Honeywell CT87B Installation And Owner's Manual
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CT86A, CT86C, CT87B
Designer Round Thermostats
Installation and Owner's Manual
• CT86A is for 15 to 30 Vac Control of heating-only or
cooling-only systems.
• CT87B is for 15 to 30 Vac control heating/cooling
systems.
• CT86C is for 250, 500 or 750 mV Powerpile heating
systems only.
4
Mount Cover Ring and Wallplate or Subbase
■ ■
Place cover ring on the wall or outlet box at the desired location with
the cable entrance holes to the left. (Use of cover ring is optional for wall
mounting.)
■ ■
Bring thermostat cable through the bottom entrance hole of the cover
ring and through the wallplate or subbase entrance hole.
■ ■
Fasten the cover ring and wallplate or subbase to the wall or outlet box
with the mounting screws as shown in applicable illustration.
MOLDED
THERMOSTAT
LEVELING
WIRE
POSTS
ENTERANCE
HOLE
1. USE WALLPLATE FOR HEATING ONLY
CT86
1. USE WALL PLATE FOR HEATING
APPLICATIONS ( CT86)
ONLY APPLICATIONS (CT86)
2. USE SWITCHING SUBBASE FOR
NO 4 x 1 INCH
2. USE SWITCHING SUBBASE FOR
SHEET METAL
HEAT/COOL APPLICATIONS (CT87)
HEAT/COOL APPLICATIONS (CT87)
SCREWS (3)
WALLPLATE 1
THERMOSTAT
CAPTIVE
WIRE
MOUNTING
ENTERANCE
SCREWS (3)
HOLE
CT87
NO 4 x 1 INCH
SHEET METAL
SCREWS (3)
SWITCHING 2
CAPTIVE
SUBBASE
MOUNTING
SCREWS (3)
M6114
6
Mount the Thermostat
■ ■
Align the thermostat over the wallplate or subbase and tighten the
three captive mounting screws (shown in illustration under step 4). These
captive mounting screws complete the electrical connections to the
thermostat.
7
Set Heat Anticipator Lever
(applicable to CT86A or CT87B only)
■ ■
Make sure you have the current draw (anticipator setting) for your
system. This is the number you wrote in the box in step 3. If you were
unable to find the current draw for step 3, this information can be found
printed on the primary control at the furnace or boiler. The primary control
is usually a gas valve, a relay or burner control box, Aquastat
controller, or zone valve with the thermostat wires connected to it.
These controls are usually located behind the furnace cover. See illustration
at right.
CONSUMER PRODUCTS: Honeywell warrants to the consumer that all Honeywell Consumer Products will be
free from defects in workmanship or materials, under normal use and service, for a period one (1) year from date
or original purchase by a consumer. If, at any time during the warranty period, a product is defective or
malfunctions, it should be carefully packaged, along with proof of purchase (including date purchased) and a short
description of the malfunction, and
1) returned to the store from which it was purchased, or
2) mailed, postage prepaid, to the following address:
Honeywell Limited, Product Services ON15-FFe 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9
LIMITED ONE YEAR WARRANTY: This warranty shall not apply if it 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 CONSEQUENTIAL DAMAGES RESULTING FROM ANY
BREACH OF ANY WARRANTY, EXPRESSED OR IMPLIED, APPLICABLE TO THIS PRODUCT. Some
provinces and territories do not allow the exclusion or limitation of consequential damages, so this limitation may
not
to you.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, AND THE
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY
EXCLUDED BEYOND THE ONE YEAR DURATION OF THE WARRANTY. Some provinces and territories do not
allow limitation on the duration of an implied warranty, so the above limitation may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary according to
province or territory. This warranty is in addition to and not a modification of or subtraction from warranties and other
rights and remedies contained in Statutes relating to the sale of this product.
Batteries included with Battery Operated Products are excluded from the Warranty as they are not manufactured by
Honeywell Limited. Such batteries are covered by battery manufacturer's Warranty, if any.
Honeywell Limited Scarborough, Ontario M1V 4Z9
Form 69-0721B–1
Printed in U.S.A.
© Honeywell International, Inc. 2003
1
Preparation
Proper installation of your Honeywell thermostat is easy if you follow
these instructions, STEP-BY-STEP. It is recommended that as you read,
understand and complete each step, you check it off.
■ ■
Assemble tools required:
Flat blade screwdriver
Wire cutter/stripper or sharp knife
Hand or power drill with 3/16 inch drill bit
Spirit level or plumb bob and line
■ ■
Make certain that your burner and/or cooling system are working, especially
if they have been inoperative for any length of time. If either one does not work,
contact your local heating/air conditioning dealer. On cooling systems, do not
operate cooling if outdoor temperature is below 50° F [10° C].
■ ■
Turn off power to the system at the main fuse panel. Most buildings have a
separate switch box or circuit breaker for disconnecting power to the furnace.
MERCURY NOTICE
If this control is replacing a control that contains mercury in a sealed tube,
do not place your old control in the trash. Dispose of properly.
Contact your local waste management authority for instructions regard-
ing recycling and the proper disposal of an old control.
SPIRIT
LEVEL
OPENING FOR
THERMOSTAT
WIRING
■ ■
Tighten the screws after using spirit level or plumb line to accurately level the
wallplate or subbase. It must be level to maintain accurate calibration.
TYPICAL WIRING DIAGRAMS
Q539A, CT87A, B INTERNAL SCHEMATIC
G
B
ADJUST-
ABLE
O
HEAT
ANTICIPATOR
Y
R
W
OFF
FAN
HEAT
COOL
RELAY
COIL
2
B
O
COOLING
DAMPER
HEATING
MOTOR
RELAY OR
VALVE COIL
HEATING
DAMPER
MOTOR
(IF USED)
COOLING
CONTACTOR
COIL
HEATING
DAMPER
MOTOR
(IF USED)
COOLING
DAMPER
1
MOTOR
C
apply
R
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M3320
2
NO. 4 TERMINAL IS SAME AS B TERMINAL.
2
Unpack Your Thermostat
Handle your new thermostat carefully; rough handling can interfere with
its accuracy.
■ ■
Remove and discard shipping wrap. Save screws and instructions.
■ ■
Remove thermostat cover; set aside until called for later.
Remove material protecting mercury switch bulb.
3
Remove Old Thermostat
■ ■
Remove cover of old thermostat. If it re-
sists, check for a screw that locks on the cover.
■ ■
If installing a CT86A or CT87B, before re-
moving the old thermostat from the wall, look at
it carefully to locate the heat anticipator adjust-
ment mechanism.
(See illustration to help you recognize the heat anticipa-
tor.) Make a note here ______________ of
pator setting for future reference.
The heat anticipator pointer, if adjustable, will be set at one of a series of
numbers representing the current rating of the primary control in your furnace.
5
Wire Wallplate (CT86A) or Subbase (CT87B)
■ ■
Follow
the
instructions
heating/cooling equipment manufacturer. If not available, refer to Typical
Wiring Diagrams at the end of this publication.
LEVELING
NOTE: All wiring must comply with local electrical codes
POSTS (2)
and ordinances.
FOR WALLPLATE (CT86A heating system only)
■ ■
Refer to illustration below and strip thermostat wire insulation as necessary.
NOTE: Clean wire ends thoroughly before connecting.
■ ■
Connect either wire to R terminal and the other wire to W terminal. Firmly
tighten screws.
FOR STRAIGHT
CONNECTION–
MOUNTING
STRIP 5/16 in. [8 mm]
SLOTS
M3319A
Typical hookup and internal schematic for CT86A heat and CT87B heat-cool
applications using common power supply
POWERPILE
CT86C POWERPILE
PILOT GENERATOR
THERMOSTAT
CT87A,B
TEMP.
R
FALL
POWERPILE
1
FIXED
COOL
GAS VALVE
ANTICIPATOR
HIGH
PP
TH
LIMIT
PP
TH
CONTROL
1
W
Y
1
1
FAN
1
CIRCLED WIRING MUST BE APPROVED SAFETY-CIRCUIT
AUTO
ON
OFF
WIRING
HEAT
COOL
2
USE R AND W TERMINALS FOR 750 mV SYSTEM. USE R
AND Y TERMINALS FOR A 250 OR 500 mV SYSTEM.
Y
W
G
R
HEATING
RELAY OR
VALVE COIL
FAN
RELAY
COIL
SHOWS
VOLTAGE
RATING
COOLING
24 Vac 50/60 Hz
CONTACTOR
COIL
0.4 AMP
FROM MAIN
FUEL SUPPLY
TYPICAL GAS VALVE
■ ■
Move the heat anticipator lever to match the
1
number from step 3 or printed on primary con-
trol, as shown right. If no current draw informa-
tion can be found, leave the anticipator setting
at 4, the factory setting.
■ ■
Attach thermostat cover.
The number will be one of the following: .2, .4, .8 etc., or 0.2, 0.4, 0.8, etc.
If no heat anticipator/indication is showing, do not be concerned; move on to the
next step.
■ ■
Loosen screws holding thermostat base to subbase or wall and lift away.
■ ■
Disconnect wires from old thermostat or subbase or wallplate. Wrap the wires
around a pencil or other object, as shown, to prevent them from falling back into
the wall opening.
For heating/cooling system: As you disconnect each
wire, tape the end and label with the letter of the terminal
BULB
designation to make reconnection to new subbase or
SWITCH
wallplate easier.
For heating only system: Normally there are only two
ANTICIPATOR
wires connected to the old wallplate. They can be con-
SCALE
nected to the new wallplate W and R terminals. No wire
labelling is necessary.
ANTICIPATOR
■ ■
Keep the old thermostat for reference purposes until your new thermostat is
M6115
SETTING LEVER
that antici-
functioning smoothly.
NOTE: Your thermostat should be located about 5 ft. [1.5 m] above the floor in an area
with good air circulation and average temperature. It should not be on an outside
wall.
■ ■
Push excess wire back into wall.
■ ■
provided
by
the
heating
or
Plug hole in wall with nonflammable insulation to prevent drafts from affecting
thermostat operation.
FOR SUBBASE (CT87B heating/cooling systems)
■ ■
Refer to illustration above and strip thermostat wire insulation as necessary.
■ ■
Connect the wires to matching terminals on the subbase. If your old thermostat
had an R terminal, and your new one has R and RH or RH and RC terminals,
connect the old wire R to terminal RH, and add a jumper to connect RC or R to RH.
The drawing below shows how to jumper RC or R to RH. Strip the insulation off the
wire where it connects to the terminals. Firmly tighten screws.
■ ■
Push excess wire back into wall.
■ ■
Plug hole with nonflammable insulation to prevent drafts from affecting the
thermostat operation.
FOR WRAPAROUND
CONNECTION–
STRIP 7/16 in. [11 mm]
M3327
R
R
8
Setting Temperature
.
■ ■
Turn the transparent dial until the desired point on the setting scale
is in line with the pointer, as shown
Typical Powerpile millivolt
system hookup for CT86C
2
SETTING SUBBASE SWITCH (heating/cooling models only)
R
Y
W
SHOWS
VOLTAGE
RATING
V8043E 1004 4
24V 50/60CY
SHOWS
.32 AMP @ 60CY
ANTICIPATOR
SETTING
THERMOMETER
ZONE VALVE
M2685
M3321
OIL BURNER CONTROL
OIL BURNER CONTROL
SHOWS
SHOWS
SHOWS
CURRENT
SHOWS
CURRENT
VOLTAGE
9
DRAW
VOLTAGE
DRAW
System Checkout
RATING
RATING
CT
86A, CT87B
Turn down temperature setting to lowest point. If subbase is used, move
T
T
system switch to HEAT position. Raise temperature setting until burner
F
T
TO
F
T
BURNER
starts. Slowly turn dial back. Burner should stop when dial has been
F
S
turned below room temperature. If thermostat controls cooling,
PATOR
F
NG
M6116B
move subbase system switch (if used) to COOL and lower setting until cooling
SHOWS
ANTICIPATOR
equipment starts. Raise setting above room temperature and cooling system
SETTING
M6116B
should shut down. Make certain equipment functions properly in response to the
thermostat.
CT86C
SCALE
.15
.12
Make certain the pilot burner is lit before checking thermostat operation. Then
LONGER
raise thermostat temperature setting slowly until the burner starts. Note this
HOLE SUITABLE FOR
PENCIL POINT
setting. Slowly turn dial back. The burner should stop when the dial has been
HEAT
TO MOVE INDICATOR
ANTICIPATOR
turned back 1 or 2 degrees below room temperature.
INDICATOR
WIRES THROUGH
WALL OPENING
WIR
WAL
R
H
G
EXAMPLE: FOR R AND R
OR R
AND R
H
H
C
JUMPER, STRIP WIRE END LONG ENOUGH
EX
TO JOIN BOTH TERMINALS.
EN
DÈ
PU
OR
Y
C
W
.
■ ■
To operate the heating
SETTING SCALE
system, set subbase sys-
tem switch at HEAT; to op-
erate cooling, set switch at
COOL. Set at OFF if you
want neither heating nor
cooling.
■ ■
Set fan switch to ON
for continuous fan opera-
tion, or to AUTO for fan
operation during heating or
cooling cycles.
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Summary of Contents for Honeywell CT87B
- Page 1 Honeywell Limited, Product Services ON15-FFe 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9 VOLTAGE DAMPER RATING LIMITED ONE YEAR WARRANTY: This warranty shall not apply if it shown by Honeywell that the defect or MOTOR BURNER starts. Slowly turn dial back. Burner should stop when dial has been...
- Page 2 Le brûleur devrait cesser de TROU PERMETTANT ne sont pas fabriquées par Honeywell Limitée. Les dites piles sont couvertes par la garantie du fabricant, si tel est le INDICATEUR DE organes de commande sont situés derrière le couvercle de l’appareil de l’usine, soit 0,4.