Honeywell CT87A Thermostat User Manual

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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  
1
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  
CT87A CT87B CT87J  
Heating only: Gas or oil fueled warm air, steam, or hot Yes  
Yes  
No  
water heat  
Cooling only: Electric air conditioning  
Yes*  
No  
Yes  
Yes  
Yes  
No  
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 No  
No  
Yes  
(
compressor) with no auxiliary or backup heat.  
Electric heat furnace with or without cooling:  
No  
No  
No  
Yes  
No  
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.  
No  
No  
*
CT87A is compatible with 2-wire cooling-only systems.  
®
U.S. Registered Trademark  
Copyright © 2002 Honeywell  
All Rights Reserved  
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CT87A,B,J ROUND® THERMOSTAT  
Prepare for installation  
2
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  
3
1
2
3
. Turn off power to the heating/cooling system at the main fuse/circuit  
breaker panel.  
. Remove the cover of your old thermostat. You may need to unscrew  
the cover if it is locked on.  
. Locate the heat anticipator adjustment scale and lever on the old  
thermostat (Fig. 1).  
In the box below, record the  
Fig. 1. Mercury switch location.  
number that the adjustment lever  
points to. This is the current (amp)  
rating of your heating system.  
MERCURY  
SWITCH  
Current setting:  
OLD THERMOSTAT  
ANTICIPATOR  
SCALE  
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.  
LEVER  
TYPICAL LOCATION OF A  
MERCURY SWITCH IN  
A THERMOSTAT  
M20206  
4
. Unscrew and remove the old thermostat wallplate from the wall, but  
do not disconnect the wires.  
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5
. Label the wires using the wiring  
Fig. 2. Labeling wires.  
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).  
M19086  
Fig. 3. Wrapping wires.  
WIRES THROUGH  
WALL OPENING  
MERCURY NOTICE  
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  
M20133  
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  
4
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  
THERMOSTAT  
WIRING OPENING  
NO. 4 X 1 INCH  
SHEET METAL SCREWS (2)  
M20188  
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1
2
. 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.  
. 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
4
5
. Use a pencil to mark the center of the screw holes on the left and  
right sides of the wallplate or subbase.  
. Remove the wallplate/subbase and cover ring, and drill two 1/16-in.  
holes at the locations you marked.  
. 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).  
OUTLET BOX  
1/2 IN. BINDING  
HEAD SCREW (2)  
1
2
COVER RING  
SUBBASE  
1/4 IN.  
ROUND  
HEAD  
SCREW (2)  
A
THERMOSTAT  
WIRING HOLE  
1
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".  
M20187  
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1
2
3
. Place the cover ring against the outlet box so that the arrow in the  
middle of the cover ring is pointing up.  
. Pull the wires through the wiring hole on the bottom left side of the  
cover ring.  
. 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  
rate thermostat temperature.  
5
IMPORTANT: The wallplate/subbase must be level to maintain accu-  
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.  
5
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Wire the thermostat  
6
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  
Connect to Connect to Connect to  
Wire Label  
R, RH, 4, V  
Rc, R  
CT87A  
CT87B  
CT87J  
R
RH  
R
Rc  
W
W, W , H  
W
Y
W
Y
1
Y, Y , M  
Y
1
G, F  
G
G
B
O
See Fig. 9  
B*  
O*  
P
See Fig. 13  
*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).  
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.  
. 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  
POWER  
R
TO  
SYSTEM  
Y
W
HEAT  
M20183  
Fig. 9. CT87A for a 3-wire hot water heating only system.  
CT87A WALLPLATE  
WIRE LABELS  
LETTERS  
(
ON ORIGINAL  
THERMOSTAT  
TERMINALS)  
R
R
3-WIRE  
W
HOT WATER  
ZONE VALVE  
Y
W
B
M20184  
Fig. 10. CT87B for a 4-wire heating/cooling system.  
CT87B SUBBASE  
POWER  
FAN  
TO  
SYSTEM  
RH G  
COOL  
RC  
Y
W
HEAT  
JUMPER R  
H
TO R  
C
M20185  
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Fig. 11. CT87B for a 5-wire heating/cooling system.  
CT87B SUBBASE  
HEATING  
POWER  
TO  
SYSTEM  
FAN  
RH G  
COOLING  
POWER  
RC  
TO  
SYSTEM  
Y
W
COOL  
HEAT  
M20225  
Fig. 12. CT87J for a 4-wire single stage heat pump.  
CT87J SUBBASE  
HEAT  
FAN  
TO  
SYSTEM  
W G  
POWER  
Y
P
R
COOL  
REVERSING VALVE  
O
B
HEAT  
REVERSING VALVE  
DO NOT ATTACH WIRES  
JUMPER W TO Y  
TO BOTH B AND O  
M20186  
Fig. 13. CT87J for 4-wire single stage heat pump.  
CT87J SUBBASE  
FAN  
POWER  
W
G
HEAT  
REVERSING  
VALVE  
Y
1
P
COOL  
REVERSING  
VALVE  
R
TO  
SYSTEM  
B
O
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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Mount the thermostat  
7
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  
.15  
.12 .10  
TO MOVE INDICATOR  
SCALE  
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  
maintain accurate temperature control.  
8
IMPORTANT: Setting the heat anticipator allows the thermostat to  
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: Heat anticipator setting:  
Steam  
1.2  
0.8  
0.8  
0.4  
0.3  
Hot water heat  
High-efficiency warm air  
Standard warm air  
Electric heat  
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  
9
Check heating  
1
2
3
. Turn the transparent dial to the farthest point left.  
. If your CT87 has a subbase, set the system switch to Heat.  
. 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  
THERMOMETER  
M9656  
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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 switch-  
ing 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  
Setting  
Result  
System Cool  
The thermostat controls your cooling system.  
Both the heating and cooling systems are off.  
The thermostat controls your heating system.  
The fan runs continuously.  
Off  
Heat  
Fan  
On  
Auto  
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  
Honeywell Canada:  
Dock 4 — MN10-3860  
Honeywell Limited/Honeywell Limitée  
35 Dynamic Drive  
1
985 Douglas Drive North  
Golden Valley, MN 55422-3992  
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  
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
1
985 Douglas Drive North  
Golden Valley, MN 55422  
Printed in U.S.A. on recycled  
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paper containing at least 10% www.honeywell.com/yourhome  
post-consumer paper fibers.  

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