Honeywell CT8602 STEP 2. REMOVE OLD THERMOSTAT

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STEP 2. REMOVE OLD THERMOSTAT

❑Test your heating and cooling systems to make sure they work properly. If either system does not work, contact

your local heating/air-conditioning dealer. To avoid compressor damage, do not operate the cooling system when

outdoor temperature is below 50°F (10°C).

❑Turn off power to the system at the furnace or the fuse/circuit breaker panel.

❑Carefully unpack your new thermostat and wallplate. Save package of screws, instructions, and receipt.

❑Remove the cover from the old thermostat. If the cover does not snap off when pulled firmly from the bottom, check

for a screw or screws used to lock on the cover.

❑Loosen the screw or screws holding the thermostat to the wallplate and lift the thermostat away.

❑Disconnect the wires from the old thermostat. As you disconnect each wire, attach the enclosed labels with the old

terminal designation. If there are only two wires, they do not need to be labeled. Wrap the wires around a pencil as

shown to keep them from falling back into the wall.

Read this section if you are replacing:

• Clock thermostat with separate wires for the clock.

• Thermostat with six or more wires connected to it.

• Thermostat in a heating only system with three wires.

If you are replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires going to the C or C1 clock

terminals on the Chronotherm wiring wallplate. Do not allow them to touch, or you can damage the transformer.

Disconnect the wires and wrap them separately using electrical tape. Do not wrap them together. Place the wires

where they will not interfere with the operation of the new thermostat. Record the colors and terminal designation

labels of the remaining wires.

If there are six or more wires (excluding clock wires attached to terminals), you probably have a variation of a

multistage heat pump or other multistage system. This thermostat is not compatible with multistage systems, so return

the product to the place of purchase. If you have questions regarding this thermostat please visit our web site at

www.honeywell.com/yourhome, or call the 24-hour automated information line at 1-800-468-1502.

If you have three wires for a heating only system and can operate the fan using the fan ON switch this thermostat works

with your system. However, some hot water (zoned) heating systems also have three wires. Your thermostat will work

only if you install an isolating relay on these systems. For details, call your loc al heating and/or cooling contractor.

WIRES THROUG

WALL OPENING

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