Honeywell T8635L Installation Instructions Manual page 3

CAUTION
Voltage Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power before beginning installation.
1. Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 3 and 4.
IMPORTANT
Use 18-gauge color-coded thermostat cable for
proper wiring. Shielded cable is not required.
2. Securely tighten each terminal screw.
3. Push excess wire back in the hole.
4. Plug the hole in the wall with non-flammable insu-
lation to help prevent drafts from adversely affect-
ing thermostat operation.
T8635L Terminal Designations
1
2
3
OT
OT
a
Use optional C7089B Outdoor Temperature Sensor.
T8635L
C7089B
OUTDOOR
TEMPERATURE
SENSOR
W8635A
L2
C
R
L1 R H
(HOT)
R C
SYSTEM
TRANSFORMER
1
1
FACTORY INSTALLER JUMPERS.
Fig. 5. T8635L/W8635A with
Outdoor Temperature Sensor.
T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT
Table 2. Terminal Designations.
Data – Connect to terminal 1 on W8835 or W8635.
Power – Connect to terminal 2 on W8835 or W8635.
Power – Connect to terminal 3 on W8835 or W8635.
Outdoor Temperature Sensor
Outdoor Temperature Sensor
2
OT OT 1 3
1
2
3
G
W1
W2
Y1
Y2
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
Fig. 3. Correct wiring technique.
Fig. 4. Using wire nut to pigtail a
connection when three or more wires
Function
a
a
C7089B
OUTDOOR
TEMPERATURE
SENSOR
FAN
RELAY
HEAT 1
RELAY
L2
HEAT 2
RELAY
L1
COOL 1
(HOT)
RELAY
SYSTEM
TRANSFORMER
COOL 2
RELAY
1
M13429
1
3
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM).
WIRE NUT
are terminated at one terminal.
T8635L
OT 1
OT
W8635B
1
2
L
3
G
C W1/Y1
R
AUX
E
R H
O
B
FACTORY INSTALLER JUMPER.
Fig. 6. T8635L/W8635B with
Outdoor Temperature Sensor.
M4826
M13378
2
3
COMPRESSOR
MONITOR
FAN
RELAY
COMP.
RELAY
AUX. HT.
RELAY
EM. HT.
RELAY
COOL
CHANGE-
OVER
HEAT
CHANGE-
OVER
M13431
69-1331—5