Honeywell t8775a,c User Manual

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69-1677EF—1

The T8775A,C Thermostats provide single-stage 
temperature control for 24V systems. The 
T8775A,C models include a thermostat, wallplate 
(for wiring and mounting thermostat), mounting 
screws, wall anchors, and a 4074 FAB resistor.   

If this control is replacing a control that 
contains mercury in a sealed tube, do not 
place your old control in the trash.

Contact your local waste management 
authority for instructions regarding 
recycling and the proper disposal of an old 
control containing mercury in a sealed 
tube.

1. Read these instructions carefully. Failure to 

follow them could damage the product or 
cause a hazardous condition.

2. Check the ratings given in the instructions 

and on the product to make sure the product 
is suitable for your application.

3. Installer must be a trained, experienced ser-

vice technician.

4. After installation is complete, check out prod-

uct operation as provided in these instruc-
tions.

Electrical Shock or Equipment Damage 
Hazard.
Can shock individuals or short 
equipment circuitry.
Disconnect power supply before 
installation.

Install the thermostat about 5 ft (1.5m) above the 
floor in an area with good air circulation at average 
temperature. Do not install the thermostat where it 
can be affected by:
— drafts or dead spots behind doors and in 

corners.

— hot or cold air from ducts.
— radiant heat from the sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside 

wall behind the thermostat.

Mount the T8775A,C wallplate, with the screws 
provided. See Fig. 1.

M19499

WALL ANCHORS (2)

WIRING HOLE

WALL PLATE

1 INCH SCREW (2)

1  WHEN USING WALL ANCHORS, DRILL 3/16 IN. HOLES
 

FOR DRYWALL, 7/32 IN. HOLES FOR PLASTER.

1