR2 2 3 1 1 3 OT OT 2 1 3 C7089B OUTDOOR TEMPERATURE SENSOR T8635L OT OT 2 1 3 T8635L OT OT 2 1 3 T8635L R8222N1011 M20167A Zone B Open Zone A Open Zone C Open R8222N1011 RELAYS FOR EACH CIRCULATOR BOILER T T C1 C2 C3 120 LINE VOLTAGE ARD ARD ARD USE ENCLOSURE AND WIRE FOLLOWING LOCAL CODES AND ORDINANCES 1 1 FORCED AIR HEATING AND COO...

Страница 9: ...TERNAL 40 VA TRANSFORMER ZONE A ZONE B ZONE C CLOSE OPEN OPEN CLOSE OPEN CLOSE COM TR1 TR2 2 3 1 V8043F END SWITCH TH TR TH TR BOILER 1 3 V8043F END SWITCH TH TR TH TR OT OT 2 1 3 C7089B OUTDOOR TEMPERATURE SENSOR T8635L OT OT 2 1 3 T8635L OT OT 2 1 3 T8635L M20169A R8222N1011 T T RA889A 120 VAC X2 X1 N C COM L2 L1 W T R T C T T IWH AQUASTAT YELLOW YELLOW IWH V8044 VALVE FORCED AIR HEATING AND COO...

Страница 10: ... to prevent the dampers from opening when the heating system is idle See Fig 5 In a ducted air conditioning system dampers are con nected as shown in Fig 6 Power closed spring open round ARD or rectangular ZD dampers are recom mended Three wire power open power closed dampers such as the AOBD are wired as follows V8043F END SWITCH TH TR TH TR L1 HOT L2 SYSTEM TRANSFORMER W8635A C R RH RC 1 2 3 Y2 ...

Страница 11: ...orked zoning can control Honeywell zone valve or circular panels Wire similar to Fig 7 but wire the nor mally 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 Tekma...

Страница 12: ...hould start the Zone 1 damper should remain open and all other damp ers 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 sys...

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