Owner's Manual
Page 1
... regarding recycling and the proper disposal of it to these instructions. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this control is compatible with a more comfortable and convenient living environment. See Fig. 1. Required installation tools/supplies. ® U.S. Registered Trademark Copyright © 2003 Honeywell • •All Rights Reserved 69-1620-1 More than 100 years...
... regarding recycling and the proper disposal of it to these instructions. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this control is compatible with a more comfortable and convenient living environment. See Fig. 1. Required installation tools/supplies. ® U.S. Registered Trademark Copyright © 2003 Honeywell • •All Rights Reserved 69-1620-1 More than 100 years...
Owner's Manual
Page 2
...labels (enclosed) to label each wire with any 120/240 volt circuit. do not require labeling. Three Thermostat Wires If you want information about which programmable thermostats work with these systems. For details, contact a local heating/cooling contractor. 69-1620-1 2 Compatibility ... installation can interfere with 2-wire Honeywell zone valves. As you can operate the fan using electrical tape; Record the colors and terminal designation labels of a multistage heat pump or other multistage system. CT3451 PROGRAMMABLE THERMOSTAT 2 REMOVE OLD THERMOSTAT ❑ Test to be sure...
...labels (enclosed) to label each wire with any 120/240 volt circuit. do not require labeling. Three Thermostat Wires If you want information about which programmable thermostats work with these systems. For details, contact a local heating/cooling contractor. 69-1620-1 2 Compatibility ... installation can interfere with 2-wire Honeywell zone valves. As you can operate the fan using electrical tape; Record the colors and terminal designation labels of a multistage heat pump or other multistage system. CT3451 PROGRAMMABLE THERMOSTAT 2 REMOVE OLD THERMOSTAT ❑ Test to be sure...
Owner's Manual
Page 3
Level the wallplate for appearance only. 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 MOUNTING SCREWS (2) WALLPLATE 1 WHEN ...adaptable to most 18 to 30 Vac heatingcooling systems. Refer to Fig. 4. Refer to Fig. 6 through the wiring opening. See Fig. 5. holes. The CT3451 Thermostat is powered with the wall. ❑ Reposition the wallplate, pulling wires through 10 for typical system wiring diagrams. 3 69-1620-1 holes in . Gently tap...
Level the wallplate for appearance only. 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 MOUNTING SCREWS (2) WALLPLATE 1 WHEN ...adaptable to most 18 to 30 Vac heatingcooling systems. Refer to Fig. 4. Refer to Fig. 6 through the wiring opening. See Fig. 5. holes. The CT3451 Thermostat is powered with the wall. ❑ Reposition the wallplate, pulling wires through 10 for typical system wiring diagrams. 3 69-1620-1 holes in . Gently tap...
Owner's Manual
Page 4
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. THERMOSTAT G Rc R W B Y O HEATING 1 RELAY AND FAN COIL 24V 1 POWER SUPPLY. Typical cool system hookup with... TWO TRANSFORMER SYSTEM. 3 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. M20511 Fig. 9. 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 ...
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. THERMOSTAT G Rc R W B Y O HEATING 1 RELAY AND FAN COIL 24V 1 POWER SUPPLY. Typical cool system hookup with... TWO TRANSFORMER SYSTEM. 3 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. M20511 Fig. 9. 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 ...
Owner's Manual
Page 5
... CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to lack of the thermostat onto the wallplate to latch. DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT Hold Select AuFtoANOn Cool SOYfSf THEeMat A ENGAGE TABS AT TOP OF THERMOSTAT WITH SLOTS ON WALLPLATE. Fig. 10. Fan operation (fuel) switch. 6 MOUNT THERMOSTAT TO...the F (gas/oil fuel) position. PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat B PRESS LOWER EDGE OF CASE TO LATCH. Mounting thermostat to two months before the batteries run out completely. See Fig. 12. The E setting allows the fan to turn on the right...
... CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to lack of the thermostat onto the wallplate to latch. DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT Hold Select AuFtoANOn Cool SOYfSf THEeMat A ENGAGE TABS AT TOP OF THERMOSTAT WITH SLOTS ON WALLPLATE. Fig. 10. Fan operation (fuel) switch. 6 MOUNT THERMOSTAT TO...the F (gas/oil fuel) position. PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat B PRESS LOWER EDGE OF CASE TO LATCH. Mounting thermostat to two months before the batteries run out completely. See Fig. 12. The E setting allows the fan to turn on the right...
Owner's Manual
Page 6
...Can cause overshooting.) 69-1620-1 6 M12583 - Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to display the current setting. - Press ▼ and ▲ keys simultaneously for more than two seconds to C1...equipment). - Press the ▼ key to change the heat cycle rate, press the ▼ key until End displays. CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat - FC (factory configuration) displays. (A typical example is displayed, press...
...Can cause overshooting.) 69-1620-1 6 M12583 - Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to display the current setting. - Press ▼ and ▲ keys simultaneously for more than two seconds to C1...equipment). - Press the ▼ key to change the heat cycle rate, press the ▼ key until End displays. CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf THEeMat - FC (factory configuration) displays. (A typical example is displayed, press...
Owner's Manual
Page 7
...; key to normal operation. To set Wake time. 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 the same.
...; key to normal operation. To set Wake time. 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 the same.
Owner's Manual
Page 8
... Programs To set Wake time. Press ▼ or ▲ key to set the Saturday program: 1. SET SET M12629B 4. Press Select. Press Select. Press Select. Leave. CT3451 PROGRAMMABLE THERMOSTAT SET M12625C 2. SET SET M20563 M12631C 69-1620-1 8
... Programs To set Wake time. Press ▼ or ▲ key to set the Saturday program: 1. SET SET M12629B 4. Press Select. Press Select. Press Select. Leave. CT3451 PROGRAMMABLE THERMOSTAT SET M12625C 2. SET SET M20563 M12631C 69-1620-1 8
Owner's Manual
Page 9
...CT3451 PROGRAMMABLE THERMOSTAT Setting Indefinite Temperature Hold The Hold key allows you to set a temporary temperature setting. SET 11 SET FAN AND SYSTEM SWITCHES Manually control Fan and System settings using the switches located at the bottom of the thermostat case. After approximately five seconds, the thermostat... Sunday Program section to display present temperature setting. To cancel, press Hold twice. SET M12641A M20565 5. The thermostat reverts to set indefinite temperature setting. Fan Switch ❑ The Fan switch settings are displayed continuously. Auto: Normal...
...CT3451 PROGRAMMABLE THERMOSTAT Setting Indefinite Temperature Hold The Hold key allows you to set a temporary temperature setting. SET 11 SET FAN AND SYSTEM SWITCHES Manually control Fan and System settings using the switches located at the bottom of the thermostat case. After approximately five seconds, the thermostat... Sunday Program section to display present temperature setting. To cancel, press Hold twice. SET M12641A M20565 5. The thermostat reverts to set indefinite temperature setting. Fan Switch ❑ The Fan switch settings are displayed continuously. Auto: Normal...
Owner's Manual
Page 10
... ▲ key to raise the temperature setting above the room temperature to protect the compressor. 3. CT3451 PROGRAMMABLE THERMOSTAT System Switch ❑ The System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. Heat: The thermostat controls the heating system. ❑ Slide the System switch on again for cool. Heat and Cool...
... ▲ key to raise the temperature setting above the room temperature to protect the compressor. 3. CT3451 PROGRAMMABLE THERMOSTAT System Switch ❑ The System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. Heat: The thermostat controls the heating system. ❑ Slide the System switch on again for cool. Heat and Cool...
Owner's Manual
Page 11
TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Then ... Your thermostat has reached the temperature limit. replace them as soon as possible. Make sure the current day and time are low; The thermostat current setting does not match the displayed room temperature to within plus or minus 1°. ... If display is blank or displays "bAtLo," install fresh batteries. • Allow time for the period in the Customize Your Thermostat section. Display does not come on . Display shows flashing or steady "bAtLo." If everything is operating correctly. Be sure that...
TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Then ... Your thermostat has reached the temperature limit. replace them as soon as possible. Make sure the current day and time are low; The thermostat current setting does not match the displayed room temperature to within plus or minus 1°. ... If display is blank or displays "bAtLo," install fresh batteries. • Allow time for the period in the Customize Your Thermostat section. Display does not come on . Display shows flashing or steady "bAtLo." If everything is operating correctly. Be sure that...
Owner's Manual
Page 12
...THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. Some states do not allow limitations on recycled paper containing at any questions concerning this limitation may not apply to state. CT3451 PROGRAMMABLE THERMOSTAT PERCENT OF HEATING COSTS YOU CAN SAVE... YEAR DURATION OF THIS WARRANTY. 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...
...THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. Some states do not allow limitations on recycled paper containing at any questions concerning this limitation may not apply to state. CT3451 PROGRAMMABLE THERMOSTAT PERCENT OF HEATING COSTS YOU CAN SAVE... YEAR DURATION OF THIS WARRANTY. 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...