Honeywell CT87A User Manual 2

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CT87A,B,J Round® Thermostat

LOW VOLTAGE (15 TO 30 VAC),

THERMOSTAT AND MOUNTING HARDWARE

Installation Instructions

Verify that you have the correct thermostat

Using the compatibility chart below, verify that you purchased the correct CT87Thermostat for your heating/cooling system. If you are unsure which model is right for your system, visit

www.honeywell.com/ yourhome or call Honeywell

Customer Care at 1-800-468-1502.

Compatible with:

Heating/Cooling system

Heating only: Gas or oil fueled warm air, steam, or hot

water heat

Cooling only: Electric air conditioning Yes* Yes Yes

Heating and cooling: Gas or oil fueled warm air,

steam, or hot water heat with electric air conditioning

Single stage heat pump: Outdoor heating/cooling unit (compressor) with no auxiliary or backup heat.

Electric heat furnace with or without cooling: No No

Electric baseboard: Electric heating strips located just

above the floor, usually 120-240 volts

Multistage: A conventional system with more than one stage, or an outdoor heating/cooling unit (compressor) with auxiliary or backup heat.

CT87A CT87B CT87J

Yes Yes No

No No Yes

No No No

Yes No

Yes

* CT87A is compatible with 2-wire cooling-only systems.

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CT87A,B,J ROUND® THERMOSTAT

Prepare for installation

1. Carefully unpack your new thermostat; rough handling may affect its accuracy. Save your receipt and identify the following parts:

• CT87 Thermostat

• Screws: two 1-in. sheet metal screws, two 1/2-in. binding head

screws, and two 1/4-in. round head screws

• Wallplate (CT87A) or subbase (CT87B, CT87J)

• Cover ring (select models only). Necessary if installing on an

outlet box. Optional if installing directly on the wall; can be used to hide wall marks.

• These Installation Instructions and the Installation Quick Guide.

• Wiring labels

2. Gather these tools:

Required Tools Optional Tools

• Flat blade

screwdriver

• Spirit level

• Hand or power drill with 1/16-in. drill bit

• Wire cutter/stripper or sharp knife

• Pencil

Remove the old thermostat

1. Turn off power to the heating/cooling system at the main fuse/circuit breaker panel.

2. Remove the cover of your old thermostat. You may need to unscrew the cover if it is locked on.

3. Locate the heat anticipator adjustment scale and lever on the old thermostat (Fig. 1).

Fig. 1. Mercury switch location.

MERCURY SWITCH

OLD THERMOSTAT ANTICIPATOR SCALE

LEVER

TYPICAL LOCATION OF A MERCURY SWITCH IN A THERMOSTAT

In the box below, record the number that the adjustment lever points to. This is the current (amp) rating of your heating system.

Current setting:

If you cannot find the heat anticipator setting on the old thermostat, you can use a standard setting for your type of system when you reach Step 8 of

M20206

this installation.

4. Unscrew and remove the old thermostat wallplate from the wall, but do not disconnect the wires.

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CT87A,B,J ROUND® THERMOSTAT

5. Label the wires using the wiring

labels that came with the CT87.

Fig. 2. Labeling wires.

Identify each wire using the letter of the terminal on the old thermo- stat (Fig. 2). Do not label the wires by color.

6. Disconnect the wires from the old thermostat and wrap them around a pencil to keep them from

falling

back into the wall (Fig. 3).

Fig. 3. Wrapping wires.

WIRES THROUG

MERCURY NOTICE

WALL OPENING

If this thermostat 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 this control, or of an old control containing mercury in a sealed tube.

Install the cover ring and wallplate or subbase

If installing on the wall

Refer to Fig. 4 as you work.

M19086

M20133

Fig. 4. Installing wallplate/subbase on the wall (wallplate shown).

COVER RING

WALLPLATE

THERMOSTAT

NO. 4 X 1 INCH SHEET METAL SCREWS (2)

3 69-0274-6

WIRING OPENING

M20188

CT87A,B,J ROUND® THERMOSTAT

1 R H S

1. If using the cover ring: Position the cover ring against the wall so that the arrow in the middle of the cover ring is pointing up.

2. Position the wallplate or subbase.

• If using cover ring: Place the wallplate/subbase over the cover

ring. Rotate the wallplate/subbase until the wiring openings are aligned and the two screw holes on the left and right side of the wallplate/subbase align with the screw holes on the cover ring. You will be inserting screws through these holes into the wall.

• If attaching wallplate directly to the wall: Position so that the

UP indicator on the wallplate is on top.

• If attaching subbase directly to the wall: Position so that the

fan and heating/cooling switches are on the top.

3. Use a pencil to mark the center of the screw holes on the left and right sides of the wallplate or subbase.

4. Remove the wallplate/subbase and cover ring, and drill two 1/16-in. holes at the locations you marked.

5. Reposition the cover ring (if used) and wallplate/subbase over the holes, pull the wires through the wiring opening, and loosely insert the two 1-in. screws into the drilled holes.

If installing on an outlet box

Refer to Fig. 5 as you work.

Fig. 5. Installing wallplate/subbase on an outlet box (subbase shown).

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1/2 IN. BINDING HEAD SCREW (2)

COVER RING

SUBBASE

/4 IN.

OUND EAD

CREW (2)

THE TWO INNER HOLES ARE USED WITH WALLPLATE.

IF OUTLET BOX IS HORIZONTAL, MOUNT COVER RING IN POSITION SHOWN, BUT FASTEN WITH SCREWS THROUGH "A".

OUTLET BOX

THERMOSTAT WIRING HOLE

M2018

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