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Honeywell W8635A Installation Instructions Manual

Equipment interface module
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APPLICATION
The W8635A Equipment Interface Module (EIM) pro-
vides 24 Vac control of single or multistage conventional
HVAC equipment when used with a T8635L Microelec-
Model
Application
W8635A
Conventional gas, oil
or electric heat
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
these instructions can damage the product or
cause a hazardous 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 completing installation, use these instructions
to check out the product operation.
CAUTION
Voltage Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power before supply before beginning
installation.
Location
CAUTION
Mounting Location Hazard.
Mounting W8635A inside HVAC equipment
can damage the EIM.
Mount the W8635A only on the outside of HVAC
equipment.
® U.S. Registered Trademark
Copyright © 2000 Honeywell Inc. •
Equipment Interface Module
Table 1. Description.
Stages
Terminals
Up to 2 heat/
1, 2, 3, C, R, Rh, Rc,
2 cool
G, W1, W2, Y1, Y2
• All Rights Reserved
INSTALLATION INSTRUCTIONS
tronic Communicating Programmable Thermostat. The
W8635A can be used with up to 2 heat/2 cool conven-
tional applications. See Table 1.
Use with T8635L Communicating
Thermostat
1.
Locate the W8635A in the equipment room near
the HVAC equipment. See Fig. 1.
W8635
POSSIBLE
MOUNTING
LOCATION
FURNACE OR BOILER
Fig. 1. Selecting W8635A Equipment
Interface Module location.
2. Remove the cover from the W8635A by pulling on
the edge of the module.
3. Locate the two mounting holes. See Fig. 2.
W8635A
Comments
W8635
POSSIBLE
MOUNTING
LOCATION
M16637A
WATER HEATER
69- 1339- 2

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Summary of Contents for Honeywell W8635A

  • Page 1 INSTALLATION INSTRUCTIONS APPLICATION tronic Communicating Programmable Thermostat. The W8635A can be used with up to 2 heat/2 cool conven- tional applications. See Table 1. The W8635A Equipment Interface Module (EIM) pro- vides 24 Vac control of single or multistage conventional HVAC equipment when used with a T8635L Microelec- Table 1.
  • Page 2 Fig. 2. Mounting W8635A 24 Vac System Transformer Equipment Interface Module. 24 Vac Heating Transformer 4. Position the W8635A on the wall or on the cold air 24 Vac Cooling Transformer return. 24 Vac Transformer Common 5. Level the W8635A for appearance only; the device Fan Relay functions properly even when not level.

  • Page 3: Discovery Mode

    When using the W8635A on an electric heat application, set the T8635L Thermostat Installer Setup No. 4 to 1. For configuration combinations, see Table 3. This instructs the W8635A EIM to energize the fan with any call for heat. 69-1339—2...

  • Page 4: Installer System Test

    INSTALLER SYSTEM TEST M10345A Fig. 7. LCD segments display. Use the Installer System Test to check the thermostat and W8635A EIM operation for each thermostat in the system. Table 5 lists the available system tests. Table 5. Installer System Tests. Test Number...

  • Page 5: Troubleshooting Guide

    W8635A EQUIPMENT INTERFACE MODULE Table 6. Installer System Test Options. (Continued) Key to Press Test Number Description Fan and Damper Test (Damper Test available only when using W8703A) Enter Fan and Damper test. Fan turns on; damper for this zone opens.
  • Page 6 Communication is not being End and repeat the call for heat. Check the Flash COM on. System on indicator completed. OK LED on the W8635A EIM while the call is being made. = heat) displays. Heat load at W8635A is not If the Flash COM OK LED does not blink: connected correctly.