Honeywell W8635A User Manual
W8635A
Equipment Interface Module
INSTALLATION INSTRUCTIONS
APPLICATION
The W8635A Equipment Interface Module (EIM) provides 24 Vac control of single or multistage conventional
HVAC equipment when used with a T8635L Microelec-
Table 1. Description.
Model Application Stages Terminals Comments
W8635A Conventional gas, oil
or electric heat
Up to 2 heat/
2 cool
INSTALLATION
tronic Communicating Programmable Thermostat. The
W8635A can be used w ith up to 2 heat/2 cool conventional applications. See Table 1.
1, 2, 3, C, R, Rh, Rc,
G, W1, W2, Y1, Y2
1.
Use with T8635L Communicating
Thermostat
Locate the W8635A in the equipment room near
the HVAC equipment. See Fig. 1.
When Installing this Product…
Read these instructions carefully. Failure to follow
1.
these instructions can damage the product or
cause a hazardous condition.
Check the ratings given in the instructions and on
2.
the product to make sure the product is suitable for
your application.
Installer must be a trained, experienced service
3.
technician.
After completing installation, use these instructions
4.
to check out the product operation.
W8635
CAUTION
Voltage Hazard.
Can cause electrical shock or equ ip m ent
damage.
Disconnect power before supply before beginning
installation.
POSSIBLE
MOUNTING
LOCATION
W8635
POSSIBLE
MOUNTING
LOCATION
Location
CAUTION
Mounting Location Hazard.
Mounting W8635A inside HVAC equipment
can damage the EIM.
Mount the W8635A only on the outside of HVAC
equipment.
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Copyright © 2000 Honeywell Inc. • • All Rights Reserved
FURNACE OR BOILER
Fig. 1. Selecting W8635A Equipm ent
Interface Module location.
Remove the cover from the W8635A by pulling on
2.
the edge of the module.
Locate the two mounting holes. See Fig. 2.
3.
WATER HEATER
M16637A
69-1339- 2
W8635A EQUIPMENT INTERFACE MODULE
FOR WRAPAROUND
CONNECTION—
STRIP 7/16 IN. (11 MM)
FOR STRAIGHT
CONNECTION—
STRIP 5/16 IN. (8 MM)
M16639
W8635
WALL
W8635
MOUNTING
HOLES (2)
Fig. 2. Mounting W8635A
Equipment Interface Modul e.
Position the W8635A on the wall or on the cold air
4.
return.
Level the W8635A for appearance only; the device
5.
functions properly even when not level.
Use a pencil to mark the position of the mounting
6.
holes on the wall or cold air return.
Remove the W8635A from the wall or cold air
7.
return and drill 3/ 1 6 in . ho l e s in th e wall (if drywall)
where marked. For firmer materials such as plaster
or wood, drill 7/32 in. holes.
When mounting on the cold air return, drill a pilot
8.
hole where marked.
Gently tap the anchors (provided) into the holes
9.
until flush with the w all.
Reposition the W8635A over the holes.
10.
Loosely insert the screws into the holes and tighten
11.
each screw.
WIRING
All wiring must comply with local electrical code s and
ordinances. See Fig. 4 through 6 wiring diagrams for
specific equipment applications. Refer to Table 2 for
terminal designations.
CAUTION
Voltage Hazard.
Can cause electrical shock or equ ip m ent
damage.
Disconnect power before beginning installation.
Loosen the terminal screws on the W8635A and
1.
connect the system wires. See Fig.3.
Securely tighten each terminal screw.
2.
1
2
3
C
R
R
H
R
C
G
W
W
Y1
Y2
1
2
MOUNTING
SCREWS (2)
M16636
Fig. 3. Wiring the W8635A terminals.
Table 2. Terminal Designations.
W8635A
Terminal
Designations Function
1 To Communicating Thermostat
Terminal 1
2 To Communicating Thermostat
Terminal 2
3 To Communicating Thermostat
Terminal 3
R 24 Vac System Transformer
Rh 24 Vac Heating Transformer
Rc 24 Vac Cooling Transformer
C 24 Vac Transformer Common
GFan Relay
W1 Stage 1 Heat Relay
W2 Stage 2 Heat Relay
Y1 Stage 1 Cool Relay
Y2 Stage 2 Cool Relay
Green LED Indicates Data Communication
T8635L
OT
OT
W8635A
1
2
3
C
R
R
H
R
C
1
FACTORY INSTALLER JUMPERS.
1
G
W1
W2
Y1
Y2
L2
L1
(HOT)
SYSTEM
TRANSFORMER
C7089B
OUTDOOR
TEMPERATURE
SENSOR
1
Fig. 4. 2H/2C single transformer.
69-1339—22
2
3
FAN
RELAY
HEAT 1
RELAY
HEAT 2
RELAY
COOL 1
RELAY
COOL 2
RELAY
M13429
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