Honeywell CT87K1004/E1 Round Heat Only Thermostat

Remove your old thermostat

1. CAUTION TURN OFF POWER to system at the furnace, or at the fuse/circuit breaker panel before you begin.

2. Remove cover and thermostat, but leave wallplate with wires attached.

Leave wallplate in place.

MERCURY NOTICE If your old thermostat contains mercury, contact your local waste management authority for proper disposal instructions.

Label wires and remove old wallplate

Use a screwdriver to disconnect wires one by one. As you disconnect each wire, wrap it with the label matching the letter on your old thermostat. (Adhesive labels are supplied in your thermostat package.)

Remove the old wallplate only after all wires are labeled. Be careful not to let loose wires fall into the wall opening.

If your old thermostat has 4 or more wires (not counting terminals C or C1), you may have purchased the wrong replacement thermostat. Stop now and call 1-800-468-1502 for advice.

Mark mounting position

Mount thermostat base

Connect wires

1. Match each labeled wire with same letter on the terminal block(s).

2. Use a screwdriver to loosen screw terminals, insert bare wire into slots, then tighten screws.

3. Push any excess wire back into the wall opening.

• 2-wire heat-only system: Connect one wire to R terminal, one wire to W terminal.
• 3-wire hot water heat-only system: Connect wires R to R, W to W, and Y to Y terminals.

Set cycle rate switches

Move the cycle rate switches to the proper setting for your system (see table below).

Finish installation

1. Align the slots on the base with tabs on the thermostat, then push gently until the thermostat snaps into place.
2. Restore electrical power at the heating/ cooling system, or at the fuse/circuitbreaker panel.

Operation

CAUTION: EQUIPMENT DAMAGE HAZARD (CT87N) Do not operate cooling system when outdoor temperature is below 50°F (10°C).

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