Honeywell CT3550 User manual

Brand: Honeywell

Model: CT3550

Category: Thermostats

Type: User manual

Honeywell CT3550 is a programmable thermostat that offers total comfort temperature management with Smart Response™ Technology. It features customizable programming for weekdays, Saturdays, and Sundays, allowing you to set different heating and cooling schedules for each day. With its auto changeover function, it automatically switches between heating and cooling modes to maintain your desired temperature. The large digital display provides clear visibility, and the user-friendly interface makes it easy to adjust settings and monitor the current temperature.

Place Bar Code Here

69- 1284- 2

OWNER’S GUIDE

® U.S. Re

istered Trademark

Cop

well • •All Ri

hts Reserved

Honeywell CT3550

PROGRAMMABLE THERMOSTAT

Weekda

, Saturda

and Sunda

Pro

rammable Heat and/or Cool

Low Volta

(

20 to 30 Vac

)

Thermostat and Wallplate

Model CT3550

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

rammin

................................................................................................................................................ 13

Step 10. Operatin

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

Step 11. Set the Fan and S

stem Ke

...................................................................................................................... 17

Smart Response™ Technolo

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

Wirin

Dia

rams ........................................................................................................................................................ 21

69-1284—22

Total comfort temperature management with Smart Response™ Technology.

Con

ratulations! You made a smart choice b

purchasin

our new Hone

well thermostat the smart thermostat that;

• Keeps

ou comfortable b

automaticall

calculatin

exactl

when the furnace or air conditionin

should

o on to

have the house at the desired comfort temperature b

the time

ou wake up or return home.

• Saves the maximum amount of ener

and mone

automaticall

rememberin

to adjust the temperature when

ou leave home or

o to sleep.

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

rammed. You can use the prepro

rammed

schedule, or set

our own.

This manual answers man

of the questions that can arise as

ou become familiar and comfortable with

our

Hone

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

Read these instructions carefull

. Failure to follow these instructions can dama

e the product or cause a hazardous

condition.

MERCURY NOTICE

If this thermostat is replacin

a control that contains mercur

in a

sealed tube, do not place

our old control in the trash. Contact

our local waste mana

ement authorit

for instructions re

ardin

rec

clin

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

control containin

mercur

in a sealed tube.

ou have questions, call Hone

well Inc. at 1-800-468-1502.

M10614

MERCURY

SWITCH

TYPICAL LOCATION OF A MERCURY

SWITCH IN A THERMOSTAT

3 69-1284—2

Time Set Program

Run

Program

Hold Temp

Set Current

Day/Time

Day

Heat/Cool

Settings

Wake

Leave

Return Sleep

M18741

RAISES

TEMPERATURE SETTING

LOWERS

TEMPERATURE SETTING

DISPLAYS

CURRENT HEAT/COOL

TEMPERATURE SETTING

PROGRAM PERIODS

WAKE/LEAVE/RETURN/SLEEP:

ENTERS PROGRAMMING MODE

FAN KEY

SELECTS AUTO/ON

SYSTEM KEY

SELECTS HEAT/OFF/COOL

DIGITAL DISPLAY

SET CURRENT

DAY/TIME

SETS CURRENT

TIME AND DAY

RUN PROGRAM

RETURNS

THERMOSTAT

TO NORMAL

OPERATING MODE

HEAT/COOL SETTING

SWITCHES BETWEEN

HEAT SETPOINTS AND

COOL SETPOINTS

WHILE PROGRAMMING

TIME /TIME

SETS TIME FORWARD OR BACK

DAY

SETS DAY OF

THE WEEK

HOLD TEMP

SETS A HOLD

TEMPERATURE

SETTING AND

ACTIVATES

VACATION HOLD

FEATURE

System

Fan

69-1284—24

M18594

Aux Ht

System

Off Auto

WakeLeaveReturnSleep

Mon

Wait

Fan

On Auto

Room

Humid

Outdoor

Filter

Hold for

Repl Batt

Recovery

Cool

TueWedThuFriSatSun Days

Set Program

Set Day/Time

Temporary Setting

Heat

Em Ht

DISPLAYS EITHER CURRENT

TIME OF DAY OR PROGRAM TIMES

SHOWS THERMOSTAT IS IN

THE SET DAY/TIME MODE

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 CURRENT FAN

KEY POSITION ON/AUTO

SHOWS THERMOSTAT IS

CALLING FOR THE FAN

SHOWS SMART RESPONSE IS OFF.

CONVENTIONAL RECOVERY IS ON

SHOWS THERMOSTAT IS PROCESSING

INFORMATION AND WAITING TO CALL FOR HEAT OR COOL

SHOWS SMART RESPONSE IS CHANGING

THE TEMPERATURE TO MEET THE

CURRENT PROGRAMS

SHOWS THAT THERMOSTAT IS

"CALLING" FOR HEAT OR COOL

SHOWS CURRENT

SYSTEM KEY 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

5 69-1284—2

STEP 1. PREPARE FOR INSTALLATION

❑ Check Table 1, the compatibilit

chart, to make sure the thermostat is compatible with

our s

stem. If

our s

stem

is not compatible, call Hone

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

Table 1. Compatibility Chart.

Compatible with 2-wire Hone

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

Rod

ers no. 1361 zone valves.

Not compatible with an

120/240 volt s

stem.

Package Contents.

• Thermostat • Wallplate

• Screws and anchors • Wirin

labels

• 3 Ener

izer® AA batteries • Owners manual

Tools Required

• Screwdriver

• Drill

System Type Compatibility with CT3550

Gas — Standin

Pilot Yes

Gas — Electronic I

nition Yes

Gas-fired Boilers

Yes

Gas — 750 Millivolt Heat Yes

Oil-Fired Boilers

Yes

Oil-Fired Furnace Yes

Electric Furnace Yes

Electric Air Conditionin

Yes

Baseboard Electric (120/240 line volt)

Sin

le Sta

e Heat Pump Yes

Multista

e Heat Pumps/Multista

e Equipment No

69-1284—26

STEP 2. REMOVE OLD THERMOSTAT

❑ Test

our heatin

and coolin

stems to make sure the

work properl

. If either s

stem does not work, contact

our local heatin

/air-conditionin

dealer. To avoid compressor dama

e, do not operate the coolin

stem when

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

❑ Turn off power to the s

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

❑ Carefull

unpack

our new thermostat and wallplate. Save packa

e of screws, instructions, and receipt.

❑ Remove the cover from the old thermostat. If the cover does not snap off when pulled firml

from the bottom, check

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

❑ Loosen the screw or screws holdin

the thermostat to the wallplate and lift the thermostat awa

❑ Disconnect the wires from the old thermostat. As

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

terminal desi

nation. If there are onl

two wires, the

do not need to be labeled. Wrap the wires around a pencil as

shown to keep them from fallin

back into the wall.

Special Installations

Read this section if

ou are replacin

• Clock thermostat with separate wires for the clock.

• Thermostat with six or more wires connected to it.

• Thermostat in a heatin

onl

stem with three wires.

Replacing a Clock Thermostat that has C or C1 Clock Terminals

ou are replacin

a Hone

well Chronotherm® Thermostat,

ou ma

find one or two wires

oin

to the C or C1 clock

terminals on the Chronotherm wirin

wallplate. Do not allow them to touch, or

ou can dama

e the transformer.

Disconnect the wires and wrap them separatel

usin

electrical tape. Do not wrap them to

ether. Place the wires

where the

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

nation

labels of the remainin

wires.

Replacing a Thermostat that has Six or More Wires

If there are six or more wires (excludin

clock wires attached to terminals),

ou probabl

have a variation of a

multista

e heat pump or other multista

e s

stem. This thermostat is not compatible with multista

e s

stems, so return

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

rammable thermostats will work with

our

stem, call Hone

well Customer Relations Center, at 1-800-468-1502.

WIRES THROUGH

WALL OPENING

M5136

7 69-1284—2

Replacing a Thermostat that has Three Wires

ou have three wires for a heatin

onl

stem and can operate the fan usin

the fan ON switch this thermostat

works with

our s

stem. However, some hot water (zoned) heatin

stems also have three wires. Your thermostat will

work onl

ou install an isolatin

rela

on these s

stems. For details, call

our local heatin

and/or coolin

contractor.

STEP 3. MOUNT THERMOSTAT WALLPLATE

❑ Separate the wallplate from the thermostat b

placin

our thumb or fin

ers between

the bottom of the wallplate and the thermostat, and pullin

the wallplate up and awa

from the thermostat. See illustration at ri

ht.

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

pencil to mark the two mountin

holes that best fit the application.

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

wall) as shown.

For materials such as plaster or wood, drill 7/32 in. holes where marked. Gentl

, tap the

(provided) anchors into the drilled holes until the

are flush with the wall.

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

h the wirin

openin

Loosel

insert mountin

screws into each of the holes.

❑ Level the wallplate if desired. Thermostat functions

properl

when not level.

❑ Ti

hten mountin

screws.

M16427

WIRES

THROUGH WALL

WALL

MOUNTING

HOLES

M15044

MOUNTING

SCREWS

WALL

ANCHORS (2)

69-1284—28

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

ou placed on the wires when

ou removed the

old thermostat (see illustration).

❑ Match the letter of

our old thermostat wire with the correspondin

terminal letter on

our new thermostat. Refer to Table 2.

❑ Remove the factor

-installed jumper connectin

terminals R and

RC if wires are connected to both of those terminals.

❑ For wirin

dia

rams, if needed, see pp 21-22.

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

terminal. Wraparound and strai

ht connections are both

acceptable, (see illustration). Ti

hten the terminals.

❑ Plu

the hole in the wall with insulation to help prevent drafts from adversel

affectin

thermostat operation.

M16425

M4826

FOR WRAPAROUND

INSERTION STRIP

7/16 IN. (11 MM).

FOR STRAIGHT INSERTION

STRIP 5/16 IN. (8 MM).

9 69-1284—2

Table 2. Terminal Designations on Old and New Thermostats

If both RH and R terminals are present on existin

thermostat, remove jumper and connect Rh to R and R to Rc.

Do not connect both O and B when wirin

to a sin

le sta

e 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 wirin

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).

Terminal on Old Thermostat Connect To Description

R, RH

, 4, V

R Power

Rc, R

Rc Power for coolin

W, W

, H W Heat

Y, Y

, M Y Coolin

G, F G Fan

O O Chan

eover in cool. (Sin

le sta

e heat pump onl

Chan

eover in heat. (Sin

le sta

e heat pump onl

, X

, B

Do not connect. Transformer common

, H

Do not continue installation.

Call 1-800-468-1502.

Second sta

e heat.

Second sta

e cool.

M10622

INSTALL 3 AA ALKALINE BATTERIES

AS SHOWN, POSITIVE (+) TERMINALS

TOWARD TOP.

WALLPLATE

RRCOWYG

69-1284—210

❑ If the thermostat is alread

mounted on the wall, remove the thermostat

placin

our thumb between the thermostat and wallplate and

pullin

the thermostat up and awa

as shown.

When the batteries are runnin

low, a REPL BAT messa

e flashes for one

to two months before the batteries run out completel

. Replace the

batteries as soon as possible once the messa

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.

ou insert new batteries within 20 to 30 seconds of removin

the old

batteries, the s

stem retains the current time and da

. If the displa

blank, the batteries are dead or installed incorrectl

. You must reset the time and da

. Refer to Set the Clock for

instructions.

As a precaution when leavin

home for lon

er than a month, chan

e batteries before leavin

to prevent

the s

stem from shuttin

down due to lack of power. Alwa

s use fresh alkaline batteries. Nonalkaline

batteries do not last as lon

. The

also can leak, causin

dama

e to the thermostat and the wall surface.

Hone

well recommends Ener

izer® batteries.

STEP 6. MOUNT THE THERMOSTAT

M16424

M12703

PRESS LOWER

EDGE OF CASE

TO LATCH.

A. ENGAGE TABS AT TOP

OF THERMOSTAT

AND WALLPLATE.

11 69-1284—2

STEP 7. CUSTOMIZE YOUR THERMOSTAT

Your Hone

well CT3550 thermostat comes preset to the most commonl

used settin

s. The settin

s are:

— Gas or oil forced air furnace.

— Smart Response technolo

on.

— Temperature °F.

— 12-hour clock format.

You can chan

e an

or all of these settin

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

until the screen shows.

You now can chan

e an

of these settin

Fan Operation (Feature Number 2)

Fan operation options are:

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

heatin

(preset).

— 1 = Electric furnace or sin

le sta

e heat pump. Thermostat controls fan operation durin

heatin

To chan

e fan operation:

❑ Press once.

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

System Type (Feature Number 4)

stem t

pe options are:

— 1 = Gravit

or steam s

stem.

— 3 = Hot water, hi

h efficienc

furnace (90% or better), or sin

le sta

e heat pump.

— 6 = Gas or oil forced air furnace (preset).

— 9 = Electric furnace.

M13347

FEATURE

NUMBER

OPTION

Run

Program

M13348

69-1284—212

To chan

our s

stem t

pe:

❑ Press until displa

shows

our furnace or boiler t

pe.

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

Smart Response™ Technology (Feature Number 13)

Smart Response technolo

options are:

— 0 = Smart Response technolo

on (preset).

— 1 = Smart Response technolo

off.

To turn Smart Response technolo

on or off:

❑ Press once.

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

NOTE: See Smart Response technolo

(pa

e 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.

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

Time Format (Feature Number 16)

Time format options are:

— 0 = 12-hour clock (preset).

— 1 = 24-hour clock.

To chan

e time format:

❑ Press once.

❑ Press to return to main displa

Run

Program

M13343

Run

Program

M13344

Run

Program

M13345

Run

Program

13 69-1284—2

Factory Set Function (Feature Number 37)

Do not chan

e this settin

STEP 8. SET THE CLOCK

Set Current Day and Time

NOTE: On initial power-up, the screen flashes 1:00 pm until

ou press a ke

❑ Press .

❑ Press until screen shows current da

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

the will advance the time in one hour

increments).

❑ Press .

STEP 9. PROGRAMMING

The ke

board is located behind the thermostat cover. The three most frequentl

used ke

s are near the displa

Pressin

displa

s the current temperature settin

s. Pressin

the and ke

s chan

e the temperature. The

thermostat displa

s da

, time, pro

ram period, temperature, s

stem and fan settin

There is an individual ke

for each of the four pro

ram periods:

—The pro

ram period when

ou want the house at a comfortable temperature when

et up and while

et read

for work or school. (This is a hi

her temperature durin

the heatin

season and a lower

temperature durin

the coolin

season).

—The pro

ram period

ou can set for an ener

-savin

temperature while

ou are awa

at work or school.

(This is a lower temperature durin

the heatin

season and a hi

her temperature durin

the coolin

season).

—The pro

ram period when

ou want the house at a comfortable temperature for activities before bedtime.

(This is a hi

her temperature durin

the heatin

season and a lower temperature durin

the coolin

season).

—The pro

ram period

ou can set for an ener

-savin

temperature while

ou sleepin

. (This is a lower

temperature durin

the heatin

season and a hi

her temperature durin

the coolin

season).

M13346

Set Current

Day/Time

Day

Set Current

Day/Time

Run

Program

Wake

Leave

Return

Sleep

69-1284—214

Table 3 can be helpful when plannin

our schedule of time and temperature settin

s. The thermostat default settin

are shown in parentheses ( ).

Table 3. Personal Programming Table.

Your heatin

setpoints cannot be hi

her than 90°F (32°C) or lower than 40°F (4.5°C).

Your coolin

setpoints cannot be hi

her than 99°F (37°C) or lower than 45°F (7°C).

Program Weekdays

Start b

pro

rammin

the wake time and temperature for weekda

❑ Press and release .

❑ Press until the (Mon-Fri) displa

❑ Press Time or ke

until the desired time shows in the displa

NOTE: Pro

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

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

Wake

Time (6:00AM)

Heat

(70°F/21°C)

Cool

(78°F/25.5°C)

Leave

Time (8:00AM)

Heat

(62°F/16.5°C)

Cool

(85°F/29.5°C)

Return

Time (6:00PM)

Heat

(70°F/21°C)

Cool

(78°F/25.5°C)

Sleep

Time (10:00PM)

Heat

(62°F/16.5°C)

Cool

(82°F/28°C)

Wake

Day

15 69-1284—2

❑ Press or until the desired wake temperature displa

The setpoint temperature ran

e is 40°F to 90°F (4.5°C to 32°C) for heatin

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

❑ Press to switch between setpoints.

NOTE: Pro

ram times are the same for heatin

and coolin

❑ Press or until the displa

shows the desired temperature setpoint.

❑ Press until the fan is at the desired settin

(On or Auto).

NOTE: Settin

Fan to On runs the s

stem fan continuousl

in the pro

ram periods.

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

is now pro

rammed.

Program Saturday and Sunday

❑ Repeat each step in Pro

ram Weekda

s for Saturda

and Sunda

❑ Press when the entire week is pro

rammed.

Clear a Program Period

NOTE: Wake cannot be cleared.

❑ Press , , or for the pro

ram period

ou want to clear.

❑ Press until the desired da

displa

s (Mon-Fri Sat; Sun).

❑ Press and hold the , , or for approximatel

3 seconds until the time and temperature clear.

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

❑ Press .

Heat/Cool

Settings

Fan

Leave Return Sleep

Run

Program

Leave Return

Sleep

Day

Leave

Return Sleep

Run

Program

69-1284—216

STEP 10. OPERATING YOUR THERMOSTAT

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

❑ Press or until the screen shows the desired temperature settin

NOTE: The temporar

temperature settin

is displa

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

pla

ed. Temporar

appears in the displa

. The settin

cancels when the next pro

ram period starts or when

ou press .

Change Temperature Setting Indefinitely (Hold)

❑ Press until “Heat” or “Cool” is displa

ed.

❑ Press then or to chan

our settin

if desired. (The displa

chan

es from showin

the setpoint

temperature to room temperature after approximatel

three seconds).

❑ To cancel “Hold” press .

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

❑ Press twice.

❑ Press or until the displa

shows the desired temperature setpoint.

❑ Press time until the desired number of da

s that

ou will be awa

(1 throu

h 255) is displa

ed.

❑ Press , , or to select the pro

ram period when

ou want the pro

ram to restart.

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

nated time, press to return to the pro

ram.

Run

Program

System

Hold Temp

Run

Program

Hold Temp

Wake Leave Return Sleep

Run

Program

17 69-1284—2

STEP 11. SET THE FAN AND SYSTEM KEY

Set the Fan Key

Fan On: The fan runs continuousl

. Use for improved air circulation or more efficient central air cleanin

. (In a heat

onl

stem, the fan runs continuousl

onl

if the fan rela

is connected to the G thermostat terminal).

Press until displa

shows On.

Fan Auto: Normal settin

for most homes. The equipment controls the fan operation.

Press until displa

shows Auto.

NOTE: If

ou set the fan to On durin

normal operation, the fan reverts to the pro

rammed fan settin

when the

next pro

ram period be

ins.

Set the System Key

Heat: The thermostat controls

our heatin

stem.

Press until displa

shows Heat.

Off: Both the heatin

and air conditionin

stems are off.

Press until the displa

shows Off.

Cool: The thermostat controls

our air conditionin

stem.

Press until the displa

shows Cool.

Fan

System

69-1284—218

If You Have a Problem

Table 4. Solution Guide.

If... Then…

Displa

does not appear.

•

Make sure the batteries are installed correctl

•

Make sure the thermostat is mounted and latched on the wallplate.

Mount and latch the thermostat on the wallplate if it is not.

Temperature settin

s will not chan

(example; cannot set the heatin

her or the coolin

lower).

•

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

Heatin

does not come on.

•

Make sure the heatin

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

stem to respond.

•

Set the s

stem ke

to Heat.

Coolin

does not come on.

•

Make sure the coolin

setpoint is below the room temperature.

•

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

•

Make sure the s

stem 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 s

stem to respond.

•

Set the s

stem ke

to Cool.

stem on indicator ( = heat, =

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

comin

from the re

isters.

Wait five minutes after seein

the flame or snowflake and check the re

isters

ain. If no there is no hot or cool air comin

from the re

isters, refer to

Heatin

does not come on or Coolin

does not come on. If all of this has been

checked, contact

our local heatin

and coolin

contractor.

Displa

flashes durin

pro

rammin

. The temperature settin

limit has been reached. The heatin

settin

ran

e is

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

settin

ran

e is 45°F to 99°F (7°C

to 37°C).

19 69-1284—2

Toll-Free Customer Assistance

Please read and follow the provided instructions for this thermostat. For additional information,

o to

www.hone

well.com/

ourhome or call the Hone

well Customer Relations Center at 1-800-468-1502. The Center

hours are Monda

throu

h Frida

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

Before callin

, please have the followin

information available:

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

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

• T

pe of heatin

/coolin

stem (for example, hot water, warm air, oil, or

as).

• Location and number of wires connected to the thermostat.

Temperature chan

e occurs at the

wron

times.

Check the pro

ram times for the period in question.

Make sure the AM and PM settin

s are correct.

Make sure the current time and da

settin

s are correct.

Repro

ram an

incorrect settin

NOTE: If

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

occur before

our pro

rammed comfort periods.

Table 4. Solution Guide.

If... Then…

69-1284—220

SMART RESPONSE™ TECHNOLOGY

Your CT3550 is actuall

a small computer. The Smart Response technolo

calculates the correct time of da

to turn

our heatin

or coolin

stem. Smart Response technolo

considers the followin

information.

• Air temperature.

• Wall temperature.

• The time of da

when

ou want the comfort temperature established.

When the thermostat activates Smart

Response technolo

, the thermostat

displa

s In Recover

, chan

es the setpoint,

and turns on the s

stem.

• Your CT3550 thermostat learns from

experience. Each da

it checks how

closel

it hit the recover

tar

et and

then adjusts the next da

s recover

start time accordin

• It takes a few da

s after installation for

the thermostat to adjust to the local

weather,

our lifest

le, the construction

our home, and

our heatin

/coolin

stem.

• You can turn off Smart Response

technolo

selectin

Conventional

Recover

. See Step 7. Customize Your

Thermostat.

System Operating in

Energy Savings Mode

Recovery

Begins

Recovery

Continues

System Operating

in Comfort Mode

ENERGY

SAVINGS

PERIOD

RECOVERY FROM ENERGY SAVINGS

5:305:00 6:00 6:30

COMFORT

PERIOD

TIME

THERMOSTAT USES THE SAME SCHEME TO RETURN TO LOWER COMFORT TEMPERATURE DURING

THE COOLING SEASON.

M18591

62°F

64°F

66°F

68°F

Heat

System

Mon

Room

Recovery

Sleep

Heat

System

Wake

Mon

Room

Heat

System

Mon

Room

Recovery

Sleep

Heat

System

Mon

Room

Sleep

Heat

IF In Recovery IS DISPLAYED, PRESS TO SEE THE COMFORT SETPOINT.

TEMPERATURE

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Honeywell CT3550 User manual

Brand: Honeywell

Model: CT3550

Category: Thermostats

Type: User manual

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Honeywell CT3550 User manual

Honeywell CT3550 User manual

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