Honeywell CT3451 Owner'S Manual Download Page 10 | Manualshive

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Honeywell CT3451 Owner'S Manual Download Page 10

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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Summary of Contents for CT3451

Page 1: ...ll 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 ...

Page 2: ...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 Th...

Page 3: ...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 matc...

Page 4: ...2 2 2 1 Y G Rc W 3 R B O HEAT RELAY HEAT DAMPER 3 1 1 HEATING RELAY AND FAN COIL 24V POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M20536 THERMOSTAT Y G Rc W R B O L1 HOT L2 1 FAN COIL COOLIING CONTRACTOR COIL 24V POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M20537 THERMOSTAT Y G Rc W R B O 1 Y G Rc W 2 R B O M20511 L1 HOT L2 FAN RELAY HEAT ...

Page 5: ...tteries 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 pr...

Page 6: ...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 ...

Page 7: ...ure 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 cur...

Page 8: ...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 temperat...

Page 9: ...ou 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 tempe...

Page 10: ...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 ...

Page 11: ...s blank or says bAtLo install fresh batteries The thermostat has a built in time delay on cooling Allow five to ten minutes after changing the setting before the air conditioner starts If the temperature setting is lower than the current room temperature and the snowflake is displaying the thermostat is operating correctly Contact an air conditioning contractor for assistance The furnace cycles to...

Page 12: ...ct was in the possession of a consumer Honeywell s sole responsibility shall be to repair or replace the product within the terms stated above HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING DIRECTLY OR INDIRECTLY FROM ANY BREACH OF ANY WARRANTY EXPRESS OR IMPLIED OR ANY OTHER FAILURE OF THIS PRODUCT Some states do not al...

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