Honeywell CT87A Round Thermostat Instruction Manual

Instruction Manual for Honeywell models including: CT87B, CT87J, CT87A Round Thermostat, CT87A, Round Thermostat, Thermostat

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CT87A,B,J Round® Thermostat
LOW VOLTAGE (15 TO 30 VAC), THERMOSTAT AND MOUNTING HARDWARE

1 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.

Installation Instructions

Compatible with:

Heating/Cooling system

CT87A CT87B CT87J

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

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

Yes No

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

Yes

Electric heat furnace with or without cooling:

Yes

Electric baseboard: Electric heating strips located just No above the floor, usually 120-240 volts

Multistage: A conventional system with more than one No stage, or an outdoor heating/cooling unit (compressor) with auxiliary or backup heat.

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

® U.S. Registered Trademark Copyright © 2002 Honeywell All Rights Reserved
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69-0274-6

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
· Flat blade screwdriver
· Spirit level

Optional Tools
· 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. In the box below, record the number that the adjustment lever

points to. This is the current (amp)

MERCURY SWITCH

rating of your heating system.

OLD THERMOSTAT ANTICIPATOR SCALE

Current setting: If you cannot find the heat

LEVER

anticipator setting on the old thermostat, you can use a

TYPICAL LOCATION OF A

standard setting for your type of

MERCURY SWITCH IN A THERMOSTAT

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). M19086

MERCURY NOTICE

Fig. 3. Wrapping wires.
WIRES THROUGH 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

M20133

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.

4 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).
COVER RING

WALLPLATE

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

THERMOSTAT WIRING OPENING
M20188

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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).

1/2 IN. BINDING HEAD SCREW (2)

OUTLET BOX

1
2 COVER RING SUBBASE 1/4 IN. ROUND HEAD SCREW (2)
A

THERMOSTAT WIRING HOLE
1 THE TWO INNER HOLES ARE USED WITH WALLPLATE.
2 IF OUTLET BOX IS HORIZONTAL, MOUNT COVER RING IN POSITION SHOWN, BUT FASTEN WITH SCREWS THROUGH "A". M20187

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CT87A,B,J ROUND® THERMOSTAT

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 1/4in. 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.

SPIRIT LEVEL

LEVELING POSTS (2)

OPENING FOR THERMOSTAT WIRING

MOUNTING SLOTS
M3319A

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

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CT87A,B,J ROUND® THERMOSTAT

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.

Wiring Cross-reference

Wire Label R, RH, 4, V Rc, R W, W1, H Y, Y1, M G, F B O See Fig. 13

Connect to CT87A
R
W Y
See Fig. 9

Connect to Connect to

CT87B

CT87J

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

2. Strip the wire insulation as needed to fit the wires underneath the terminal screws (Fig. 7).

Fig. 7. Fitting wires under the terminal screws.

FOR STRAIGHT CONNECTION-- STRIP 5/16 in. [8 mm]

FOR WRAPAROUND CONNECTION-- STRIP 7/16 in. [11 mm]

BARRIER

M1279

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.

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CT87A,B,J ROUND® THERMOSTAT
Fig. 8. CT87A for a 2-wire heating only system.
CT87A WALLPLATE

R
Y W

POWER HEAT

TO SYSTEM
M20183

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

R
Y W

CT87A WALLPLATE

WIRE LABELS (LETTERS ON ORIGINAL THERMOSTAT TERMINALS)
R

3-WIRE

HOT WATER

ZONE VALVE

B M20184

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

COOL · OFF ·

HEAT

FAN ON

RH G RC
Y W

AUTO ·

CT87B SUBBASE

POWER FAN COOL

TO SYSTEM

HEAT

JUMPER RH TO RC

M20185

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

COOL · OFF ·

HEAT

FAN ON

RH G RC
Y W

AUTO ·

CT87B SUBBASE

HEATING POWER
FAN

TO SYSTEM

COOLING POWER

TO SYSTEM

COOL

HEAT

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

M20225

COOL · OFF ·

HEAT

FAN ON

JUMPER W TO Y

AUTO ·

CT87J SUBBASE

HEAT FAN

TO SYSTEM

POWER

COOL REVERSING VALVE

HEAT REVERSING VALVE
DO NOT ATTACH WIRES TO BOTH B AND O M20186

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

CT87J SUBBASE

HEAT

FAN ON

FAN

COOL · OFF ·

AUTO ·

POWER

P R

HEAT REVERSING
VALVE
COOL REVERSING
VALVE

TO SYSTEM

HEAT PUMP COMPRESSOR

DO NOT ATTACH WIRES TO BOTH B AND O

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

THERMOSTAT, CONTACT YOUR LOCAL CONTRACTOR FOR

FURTHER ASSISTANCE.

M20228

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CT87A,B,J ROUND® THERMOSTAT

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.

Fig. 14. Adjusting heat anticipator indicator.

HEAT ANTICIPATOR INDICATOR

1.2

.6 .5 .4 .3 .2

HOLE SUITABLE FOR PENCIL POINT TO MOVE INDICATOR

.15
SCALE

.12 .10

M20226

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.
Fig. 15. Tightening mounting screws.

CAPTIVE SCREWS (3)

M20227

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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.

Your heating system: Steam Hot water heat High-efficiency warm air Standard warm air Electric heat

Heat anticipator setting: 1.2 0.8 0.8 0.4 0.3

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.

9 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.
Fig. 16. Checking heating system.
SETTING SCALE

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THERMOMETER

M9656

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CT87A,B,J ROUND® THERMOSTAT

Check cooling
IMPORTANT: To avoid damaging the compressor in the air conditioner, do not operate the cooling system when the outdoor temperature is below 50°F (10°C).
1. If your CT87 has a subbase, set the System switch on the left to Cool.

IMPORTANT: After heating is tested, wait five minutes before switching to Cool on the CT87J model.
2. Lower the temperature setting below room temperature. The cooling system should start.
3. Raise the temperature setting above room temperature. The cooling system should stop.
Operation

To set the temperature, turn the dial until the pointer on the top setting scale aligns with the desired temperature.

CT87B, J switches

Switch System
Fan

Setting

Result

Cool Off Heat On Auto

The thermostat controls your cooling system. Both the heating and cooling systems are off. The thermostat controls your heating system. The fan runs continuously. The fan runs only with the heating or cooling system.

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CT87A,B,J ROUND® THERMOSTAT

Limited One-Year Warranty

Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywell's option) within a reasonable period of time.

If the product is defective,

(i) return it, with a bill of sale or other dated proof of purchase, to the retailer where you purchased it, or

(ii) package it carefully, along with proof of purchase (including date of purchase) and a short description of the malfunction, and mail it, postage prepaid, to the following address:

Honeywell Inc. USA Dock 4 -- MN10-3860 1985 Douglas Drive North Golden Valley, MN 55422-3992

Honeywell Canada: Honeywell Limited/Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9

This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.

Honeywell's sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.

THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

This warranty gives you specific legal rights, and you may have other rights which vary from state to state.

If you have any questions concerning this warranty, please write Honeywell Customer Care, Honeywell Inc., 1985 Douglas Dr. N., Golden Valley, MN 55422-3992, or call 1-800-468-1502. In Canada, write Retail Products ON15, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.

Automation and Control Solutions

Honeywell

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN 55422

Scarborough, Ontario

M1V 4Z9

69-0274-6 G.H. Rev. 08-02

Printed in U.S.A. on recycled
paper containing at least 10% www.honeywell.com/yourhome
post-consumer paper fibers.

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References

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