Honeywell CT3550 User Manual

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Weekday, Saturday and Sunda

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Programmable Heat and/or Cool
Low Volta
Model CT3550

20 to 30 Vac) Thermostat and Wallplate

Honeywell CT3550

PROGRAMMABLE THERMOSTAT

OWNER’S GUIDE

Para pedir estas instrucciones en español, llame al 1-800-468-1502.
Pour obtenir ce ode demploi en fran

ais, composer le 1-800-468-1502.

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. Mount the Thermostat ................................................................................................................................... 10

Step 7. Customize Your Thermostat .......................................................................................................................... 11

Step 8. Set the Clock ................................................................................................................................................. 13

Step 9. Pro
Step 10. Operatin
Step 11. Set the Fan and S
Smart Response™ Technolo
Wirin

® U.S. Registered Trademark
Cop

ramming ................................................................................................................................................ 13

Your Thermostat ......................................................................................................................... 16

Diagrams ........................................................................................................................................................ 21

ht © 2001 Honeywell • •All Rights Reserved

stem Key ...................................................................................................................... 17

................................................................................................................................. 20

Place Bar Code Here

69- 1284- 2

Total comfort temperature management with Smart Response™ Technology.

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Congratulations! You made a smart choice by purchasing your new Honeywell thermostat the smart thermostat that;

• Keeps

• Saves the maximum amount of ener

• Provides the ultimate in comfort and convenience. It comes prepro

ou comfortable by automatically calculating exactly when the furnace or air conditioning should go on to

have the house at the desired comfort temperature b

ou leave home or go to sleep.

schedule, or set

our own.

and money by automatically remembering to adjust the temperature when

the time you wake up or return home.

rammed. You can use the preprogrammed

This manual answers man

well thermostat — the state of the art in home comfort controls.

Hone

Read these instructions carefull
condition.

of the questions that can arise as you become familiar and comfortable with your

. Failure to follow these instructions can damage the product or cause a hazardous

MERCURY NOTICE

If this thermostat is replacing a control that contains mercury in a
sealed tube, do not place

our local waste management authority for instructions regarding

cling and the proper disposal of this control, or of an old

rec
control containin

If

ou have questions, call Honeywell Inc. at 1-800-468-1502.

69-1284—22

mercury in a sealed tube.

our old control in the trash. Contact

TYPICAL LOCATION OF A MERCURY
SWITCH IN A THERMOSTAT

MERCURY
SWITCH

M10614

DIGITAL DISPLAY

SET CURRENT
DAY/TIME

SETS CURRENT
TIME AND DAY

RUN PROGRAM

RETURNS
THERMOSTAT
TO NORMAL
OPERATING MODE

HOLD TEMP

SETS A HOLD
TEMPERATURE
SETTING AND
ACTIVATES
VACATION HOLD
FEATURE

DAY

SETS DAY OF
THE WEEK

TIME /TIME

SETS TIME FORWARD OR BACK

Run

Program

Hold Temp

Set Current

Day/Time

Day

Time Set Program

Heat/Cool

Fan

Wake

Settings

System

Leave

Return Sleep

RAISES

TEMPERATURE SETTING

LOWERS

TEMPERATURE SETTING

DISPLAYS

CURRENT HEAT/COOL
TEMPERATURE SETTING

PROGRAM PERIODS

WAKE/LEAVE/RETURN/SLEEP:
ENTERS PROGRAMMING MODE

HEAT/COOL SETTING

SWITCHES BETWEEN
HEAT SETPOINTS AND
COOL SETPOINTS
WHILE PROGRAMMING

SYSTEM KEY

SELECTS HEAT/OFF/COOL

FAN KEY

SELECTS AUTO/ON

M18741

3 69-1284—2

DISPLAYS EITHER CURRENT
TIME OF DAY OR PROGRAM TIMES

SHOWS WHEN
THERMOSTAT IS IN THE
PROGRAMMING MODE

SHOWS THERMOSTAT IS IN
THE SET DAY/TIME MODE

SHOWS TEMPERATURE SETTING
CHANGED FOR THIS PROGRAM PERIOD

SHOWS VACATION
HOLD DURATION

Set Program

SHOWS CURRENT
DAY OR DAYS BEING
PROGRAMMED

SHOWS CURRENT
PROGRAM PERIOD
OR PERIOD BEING
PROGRAMMED

SHOWS CURRENT
SYSTEM KEY POSITION
HEAT/OFF/COOL

SHOWS THAT THERMOSTAT IS
"CALLING" FOR HEAT OR COOL

SHOWS THERMOSTAT IS PROCESSING
INFORMATION AND WAITING TO CALL FOR HEAT OR COOL

Hold for

Em Ht
Aux Ht

Mon

TueWedThuFriSatSun Days

WakeLeaveReturnSleep

System

Off Auto

Em

Heat

Cool

Set Day/Time

AM

Recovery

In

Wait

Temporary Setting

Humid

Outdoor

Filter

Repl Batt

Fan

On Auto

SHOWS SMART RESPONSE IS CHANGING
THE TEMPERATURE TO MEET THE
CURRENT PROGRAMS

Room

SHOWS SMART RESPONSE IS OFF.
CONVENTIONAL RECOVERY IS ON

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 CURRENT FAN
KEY POSITION ON/AUTO

SHOWS THERMOSTAT IS
CALLING FOR THE FAN

69-1284—24

M18594

STEP 1. PREPARE FOR INSTALLATION

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❑ Check Table 1, the compatibilit

is not compatible, call Hone

chart, to make sure the thermostat is compatible with your system. If your system

well Customer Relations Center, toll-free, 1-800-468-1502.

Table 1. Compatibility Chart.

System Type Compatibility with CT3550

Gas — Standin
Gas — Electronic I
Gas-fired Boilers

Pilot Yes

nition Yes

Yes

a

Gas — 750 Millivolt Heat Yes
Oil-Fired Boilers

Yes

a

Oil-Fired Furnace Yes
Electric Furnace Yes
Electric Air Conditionin

Baseboard Electric (120/240 line volt)

le Stage Heat Pump Yes

Sin

Multista

a

b

e Heat Pumps/Multistage Equipment No

Compatible with 2-wire Honeywell and Taco zone valves. Not compatible with 3-wire zone valves or 2-wire White

ers no. 1361 zone valves.

Rod
Not compatible with any 120/240 volt system.

b

Yes
No

Package Contents.

• Thermostat • Wallplate

• Screws and anchors • Wirin

• 3 Ener

izer® AA batteries • Owners manual

labels

Tools Required

• Screwdriver

• Drill
5 69-1284—2

STEP 2. REMOVE OLD THERMOSTAT

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WIRES THROUGH
WALL OPENING

M5136

❑ Test

❑ Turn off power to the s
❑ Carefull
❑ Remove the cover from the old thermostat. If the cover does not snap off when pulled firml

❑ Loosen the screw or screws holdin
❑ Disconnect the wires from the old thermostat. As

our heating and cooling systems to make sure they work properly. If either system does not work, contact

our local heating/air-conditioning dealer. To avoid compressor damage, do not operate the cooling system when

outdoor temperature is below 50°F (10°C).

unpack your new thermostat and wallplate. Save package of screws, instructions, and receipt.

for a screw or screws used to lock on the cover.

terminal desi
shown to keep them from fallin

nation. If there are only two wires, they do not need to be labeled. Wrap the wires around a pencil as

stem at the furnace or the fuse/circuit breaker panel.

from the bottom, check

the thermostat to the wallplate and lift the thermostat away.

ou disconnect each wire, attach the enclosed labels with the old

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 heatin

Replacing a Clock Thermostat that has C or C1 Clock Terminals

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 wirin
Disconnect the wires and wrap them separatel
where the
labels of the remainin

will not interfere with the operation of the new thermostat. Record the colors and terminal designation

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
multista
the product to the place of purchase. For information about which pro
s

e heat pump or other multistage system. This thermostat is not compatible with multistage systems, so return

stem, call Honeywell Customer Relations Center, at 1-800-468-1502.

only system with three wires.

wallplate. Do not allow them to touch, or you can damage the transformer.

using electrical tape. Do not wrap them together. Place the wires

wires.

rammable thermostats will work with your

69-1284—26

Replacing a Thermostat that has Three Wires

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M16427

If you have three wires for a heating only system and can operate the fan using the fan ON switch this thermostat
works with
work onl
contractor.

our system. However, some hot water (zoned) heating systems also have three wires. Your thermostat will

if you install an isolating relay on these systems. For details, call your local heating and/or cooling

STEP 3. MOUNT THERMOSTAT WALLPLATE

❑ Separate the wallplate from the thermostat b

the bottom of the wallplate and the thermostat, and pullin
from the thermostat. See illustration at ri

placing your thumb or fingers between

the wallplate up and away

ht.

❑ Position the wallplate on the wall. Level the wallplate for appearance if desired. Use a

pencil to mark the two mountin

❑ Remove the wallplate from the wall. Drill two 3/16 in. holes in wall (if dr

For materials such as plaster or wood, drill 7/32 in. holes where marked. Gentl
(provided) anchors into the drilled holes until the

❑ Reposition the wallplate over the holes. Pull the wires throu

insert mounting screws into each of the holes.

Loosel

holes that best fit the application.

wall) as shown.

, tap the

are flush with the wall.

h the wiring opening.

❑ Level the wallplate if desired. Thermostat functions

properl

❑ Ti

when not level.

hten mounting screws.

WALL
ANCHORS (2)

WIRES
THROUGH WALL

7 69-1284—2

WALL

MOUNTING
HOLES

MOUNTING
SCREWS

M15044

STEP 4. WIRE WALLPLATE TERMINALS

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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

terminal letter on

❑ Remove the factor

our old thermostat wire with the corresponding

our new thermostat. Refer to Table 2.

-installed jumper connecting terminals R and

RC if wires are connected to both of those terminals.

❑ For wirin
❑ Loosen the terminal screws. Slip each wire beneath its matchin

terminal. Wraparound and strai
acceptable, (see illustration). Ti

❑ Plu

diagrams, if needed, see pp 21-22.

ht connections are both

hten the terminals.

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

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

M4826

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

R

W

Y

G

M16425

69-1284—28

Table 2. Terminal Designations on Old and New Thermostats

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Terminal on Old Thermostat Connect To Description

R, RH
Rc, R

a

, 4, V

a

R Power
Rc Power for coolin

W, W1, H W Heat

, M Y Coolin

Y, Y

1

G, F G Fan
O O Chan

b

B

c

C
W
Y

a
b
c

b

, Xc, B

, H

2

2

2

If both RH and R terminals are present on existing thermostat, remove jumper and connect Rh to R and R to Rc.
Do not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B.
Tape off end of the wire with electrical tape and push the taped wire back into the wiring hole in the wall.

b

B
Do not connect. Transformer common

Do not continue installation.
Call 1-800-468-1502.

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

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

Second stage heat.
Second stage cool.

STEP 5. INSTALL THE BATTERIES

IMPORTANT

❑ Install the batteries in the wallplate so the positive terminals all point

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.

up (see illustration).

9 69-1284—2

WALLPLATE

B

RRCOWYG

INSTALL 3 AA ALKALINE BATTERIES
AS SHOWN, POSITIVE (+) TERMINALS
TOWARD TOP.

M10622

❑ If the thermostat is alread

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placing your thumb between the thermostat and wallplate and

b

the thermostat up and away as shown.

pullin

mounted on the wall, remove the thermostat

When the batteries are runnin
to two months before the batteries run out completel
batteries as soon as possible once the messa

low, a REPL BAT message flashes for one

. Replace the

e 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 s
blank, the batteries are dead or installed incorrectl

stem retains the current time and day. If the display is

. You must reset the time and day. Refer to Set the Clock for

instructions.

60

60

90

70

80

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

the s
batteries do not last as lon

well recommends Energizer® batteries.

Hone

As a precaution when leavin

8

0

70

90

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

. They also can leak, causing damage to the thermostat and the wall surface.

STEP 6. MOUNT THE THERMOSTAT

A. ENGAGE TABS AT TOP

OF THERMOSTAT
AND WALLPLATE.

B.

PRESS LOWER
EDGE OF CASE
TO LATCH.

M16424

69-1284—210

M12703

STEP 7. CUSTOMIZE YOUR THERMOSTAT

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M13347

FEATURE
NUMBER

OPTION

M13348

Your Honeywell CT3550 thermostat comes preset to the most commonly used settings. The settings are:

— Gas or oil forced air furnace.
— Smart Response technolo
— Temperature °F.
— 12-hour clock format.

on.

You can chan

e 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 , simultaneousl

You now can chan

e any of these settings.

until the screen shows.

Fan Operation (Feature Number 2)

Fan operation options are:

— 0 = Gas or oil furnace. Furnace controls fan operation durin
— 1 = Electric furnace or sin

To chan

e fan operation:

le stage heat pump. Thermostat controls fan operation during heating.

❑ Press once.

Run

❑ Press Time to move to next feature or to return to main displa

Program

heating (preset).

System Type (Feature Number 4)

System type options are:

— 1 = Gravit
— 3 = Hot water, hi
— 6 = Gas or oil forced air furnace (preset).
— 9 = Electric furnace.

or steam system.

h efficiency furnace (90% or better), or single stage heat pump.

11 69-1284—2

.

To chan

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M13343

M13344

M13345

❑ Press until displa

❑ Press Time to move to next feature or to return to main displa

our system type:

shows your furnace or boiler type.

Run

Program

Smart Response™ Technology (Feature Number 13)

Smart Response technology options are:

— 0 = Smart Response technolo
— 1 = Smart Response technolo

on (preset).
off.

.

To turn Smart Response technolo

on or off:

❑ Press once.

Run

❑ Press Time to move to next feature or to return to main displa

NOTE: See Smart Response technolo

Program

.

(page 20) for information about this feature.

Temperature Format (Feature Number 14)

Temperature format options are:

— 0 = °F (preset).
— 1 = °C.

To chan

e temperature format:

❑ Press once.

Run

❑ Press Time to move to next feature or to return to main displa

Program

.

Time Format (Feature Number 16)

Time format options are:

— 0 = 12-hour clock (preset).
— 1 = 24-hour clock.

To chan

❑ Press once.

❑ Press to return to main displa

69-1284—212

e time format:

Run

Program

.

Factory Set Function (Feature Number 37)

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M13346

Do not change this setting.

STEP 8. SET THE CLOCK

Set Current Day and Time

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

❑ Press .

❑ Press until screen shows current da

❑ Press time or until screen shows current time. (Tappin

❑ Press .

Set Current

Day/Time

Day

increments).

Run

Program

.

Set Current

Day/Time

the will advance the time in one hour

STEP 9. PROGRAMMING

The keyboard is located behind the thermostat cover. The three most frequently used keys are near the display.

Pressin

displays the current temperature settings. Pressing the and keys change the temperature. The

thermostat displa

There is an individual ke

—The pro

Wake

et ready for work or school. (This is a higher temperature during the heating season and a lower

temperature durin

—The pro

Leave

(This is a lower temperature durin
season).

—The pro

Return

(This is a hi
season).

—The pro

Sleep

temperature durin

s day, time, program period, temperature, system and fan settings.

for each of the four program periods:

ram period when you want the house at a comfortable temperature when you get up and while you

the cooling season).

ram period you can set for an energy-saving temperature while you are away at work or school.

the heating season and a higher temperature during the cooling

ram period when you want the house at a comfortable temperature for activities before bedtime.

her temperature during the heating season and a lower temperature during the cooling

ram period you can set for an energy-saving temperature while you sleeping. (This is a lower

the heating season and a higher temperature during the cooling season).

13 69-1284—2

Table 3 can be helpful when plannin

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our schedule of time and temperature settings. The thermostat default settings

are shown in parentheses ( ).

Table 3. Personal Programming Table.

Period Default Setting Weekday (Mon-Fri) Saturday (Sat) Sunday (Sun)

Wake

Leave

Return

Sleep

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).

Time (6:00AM)

a

Heat

(70°F/21°C)

b

(78°F/25.5°C)

Cool
Time (8:00AM)

a

(62°F/16.5°C)

Heat

b

Cool

(85°F/29.5°C)

Time (6:00PM)

a

(70°F/21°C)

Heat

b

(78°F/25.5°C)

Cool
Time (10:00PM)

a

Heat

(62°F/16.5°C)

b

(82°F/28°C)

Cool

Program Weekdays

Start by programming the wake time and temperature for weekdays.

❑ Press and release .

❑ Press until the (Mon-Fri) displa

Day

❑ Press Time or ke

Wake

s.

until the desired time shows in the display.

NOTE: Pro

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

69-1284—214

❑ Press or until the desired wake temperature displa

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s.

The setpoint temperature ran

Heat/Cool

❑ Press to switch between setpoints.

NOTE: Pro

Settings

ram times are the same for heating and cooling.

❑ Press or until the displa
❑ Press until the fan is at the desired settin

NOTE: Settin

❑ Press , or and repeat these steps for each time period. Your weekda

Fan

Fan to On runs the system fan continuously in the program periods.

Leave Return Sleep

e 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.

shows the desired temperature setpoint.

(On or Auto).

Program Saturday and Sunday

❑ Repeat each step in Pro

Run

❑ Press when the entire week is pro

Program

ram Weekdays for Saturday and Sunday.

rammed.

Clear a Program Period

NOTE: Wake cannot be cleared.

Leave

Sleep

ram period you want to clear.

displays (Mon-Fri Sat; Sun).

Return Sleep

3 seconds until the time and temperature clear.

❑ Press , , or for the pro

❑ Press until the desired da

Leave Return

Day

❑ Press and hold the , , or for approximatel

❑ Repeat the above steps for each period to be cleared.

Run

❑ Press .

Program

is now programmed.

15 69-1284—2

STEP 10. OPERATING YOUR THERMOSTAT

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Change Temperature Setting Until the Next Program Period (Temporary Change)

❑ Press or until the screen shows the desired temperature settin

.

NOTE: The temporar

ed. Temporary appears in the display. The setting cancels when the next program period starts or when

pla

ou press .

temperature setting is displayed for about 3 seconds and then the room temperature is dis-

Run

Program

Change Temperature Setting Indefinitely (Hold)

❑ Press until “Heat” or “Cool” is displa
❑ Press then or to chan

❑ To cancel “Hold” press .

System

Hold Temp

ed.

our setting if desired. (The display changes from showing the setpoint

temperature to room temperature after approximatel

Run

Program

three seconds).

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

❑ Press twice.
❑ Press or until the displa

❑ Press time until the desired number of da

❑ Press , , or to select the pro

NOTE: If the Vacation Hold needs to be cancelled before the desi

Hold Temp

shows the desired temperature setpoint.

Wake Leave Return Sleep

s that you will be away (1 through 255) is displayed.

ram period when you want the program to restart.

Run

nated time, press to return to the program.

Program

69-1284—216

STEP 11. SET THE FAN AND SYSTEM KEY

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Set the Fan Key

Fan On: The fan runs continuously. Use for improved air circulation or more efficient central air cleaning. (In a heat

Press until displa
Fan Auto: Normal settin

Press until displa

stem, the fan runs continuously only if the fan relay is connected to the G thermostat terminal).

onl

Fan

shows On.

for most homes. The equipment controls the fan operation.

Fan

shows Auto.

NOTE: If

ou set the fan to On during normal operation, the fan reverts to the programmed fan setting when the

next pro

ram period begins.

Set the System Key

Heat: The thermostat controls your heating system.

System

Press until displa

Off: Both the heatin

System

Press until the displa

Cool: The thermostat controls

System

Press until the displa

shows Heat.

and air conditioning systems are off.

shows Off.

our air conditioning system.

shows Cool.

17 69-1284—2

If You Have a Problem

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Table 4. Solution Guide.

If... Then…

Displa

does not appear.

Temperature settin
(example; cannot set the heatin

her or the cooling lower).

hi

does not come on.

Heatin

Coolin

does not come on.

stem on indicator ( = heat, =

S
cool) is lit, but no warm or cool air is

from the registers.

comin

flashes during programming. The temperature setting limit has been reached. The heating setting range is

Displa

s will not change

•

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 heatin
45 to 99°F (7 to 37°C) for coolin

•

Make sure the heating setpoint is above the room temperature.

•

Make sure the circuit breaker is not tripped, and reset it if necessar

•

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 s

•

Set the s

•

Make sure the cooling setpoint is below the room temperature.

•

Make sure the circuit breaker is not tripped, and reset it if necessar

•

Make sure the s
and set it to On if it is in the Off position.

•

Wait five minutes for the s

•

Set the s

Wait five minutes after seein

ain. If no there is no hot or cool air coming from the registers, refer to

a
Heatin
checked, contact

40°F to 90°F (4.5°C to 32°C). The coolin
to 37°C).

stem key to Heat.

stem switch at the air conditioner is in the On position,

stem key to Cool.

the flame or snowflake and check the registers

does not come on or Cooling does not come on. If all of this has been

our local heating and cooling contractor.

.

.

stem to respond.

stem to respond.

setting range is 45°F to 99°F (7°C

.

.

69-1284—218

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Table 4. Solution Guide.

If... Then…

1.

Temperature chan

times.

wron

e occurs at the

Check the pro

2.

Make sure the AM and PM settin

3.

Make sure the current time and da

4.

Repro

NOTE: If

our thermostat is set for Smart Response control, the start times

occur before

ram times for the period in question.

ram any incorrect settings.

our programmed comfort periods.

s are correct.

settings are correct.

Toll-Free Customer Assistance

Please read and follow the provided instructions for this thermostat. For additional information, go to
www.hone
hours are Monda

well.com/yourhome or call the Honeywell Customer Relations Center at 1-800-468-1502. The Center

through Friday, 7:00AM to 5:30PM Central Time.

Before callin

• Thermostat model number. (Located on back of thermostat).

• Thermostat date code. (Located below model number).

• T

• Location and number of wires connected to the thermostat.

, please have the following information available:

pe of heating/cooling system (for example, hot water, warm air, oil, or gas).

19 69-1284—2

SMART RESPONSE™ TECHNOLOGY

y

y

gy

y

y

y

y

y

gly

y

y

y

y

gy by

y

TEMPERATURE

Your CT3550 is actually a small computer. The Smart Response technology calculates the correct time of day to turn

our heating or cooling system. Smart Response technology considers the following information.

on

• Air temperature.

• Wall temperature.

• The time of da

When the thermostat activates Smart
Response technolo

s In Recovery, changes the setpoint,

displa
and turns on the s

• Your CT3550 thermostat learns from
experience. Each da

it hit the recovery target and

closel
then adjusts the next da
start time accordin

• It takes a few da
the thermostat to adjust to the local
weather,

our home, and your heating/cooling

of

stem.

s

• You can turn off Smart Response
technolo
Recover
Thermostat.

when you want the comfort temperature established.

, the thermostat

68°F

stem.

it checks how

66°F

s recovery

.

s after installation for

our lifestyle, the construction

selecting Conventional

. See Step 7. Customize Your

64°F

62°F

System Operating in
Energy Savings Mode

Mon

System

ENERGY
SAVINGS
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.

System Operating
in Comfort Mode

AM

Mon
Wake

Recovery
Continues

AM

Mon

Recovery

Sleep

In

System

Recovery
Begins

Mon

System

Heat

AM

Room

Sleep

Heat

5:305:00 6:00 6:30

RECOVERY FROM ENERGY SAVINGS

Heat

TIME

1

Room

AM

Heat

Recovery

In

Sleep

System

Heat

Room

Heat

Room

COMFORT
PERIOD

M18591

69-1284—220

WIRING DIAGRAMS

2-WIRE HEAT-ONLY
(JUMPER INTACT)

THERMOSTAT

B

RC

OW Y

R

4-WIRE HEAT/COOL
(JUMPER INTACT)

THERMOSTAT

B

RC

OW Y

G

R

G

HEATING
RELAY OR
VALVE COIL

1 POWER SUPPLY.

PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

3-WIRE HEAT ONLY WITH FAN

(JUMPER INTACT)

THERMOSTAT

B

RC

OW Y

R

HEATING
RELAY OR
VALVE COIL

1 POWER SUPPLY. PROVIDE

DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.

G

FAN
RELAY

1

M10618

1

M10616

OW Y

3

COMPRESSOR
CONTACTOR

COOLING
CONTACTOR
COIL

G

FAN
RELAY

FAN
RELAY

HEAT
CHANGEOVER
VALVE

1

M10617

2

M12739

HEATING
RELAY OR
VALVE COIL

1 POWER SUPPLY. PROVIDE

DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.

4-WIRE SINGLE-STAGE HEAT PUMP

(JUMPER INTACT)

THERMOSTAT

B

RC

R

2

COOL

1

CHANGEOVER
VALVE

POWER SUPPLY. PROVIDE DISCONNECT MEANS

1

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.

21 69-1284—2

5-WIRE HEAT/COOL
(JUMPER REMOVED)

THERMOSTAT

B

RC

R

OW Y

5-WIRE HEAT/COOL WITH DAMPER

(JUMPER INTACT)

THERMOSTAT

B

RC

OW Y

G

R

G

HEATING
RELAY OR
VALVE COIL

1

1 POWER SUPPLY. PROVIDE

FAN

COOLING
CONTACTOR

RELAY

COIL

DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

M10619

HEAT
DAMPER

1

1

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

COOL
DAMPER

HEAT
RELAY

COMPRESSOR
CONTACTOR

FAN
RELAY

Notice:

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

69-1284—222

1

M18738

Limited One-Year Warranty

y

y

y

y

y

y

y

y

g

g

y

y g

y

g

y

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)
the warrant
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

This warrant
that the defect or malfunction was caused b
consumer.

Hone
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 dama

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 lon
not appl

period, the product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywells

malfunction, and mail it, postage prepaid, to the following address:

well Inc. USA Honeywell Canada:

Hone
Dock 4 — MN10-3860 Hone
1885 Douglas Drive North 35 Dynamic Drive
Golden Valle

wells sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL

to you.

, MN 55422-3992 Scarborough, Ontario M1V 4Z9

does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell

ear from the date of purchase by the consumer. If, at any time during

well Limited/Honeywell Limitée

damage which occurred while the product was in the possession of a

es, so this limitation may not apply to you.

an implied warranty lasts, so the above limitation may

This warrant

If

ou have any questions concerning this warranty, please write our Customer Relations Center, Honeywell Inc.,
1885 Dou
Central time. In Canada, write Retail Products ON30 Hone
North York, Ontario M2H 3N7.

ives you specific legal rights, and you may have other rights which vary from state to state.

las Dr. N., Golden Valley, MN 55422-3992, or call 1-800-468-1502, Monday-Friday, 7:00 a.m. to 5:30 p.m.,

well Limited/Honeywell Limitée, 155 Gordon Baker Road,

23 69-1284—2

Home and Building Control Home and Building Control

Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario

69-1284—2 J.H. Rev. 04-01 www.honeywell.com/yourhome

M1V 4Z9

Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.