Honeywell CT8775A Benutzerhandbuch

5

69-1676—1

If you are replacing a thermostat that is connected to three wires on a warm air heating only system and could turn the 
fan on by setting the thermostat fan switch to ON, the CT8775C Thermostat will work with your system. Continue with 
the installation at Step 4. If you purchased a CT8775A thermostat, return the product to the place of purchase. The 
CT8775A thermostat is not compatible with this application.  

If you are replacing a thermostat that is connected to three wires on a zoned hot water heating system, the 
CT8775A,C thermostats will only work if an isolation relay is installed. For details, call your local heating and/or cooling 
contractor.

❑

Disconnect the wires from the old thermostat. As you disconnect each wire, attach 
the enclosed labels with the old terminal designation. Wrap the wires around a 
pencil as shown to keep them from falling back into the wall.

❑

Remove cover from thermostat. Separate the wallplate from the 
thermostat by placing your thumb on the top between the 
wallplate and the thermostat and pulling the thermostat away from 
the wallplate. See the illustration at the right.

❑

The decorator cover plate and wallplate can be mounted directly 
on the wall or onto an electrical box.

❑

To mount directly to the wall, see Fig. 1.

❑

To mount onto an electrical box, see Fig. 2.

WIRES THROUGH

WALL OPENING

M5136

WALL PLATE

THERMOSTAT

COVER REMOVED

M19492