T8775A,C THE DIGITAL ROUND™ NON-PROGRAMMABLE THERMOSTATS
XX-XXXX—X 4
69-1677EF J.S. 6-03 Printed in Hungary www.honeywell.com/yourhome
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
Fig. 10. T8775 Thermostat (features and operation).
SYSTEM Switch
Heat: The thermostat controls the heating
system.
Off: Both heating and cooling systems are off.
Cool: The thermostat
controls the cooling
system.
FAN Switch
Auto: The fan only runs with the heating and
cooling system.
On: The fan runs continuously. Use for
improved air circulation.
CHECKOUT
NOTE: Temperature setpoint range is 40°F to 90°F
(4°C to 32°C) in heating and 45°F to 99°F
(7°C to 37°C) in cooling.
Heating
1. Slide the SYSTEM switch to Heat and the FAN
switch to Auto (T8775C only).
2. Raise the temperature setpoint several degrees
above the room temperature.
3. A flame will appear in the display and the
heat should turn on.
4. Lower the temperature setpoint below the room
temperature.
5. The flame will disappear from the display
and the heat should turn off.
Cooling (T8775C only)
CAUTION
Low Temperature Hazard.
Operating at too low of an outdoor
temperature may cause compressor
damage.
Do not operate cooling if outdoor temperature
is below 50°F (10°C). Refer to manufacturer’s
recommendations.
NOTE: If a call for cooling is made before the com-
pressor has been off for five minutes, or if a
power interruption occurs while the com-
pressor is running, the thermostat will go
into a five-minute delay to protect the com-
pressor. The snowflake will flash during
this delay.
1. Slide the SYSTEM switch to Cool and the FAN
switch to Auto.
2. Lower the temperature setpoint several
degrees below the room temperature.
3. After approximately five minutes, the thermo-
stat will display a solid snowflake and the
cooling should turn on.
4. Raise the temperature setpoint above the room
temperature.
5. The snowflake will disappear from the dis-
play and the cooling should turn off.
Fan
1. Slide the SYSTEM switch to Off and the FAN
switch to On. The fan should run continuously.
2. Slide the FAN switch to Auto. The fan should
turn off.
ROOM
SET
DISPLAYS ROOM
OR SET TEMPERATURE
M1952
SHOWS THAT THE
CURRENT TEMPERATURE
SETPOINT IS DISPLAYED.
(T8775C ONLY)
SELECTS
ON/AUTO
(T8775C ONLY)
SELECTS
COOL/OFF/HEAT
DISPLAYS AND ADJUSTS
TEMPERATURE SETPOINT/TURNS
SHOWS THAT THE
CURRENT ROOM
TEMPERATURE IS
DISPLAYED.
(44 pages)
(72 pages)
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