Honeywell CT3200 Step 2. Remove the old thermostat

4INSTALLATION 69-0653-6

Step 2. Remove the old thermostat

Fig. 2

Fig. 3

Fig. 4

WIRES THROUGH

WALL OPENING

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a. Turn off power to the heating/cooling system, either at the

furnace or at the fuse/circuit breaker panel.

b. Remove the cover of your old thermostat (Fig. 2).

c. Unscrew and remove the old thermostat’s mounting plate from

the wall, but do not disconnect the wires.

d. Inspect the old thermostat wiring. If the wiring meets any of

the following conditions, see the special wiring

instructions on page 9.

•The old thermostat is a clock thermostat with wires attached

to the C or C1 terminals.

•The old thermostat has 6 or more wires, excluding wires

attached to C or C1 terminals.

•The old thermostat has 3 wires.

•There are 5 wires connected to the old thermostat.

•There are extra wires that are not connected to the old

thermostat.

e. Using the enclosed labels, mark the wires with the letter of the

terminal that it is attached to on the old thermostat (Fig. 3). Do

not label the wires by color.

If the labels do not match the letters on the old thermostat

terminals, see the wiring cross reference table on page 10.

f. Disconnect the wires from the old thermostat and wrap the

wires around a pencil to keep them from falling back into the

wall.

Note: Remember, if your old thermostat contains mercury, you

must recycle it. See page 2 for more recycling information.

Your wall should now look like Fig. 4.

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