Honeywell T8775C Wiring, Use 18-gauge wire to wire the T8775A,C Thermostats

T8775A,C THE DIGITAL ROUND™ NON-PROGRAMMABLE THERMOSTATS

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.

	R
	W
1	HEATING
	RELAY OR
	VALVE COIL

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

M19513

Fig. 2. Typical hookup of T8775A in a heat-only system.

	O
	B
2	Rc
	G
R	Y
	W

1	HEATING	FAN
	RELAY OR
	VALVE COIL	RELAY

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2 FACTORY INSTALLED JUMPER. M19514

Fig. 3. Typical hookup of T8775C in heat-only system

with fan.

69-1677EF 2

	O
	B
2	Rc
	G
R	Y
	W

1	HEATING	COMPRESSOR	FAN
	RELAY OR	CONTACTOR	RELAY
	VALVE COIL
	1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
	AND OVERLOAD PROTECTION AS REQUIRED.

2 FACTORY INSTALLED JUMPER. M19515

Fig. 4. Typical hookup of T8775C in heat-cool system

with single transformer.

Rc	B
	G
2
	Y
R
	W

		COMPRESSOR
		CONTACTOR
	HEATING	FAN
1	RELAY OR	RELAY	1
	VALVE COIL

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2REMOVE FACTORY INSTALLED JUMPER BETWEEN R AND RC.

M19517

Fig. 5. Typical hookup of T8775C in heat-cool system

with two transformers.

	4
	O
	B
	Rc
2	G
	Y 3
R
	W
	COMPRESSOR	HEAT
		CHANGEOVER
	CONTACTOR
		VALVE

1	FAN	COOL
	RELAY	CHANGEOVER
		VALVE
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.
		M19516

Fig. 6. Typical hookup of T8775C in single-stage heat

pump system.