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

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

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

Place Bar Code Here

69- 1284- 2

Total comfort temperature management with Smart Response™ Technology.

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

• Keeps

• 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

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

Heat

Cool

Set Day/Time

Recovery

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

❑ 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

Gas — 750 Millivolt Heat Yes Oil-Fired Boilers

Yes

Oil-Fired Furnace Yes Electric Furnace Yes Electric Air Conditionin

Baseboard Electric (120/240 line volt)

le Stage Heat Pump Yes

Sin

Multista

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.

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

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

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

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.

M16425

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+ 16 hidden pages