Customize Thermostat - Honeywell Digital Round T8775A Product Data

B
Rc
G
2
Y
R
W
HEATING
RELAY OR
1
VALVE COIL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
REMOVE FACTORY INSTALLED JUMPER BETWEEN R AND R C .
2
Fig. 10. Typical hookup of T8775C in heat-cool system
with two transformers.
4
O
B
Rc
G
2
Y
3
R
W
COMPRESSOR
CONTACTOR
1
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.
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.
T8775A,C THE DIGITAL ROUND
COMPRESSOR
CONTACTOR
FAN
RELAY
1
M19517
HEAT
CHANGEOVER
VALVE
COOL
FAN
CHANGEOVER
RELAY
VALVE
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.
Set Heat Cycle Rate
M19516
Use DIP switches 1 and 2 to set the heat cycle rate. See
Table 1.
Heating System
Steam, Gravity
High Efficiency Warm Air (90%+
efficiency), Hot Water, Heat Pump
Gas or Oil Warm Air (factory setting)
Electric Warm Air
In Floor Radiant Heat
5
™
NON-PROGRAMMABLE THERMOSTATS
FUEL SWITCH M19497
Fig. 12. Fuel switch.
BACK OF THERMOSTAT
DIP SWITCH
Fig. 13. DIP switch.
Table 1. Heat Cycle Rate.
Cycles
Per
Hour
1
3
6
9
Check with manufacturer
for recommended cycle
rate.
M19567
DIP DIP
Switch Switch
1 2
On On
Off On
Off Off
On Off
68-0279