Honeywell Digital Round T8775A, Installation Manual, Page: 3 / 12

T8775A,C THE DIGITAL ROUND™ NON-PROGRAMMABLE THERMOSTATS
3 69-1677ES—1
3 69-1677ES—1
CUSTOMIZE THERMOSTAT
Setting Fuel Switch (T8775C only)
The fuel switch is preset at the factory in the F
position. See Fig. 7. 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 setting allows the fan to turn on
immediately with the heating equipment in a system
where the G terminal is connected.
Fig. 7. Fuel switch.
DIP Switch
To adjust the heat cycle rate or the Fahrenheit/Celsius
indication, locate DIP switch 1, 2 and 3 on the back of
the thermostat. See Fig. 8.
Fig. 8. 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.
Fahrenheit/Celsius Indication
Use DIP switch 3 to set the desired temperature
indication. See Table 2.
Table 2. Temperature Indication.
Mounting Thermostat to Wallplate
Fig. 9. Mounting thermostat to wallplate.
OPERATION
Setting SYSTEM and FAN Switches
(T8775C only)
System and fan settings are controlled manually by
using the switches located at the top of the
thermostat. See Fig. 10.
M19497 FUEL SWITCH
ON
1
2
3
M19567
BACK OF THERMOSTAT
DIP SWITCH
Heating System
Cycles
Per
Hour
DIP
Switch
1
DIP
Switch
2
Steam, Gravity 1 On On
High Efficiency Warm Air
(90%+ efficiency), Hot Water,
Heat Pump 3 Off On
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.
Fahrenheit/Celsius
Display DIP Switch 3
Fahrenheit (factory setting) Off
Celsius
On
M19498
ENGAGE TABS
AT BOTTOM OF
THERMOSTAT
AND WALL PLATE.
PRESS UPPER
EDGE OF CASE
TO LATCH