Honeywell T8775A Installation Instructions

T8775A,C THE DIGITAL ROUND™ NON-PROGRAMMABLE THERMOSTATS
XX-XXXX—X 2
69-1677ES 2
Wiring
IMPORTANT
Use 18-gauge wire to wire the T8775A,C
Thermostats.
All wiring must comply with local electrical codes
and ordinances. Disconnect the power supply to
prevent electrical shock or equipment damage.
Refer to Fig. 2 through 6 for typical wiring hookups.
Fig. 2. Typical hookup of T8775A in a heat-only system.
Fig. 3. Typical hookup of T8775C in heat-only system
with fan.
Fig. 4. Typical hookup of T8775C in heat-cool system
with single transformer.
Fig. 5. Typical hookup of T8775C in heat-cool system
with two transformers.
Fig. 6. Typical hookup of T8775C in single-stage heat
pump system.
POWER SUPPLY. PROVIDE DISCONNECT MEAN
S
AND OVERLOAD PROTECTION AS REQUIRED.
W
R
HEATING
RELAY OR
VALVE COIL
M1951
3
1
1
M1951
4
HEATING
RELAY OR
VALVE COIL
FAN
RELAY
1 POWER SUPPLY. PROVIDE DISCONNECT MEAN
S
AND OVERLOAD PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER.
1
2
W
R
Rc
B
O
Y
G
1
HEATING
RELAY OR
VALVE COIL
COMPRESSOR
CONTACTOR
FAN
RELAY
M1951
5
1 POWER SUPPLY. PROVIDE DISCONNECT MEAN
S
AND OVERLOAD PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER.
2
W
R
Rc
B
O
Y
G
1
2
1
HEATING
RELAY OR
VALVE COIL
COMPRESSOR
CONTACTOR
FAN
RELAY
M1951
7
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
REMOVE FACTORY INSTALLED JUMPER BETWEEN R AND R
C
.
2
W
R
Rc
B
Y
G
1
4
COMPRESSOR
CONTACTOR
HEAT
CHANGEOVER
VALVE
COOL
CHANGEOVER
VALVE
FAN
RELAY
M1951
6
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER.
3 USE A JUMPER WIRE (NOT SUPPLIED) TO CONNECT W TO
Y.
4 USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.
3
2
W
R
Rc
B
O
Y
G

Honeywell T8775A Specifications

General

Brand	Honeywell
Model	T8775A
Category	Thermostat
Language	English