Honeywell Round CT87A User manual

® U.S. Registered Trademark

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.

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

Heating/Cooling system

Compatible with:

CT87A CT87B CT87J

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

water heat

Yes Yes No

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

No Yes No

Single stage heat pump: Outdoor heating/cooling unit

(compressor) with no auxiliary or backup heat.

No No Yes

Electric heat furnace with or without cooling: No No Yes

Electric baseboard: Electric heating strips located just

above the floor, usually 120-240 volts

No No No

Multistage: A conventional system with more than one

stage, or an outdoor heating/cooling unit (compressor)

with auxiliary or backup heat.

No No No

CT87A,B,J Round®Thermostat

LOW VOLTAGE (15 TO 30 VAC),

THERMOSTAT AND MOUNTING HARDWARE

Installation Instructions

CT87A,B,J ROUND® THERMOSTAT

69-0274-6 2

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:

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).

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

this installation.

4. Unscrew and remove the old thermostat wallplate from the wall, but

do not disconnect the wires.

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

M20206

MERCURY

SWITCH

OLD THERMOSTAT

ANTICIPATOR

SCALE

LEVER

TYPICAL LOCATION OF A

MERCURY SWITCH IN

A THERMOSTAT

Fig. 1. Mercury switch location.

CT87A,B,J ROUND® THERMOSTAT

3 69-0274-6

5. Label the wires using the wiring

labels that came with the CT87.

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).

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.

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

M19086

Fig. 2. Labeling wires.

Fig. 3. Wrapping wires.

WIRES THROUG

WALL OPENING

M20133

MERCURY NOTICE

M20188

WALLPLATE

THERMOSTAT

WIRING OPENING

COVER RING

NO. 4 X 1 INCH

SHEET METAL SCREWS (2)

CT87A,B,J ROUND® THERMOSTAT

69-0274-6 4

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).

M2018

OUTLET BOX

SUBBASE

COVER RING

THERMOSTAT

WIRING HOLE

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".

1/2 IN. BINDING

HEAD SCREW (2)

/4 IN.

OUND

EAD

CREW (2)

CT87A,B,J ROUND® THERMOSTAT

5 69-0274-6

1. Place the cover ring against the outlet box so that the arrow in the

middle of the cover ring is pointing up.

2. Pull the wires through the wiring hole on the bottom left side of the

cover ring.

3. Align the screw slots on the cover ring with the outlet box screw

holes, and attach the cover ring to the outlet box with two 1/2-in.

screws.

4. Place the wallplate or subbase over the cover ring so that the wiring

holes line up, and pull the wires through.

5. Loosely attach the wallplate/subbase to the cover ring with two 1/4-

in. screws, through the screw holes on the left and right sides of the

wallplate/subbase.

Level the wallplate or subbase

IMPORTANT: The wallplate/subbase must be level to maintain accu-

rate thermostat temperature.

1. Rotate the wallplate/subbase until level as shown in Fig. 6.

To level the subbase, use the leveling posts directly below the Heat

and Fan indicators.

Fig. 6. Leveling the wallplate.

2. Tighten the mounting screws after making sure that the wallplate or

subbase is level.

SPIRIT

LEVEL LEVELIN

POSTS (2

)

MOUNTING

SLOTS

M3319A

PENING FOR

HERMOSTAT

IRING

CT87A,B,J ROUND® THERMOSTAT

69-0274-6 6

Wire the thermostat

1. Use the wiring cross-reference table below to match each old

thermostat wire with its corresponding terminal on the CT87 wallplate

or subbase. See Fig. 8 through 13 wiring diagrams.

*Never attach wires to both the B and O terminals.

2. Strip the wire insulation as needed to fit the wires underneath the ter-

minal screws (Fig. 7).

3. Loosen the terminal screws and slip each wire beneath its matching

terminal.

4. Securely tighten the terminal screws.

5. Push any excess wire back into the wall.

Wiring Cross-reference

Wire Label

Connect to

CT87A

Connect to

CT87B

Connect to

CT87J

R, RH, 4, V R RH R

Rc, R Rc

W, W1, H W W W

Y, Y 1, M Y Y Y

G, F GG

B See Fig. 9 B*

OO*

See Fig. 13 P

Fig. 7. Fitting wires under the terminal screws.

M1279

OR STRAIGHT

ONNECTION—

TRIP 5/16 in. [8 mm]

FOR WRAPAROUND

CONNECTION—

STRIP 7/16 in. [11 mm

]

BARRIER

CT87A,B,J ROUND® THERMOSTAT

7 69-0274-6

Fig. 8. CT87A for a 2-wire heating only system.

Fig. 9. CT87A for a 3-wire hot water heating only system.

Fig. 10. CT87B for a 4-wire heating/cooling system.

M2018

CT87A WALLPLATE

SYSTEM

POWER

HEAT

M2018

WIRE LABELS

(LETTERS

ON ORIGINAL

THERMOSTAT

TERMINALS)

CT87A WALLPLATE

3-WIRE

HOT WATER

ZONE VALVE

•

M2018

POWER

CT87B SUBBASE

SYSTE

RHG

FAN

HEAT

COOL

JUMPER RHTO RC

CT87A,B,J ROUND® THERMOSTAT

69-0274-6 8

Fig. 11. CT87B for a 5-wire heating/cooling system.

Fig. 12. CT87J for a 4-wire single stage heat pump.

Fig. 13. CT87J for 4-wire single stage heat pump.

•

M2022

HEATING

POWER

CT87B SUBBASE

SYSTE

SYSTEM

RHG

FAN

HEAT

COOLING

POWER

COOL

•

M2018

HEAT

CT87J SUBBASE

SYSTE

YPBRO

FAN

POWER

DO NOT ATTACH WIRES

TO BOTH B AND O

JUMPER W TO Y

COOL

REVERSING VALVE

HEAT

REVERSING VALVE

•

M2022

CT87J SUBBASE

SYSTE

POWER

FAN

DO NOT ATTACH WIRES

TO BOTH B AND O

HEAT PUMP

COMPRESSOR

COOL

REVERSING

VALVE

HEAT

REVERSING

VALVE

IF WIRES ARE ATTACHED TO Y OR W, AND P ON YOUR OLD

THERMOSTAT, CONTACT YOUR LOCAL CONTRACTOR FOR

FURTHER ASSISTANCE.

CT87A,B,J ROUND® THERMOSTAT

9 69-0274-6

Mount the thermostat

1. Pull off the thermostat cover and discard the red plastic insert that

holds the mercury switch in place during shipping.

2. Using a pencil point, slide the heat anticipator indicator to 1.2 on the

scale as shown in Fig. 14.

IMPORTANT: This prevents the thermostat from being damaged.

3. Place the thermostat over the wallplate or subbase so that the three

captive mounting screws align with the three raised screw holes on

the wallplate/subbase.

4. Tighten the three captive mounting screws as shown in Fig. 15.

NOTE: These screws complete the installation of the

thermostat.

.15 .12 .10

1.2

HOLE SUITABLE FOR

PENCIL POINT

TO MOVE INDICATOR

HEAT ANTICIPATOR INDICATOR

SCALE

M20226

Fig. 14. Adjusting heat anticipator indicator.

CAPTIVE SCREWS (3) M2022

Fig. 15. Tightening mounting screws.

CT87A,B,J ROUND® THERMOSTAT

69-0274-6 10

Set the heat anticipator for your system

IMPORTANT: Setting the heat anticipator allows the thermostat to

maintain accurate temperature control.

1. Using a pencil point, move the heat anticipator pointer to the number

that you recorded in Step 3, sub-step 3. If you could not find the

anticipator setting on the old thermostat, use the setting for your type

of system shown in the table below.

2. Snap on the thermostat cover.

NOTE: If the furnace stays on beyond the thermostat set temperature,

move the anticipator pointer down by .1 ampere.

If the furnace shuts off before the set temperature is reached, move the

anticipator pointer up by .1 ampere.

Never adjust the anticipator below .3 ampere.

Check heating/cooling operation

Check heating

1. Turn the transparent dial to the farthest point left.

2. If your CT87 has a subbase, set the system switch to Heat.

3. Turn the dial until the temperature on the setting scale (Fig. 16)

exceeds the room temperature that is shown on the thermometer.

The heating system should start.

4. Turn the dial until the temperature on the setting scale is below the

room temperature that is shown on the thermometer.

The heating system should stop.

Your heating system: Heat anticipator setting:

Steam 1.2

Hot water heat 0.8

High-efficiency warm air 0.8

Standard warm air 0.4

Electric heat 0.3

HERMOMETER

SETTING SCALE

M9656

Fig. 16. Checking heating system.

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