Honeywell CT8602 User manual

69-1532—2

OWNER’S GUIDE

® U.S. Registered Trademark

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

69-1532—2 2

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

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

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

69-1532—2 4

Mon

Wake Leave Return Sleep

Room

Wait

System

Heat

Off

Cool

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

69-1532—2 6

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)

7 69-1532—2

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

69-1532—2 8

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

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

M12676

FUEL SWITCH

69-1532—2 10

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

ND WALLPLATE.

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