Honeywell CT8602 Programmable Thermostat User Guide

: June 9, 2024
: Honeywell

Table of Contents

CT8602 Programmable Thermostat
References
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CT8602 Programmable Thermostat

Honeywell CT8602
PROGRAMMABLE THERMOSTAT

OWNER’S GUIDE

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 ………………………………………………………………………………………………………………. 6 Step 3. Mount thermostat Wallplate …………………………………………………………………………………………………………… 7 Step 4. Wire Wallplate Terminals ………………………………………………………………………………………………………………. 8 Step 5. Install the Batteries ………………………………………………………………………………………………………………………. 9 Step 6. Set Fan Operation Switch …………………………………………………………………………………………………………….. 10 Step 7. Mount the Thermostat ………………………………………………………………………………………………………………….. 11 Step 8. Customize Your Thermostat ………………………………………………………………………………………………………….. 11 Step 9. Set the Clock ………………………………………………………………………………………………………………………………. 13 Step 10. Programming …………………………………………………………………………………………………………………………….. 14 Step 11. Operating Your Thermostat …………………………………………………………………………………………………………. 17 Step 12. Set the Fan and System Switches ……………………………………………………………………………………………….. 19 If You Have a Problem …………………………………………………………………………………………………………………………….. 19 Smart ResponseTM Technology ………………………………………………………………………………………………………………… 21 Wiring Diagrams …………………………………………………………………………………………………………………………………….. 22

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Total comfort temperature management with Smart ResponseTM 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.

MERCURY SWITCH

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TYPICAL LOCATION OF A MERCURY SWITCH IN A THERMOSTAT
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INCREASE TIME SETTING OR SCROLL FORWARD THROUGH INSTALLER SETUP AND SYSTEM TEST

SET WAKE TIMES AND SETPOINTS

SET CURRENT DAY AND TIME

SET LEAVE TIMES AND SETPOINTS

SET RETURN TIMES AND SETPOINTS

RETURN TO NORMAL OPERATIONS
ENTER INDEFINITE OR TIMED HOLD MODE
SET CURRENT OR PROGRAM DAY
CHANGE BETWEEN DAYLIGHT SAVINGS AND STANDARD TIME

Run Program

Set Current Day/Time

Hold Temp

Day

Daylight Time

Time

Wake

Heat/Cool Settings
Copy

Set Program

Leave

Return

Sleep

Heat Off Cool System
On Auto Fan

COPY ONE PROGRAMMED DAY TO ANOTHER DAY

DECREASE TIME SETTING OR SCROLL BACKWARD THROUGH INSTALLER SETUP AND SYSTEM TEST

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
SET SLEEP TIMES AND SETPOINTS
SYSTEM SWITCH
FAN SWITCH

CHANGE BETWEEN

HEATING AND COOLING

SETPOINTS

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SHOWS WHEN THERMOSTAT IS IN THE PROGRAMMING MODE
SHOWS THERMOSTAT IS PROCESSING INFORMATION AND WAITING TO CALL FOR HEAT OR COOL

DISPLAYS EITHER CURRENT TIME OF DAY OR PROGRAM TIMES
SHOWS TEMPERATURE SETTING CHANGED FOR THIS PROGRAM PERIOD

SHOWS SMART

RESPONSE

IS CHANGING

THE TEMPERATURE

TO MEET THE

CURRENT PROGRAMS

Wait Set Program

Set Day/Time Temporary Setting

SHOWS VACATION HOLD DURATION

Recovery

AM

Hold for

Days Mon Tue Wed Thu Fri Sat Sun Repl Batt Room Filter

SHOWS THE TEMPERATURE DISPLAYED IS THE CURRENT SET TEMPERATURE

System Heat Off
Cool

SHOWS CURRENT SYSTEM SWITCH POSITION HEAT/OFF/COOL
SHOWS THAT THERMOSTAT IS “CALLING” FOR HEAT OR COOL

Wake Leave Return Sleep

SHOWS CURRENT DAY OR DAYS BEING PROGRAMMED

SHOWS THE BATTERIES ARE LOW AND MUST BE REPLACED

DST

DISPLAYS EITHER ROOM OR SET TEMPERATURES

SHOWS SMART RESPONSE IS OFF. CONVENTIONAL RECOVERY IS ON

SHOWS CURRENT PROGRAM PERIOD OR PERIOD BEING PROGRAMMED

SHOWS SYSTEM ON DAYLIGHT SAVINGS TIME

SHOWS THE TEMPERATURE DISPLAYED IS THE CURRENT ROOM TEMPERATURE

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STEP 1. PREPARE FOR INSTALLATION

Check Table 1, the compatibility chart, to make sure the thermostat is compatible with your system. If your system is not compatible, call Honeywell Customer Relations Center, toll-free, 1-800-468-1502.

Table 1. Compatibility Chart.

System Type Gas — Standing Pilot Gas — Electronic Ignition Gas-fired Boilers Gas –750 Millivolt Heat onlyb Oil-Fired Boilers Oil-Fired Furnace Electric Furnace Electric Air Conditioning Baseboard Electric (120/240 line volt)c Single Stage Heat Pump Multistage Heat Pumps/Multistage Equipment

Compatibility with CT8602 Yes Yes Yesa Yes
Yesa Yes Yes Yes No Yes No

a Compatible with 2-wire Honeywell and Taco zone valves. Not compatible with 3-wire zone valves or 2-wire White Rodgers no. 1361 zone valves.
b Millivolt system must be heat only. c Not compatible with any 120/240 volt system.

Package Contents
· Thermostat · Wiring labels

· Wallplate · 3 Energizer® AA batteries

· Screws and anchors · Owners manual

Tools Required
· Screwdriver · Drill

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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

Replacing a Clock Thermostat that has C or C1 Clock Terminals

M5136

If you are 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. If you have questions regarding this thermostat please visit our web site at www.honeywell.com/yourhome, or call the 24-hour automated information line 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.

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STEP 3. MOUNT THERMOSTAT WALLPLATE

Separate the wallplate from the thermostat by placing your thumb or fingers between the bottom of the wallplate and the thermostat, and pulling the wallplate up and away from the thermostat. See illustration at right.
Position the wallplate on the wall. Level the wallplate for appearance if desired. Use a pencil to mark the two mounting holes that best fit the application.
Remove the wallplate from the wall. Drill two 3/16 in. holes in wall (if drywall) as shown. For materials such as plaster or wood, drill 7/32 in. holes where marked. Gently, tap the (provided) anchors into the drilled holes until they are flush with the wall.
Reposition the wallplate over the holes. Pull the wires through the wiring opening. Loosely insert mounting screws into each of the holes.
Level the wallplate if desired. Thermostat functions properly when not level. Tighten mounting screws.

WIRES THROUGH WALL

WALL

WALL ANCHORS (2)

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MOUNTING HOLES MOUNTING SCREWS M15044
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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 your old thermostat wire with the corresponding
terminal letter on your new thermostat. Refer to Table 2. Remove the factory- installed jumper connecting terminals R and RC if
wires are connected to both of those terminals. For wiring diagrams, if needed, see pp 22-23. Loosen the terminal screws. Slip each wire beneath its matching
terminal. Wraparound and straight connections are both acceptable, (see illustration). Tighten the terminals.

FOR WRAPAROUND INSERTION STRIP 7/16 IN. (11 MM).

FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM).

Y G

R W
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Plug the hole in the wall with insulation to help prevent drafts from adversely affecting thermostat operation.

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Table 2. Terminal Designations on Old and New Thermostats

Terminal on Old Thermostat

Connect To

Description

R, RHa, 4, V

R

Power

Rc, Ra

Rc

Power for cooling

W, W1, H

W

Heat

Y, Y1, M

Y

Cooling

G, F

G

Fan

O

Changeover in cool. (Single stage heat pump only).

Bb

Changeover in heat. (Single stage heat pump only).

Cc, Xc, Bb

Do not connect.

Transformer common

W2, H2 Y2

Do not continue installation. Second stage heat.

Call 1-800-468-1502.

Second stage cool.

a If both RH and R terminals are present on existing thermostat, remove jumper and connect Rh to R and R to Rc. b Do not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B. c Tape 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 AA alkaline batteries are included with the thermostat. Batteries must be installed for programming 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.

WALLPLATE
B
R RC O W Y G
INSTALL 3 AA ALKALINE BATTERIES AS SHOWN, POSITIVE (+) TERMINALS TOWARD TOP.

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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 thermostat 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 Set the Clock for instructions.
M16424

As a precaution when leaving home for longer than a month, change batteries before leaving to prevent

60 70 80 90

the system from shutting down due to lack of power. Always use fresh alkaline batteries. Nonalkaline

60 70 80 90

batteries do not last as long. They also can leak, causing damage to the thermostat and the wall surface.

Honeywell recommends Energizer® batteries.

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.

FUEL SWITCH

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STEP 7. MOUNT THE THERMOSTAT

A. ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.

B. PRESS LOWER EDGE OF CASE TO LATCH.

M12703
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.

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Press and hold down , , and , simultaneously until the screen shows. You now can change any of these settings.
System Type (Feature Number 4)
System type options are: 1 = Gravity or steam system. 3 = Hot water, high efficiency furnace (90% or better), or single stage heat pump. 6 = Gas or oil forced air furnace (preset). 9 = Electric furnace.

To change your system type:

Press until display shows your furnace or boiler type.

Press Time

to move to next feature or

Run Program

to return to main display.

Smart ResponseTM Technology (Feature Number 13)
Smart Response technology options are: 0 = Smart Response technology on (preset). 1 = Smart Response technology off.

To turn Smart Response technology on or off:

Press once.

Press Time

to move to next feature or

Run Program

to return to main display.

NOTE: See Smart Response technology (page 21) for information about this feature.

Temperature Format (Feature Number 14)
Temperature format options are: 0 = °F (preset). 1 = °C.

To change temperature format:

Press once.

Press Time

to move to next feature or

Run Program

to return to main display.

FEATURE NUMBER

OPTION M18750

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Time Format (Feature Number 16)
Time format options are: 0 = 12-hour clock (preset). 1 = 24-hour clock.

To change time format:

Press once.

Press

Run Program

to return to main display.

Heating Temperature Range Stops (Feature Number 34)
Temperature range options are: 90 = highest setting for heating setpoint (preset) 40 to 89 = temperature range (1°F increments) heating setpoint can be set to.

Cooling Temperature Range Stops (Feature Number 35)
Temperature range options are: 45 = lowest setting for cooling setpoint (preset) 46 to 99 = temperature range (1°F increments) cooling setpoint can be set to.

Factory Set Function (Feature Number 37)
Do not change this setting.

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STEP 9. SET THE CLOCK

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Set Current Day and Time

NOTE: On initial power-up, the screen flashes 1:00 pm until you press a key.

Press . Set Current Day/Time

Press Day until screen shows current day.

Press Time

or

hour increments).

until screen shows current time. (Tapping the

Set Current Day/Time

will advance the time in one

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Press

Daylight Time

until “DST” displays if daylight savings time is in effect.

Press

Run Program

.

STEP 10. PROGRAMMING
The keyboard is located behind the thermostat cover. The three most frequently used keys are near the display. Pressing displays the current temperature settings. Pressing the and keys change the temperature. The thermostat displays day, time, program period, temperature, system and fan settings.
There is an individual key for each of the four program periods: Wake –The program period when you want the house at a comfortable temperature when you get up and while you get ready for work or school. (This is a higher temperature during the heating season and a lower temperature during the cooling season). Leave –The program period you can set for an energy-saving temperature while you are away at work or school. (This is a lower temperature during the heating season and a higher temperature during the cooling season). Return –The program period when you want the house at a comfortable temperature for activities before bedtime. (This is a higher temperature during the heating season and a lower temperature during the cooling season). Sleep –The program period you can set for an energy-saving temperature while you sleeping. (This is a lower temperature during the heating season and a higher temperature during the cooling season).

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Table 3 can be helpful when planning your schedule of time and temperature settings. The thermostat default settings are shown in parentheses ( ).

Table 3. Personal Programming Table.

Monday Tuesday Wednesday Thursday Friday

Period Default Setting (Mon)

(Tue)

(Wed)

(Thu)

(Fri)

Wake Time (6:00AM)

Heata (70°F/21°C)

Coolb (78°F/25.5°C)

Leave Time (8:00AM)

Heata (62°F/16.5°C)

Coolb (85°F/29.5°C)

Return Time (6:00PM)

Heata (70°F/21°C)

Coolb (78°F/25.5°C)

Sleep Time (10:00PM)

Heata (62°F/16.5°C)

Coolb (82°F/28°C)

a Your heating setpoints cannot be higher than 90°F (32°C) or lower than 40°F (4.5°C). b Your cooling setpoints cannot be higher than 99°F (37°C) or lower than 45°F (7°C).

Saturday Sunday

(Sat)

(Sun)

Program the First Day
Start by programming the wake time and temperature for one day.

Press and release Wake .

Press Day until the desired day displays. (Mon, Tue, Wed, Thu, Fri, Sat, Sun)

Press time

or

until the desired time shows in the display.

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NOTE: Program times are in 15 minute intervals. For example, 8:00, 8:15, 8:30.

Press or until the desired wake temperature displays. The setpoint temperature range is 40°F to 90°F (4.5°C to 32°C) for heating and 45°F to 99°F (7°C to 37°C) for cooling.

Press Heat/Cool Settings

to switch between setpoints.

NOTE: Program times are the same for heating and cooling.

Press or until the display shows the desired temperature setpoint.

Press

, Leave

Return

or

Sleep

and repeat these steps for each program period. The First Day is now

programmed.

Repeat each step in Program the First Day for the rest of the week.

NOTE: After the first day is programmed, you can copy that day to any other day using procedure in Copy a Day.

Press

Run Program

when the entire week is programmed.

Copy a Day
Your thermostat can copy program settings from one day to another.

Press

Wake

,

, Leave

Return

or

Sleep

to enter programming mode.

Press Day until the display shows the day you want to copy.

Press Copy . The display shows.

Mon

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Press Day until the display shows the day you want to copy to.

Mon Wed

Press Copy to accept the change. Repeat these steps for each day you want to copy. NOTE: donE appears for two seconds and then the normal program display appears.
Clear a Program Period
NOTE: Wake cannot be cleared.

M13328 M13329

Press

, , or Leave

Return

Sleep

for the program period you want to clear.

Press Day until the desired day displays.

Press and hold the

, , or Leave

Return

Sleep

for approximately 3 seconds until the time and temperature clear.

Repeat the above steps for each period to be cleared.

Press

Run Program

.

STEP 11. OPERATING YOUR THERMOSTAT

Change Temperature Setting Until the Next Program Period (Temporary Change)
Press or until the screen shows the desired temperature setting.

NOTE:

The temporary temperature setting is displayed for about 3 seconds and then the room temperature is displayed. Temporary appears in the display. The setting cancels when the next program period starts or when

you press

Run Program

.

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Change Temperature Setting Indefinitely (Hold)
Move the System switch to the desired position (Heat or Cool).

Press Hold Temp then or to change your setting if desired. (The display changes from showing the setpoint temperature to room temperature after approximately three seconds).

To cancel “Hold” press

Run Program

.

Change the Temperature Setting Until a Designated Day and Period (Vacation Hold)

Press Hold Temp twice. Press or until the display shows the desired temperature setpoint.

Press Time

until the desired number of days that you will be away (1 through 255) is displayed.

Press

, Wake

, Leave

Return

or

Sleep

to select the program period when you want the program to restart.

NOTE:

If the Vacation Hold needs to be cancelled before the designated time, press

Run Program

to return to the

program.

Daylight Savings Time Key
This feature allows you to switch between standard time and daylight savings time.

Press

Daylight Time

during fall to set the time back one hour.

Press

Daylight Time

during the spring to set time forward one hour. DST is displayed when operating on daylight savings

time.

NOTE:

Pressing the Daylight Time key more than once in a five minute period scrolls you through various time option. For example, one hour earlier or later, with or without DST. Pressing Daylight Time six times in a five minute period returns you to your original setting.

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STEP 12. SET THE FAN AND SYSTEM SWITCHES

First set the fan switch.

Fan On: The fan runs continuously. Use for improved air circulation or for more efficient central air cleaning. (In a heat-only system, fan runs continuously only if fan relay is connected to the G thermostat terminal).
Fan Auto: Normal setting for most homes. The equipment controls the fan operation.

Then set the system switch.

Heat: The thermostat controls your heating system.

Off: Both the heating and air conditioning systems are off.

Cool: The thermostat controls your air conditioning system.

On Fan
On Fan
Heat Off System
Heat Off System
Heat Off System

Auto Auto
Cool Cool Cool

IF YOU HAVE A PROBLEM

Table 4. Solution Guide.

If…

Display does not appear.

·

Temperature settings will not change · (example; cannot set the heating higher or the cooling lower).
·

Then…
Make sure the batteries are installed correctly. Make sure the thermostat is mounted and latched on the wallplate. Mount and latch the thermostat on the wallplate if it is not.
Make sure the temperature setpoints are: 40 to 90°F (4.5 to 32°C) for heating. 45 to 99°F (7 to 37°C) for cooling. Check Customize Your Thermostat section feature numbers 34 and 35. Reset as necessary.

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If… Heating does not come on.
Cooling does not come on.
System on indicator( = heat, = cool) is lit, but no warm or cool air is coming from the registers. Display flashes during programming. Temperature change occurs at the wrong times.
Thermostat backlight appears dim.

Table 4. Solution Guide.
Then…
· Make sure the heating setpoint is above the room temperature. · Make sure the circuit breaker is not tripped, and reset it if necessary. · Make sure the power switch at the equipment is in the On position, and
set it to On if it is in the Off position. · Wait five minutes for the system to respond. · Set the system switch to Heat.
· Make sure the cooling setpoint is below the room temperature. · Make sure the circuit breaker is not tripped, and reset it if necessary. · Make sure the system switch at the air conditioner is in the On position,
and set it to On if it is in the Off position. · Wait five minutes for the system to respond. · Set the system switch to Cool.
Wait five minutes after seeing the flame or snowflake and check the registers again. If no there is no hot or cool air coming from the registers, refer to Heating does not come on or Cooling does not come on. If all of this has been checked, contact your local heating and cooling contractor.
The temperature setting limit has been reached. The heating setting range is 40°F to 90°F (4.5°C to 32°C). The cooling setting range is 45°F to 99°F (7°C to 37°C).
1. Check the program times for the period in question. 2. Make sure the AM and PM settings are correct. 3. Make sure the current time and day settings are correct. 4. Reprogram any incorrect settings. NOTE: If your thermostat is set for Smart ResponseTM technology, the
start times occur before your programmed comfort periods.
· Wait until Replace Battery indicator is illuminated and replace batteries. · Replace batteries now.

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Toll-Free Customer Assistance
Please read and follow the provided instructions for this thermostat. If you have questions regarding this thermostat please visit our web site at www.honeywell.com/yourhome, or call the 24-hour automated information line at 1-800468-1502.
Before calling, please have the following information available: · Thermostat model number. (Located on back of thermostat). · Thermostat date code. (Located below model number). · Type of heating/cooling system (for example, hot water, warm air, oil, or gas). · Location and number of wires connected to the thermostat.

SMART RESPONSETM TECHNOLOGY

Your CT8602 is actually a small computer. The Smart Response technology calculates the correct time of day to turn on your heating or cooling system. Smart Response technology considers the following information. · Air temperature. · Wall temperature. · The time of day when you want the comfort temperature established.

When the thermostat activates Smart Response technology, the thermostat displays In Recovery, changes the setpoint, and turns on the system. · Your CT8602 thermostat learns from
experience. Each day it checks how closely it hit the recovery target and then adjusts the next day’s recovery start time accordingly. · It takes a few days after installation for the thermostat to adjust to the local weather, your lifestyle, the construction of your home, and your heating/cooling system. · You can turn off Smart Response technology by selecting Conventional Recovery. See Step 8. Customize Your Thermostat.

TEMPERATURE

System Operating in Comfort Mode

68°F

Recovery Continues

AM
Mon Wake
System Heat

Room

66°F 64°F

System Operating in Energy Savings Mode

Recovery Begins

Mon
System Heat

AM
Heat Sleep In Recovery

Mon System Heat
Room

AM Heat
Sleep In Recovery
1

Room

62°F

Mon
System Heat

AM Sleep
5:00

Room

5:30

6:00

6:30

ENERGY SAVINGS PERIOD

RECOVERY FROM ENERGY SAVINGS TIME

COMFORT PERIOD

THERMOSTAT USES THE SAME SCHEME TO RETURN TO LOWER COMFORT TEMPERATURE DURING THE COOLING SEASON.

1 IF In Recovery IS DISPLAYED, PRESS

TO SEE THE COMFORT SETPOINT.

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WIRING DIAGRAMS

2-WIRE HEAT-ONLY (JUMPER INTACT)

THERMOSTAT B

RC O W Y

R

G

4-WIRE HEAT/COOL (JUMPER INTACT)

THERMOSTAT B

RC O W Y

R

G

HEATING RELAY OR VALVE COIL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

1 M10616

3-WIRE HEAT ONLY WITH FAN (JUMPER INTACT)

THERMOSTAT B

RC O W Y

R

G

HEATING

COOLING

FAN

RELAY OR

CONTACTOR RELAY

1

VALVE COIL COIL

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
4-WIRE SINGLE-STAGE HEAT PUMP (JUMPER INTACT)

M10617

THERMOSTAT B

RC O W Y

R

G

3

HEATING RELAY OR VALVE COIL

FAN RELAY

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

1 M10618

2

COMPRESSOR

HEAT CHANGEOVER

CONTACTOR 2

VALVE

1

COOL CHANGEOVER

FAN

VALVE

RELAY

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.
3 USING A JUMPER WIRE (NOT SUPPLIED) CONNECT W TO Y. M12739

69-1532

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5-WIRE HEAT/COOL (JUMPER REMOVED)

THERMOSTAT B

RC O W Y

R

G

5-WIRE HEAT/COOL WITH DAMPER (JUMPER INTACT)

THERMOSTAT B

RC O W Y

R

G

HEATING RELAY OR VALVE COIL
1

FAN RELAY

COOLING CONTACTOR COIL
1

1 POWER SUPPLY. PROVIDE

DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

M10619

HEAT DAMPER

HEAT RELAY

COMPRESSOR CONTACTOR

COOL DAMPER
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

FAN RELAY

1 M18738

Notice:
This thermostat is a Class B digital apparatus that complies with Canadian Radio Interference Regulations, CRC c. 1374.

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69-1532

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 Honeywells 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 from which 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 Return Goods

Honeywell Canada:

Dock 4 — MN10-3860

Honeywell Limited/Honeywell Limitée

1885 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN 55422

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 Customer Assistance, Honeywell, 1885 Douglas Drive North, Golden Valley, MN 55422-4386. In Canada, write Retail Products ON30 Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.

Home and Building Control Honeywell 1985 Douglas Drive North Golden Valley, MN 55422

Home and Building Control Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9

69-1532 J.H. 04-01

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