Honeywell T8775A specifications Customize Thermostat, DIP Switch, Setting Fuel Switch T8775C only

T8775A,C THE DIGITAL ROUND™ NON-PROGRAMMABLE THERMOSTATS

Rc	B
	G
2
	Y
R
	W

COMPRESSOR

CONTACTOR

	HEATING	FAN
1	RELAY OR	RELAY
	VALVE COIL

1

FUEL SWITCH M19497

Fig. 12. Fuel switch.

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

2REMOVE FACTORY INSTALLED JUMPER BETWEEN R AND RC.

M19517

Fig. 10. Typical hookup of T8775C in heat-cool system

with two transformers.

4

	O
	B
	Rc
2	G
	Y 3
R
	W

DIP Switch

To adjust the heat cycle rate or the Fahrenheit/Celsius temperature display, locate DIP switch 1, 2 and 3 on the back of the thermostat. See Fig. 13.

BACK OF THERMOSTAT

	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. 11. Typical hookup of T8775C in single-stage heat

pump system.

CUSTOMIZE THERMOSTAT

Setting Fuel Switch (T8775C only)

The fuel switch is preset at the factory in the F position. See Fig. 12. This is the correct setting for gas or oil systems. If the T8775C is being installed on an electric heat system, or a heat pump, set the switch to the E position. The E position allows the fan to turn on immediately with the heating equipment in a system where the G terminal is connected.

	3
	2
ON	1

M19567

DIP SWITCH

Fig. 13. DIP switch.

Set Heat Cycle Rate

Use DIP switches 1 and 2 to set the heat cycle rate. See Table 1.

Table 1. Heat Cycle Rate.

	Cycles	DIP	DIP
Heating System	Per	Switch	Switch
	Hour	1	2
Steam, Gravity	1	On	On
High Efficiency Warm Air (90%+	3	Off	On
efficiency), Hot Water, Heat Pump
Gas or Oil Warm Air (factory setting)	6	Off	Off
Electric Warm Air	9	On	Off
In Floor Radiant Heat	Check with manufacturer
	for recommended cycle
	rate.

5 68-0279