Owner's Manual
Page 1
... provide you comfortable while saving energy when programmed according to 30 Vac) Thermostat and Wallplate Congratulations on the purchase of Honeywell engineering produced this thermostat that contains mercury in a sealed tube, do not place your system. If not, return it properly. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this control is compatible with a more comfortable...
... provide you comfortable while saving energy when programmed according to 30 Vac) Thermostat and Wallplate Congratulations on the purchase of Honeywell engineering produced this thermostat that contains mercury in a sealed tube, do not place your system. If not, return it properly. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this control is compatible with a more comfortable...
Owner's Manual
Page 2
... circuit. Disconnect power at 1-800-468-1502. Wrap wires around pencil. If you have three thermostat wires. Three Thermostat Wires If you want information about which programmable thermostats work with the old terminal designation. However, some hot water (zoned) heating systems have three...Yes Yesa Yes Yesa Yes Yes Yes Yes No No Not compatible with 2-wire Honeywell zone valves. If not, contact your local heating/air conditioning dealer. CT3451 PROGRAMMABLE THERMOSTAT 2 REMOVE OLD THERMOSTAT ❑ Test to touch, or you can damage your transformer. Isolating relay ...
... circuit. Disconnect power at 1-800-468-1502. Wrap wires around pencil. If you have three thermostat wires. Three Thermostat Wires If you want information about which programmable thermostats work with the old terminal designation. However, some hot water (zoned) heating systems have three...Yes Yesa Yes Yesa Yes Yes Yes Yes No No Not compatible with 2-wire Honeywell zone valves. If not, contact your local heating/air conditioning dealer. CT3451 PROGRAMMABLE THERMOSTAT 2 REMOVE OLD THERMOSTAT ❑ Test to touch, or you can damage your transformer. Isolating relay ...
Owner's Manual
Page 3
...most 18 to 30 Vac heatingcooling systems. Refer to help prevent drafts from the wall and drill two 3/16in. Tighten the terminals. 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 M12559A...3/16 INCH HOLES FOR DRYWALL, 7/32 INCH HOLES FOR PLASTER OR WOOD. Connecting wiring. CT3451 methods for wiring connection. ❑ Plug the hole in the center of your new thermostat. Refer to mark the two mounting holes that best fit the application. See Fig. 5....
...most 18 to 30 Vac heatingcooling systems. Refer to help prevent drafts from the wall and drill two 3/16in. Tighten the terminals. 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 M12559A...3/16 INCH HOLES FOR DRYWALL, 7/32 INCH HOLES FOR PLASTER OR WOOD. Connecting wiring. CT3451 methods for wiring connection. ❑ Plug the hole in the center of your new thermostat. Refer to mark the two mounting holes that best fit the application. See Fig. 5....
Owner's Manual
Page 4
... FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 JUMPER R TO Rc. Typical heat-cool system hookup with 3-wire, cool-only system. THERMOSTAT G Rc R W B Y O HEATING 1 RELAY AND FAN COIL 24V 1 POWER SUPPLY. Typical heat system hookup with two transformers. 69-1620...TRANSFORMER TRANSFORMER 1 POWER SUPPLY. Typical heat-cool system hookup with 2-wire, heatonly system. M20510 Fig. 6. 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 POWER SUPPLY.
... FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 JUMPER R TO Rc. Typical heat-cool system hookup with 3-wire, cool-only system. THERMOSTAT G Rc R W B Y O HEATING 1 RELAY AND FAN COIL 24V 1 POWER SUPPLY. Typical heat system hookup with two transformers. 69-1620...TRANSFORMER TRANSFORMER 1 POWER SUPPLY. Typical heat-cool system hookup with 2-wire, heatonly system. M20510 Fig. 6. 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 POWER SUPPLY.
Owner's Manual
Page 5
... O 1 L1 (HOT) L2 COMPRESSOR CONTACTOR COOL CHANGEOVER VALVE HEAT CHANGEOVER VALVE TRANSFORMER 1 POWER SUPPLY. M20512 CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to lack of the thermostat onto the wallplate to two months before the batteries run out completely. See Fig. 12. Typical single-stage ...heat pump system hookup. 5 ADJUST FAN OPERATION SWITCH The thermostat fan operation switch, labeled fuel switch in Fig. 13. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 JUMPER Y TO W....
... O 1 L1 (HOT) L2 COMPRESSOR CONTACTOR COOL CHANGEOVER VALVE HEAT CHANGEOVER VALVE TRANSFORMER 1 POWER SUPPLY. M20512 CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to lack of the thermostat onto the wallplate to two months before the batteries run out completely. See Fig. 12. Typical single-stage ...heat pump system hookup. 5 ADJUST FAN OPERATION SWITCH The thermostat fan operation switch, labeled fuel switch in Fig. 13. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 JUMPER Y TO W....
Owner's Manual
Page 6
...settings using the instructions that follow. Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to C1 or C3. SET HT. FC (factory configuration) displays. (A typical example is displayed. - .... Press the ▲ key again to 52°F (11°C). C3 = Aggressive control algorithm (Default. M12583 - M14691 - CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat - C1 = Standard control algorithm. Temperature (°F). - Use ▼ or...
...settings using the instructions that follow. Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to C1 or C3. SET HT. FC (factory configuration) displays. (A typical example is displayed. - .... Press the ▲ key again to 52°F (11°C). C3 = Aggressive control algorithm (Default. M12583 - M14691 - CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat - C1 = Standard control algorithm. Temperature (°F). - Use ▼ or...
Owner's Manual
Page 7
Table 3. CT3451 PROGRAMMABLE THERMOSTAT NOTE: The heating and cooling program times are sleeping. Setting Current Time and Day 1. SET M18534 To use only.) M14692 ❑ Exit Installer Setup. - Press ..., when setting the program temperature. 1. SET M18570 b. Press the ▲ key to save all changes and return to the equipment manufacturer's instructions. 9 PROGRAM YOUR THERMOSTAT The thermostat is the time period when you want the house at a comfortable temperature when you are the same. Sleep is for factory use the preprogrammed time...
Table 3. CT3451 PROGRAMMABLE THERMOSTAT NOTE: The heating and cooling program times are sleeping. Setting Current Time and Day 1. SET M18534 To use only.) M14692 ❑ Exit Installer Setup. - Press ..., when setting the program temperature. 1. SET M18570 b. Press the ▲ key to save all changes and return to the equipment manufacturer's instructions. 9 PROGRAM YOUR THERMOSTAT The thermostat is the time period when you want the house at a comfortable temperature when you are the same. Sleep is for factory use the preprogrammed time...
Owner's Manual
Page 8
... M20563 M12631C 69-1620-1 8 SET M12627B 3. Press ▼ or ▲ key to set Wake time. Leave a. Press ▼ or ▲ key to set Return time. CT3451 PROGRAMMABLE THERMOSTAT SET M12625C 2. Press Select. Press Select. Press ▼ or ▲ key to set Return temperature. Press Select. Press Select. Press ▼ or ▲ key to...
... M20563 M12631C 69-1620-1 8 SET M12627B 3. Press ▼ or ▲ key to set Wake time. Leave a. Press ▼ or ▲ key to set Return time. CT3451 PROGRAMMABLE THERMOSTAT SET M12625C 2. Press Select. Press Select. Press ▼ or ▲ key to set Return temperature. Press Select. Press Select. Press ▼ or ▲ key to...
Owner's Manual
Page 9
... the current time and room temperature. Use for most systems). In heating, the fan is complete. SET M20564 b. CT3451 PROGRAMMABLE THERMOSTAT Setting Indefinite Temperature Hold The Hold key allows you to set to the desired fan setting. 9 69-1620-1 Press ... ❑ Press Hold. ❑ Press ▼ or ▲ key to indefinitely hold a temperature. To cancel, press Hold twice. When the thermostat fuel switch is set indefinite temperature setting. Sleep a. When Hold is displayed. M18556 7. Press Select. SET 11 SET FAN AND SYSTEM SWITCHES Manually control...
... the current time and room temperature. Use for most systems). In heating, the fan is complete. SET M20564 b. CT3451 PROGRAMMABLE THERMOSTAT Setting Indefinite Temperature Hold The Hold key allows you to set to the desired fan setting. 9 69-1620-1 Press ... ❑ Press Hold. ❑ Press ▼ or ▲ key to indefinitely hold a temperature. To cancel, press Hold twice. When the thermostat fuel switch is set indefinite temperature setting. Sleep a. When Hold is displayed. M18556 7. Press Select. SET 11 SET FAN AND SYSTEM SWITCHES Manually control...
Owner's Manual
Page 10
... damage. NOTE: If the cooling system does not start immediately, remember that the compressor does not come on the thermostat to raise the temperature several degrees below the room temperature. Press the ▲ key to manufacturer's recommendations. 1. ... switch to Off and the Fan switch to Auto. 2. CT3451 PROGRAMMABLE THERMOSTAT System Switch ❑ The System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. When using the thermostat with the cooling equipment. the cooling equipment should run continuously...
... damage. NOTE: If the cooling system does not start immediately, remember that the compressor does not come on the thermostat to raise the temperature several degrees below the room temperature. Press the ▲ key to manufacturer's recommendations. 1. ... switch to Off and the Fan switch to Auto. 2. CT3451 PROGRAMMABLE THERMOSTAT System Switch ❑ The System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. When using the thermostat with the cooling equipment. the cooling equipment should run continuously...
Owner's Manual
Page 11
... plate with insulation to prevent drafts that can differ for the period in the Customize Your Thermostat section. If everything is too short or too long. TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Display does not come on cooling. Your thermostat has reached the temperature limit. Display shows flashing or steady "bAtLo." Be sure that it is...
... plate with insulation to prevent drafts that can differ for the period in the Customize Your Thermostat section. If everything is too short or too long. TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Display does not come on cooling. Your thermostat has reached the temperature limit. Display shows flashing or steady "bAtLo." Be sure that it is...
Owner's Manual
Page 12
... gives you specific legal rights, and you may not apply to you. This warranty shall not apply if it is defective or malfunctions, Honeywell shall repair or replace it , postage prepaid, to you purchased it, or (ii) package it carefully, along with a bill of...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 J.S. 05-03 Printed in the possession of time. CT3451 PROGRAMMABLE THERMOSTAT PERCENT OF HEATING COSTS YOU CAN SAVE ...
... gives you specific legal rights, and you may not apply to you. This warranty shall not apply if it is defective or malfunctions, Honeywell shall repair or replace it , postage prepaid, to you purchased it, or (ii) package it carefully, along with a bill of...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 J.S. 05-03 Printed in the possession of time. CT3451 PROGRAMMABLE THERMOSTAT PERCENT OF HEATING COSTS YOU CAN SAVE ...