Honeywell CT3451 Manual de usuario

® U.S. Registered Trademark

OWNER’S GUIDE

69-1620-1

CT3451

Programmable Thermostat

Programmable Heat and/or Cool

Low Voltage (20 to 30 Vac) Thermostat and Wallplate

Congratulations on the purchase of your new thermostat!

More than 100 years of Honeywell engineering produced

this thermostat that can provide you with a more

comfortable and convenient living environment.

Your new thermostat automatically controls the

temperature in your home, keeping you comfortable

while saving energy when programmed according to

these instructions.

Direct questions about this thermostat to our Web site at

www.honeywell.com/yourhome or call the customer

information line at 1-800-468-1502.

MERCURY NOTICE

If this control is replacing a control that contains

mercury in a sealed tube, do not place your old

control in the trash. Dispose of it properly.

Contact your local waste management authority

for instructions regarding recycling and the

proper disposal of an old control.

1 PREPARE FOR INSTALLATION

❑Check Table 1 to make sure this thermostat is

compatible with your system. If not, return it to the

retailer.

❑Acquire tools and items, as needed. See Fig. 1.

Fig. 1. Required installation tools/supplies.

M10614

MERCUR

SWITCH

YPICAL LOCATION OF A MERCURY

WITCH IN A THERMOSTAT

M20551

SCREWDRIVER HAND OR POWER

DRILL WITH 3/16 INCH

DRILL BIT, IF NEEDED TO

DRILL HOLES IN WALL

WIRE CUTTER/STRIPPER IF NEEDED TO STRIP WIRES

LEVEL, IF NEEDED TO LEVEL

THERMOSTAT FOR APPEARANCE

CT3451 PROGRAMMABLE THERMOSTAT

69-1620—1 2

2 REMOVE OLD THERMOSTAT

❑Test to be sure your heating and air conditioning

systems (where applicable) are working correctly. If

not, 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).

Not compatible with any 120/240 volt circuit.

aCompatible with 2-wire Honeywell zone valves. Isolating relay required for zone valves that have a 3-wire thermostat

connection.

CAUTION

Equipment Damage Hazard.

Handling wires during installation can

damage equipment.

Disconnect power at furnace or main breaker/

fuse box before beginning installation.

❑Carefully unpack your new thermostat and wallplate

and save package of screws, instructions and receipt.

❑Remove the cover from the old thermostat. If it does

not snap off when pulled firmly from the bottom, check

for screw that locks on the cover.

❑Loosen screws holding thermostat to subbase,

wallplate or wall and lift away.

❑Disconnect wires from old thermostat or subbase. As

you disconnect each wire, use the wiring labels

(enclosed) to label each wire with the old terminal

designation. If there are only two wires, they do not

require labeling. Wrap wires around a pencil to keep

them from falling back into the wall as shown in Fig. 2.

Fig. 2. Wrapping wires around pencil.

Replacing Clock WIth C or C1 Clock

Terminals

If you are replacing a Honeywell Chronotherm®

Thermostat, you may find one or two wires that go to the

C or C1 clock terminals on the Chronotherm®

Thermostat wiring wallplate. Do not allow them to touch,

or you can damage your transformer. Disconnect the

wires and wrap them separately using electrical tape; do

not wrap them together. Do not place the wires where

they can interfere with the new thermostat operation.

Record the colors and terminal designation labels of the

remaining wires.

Six or More Thermostat Wires

If there are six or more wires connected to the thermostat

(excluding clock wires attached to terminals), you

probably have a variation of a multistage heat pump or

other multistage system. The thermostat is not

compatible with these systems, so return the product to

your retailer. If you want information about which

programmable thermostats work with your system, visit

our Web site at www.honeywell.com/yourhome or call the

customer information line at 1-800-468-1502.

Three Thermostat Wires

If you have three wires for heating only and can operate

the fan using the Fan On switch, this thermostat works

with your system. However, some hot water (zoned)

heating systems have three thermostat wires. The

thermostat works only if a contractor installs an isolating

relay on these systems. For details, contact a local

heating/cooling contractor.

Table 1. Compatibility Chart.

System Type Compatible With CT3451

Gas—standing pilot Yes

Gas—electronic ignition Yes

Gas-fired boilers Yesa

Gas—750 millivolt Yes

Oil-fired boilers Yesa

Oil-fired furnace Yes

Electric furnace Yes

Electric air conditioning Yes

Single stage heat pumps (no backup or auxiliary heat) Yes

Baseboard electric (120/240 line volt) No

Multistage heat pumps/multistage equipment No

WIRES THROUG

WALL OPENING

M5136

CT3451 PROGRAMMABLE THERMOSTAT

3 69-1620—1

3 MOUNT WALLPLATE

IMPORTANT

Level for appearance only. The thermostat func-

tions normally even when not mounted level.

❑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. See

Fig. 3.

Fig. 3. Mounting wallplate to wall.

❑Remove the wallplate from the wall and drill two 3/16-

in. holes in the wall (if drywall). For firmer wall material

such as plaster or wood, drill 7/32-in. holes. Gently tap

provided anchors into the drilled holes until flush with

the wall.

❑Reposition the wallplate, pulling wires through the

wiring opening. Loosely insert the mounting screws

into the holes.

❑Level for appearance only; the thermostat functions

correctly even when not level. Tighten the mounting

screws.

4 WIRE WALLPLATE TERMINALS

All wiring must comply with local electrical codes and

ordinances. If unsure about household wiring

procedures, call your local heating and air conditioning

contractor.

Refer to the labels you placed on wires when you

removed your old thermostat.

❑Match the letter of your old thermostat wire with the

terminal of the corresponding letter on your new

thermostat. Refer to Fig. 4.

Fig. 4. Connecting wiring.

NOTE: To ensure correct mounting of thermostat,

restrict all wiring to the shaded area in the cen-

ter of the terminals.

❑Loosen the terminal screws and slip each wire

beneath its matching terminal. The shape of the

terminals permit insertion of straight or wraparound

connections. See Fig. 5. Tighten the terminals.

Fig. 5. CT3451 methods for wiring connection.

❑Plug the hole in the wall with insulation to help prevent

drafts from adversely affecting thermostat operation.

The CT3451 Thermostat is powered with 3AA alkaline

batteries and is adaptable to most 18 to 30 Vac heating-

cooling systems. Refer to Fig. 6 through 10 for typical

system wiring diagrams.

M12202A

WALL WALL

ANCHORS (2)

WALLPLATE

WHEN USING WALL ANCHORS, DRILL 3/16 INCH

HOLES FOR DRYWALL, 7/32 INCH HOLES FOR

PLASTER OR WOOD.

MOUNTING

SCREWS (2)

ERMINAL

CREW

M12559A

FOR STRAIGHT

INSERTION STRIP

5/16 IN. (8 MM)

FOR WRAPAROUND

STRIP 7/16 IN. (11 MM

)

M1253

FOR WRAPAROUND, STRIP

7/16 IN. (11 mm)

FOR STRAIGHT INSERTION

STRIP 5/16 IN. (8 mm)

CT3451 PROGRAMMABLE THERMOSTAT

69-1620—1 4

Fig. 6. Typical heat-cool system hookup with single

transformer.

Fig. 7. Typical heat system hookup with 2-wire, heat-

only system.

Fig. 8. Typical cool system hookup with 3-wire,

cool-only system.

Fig. 9. Typical heat-cool system hookup with two

transformers.

(HOT)

M20510

FAN

RELAY

THERMOSTAT

COMPRESSOR

CONTACTOR

TRANSFORMER

COOL

DAMPER

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT

PUMP SYSTEMS.

JUMPER R TO Rc.

HEAT

RELAY

HEAT

DAMPER

HEATING

RELAY AND

FAN COIL

24V

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

M20536

THERMOSTAT

(HOT)

FAN

COIL

COOLIING

CONTRACTOR

COIL

24V

POWER SUPPLY. PROVIDE DISCONNECT MEAN

AND OVERLOAD PROTECTION AS REQUIRED.

M2053

THERMOSTAT

M20511

(HOT

)

FAN

RELAY

HEAT

RELAY

(HOT)

COMPRESSOR

CONTACTOR

HEATING

TRANSFORMER

COOLING

TRANSFORMER

HEAT

DAMPER

COOL

DAMPER

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER

SYSTEM.

CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT

PUMP SYSTEMS.

THERMOSTAT

CT3451 PROGRAMMABLE THERMOSTAT

5 69-1620—1

Fig. 10. Typical single-stage heat pump system

hookup.

5 ADJUST FAN OPERATION

SWITCH

The thermostat fan operation switch, labeled fuel switch

in Fig. 11, is set at the factory in the F (gas/oil fuel)

position. This is the correct setting for most systems. If

you have an electric heat system, set the switch to the E

(electric) position. The E setting allows the fan to turn on

immediately with the heating equipment in a system

where the G terminal is connected.See Fig. 11.

Fig. 11. Fan operation (fuel) switch.

6 MOUNT THERMOSTAT TO

WALLPLATE

❑Slide System switch to the Off position.

❑Engage the tabs at the top of the thermostat and

wallplate.

❑Swing down the thermostat and press the lower edge

of the thermostat onto the wallplate to latch. See Fig.

12.

Fig. 12. Mounting thermostat to wallplate.

7 INSTALLING AND REPLACING

BATTERIES

The thermostat requires three AA alkaline batteries to

operate:

❑Remove the battery door, located on the right side of

the thermostat, by pulling outward from the bottom.

See Fig. 13.

❑Insert three AA alkaline batteries as shown in Fig. 13.

NOTE: The thermostat shows a “bAtLo” message on

the digital display to alert the homeowner one to

two months before the batteries run out com-

pletely.

IMPORTANT

Homeowner should replace the batteries once a

year to prevent leakage and/or the heating/cool-

ing system from shutting down due to lack of

battery power in the thermostat.

(HOT)

M20512

FAN

RELAY

T8002 THERMOSTAT

COMPRESSOR

CONTACTOR

TRANSFORMER

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

JUMPER Y TO W.

JUMPER R TO Rc.

USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.

HEAT

CHANGEOVER

VALVE

COOL

CHANGEOVER

VALVE

M20530

FAN OPERATION (FUEL) SWITCH

M20513

DASHED LINES INDICATETABS

ON BACK OFTHERMOSTAT

ENGAGETABS ATTOP OFTHERMOSTAT

WITH SLOTS ONWALLPLATE.

PRESS LOWER EDGE OF

CASETO LATCH.

SYSTEM

Cool Off Heat

Auto On

FAN

Hold

Select

SYSTEM

Cool Off Heat

Auto On

FAN

Hold

Select

TUE

CT3451 PROGRAMMABLE THERMOSTAT

69-1620—1 6

Fig. 13. Installing batteries.

❑Restore power to the heating/cooling system.

8 CUSTOMIZE YOUR THERMOSTAT

Your Honeywell thermostat comes preset to the most

commonly used settings:

— Temperature (°F).

— Gas or oil forced air furnace.

— Aggressive algorithm control.

You can change these settings using the instructions that

follow. To exit at any time, press the ▲ key until End

displays.

Setting °F/°C Indication, Heat Cycle Rate,

Heating/Cooling Temperature Control

The following instructions provide information to change

the heating cycle rate to match the heating equipment

and to choose either the Fahrenheit (°F) or Celsius (°C)

display.

NOTE: All four steps must be completed to save

changes to the °F/°C indication and the heat

cycle rate.

❑Enter Installer Setup.

— Use ▼ or ▲keys to set the temperature setpoint

to 52°F (11°C).

— Press ▼ and ▲keys simultaneously for more

than two seconds to enter Installer Setup.

— Release the keys to display the three-digit soft-

ware revision code. (Information displayed varies

by model).

— Press the ▲key. FC (factory configuration) dis-

plays. (A typical example is shown, but informa-

tion displayed varies by model. This information

is for factory use only.)

❑Setting °C or °F.

— Press the ▲key again to display the current

setting.

— Press the ▼key to change the °C or °F indication.

❑Setting Heat Cycle Rate (see Table 2 for the cycle rate

options and equipment).

— Press the ▲key to display the current heat cycle

rate setting of 1, 3, 4, 5, 9, or 12 cph.

— If the desired cycle rate is displayed, press the ▲

key to display heating and cooling algorithm

default.

— To change the heat cycle rate, press the ▼key

until your choice of 1, 3, 4, 5, 6, 9, or 12 is dis-

played.

— Press the ▲key to display the heating and

cooling temperature control algorithm configura-

tion default.

— Press the ▼key to change the heating and cool-

ing control algorithm to C1 or C3.

C1 = Standard control algorithm.

C3 = Aggressive control algorithm (Default. Can

cause overshooting.)

M20514

SYSTEM

Cool Off Heat

Auto On

FAN

Hold

Select

TUE

AA BATTERIES (3)

M12582

SET

HT.

M1258

M12584

M12589

M12588

M1469

CT3451 PROGRAMMABLE THERMOSTAT

7 69-1620—1

— Press the ▲key. Current configuration (CC) is

displayed. A typical example is shown, but CC

varies by model. (This information is for factory

use only.)

❑Exit Installer Setup.

— Press the ▲key to save all changes and return to

normal operation.

aHigh efficiency furnace (90+).

bRefer to the equipment manufacturer’s instructions.

9 PROGRAM YOUR THERMOSTAT

The thermostat is preprogrammed for your convenience

with the following time and temperature settings; see

Table 3. See energy saving charts at the end of this

document for energy-saving information.

Wake is the time period when you want the house at a

comfortable temperature when you get up in the morning.

NOTE: The heating and cooling program times are the

same. Changing your cooling Wake time also

changes your heating Wake time.

Leave is the time period you can set for an energy saving

temperature while you are away from home during the

day.

Return is the time period when you want the house at a

comfortable temperature when you come home during

the day.

Sleep is the time period when you can set an energy-

saving temperature while you are sleeping.

IMPORTANT

Always press the keys with your fingertip or sim-

ilar blunt tool. Sharp instruments like pens and

pencil points can damage the keyboard.

Setting Current Time and Day

1. To set current time, press Select twice. Press ▼

or ▲key to set current time.

NOTE: While setting the current time, the word SET is

displayed.

2. To set day of week, press Select again. Press▼

or ▲key to set current day.

To use the preprogrammed time and temperature

settings (see Table 3), press Hold to exit the

programming mode.

Setting Weekday Program

Slide the System switch to the position, Heat or Cool,

that you want to program. A flame (heating) or a

snowflake (cooling) appears in the right side of the

display, when setting the program temperature.

1. Wake

a. Press Select. Press ▼ or ▲key to set Wake

time.

b. Press Select. Press ▼ or ▲key to set Wake

temperature.

Table 2. Heating Cycle Rate.

System Cycle Per Hr

Steam, gravity 1

Hydronic heat, condensing gas

furnacesa

Gas or oil forced air (default) 6

Electric heat 9

Special applications 4, 5, 12

Table 3. Preprogrammed Time

and Temperature Settings.

Period Time

Heat

Setpoint

Cool

Setpoint

Wake 6:00 AM 70°F (21°C) 78°F (26°C)

Leave 8:00 AM 62°F (17°C) 85°F (29°C)

Return 6:00 PM 70°F (21°C) 78°F (26°C)

Sleep 10:00 PM 62°F (17°C) 82°F (28°C)

M1469

M12590A

M12591

SET

M1853

SET

M1857

SET

CT3451 PROGRAMMABLE THERMOSTAT

69-1620—1 8

2. Leave.

a. Press Select. Press ▼ or ▲key to set Leave

time.

b. Press Select. Press ▼ or ▲key to set Leave

temperature.

3. Return

a. Press Select. Press ▼ or ▲key to set Return

time.

b. Press Select. Press ▼ or ▲key to set Return

temperature.

4. Sleep

a. Press Select. Press ▼ or ▲key to set Sleep

time.

b. Press Select. Press ▼ or ▲key to set Sleep

temperature.

Setting Saturday and Sunday Programs

To set the Saturday program:

1. Wake

a. Press Select. Press ▼ or ▲key to set Wake

time.

b. Press Select. Press ▼ or ▲key to set Wake

temperature.

2. Leave

a. Press Select. Press ▼ or ▲key to set Leave

time.

b. Press Select. Press ▼ or ▲key to set Leave

temperature.

3. Return

a. Press Select. Press ▼ or ▲key to set Return

time.

b. Press Select. Press ▼ or ▲key to set Return

temperature.

M12625

SET

M1856

SET

M12627

SET

M1856

SET

M12629

SET

M1856

SET

M12631

SET

M2055

SET

M2055

SET

M2056

SET

M2056

SET

M2056

SET

M2056

SET

CT3451 PROGRAMMABLE THERMOSTAT

9 69-1620—1

4. Sleep

a. Press Select. Press ▼ or ▲key to set Sleep

time.

b. Press Select. Press ▼ or ▲key to set Sleep

temperature.

5. Repeat steps 1-4 in Setting Saturday and Sunday

Program section to set the Sunday program.

6. Press Select. End is displayed. Programming is

complete. The thermostat reverts to displaying the

current day time and temperature in five seconds.

7. Repeat programming steps to set heat or cool

program, as desired.

10 OPERATE YOUR THERMOSTAT

Displaying Temperature Setting

❑Press ▼ or ▲key once to display present

temperature setting. After approximately five seconds,

the thermostat displays the current time and room

temperature.

Setting Temporary Temperature Hold

❑Press ▼ or ▲key to set a temporary temperature

setting.

NOTE: The temporary temperature setting remains in

effect until the next program period. To cancel,

press Hold twice.

Setting Indefinite Temperature Hold

The Hold key allows you to indefinitely hold a

temperature. When Hold is active, the letters Hld are

displayed continuously. Hold can be canceled by

pressing the Hold key again.

❑Press Hold.

❑Press ▼ or ▲key to set indefinite temperature

setting.

11 SET FAN AND SYSTEM

SWITCHES

Manually control Fan and System settings using the

switches located at the bottom of the thermostat case.

See. Fig. 14 for switch locations.

Fig. 14. Time/temperature display and System/Fan

switches.

Fan Switch

❑The Fan switch settings are:

On: The fan runs continuously. Use for

improved air circulation.

Auto: Normal setting for most homes. In cooling,

the fan starts and stops with the cooling equip-

ment. In heating, the fan is controlled directly by

the heating equipment and starts a few minutes

after the heating equipment turns on (on most

systems). When the thermostat fuel switch is

set to the E position for electric heat, the fan

starts and stops with the heating equipment.

❑Slide the Fan switch on the thermostat to the desired

fan setting.

M2056

SET

M2056

SET

M1855

SET

M2053

TEMPORARSET Y

M12640

TEMPORARY

WED

M12641

M20515

SYSTEM

Cool Off Heat

Auto On

FAN

Hold

Select

TUE

CT3451 PROGRAMMABLE THERMOSTAT

69-1620—1 10

System Switch

❑The System switch settings control thermostat

operation as follows:

Cool: The thermostat controls the cooling

system.

Off: Both heating and cooling are off.

Heat: The thermostat controls the heating

system.

❑Slide the System switch on the thermostat to the

desired system setting.

Heat and Cool Indicators

indicates a call for heat.

indicates a call for cool.

NOTE: In the programming mode, the and

the indicate System setting.

Minimum Off-Timer

The thermostat minimum off-timer assures that the

compressor does not come on again for at least five

minutes after it turns off.

The minimum off-timer is triggered when the compressor

turns off and when the System switch position is

changed. If the compressor turns off when the setpoint is

changed, the minimum off-timer is triggered.

A flashing snowflake indicates the minimum off-timer

is in effect.

12 CHECK OPERATION AFTER

INSTALLATION/PROGRAMMING

Heating System

❑Slide the System switch to Heat and the Fan switch to

Auto.

❑Press and hold the ▲ key to raise the temperature

several degrees above the room temperature to start

the heating equipment. When using the thermostat

with the Fuel switch set to the E position for electric

heat, the fan starts immediately.

❑Press the ▼ key to lower the temperature setting

below the room temperature. The heating equipment

should shut down.

Cooling System

CAUTION

Compressor Damage Hazard.

Operating at too low of an outdoor

temperature can cause compressor damage.

Do not operate cooling if outdoor temperature is

below 50°F (10°C).

Allow compressor to remain off for five minutes

before restarting.

Refer to manufacturer’s recommendations.

1. Slide the System switch to Cool and the Fan switch

to Auto.

2. Press the ▼ key to lower the temperature setting

several degrees below the room temperature; the

cooling equipment should start. The fan starts and

stops with the cooling equipment.

NOTE: If the cooling system does not start immediately,

remember that the thermostat has a built-in min-

imum off-time of five minutes to protect the com-

pressor.

3. Press the ▲ key to raise the temperature setting

above the room temperature. Cooling system

should shut down.

Fan

❑Slide the System switch to Off and the Fan switch to

On. The fan should run continuously.

❑Slide the Fan switch to Auto. The fan should turn off.

Backlighting

❑Press any key to light the display for approximately

ten seconds.

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