Honeywell CT8602 User manual

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OWNER’S GUIDE
® U.S. Registered Trademark
Copyright © 2004 Honeywell International Inc.
All Rights Reserved
Honeywell CT8602
PROGRAMMABLE THERMOSTAT
Seven Day
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Model CT8602
Para obtener un documento con las instrucciones en español, por favor visite
nuestro sitio de web a: www.honeywell.com/yourhome.
Pour obtenir des notices techniques en français, veuillez consulter notre site
web: www.honeywell.com/yourhome.
Table of Contents
Step 1. Prepare for Installation ............................................................................................................................................... 5
Step 2. Remove Old Thermostat ............................................................................................................................................ 5
Step 3. Mount Thermostat Wallplate ...................................................................................................................................... 6
Step 4. Wire Wallplate Terminals ........................................................................................................................................... 7
Step 5. Install the Batteries .................................................................................................................................................... 8
Step 6. Set Fan Operation Switch .......................................................................................................................................... 9
Step 7. Mount the Thermostat ............................................................................................................................................... 10
Step 8. Customize Your Thermostat ...................................................................................................................................... 10
Step 9. Set the Clock ............................................................................................................................................................. 14
Step 10. Programming ........................................................................................................................................................... 14
Step 11. Operating Your Thermostat ...................................................................................................................................... 17
Step 12. Set the Fan and System Switches ........................................................................................................................... 19
If You Have a Problem ........................................................................................................................................................... 20
Wiring Diagrams .................................................................................................................................................................... 22

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Total comfort temperature management with Smart Response™ Technology
Congratulations! You made a smart choice by purchasing your new Honeywell thermostat; the smart thermostat that:
•Keeps you comfortable by automatically calculating exactly when the furnace or air conditioning should go on to
have the house at the desired comfort temperature by the time you wake up or return home.
•Saves the maximum amount of energy and money by automatically remembering to adjust the temperature when
you leave home or go to sleep.
•Provides the ultimate in comfort and convenience. It comes preprogrammed. You can use the preprogrammed
schedule, or set your own.
This manual answers many of the questions that can arise as you become familiar and comfortable with your
Honeywell thermostat — the state of the art in home comfort controls.
Read these instructions carefully. Failure to follow these instructions can damage the product or cause a hazardous
condition.
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 for instructions regarding recycling and the proper
disposal of this control, or of an old control containing mercury in a sealed
tube.
M10614
MERCUR
Y
SWITCH
TYPICAL LOCATION OF A MERCURY
SWITCH IN A THERMOSTAT

3 69-1532—2
M14880
Time Set Program
System
Fan
On Auto
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
INCREASE TEMPERATURE
SETTING OR SCROLL
FORWARD THROUGH
INSTALLER SETUP OPTIONS
DECREASE TEMPERATURE
SETTING OR SCROLL
BACKWARD THROUGH
INSTALLER SETUP OPTIONS
DISPLAY INFORMATION
SUCH AS PRESENT
SETTINGS AND OUTDOOR
TEMPERATURE
RETURN TO
NORMAL
OPERATIONS
ENTER
INDEFINITE
OR TIMED
HOLD MODE
SET CURRENT
DAY AND TIME
SET CURRENT OR
PROGRAM DAY
CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME
INCREASE TIME SETTING
OR SCROLL FORWARD
THROUGH INSTALLER SETUP
A
ND SYSTEM TEST
DECREASE TIME SETTING OR
SCROLL BACKWARD THROUGH
INSTALLER SETUP AND SYSTEM TEST
COPY ONE PROGRAMMED
DAY TO ANOTHER DAY
SET WAKE TIMES
AND SETPOINTS
CHANGE BETWEEN
HEATING AND COOLING
SETPOINTS
SET LEAVE TIMES
AND SETPOINTS
SET RETURN TIMES
AND SETPOINTS
SET SLEEP TIMES
AND SETPOINTS
SYSTEM SWITCH
FAN SWITCH
Off CoolHeat

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Mon
Wake Leave Return Sleep
Room
Wait
System
Heat
Off
Cool
AM
Hold for
Repl Batt
Recovery
DST
Tue Wed Thu Fri Sat Sun
Days
Temporary Setting
Set Program
DISPLAYS EITHER CURRENT
TIME OF DAY OR PROGRAM TIMES
SHOWS TEMPERATURE SETTING
CHANGED FOR THIS PROGRAM PERIOD
SHOWS THE TEMPERATURE
DISPLAYED IS THE CURRENT
SET TEMPERATURE
SHOWS THE TEMPERATURE
DISPLAYED IS THE CURRENT
ROOM TEMPERATURE
SHOWS THE BATTERIES
ARE LOW AND MUST BE
REPLACED
DISPLAYS
EITHER ROOM
OR SET
TEMPERATURES
SHOWS SMART
RESPONSE IS OFF.
CONVENTIONAL
RECOVERY IS ON
SHOWS SMART
RESPONSE
IS CHANGING
THE TEMPERATURE
TO MEET THE
CURRENT
PROGRAMS
SHOWS THAT
THERMOSTAT IS
"CALLING" FOR
HEAT OR COOL
SHOWS CURRENT
SYSTEM SWITCH
POSITION
HEAT/OFF/COOL
SHOWS CURRENT
PROGRAM PERIOD
OR PERIOD BEING
PROGRAMMED
SHOWS CURRENT
DAY OR DAYS
BEING
PROGRAMMED
SHOWS
VACATION
HOLD
DURATION
SHOWS WHEN THERMOSTAT IS
IN THE PROGRAMMING MODE
SHOWS SYSTEM ON
DAYLIGHT SAVINGS TIME
SHOWS THERMOSTAT IS
PROCESSING INFORMATION
AND WAITING TO CALL FOR
HEAT OR COOL
M18746

5 69-1532—2
STEP 1. PREPARE FOR INSTALLATION
!Check the contents of your thermostat package to be sure all items are included.
Package Contents
• Thermostat • Wallplate • Owner’s Guide
• Wiring labels • Screws and anchors
!Locate the required tools to install your thermostat.
Tools Required
• Screwdriver • Drill • Drill bits: 3/16 in. for drywall;
• Hammer • Needle-nose pliers 7/32 in. for plaster
• Level
STEP 2. REMOVE OLD THERMOSTAT
!Test your heating and cooling systems to make sure they work properly. If either system does not work, contact
your local heating/air-conditioning dealer. To avoid compressor damage, do not operate the cooling system when
outdoor temperature is below 50°F (10°C).
!Turn off power to the system at the furnace or the fuse/circuit breaker panel.
!Carefully unpack your new thermostat and wallplate. Save package of screws, instructions, and receipt.
!Remove the cover from the old thermostat. If the cover does not snap off when pulled firmly from the bottom, check
for a screw or screws used to lock on the cover.
!Loosen the screw or screws holding the thermostat to the wallplate and lift the thermostat away.
!Disconnect the wires from the old thermostat. As you disconnect each wire, attach the enclosed labels with the old
terminal designation. If there are only two wires, they do not need to be labeled. Wrap the wires around a pencil as
shown to keep them from falling back into the wall.
Special Installations
Read this section if you are replacing:
• Clock thermostat with separate wires for the clock.
• Thermostat with six or more wires connected to it.
• Thermostat in a heating only system with three wires.
WIRES THROUGH
WALL OPENING
M5136

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Replacing a Clock Thermostat that has C or C1 Clock Terminals
When replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires going to the C or C1 clock
terminals on the Chronotherm wiring wallplate. Do not allow them to touch, or you can damage the transformer.
Disconnect the wires and wrap them separately using electrical tape. Do not wrap them together. Place the wires
where they will not interfere with the operation of the new thermostat. Record the colors and terminal designation
labels of the remaining wires.
Replacing a Thermostat that has Six or More Wires
If there are six or more wires (excluding clock wires attached to terminals), you probably have a variation of a
multistage heat pump or other multistage system. This thermostat is not compatible with multistage systems, so return
the product to the place of purchase. For information about which programmable thermostats will work with your
system, call Honeywell Customer Care at 1-800-468-1502.
Replacing a Thermostat that has Three Wires
If you have three wires for a heating only system and can operate the fan using the fan On switch this thermostat works
with your system. However, some hot water (zoned) heating systems also have three wires. Your thermostat will work
only if you install an isolating relay on these systems. For details, call your local heating and/or cooling contractor.
STEP 3. MOUNT THERMOSTAT WALLPLATE
!Separate wallplate from thermostat by placing your thumbs between bottom of wallplate
and thermostat and pulling wallplate up and away from thermostat. See illustration.
!Position wallplate on wall. Level wallplate
for appearance, if desired. Use a pencil to mark
two mounting holes that best fit the application.
!Remove wallplate from wall. Drill two 3/16 in.
holes in wall (if drywall) as shown.
For plaster or wood, drill 7/32 in. holes as
marked. Gently tap (provided) anchors into
drilled holes until flush with wall.
!Reposition wallplate over holes. Pull wires
through wiring opening. Loosely insert mounting
screws into each of the holes.
!Level wallplate, if desired. Thermostat
functions correctly, even when not level.
!Tighten mounting screws.
M16427
WIRES
THROUGH WALL
WALL
MOUNTING
HOLES
M15044
MOUNTING
SCREWS
WALL
ANCHORS (2)

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STEP 4. WIRE WALLPLATE TERMINALS
IMPORTANT
All wiring must comply with local codes and ordinances.
If unsure about household wiring procedures, call your
local heating/air-conditioning contractor.
Refer to the labels you placed on the wires when you removed
the old thermostat (see illustration).
!Match the letter of old thermostat wire with the corresponding
terminal letter on new thermostat. Refer to Table 1.
!Remove factory-installed jumper connecting terminals R and
RC if wires are connected to both of those terminals.
!For wiring diagrams, if needed, see Wiring Diagrams section.
!Loosen terminal screws. Slip each wire beneath matching
terminal. Wraparound and straight connections are both
acceptable, (see illustration). Tighten terminals.
!Plug the hole in the wall with insulation to help prevent
drafts from adversely affecting thermostat operation.
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM).
M16425
R
W
Y
G

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Table 1. Terminal Designations on Old and New Thermostats.
aIf both RH and R terminals are present on existing thermostat, remove jumper and connect Rh to R and R to Rc.
bDo not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B.
cTape off end of the wire with electrical tape and push the taped wire back into the wiring hole in the wall.
STEP 5. INSTALL THE BATTERIES
IMPORTANT
Three fresh AA alkaline batteries must be installed for pro-
gramming and operation of the thermostat and the heating/
cooling system.
!Install the batteries in the wallplate so the positive terminals all
point up (see illustration).
!If the thermostat is already mounted on the wall, remove the
thermostat by placing your thumb between the thermostat and
wallplate and pulling the thermostat up and away as shown
on the next page.
Terminal on Old Thermostat Connect To Description
R, RHa, 4, V RPower
Rc, RaRc Power for cooling
W, W1, H W Heat
Y, Y 1, M Y Cooling
G, F G F an
O O Changeover in cool. (Single stage heat pump only).
BbBbChangeover in heat. (Single stage heat pump only).
Cc, Xc, BbDo not connect. Transformer common
W2, H2Do not continue installation.
Call 1-800-468-1502.
Second stage heat.
Y2Second stage cool.
M10622
INSTALL 3 AA ALKALINE BATTERIES
AS SHOWN, POSITIVE (+) TERMINALS
TOWARD TOP.
WALLPLATE
B
RRCOWY G

9 69-1532—2
!When the batteries are running low, a REPL BAT message flashes for one
to two months before the batteries run out completely. Replace the
batteries as soon as possible once the message flashes.
IMPORTANT
Although the thermostat has a low battery indicator, replace the
batteries once per year to prevent leakage and to prevent the ther-
mostat and heating/cooling system from shutting down due to lack
of battery power in the thermostat.
!If you insert new batteries within 20 to 30 seconds of removing the old
batteries, the system retains the current time and day. If the display is
blank, the batteries are dead or installed incorrectly. You must reset the
time and day. Refer to Step 9. Set the Clock for instructions.
As a precaution when leaving home for longer than a month,
change batteries before leaving to prevent the system from
shutting down due to lack of power. Always use fresh alkaline
batteries. Nonalkaline batteries do not last as long and can
leak, causing damage to the thermostat and the wall surface.
STEP 6. SET FAN OPERATION SWITCH
The thermostat fan operation switch, labeled FUEL SWITCH, is factory
set in the F position. This is the correct setting for most systems. If your
system is an electric heat system, set the switch to E. The E setting
allows the fan to turn on immediately with the heating and cooling in a
system where the G terminal is connected.
M16424
80
90
70
60
90
80
70
60
M12676
FUEL SWITCH

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STEP 7. MOUNT THE THERMOSTAT
STEP 8. CUSTOMIZE YOUR THERMOSTAT
Your Honeywell CT8602 Thermostat comes preset to the most commonly used settings. The settings are:
• Gas or oil forced air furnace.
• Smart Response Technology on.
• Temperature °F.
• 12-hour clock format.
You can change any or all of these settings.
IMPORTANT
Always press the keys with your fingertip or a similar blunt tool. Sharp instruments like pens and pencil
points can damage the keyboard.
!Press and hold down , , and simultaneously until the display shows two numbers.
You now can change any of these settings.
M12703A
B. PRESS LOWER
EDGE OF CASE
TO LATCH.
A. ENGAGE TABS AT TOP
OF THERMOSTAT
A
ND WALLPLATE.