Honeywell T87K, T8775A, T87N, T8775C User Manual

T8775A,C The Digital Round

Non-Programmable

Thermostats

OWNER’S GUIDE

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™

(T8775C ONLY) SELECTS COOL/OFF/HEAT

(T8775C ONLY) SELECTS ON/AUTO

DISPLAYS ROOM OR SET TEMPERATURE

ROOM

SET

DISPLAYS AND ADJUSTS TEMPERATURE SETTING/TURNS BACKLIGHT ON

SHOWS THAT THE CURRENT ROOM TEMPERATURE IS DISPLAYED.

SHOWS THAT THE CURRENT TEMPERATURE SETTING IS DISPLAYED.

Fig. 1. T8775 Thermostat (features and operation).

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M19470

Setting SYSTEM and FAN Switches (T8775C only)

❑ System and Fan settings are controlled by using SYSTEM and

FAN switches located on the top of the thermostat (see Fig. 1).

IMPORTANT

SET THE SYSTEM SWITCH:

❑ Heat: The thermostat controls your heating system. ❑ Off: Both heating and cooling systems are off. ❑ Cool: The thermostat controls your cooling system.

SET THE FAN SWITCH:

❑ Auto: Normal setting for most homes. The fan only runs with

❑ On: The fan runs continuously. Use for improved air

Do not operate the T8775C in cooling mode when the outdoor temperature is below 50°F (10°C), or damage to compressor could result.

the heating and cooling system.

circulation.

Operating Your Thermostat

NOTE: Batteries are not required because the temperature set-

ting is held permanently in memory.

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Backlit Display

❑ The backlight can be turned on by turning the dial, or by

pushing the backlight button as shown in Fig. 1.

Display Temperature Setting

NOTE: Your temperature setting can be set anywhere from

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 (T8775C only)

❑ Turn the dial one click to display

the current temperature setting. A indicator points to Set when the temperature setting is displayed. If a change to the temperature setting is not made within five seconds, the mode will switch to the room temperature display.

❑ A indicator points to Room

when the room temperature is displayed.

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ROOM

SET

M19489

ROOM

SET

M19490

Adjust Temperature Setting

❑ To lower the temperature setting, turn the dial

counterclockwise.

❑ To raise the temperature setting, turn the dial clockwise.

Troubleshooting Guide

CAUTION

Equipment Damage Hazard. Can cause permanent damage to compressor or other equipment.

Do not operate cooling when outside temperature is below 50°F (10°C). Allow compressor to remain off for five minutes before restarting. See equipment manufacturer instructions.

Heating or cooling does not come on.

❑ Make sure that the SYSTEM switch on the thermostat is set to

Heat or Cool (T8775C only).

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