Owner's Manual
Page 1
..., return it properly. Contact your local waste management authority for instructions regarding recycling and the proper disposal of Honeywell engineering produced this thermostat that contains mercury in a sealed tube, do not place your old control in your home, keeping you ...comfortable while saving energy when programmed according to make sure this thermostat is replacing a control that can provide you with your system. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this control is compatible with a more comfortable and convenient ...
..., return it properly. Contact your local waste management authority for instructions regarding recycling and the proper disposal of Honeywell engineering produced this thermostat that contains mercury in a sealed tube, do not place your old control in your home, keeping you ...comfortable while saving energy when programmed according to make sure this thermostat is replacing a control that can provide you with your system. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this control is compatible with a more comfortable and convenient ...
Owner's Manual
Page 2
... heat) Baseboard electric (120/240 line volt) Multistage heat pumps/multistage equipment Compatible With CT3451 Yes Yes Yesa Yes Yesa Yes Yes Yes Yes No No Not compatible with your system. If there are replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires that go to the C or C1 clock...
... heat) Baseboard electric (120/240 line volt) Multistage heat pumps/multistage equipment Compatible With CT3451 Yes Yes Yesa Yes Yesa Yes Yes Yes Yes No No Not compatible with your system. If there are replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires that go to the C or C1 clock...
Owner's Manual
Page 3
...3/16in. FOR WRAPAROUND, STRIP 7/16 IN. (11 mm) FOR STRAIGHT INSERTION, STRIP 5/16 IN. (8 mm) M12537 Fig. 5. The CT3451 Thermostat is powered with 3AA alkaline batteries and is adaptable to most 18 to 30 Vac heatingcooling systems. Refer to Fig. 4. 3 MOUNT WALLPLATE IMPORTANT...local heating and air conditioning contractor. Use a pencil to the shaded area in the wall with local electrical codes and ordinances. WALL 1 WALL ANCHORS (2) CT3451 PROGRAMMABLE THERMOSTAT TERMINAL SCREW FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM) FOR WRAPAROUND STRIP 7/16 IN. (11 MM) G Rc R W B Y O ...
...3/16in. FOR WRAPAROUND, STRIP 7/16 IN. (11 mm) FOR STRAIGHT INSERTION, STRIP 5/16 IN. (8 mm) M12537 Fig. 5. The CT3451 Thermostat is powered with 3AA alkaline batteries and is adaptable to most 18 to 30 Vac heatingcooling systems. Refer to Fig. 4. 3 MOUNT WALLPLATE IMPORTANT...local heating and air conditioning contractor. Use a pencil to the shaded area in the wall with local electrical codes and ordinances. WALL 1 WALL ANCHORS (2) CT3451 PROGRAMMABLE THERMOSTAT TERMINAL SCREW FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM) FOR WRAPAROUND STRIP 7/16 IN. (11 MM) G Rc R W B Y O ...
Owner's Manual
Page 4
...heat-cool system hookup with 2-wire, heatonly system. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Typical heat system hookup with single transformer. THERMOSTAT G Rc R W B Y O FAN COIL 1 L1 (HOT) L2 COOLIING CONTRACTOR COIL 24V 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS ... MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 JUMPER R TO Rc. 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...
...heat-cool system hookup with 2-wire, heatonly system. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Typical heat system hookup with single transformer. THERMOSTAT G Rc R W B Y O FAN COIL 1 L1 (HOT) L2 COOLIING CONTRACTOR COIL 24V 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS ... MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 JUMPER R TO Rc. 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...
Owner's Manual
Page 5
... CHANGEOVER VALVE TRANSFORMER 1 POWER SUPPLY. See Fig. 12. Mounting thermostat to latch. M20513 Fig. 12. M20512 CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to operate: ❑ Remove the battery door, located on the right side of the thermostat, by pulling outward from shutting down the thermostat and press the lower edge of battery power in...
... CHANGEOVER VALVE TRANSFORMER 1 POWER SUPPLY. See Fig. 12. Mounting thermostat to latch. M20513 Fig. 12. M20512 CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to operate: ❑ Remove the battery door, located on the right side of the thermostat, by pulling outward from shutting down the thermostat and press the lower edge of battery power in...
Owner's Manual
Page 6
... change the heating and cooling control algorithm to enter Installer Setup. M12589A - SET HT. CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat - Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to display the current setting. - Aggressive algorithm control. Press the ▲...
... change the heating and cooling control algorithm to enter Installer Setup. M12589A - SET HT. CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat - Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to display the current setting. - Aggressive algorithm control. Press the ▲...
Owner's Manual
Page 7
PM M12590A Table 2. CT3451 PROGRAMMABLE THERMOSTAT NOTE: The heating and cooling program times are away from home during the day. Sleep is the time period when you can damage the keyboard. ... to set for factory use the preprogrammed time and temperature settings (see Table 3. see Table 3), press Hold to the equipment manufacturer's instructions. 9 PROGRAM YOUR THERMOSTAT The thermostat is displayed. SET PM M12591A 2. Setting Weekday Program Slide the System switch to the position, Heat or Cool, that you come home during the day...
PM M12590A Table 2. CT3451 PROGRAMMABLE THERMOSTAT NOTE: The heating and cooling program times are away from home during the day. Sleep is the time period when you can damage the keyboard. ... to set for factory use the preprogrammed time and temperature settings (see Table 3. see Table 3), press Hold to the equipment manufacturer's instructions. 9 PROGRAM YOUR THERMOSTAT The thermostat is displayed. SET PM M12591A 2. Setting Weekday Program Slide the System switch to the position, Heat or Cool, that you come home during the day...
Owner's Manual
Page 8
... set Leave time. Press ▼ or ▲ key to set Leave time. SET SET M18566 b. Press ▼ or ▲ key to set Leave temperature. Return a. CT3451 PROGRAMMABLE THERMOSTAT SET M12625C 2. M20558 b. Press Select. Press Select. Press Select. SET SET M18568 b. Press Select. SET SET M20563 M12631C 69-1620-1 8 Leave. Return a. Press ▼...
... set Leave time. Press ▼ or ▲ key to set Leave time. SET SET M18566 b. Press ▼ or ▲ key to set Leave temperature. Return a. CT3451 PROGRAMMABLE THERMOSTAT SET M12625C 2. M20558 b. Press Select. Press Select. Press Select. SET SET M18568 b. Press Select. SET SET M20563 M12631C 69-1620-1 8 Leave. Return a. Press ▼...
Owner's Manual
Page 9
...5. SET 11 SET FAN AND SYSTEM SWITCHES Manually control Fan and System settings using the switches located at the bottom of the thermostat case. Fig. 14 for improved air circulation. Repeat programming steps to set Sleep time. In heating, the fan is complete. ...Fan switches. Use for switch locations. Press Select. Sleep a. Press ▼ or ▲ key to display present temperature setting. CT3451 PROGRAMMABLE THERMOSTAT Setting Indefinite Temperature Hold The Hold key allows you to set a temporary temperature setting. End is active, the letters Hld are :...
...5. SET 11 SET FAN AND SYSTEM SWITCHES Manually control Fan and System settings using the switches located at the bottom of the thermostat case. Fig. 14 for improved air circulation. Repeat programming steps to set Sleep time. In heating, the fan is complete. ...Fan switches. Use for switch locations. Press Select. Sleep a. Press ▼ or ▲ key to display present temperature setting. CT3451 PROGRAMMABLE THERMOSTAT Setting Indefinite Temperature Hold The Hold key allows you to set a temporary temperature setting. End is active, the letters Hld are :...
Owner's Manual
Page 10
...is below the room temperature. Backlighting ❑ Press any key to remain off when the setpoint is triggered. Heat: The thermostat controls the heating system. ❑ Slide the System switch on again for five minutes before restarting. Allow compressor to light ... setting several degrees above the room temperature. The heating equipment should shut down . CT3451 PROGRAMMABLE THERMOSTAT 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 .
...is below the room temperature. Backlighting ❑ Press any key to remain off when the setpoint is triggered. Heat: The thermostat controls the heating system. ❑ Slide the System switch on again for five minutes before restarting. Allow compressor to light ... setting several degrees above the room temperature. The heating equipment should shut down . CT3451 PROGRAMMABLE THERMOSTAT 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 .
Owner's Manual
Page 11
...or displays "bAtLo," install fresh batteries. • Allow time for the furnace to heat up to 37°C). TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Your thermostat has reached the temperature limit. replace them as soon as possible. Make sure the current day and time are low; Reprogram...Temperature display does not go lower than 40°F (4°C) or higher than the current room temperature and the flame is displaying, the thermostat is operating correctly. Display does not come on indicator ( = heat; = cool) is lighted, but no hot or cool air coming...
...or displays "bAtLo," install fresh batteries. • Allow time for the furnace to heat up to 37°C). TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Your thermostat has reached the temperature limit. replace them as soon as possible. Make sure the current day and time are low; Reprogram...Temperature display does not go lower than 40°F (4°C) or higher than the current room temperature and the flame is displaying, the thermostat is operating correctly. Display does not come on indicator ( = heat; = cool) is lighted, but no hot or cool air coming...
Owner's Manual
Page 12
... FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-1620-1 ...be free from the date of incidental or consequential damages, so this warranty, please write Honeywell Customer Relations, 1985 Douglas Dr N, MN10-1461, Golden Valley, MN 55422. CT3451 PROGRAMMABLE THERMOSTAT PERCENT OF HEATING COSTS YOU CAN SAVE SAVINGS FOR ONCE-A-DAY 10°F (5°C) ...
... FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 69-1620-1 ...be free from the date of incidental or consequential damages, so this warranty, please write Honeywell Customer Relations, 1985 Douglas Dr N, MN10-1461, Golden Valley, MN 55422. CT3451 PROGRAMMABLE THERMOSTAT PERCENT OF HEATING COSTS YOU CAN SAVE SAVINGS FOR ONCE-A-DAY 10°F (5°C) ...