Owner's Manual
Page 1
... programmed according to these instructions. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this control is compatible with a more comfortable and convenient living environment. Programmable Heat and/or Cool Low Voltage (20 to the retailer. ❑ Acquire tools and items, as needed. Dispose of Honeywell engineering produced this thermostat that contains mercury in a sealed...
... programmed according to these instructions. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this control is compatible with a more comfortable and convenient living environment. Programmable Heat and/or Cool Low Voltage (20 to the retailer. ❑ Acquire tools and items, as needed. Dispose of Honeywell engineering produced this thermostat that contains mercury in a sealed...
Owner's Manual
Page 2
... the wires and wrap them together. CT3451 PROGRAMMABLE THERMOSTAT 2 REMOVE OLD THERMOSTAT ❑ Test to be sure your heating and air conditioning systems (where applicable) are replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires that have a 3-wire thermostat connection. If you want information about which programmable thermostats work with these systems. For details...
... the wires and wrap them together. CT3451 PROGRAMMABLE THERMOSTAT 2 REMOVE OLD THERMOSTAT ❑ Test to be sure your heating and air conditioning systems (where applicable) are replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires that have a 3-wire thermostat connection. If you want information about which programmable thermostats work with these systems. For details...
Owner's Manual
Page 3
...). Loosely insert the mounting screws into the drilled holes until flush with local electrical codes and ordinances. The CT3451 Thermostat is powered with 3AA alkaline batteries and is adaptable to most 18 to 30 Vac heatingcooling systems. Refer to...; Remove the wallplate from adversely affecting thermostat operation. M12202A Fig. 3. Mounting wallplate to Fig. 6 through the wiring opening. the thermostat functions correctly even when not level. Tighten the terminals. WALL 1 WALL ANCHORS (2) CT3451 PROGRAMMABLE THERMOSTAT TERMINAL SCREW FOR STRAIGHT INSERTION STRIP 5/...
...). Loosely insert the mounting screws into the drilled holes until flush with local electrical codes and ordinances. The CT3451 Thermostat is powered with 3AA alkaline batteries and is adaptable to most 18 to 30 Vac heatingcooling systems. Refer to...; Remove the wallplate from adversely affecting thermostat operation. M12202A Fig. 3. Mounting wallplate to Fig. 6 through the wiring opening. the thermostat functions correctly even when not level. Tighten the terminals. WALL 1 WALL ANCHORS (2) CT3451 PROGRAMMABLE THERMOSTAT TERMINAL SCREW FOR STRAIGHT INSERTION STRIP 5/...
Owner's Manual
Page 4
...CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 JUMPER R TO Rc. THERMOSTAT G Rc R W B Y O FAN COIL 1 L1 (HOT) L2 COOLIING CONTRACTOR COIL 24V 1 POWER SUPPLY. THERMOSTAT G Rc R 2 W B Y O 1 L1 (HOT) L2 FAN RELAY 3 COOL DAMPER ...3 HEAT DAMPER COMPRESSOR CONTACTOR HEAT RELAY 1 L1 (HOT) L2 COOLING HEATING TRANSFORMER TRANSFORMER 1 POWER SUPPLY. CT3451 PROGRAMMABLE THERMOSTAT THERMOSTAT G Rc R 3 1 L1 (HOT) L2 W Y HEAT RELAY FAN RELAY COMPRESSOR CONTACTOR B O 2 COOL DAMPER 2 HEAT DAMPER TRANSFORMER 1 ...
...CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 JUMPER R TO Rc. THERMOSTAT G Rc R W B Y O FAN COIL 1 L1 (HOT) L2 COOLIING CONTRACTOR COIL 24V 1 POWER SUPPLY. THERMOSTAT G Rc R 2 W B Y O 1 L1 (HOT) L2 FAN RELAY 3 COOL DAMPER ...3 HEAT DAMPER COMPRESSOR CONTACTOR HEAT RELAY 1 L1 (HOT) L2 COOLING HEATING TRANSFORMER TRANSFORMER 1 POWER SUPPLY. CT3451 PROGRAMMABLE THERMOSTAT THERMOSTAT G Rc R 3 1 L1 (HOT) L2 W Y HEAT RELAY FAN RELAY COMPRESSOR CONTACTOR B O 2 COOL DAMPER 2 HEAT DAMPER TRANSFORMER 1 ...
Owner's Manual
Page 5
... press the lower edge of battery power in the F (gas/oil fuel) position. Mounting thermostat to two months before the batteries run out completely. M20512 CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to lack of the thermostat onto the wallplate to prevent leakage and/or the heating/cooling system from the bottom. E F FAN OPERATION...
... press the lower edge of battery power in the F (gas/oil fuel) position. Mounting thermostat to two months before the batteries run out completely. M20512 CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to lack of the thermostat onto the wallplate to prevent leakage and/or the heating/cooling system from the bottom. E F FAN OPERATION...
Owner's Manual
Page 6
...to the most commonly used settings: - Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to display the three-digit software revision code. (Information displayed varies by model. Use ▼ or ▲ ... 52°F (11°C). M12589A - To change the heating cycle rate to match the heating equipment and to enter Installer Setup. CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat - M12584A ❑ Setting °C or °F. - You can change...
...to the most commonly used settings: - Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to display the three-digit software revision code. (Information displayed varies by model. Use ▼ or ▲ ... 52°F (11°C). M12589A - To change the heating cycle rate to match the heating equipment and to enter Installer Setup. CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat - M12584A ❑ Setting °C or °F. - You can change...
Owner's Manual
Page 7
...at the end of this document for an energy saving temperature while you want to the equipment manufacturer's instructions. 9 PROGRAM YOUR THERMOSTAT The thermostat is the time period when you can set Wake temperature. 7 69-1620-1 To set current time. Changing your cooling Wake... setting the program temperature. 1. Press the ▲ key to save all changes and return to set current time, press Select twice. CT3451 PROGRAMMABLE THERMOSTAT NOTE: The heating and cooling program times are sleeping. A flame (heating) or a snowflake (cooling) appears in the morning. Sleep is...
...at the end of this document for an energy saving temperature while you want to the equipment manufacturer's instructions. 9 PROGRAM YOUR THERMOSTAT The thermostat is the time period when you can set Wake temperature. 7 69-1620-1 To set current time. Changing your cooling Wake... setting the program temperature. 1. Press the ▲ key to save all changes and return to set current time, press Select twice. CT3451 PROGRAMMABLE THERMOSTAT NOTE: The heating and cooling program times are sleeping. A flame (heating) or a snowflake (cooling) appears in the morning. Sleep is...
Owner's Manual
Page 8
CT3451 PROGRAMMABLE THERMOSTAT SET M12625C 2. Leave. Press Select. Setting Saturday and Sunday Programs To set Leave temperature. Press ▼ or ▲ key to set Return temperature. Press ▼ ...
CT3451 PROGRAMMABLE THERMOSTAT SET M12625C 2. Leave. Press Select. Setting Saturday and Sunday Programs To set Leave temperature. Press ▼ or ▲ key to set Return temperature. Press ▼ ...
Owner's Manual
Page 9
...key to indefinitely hold a temperature. CT3451 PROGRAMMABLE THERMOSTAT Setting Indefinite Temperature Hold The Hold key allows you to set the Sunday program. 6. Repeat steps 1-4 in five seconds. End is active, the letters Hld are : On: The fan runs continuously. The thermostat reverts to displaying the current day time.... Hold can be canceled by the heating equipment and starts a few minutes after the heating equipment turns on (on the thermostat to the E position for improved air circulation. SET 11 SET FAN AND SYSTEM SWITCHES Manually control Fan and System settings using...
...key to indefinitely hold a temperature. CT3451 PROGRAMMABLE THERMOSTAT Setting Indefinite Temperature Hold The Hold key allows you to set the Sunday program. 6. Repeat steps 1-4 in five seconds. End is active, the letters Hld are : On: The fan runs continuously. The thermostat reverts to displaying the current day time.... Hold can be canceled by the heating equipment and starts a few minutes after the heating equipment turns on (on the thermostat to the E position for improved air circulation. SET 11 SET FAN AND SYSTEM SWITCHES Manually control Fan and System settings using...
Owner's Manual
Page 10
...°C). Fan ❑ Slide the System switch to Off and the Fan switch to manufacturer's recommendations. 1. Heat: The thermostat controls the heating system. ❑ Slide the System switch on again for five minutes before restarting. A flashing snowflake is in...Auto. 2. Do not operate cooling if outdoor temperature is changed , the minimum off . CT3451 PROGRAMMABLE THERMOSTAT System Switch ❑ The System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. If the compressor turns off . The fan should shut down ...
...°C). Fan ❑ Slide the System switch to Off and the Fan switch to manufacturer's recommendations. 1. Heat: The thermostat controls the heating system. ❑ Slide the System switch on again for five minutes before restarting. A flashing snowflake is in...Auto. 2. Do not operate cooling if outdoor temperature is changed , the minimum off . CT3451 PROGRAMMABLE THERMOSTAT System Switch ❑ The System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. If the compressor turns off . The fan should shut down ...
Owner's Manual
Page 11
... does not go lower than 40°F (4°C) or higher than the current room temperature and the flame is displaying, the thermostat is in question. Contact an air conditioning contractor for the furnace to heat up to come on . The batteries are correct. Temperature... If everything is coming from setback or setup, setting and displayed room temperatures can differ for heat at the wrong time. TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Frequently Asked Questions. Be sure that the System switch is set to 37°C). Then ... The furnace cycles too ...
... does not go lower than 40°F (4°C) or higher than the current room temperature and the flame is displaying, the thermostat is in question. Contact an air conditioning contractor for the furnace to heat up to come on . The batteries are correct. Temperature... If everything is coming from setback or setup, setting and displayed room temperatures can differ for heat at the wrong time. TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Frequently Asked Questions. Be sure that the System switch is set to 37°C). Then ... The furnace cycles too ...
Owner's Manual
Page 12
...which vary from state to state. In Canada, write Retail Products ON15, Honeywell Limited/Honeywell Limitée, 35 Dynamic Dr, Scarborough, Ontario M1V 4Z9. Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422...carefully, along with a bill of sale or other rights which occurred while the product was caused by the consumer. If you . CT3451 PROGRAMMABLE THERMOSTAT PERCENT OF HEATING COSTS YOU CAN SAVE SAVINGS FOR ONCE-A-DAY 10°F (5°C) DECREASE* 6 TO 8% 9 TO 11% 12...
...which vary from state to state. In Canada, write Retail Products ON15, Honeywell Limited/Honeywell Limitée, 35 Dynamic Dr, Scarborough, Ontario M1V 4Z9. Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422...carefully, along with a bill of sale or other rights which occurred while the product was caused by the consumer. If you . CT3451 PROGRAMMABLE THERMOSTAT PERCENT OF HEATING COSTS YOU CAN SAVE SAVINGS FOR ONCE-A-DAY 10°F (5°C) DECREASE* 6 TO 8% 9 TO 11% 12...