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W8635A EQUIPMENT INTERFACE MODULE
WALL
MOUNTING
HOLES (2)
Fig. 2. Mounting W8635A
Equipment Interface Module.
4. Position the W8635A on the wall or on the cold air
return.
5. Level the W8635A for appearance only; the device
functions properly even when not level.
6. Use a pencil to mark the position of the mounting
holes on the wall or cold air return.
7. Remove the W8635A 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.
8. When mounting on the cold air return, drill a pilot
hole where marked.
9. Gently tap the anchors (provided) into the holes
until flush with the wall.
10. Reposition the W8635A over the holes.
11. Loosely insert the screws into the holes and tighten
each screw.
WIRING
All wiring must comply with local electrical codes 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 equipment
damage.
Disconnect power before beginning installation.
1. Loosen the terminal screws on the W8635A and
connect the system wires. See Fig. 3.
2. Securely tighten each terminal screw.
69-1339—2
W8635
1
MOUNTING
G
2
SCREWS (2)
W 1
3
W 2
Y 1
C
Y 2
R
RH
RC
M16636
FOR STRAIGHT
CONNECTION—
STRIP 5/16 IN. (8 MM)
FOR WRAPAROUND
CONNECTION—
STRIP 7/16 IN. (11 MM)
Fig. 3. Wiring the W8635A terminals.
Table 2. Terminal Designations.
W8635A
Terminal
Designations
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
G
Fan 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
C7089B
OUTDOOR
TEMPERATURE
SENSOR
W8635A
L2
C
R
L1
R H
(HOT)
R C
SYSTEM
TRANSFORMER
1
1
FACTORY INSTALLER JUMPERS.
Fig. 4. 2H/2C single transformer.
2
W8635
M16639
Function
OT
OT
1
2
3
1
2
3
G
W1
W2
Y1
Y2
FAN
RELAY
HEAT 1
RELAY
HEAT 2
RELAY
COOL 1
RELAY
COOL 2
RELAY
M13429
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