Owner's Manual
Page 1
...OF A MERCURY SWITCH IN A THERMOSTAT M10614 LEVEL, IF NEEDED TO LEVEL THERMOSTAT FOR APPEARANCE M20551 Fig. 1. See Fig. 1. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this thermostat is replacing a control that can provide you comfortable while saving energy when ...10065; Acquire tools and items, as needed. If not, return it properly. Registered Trademark Copyright © 2003 Honeywell • •All Rights Reserved 69-1620-1 Required installation tools/supplies. ® U.S. Contact your old control in a sealed tube, do not place your local waste ...
...OF A MERCURY SWITCH IN A THERMOSTAT M10614 LEVEL, IF NEEDED TO LEVEL THERMOSTAT FOR APPEARANCE M20551 Fig. 1. See Fig. 1. CT3451 Programmable Thermostat OWNER'S GUIDE MERCURY NOTICE If this thermostat is replacing a control that can provide you comfortable while saving energy when ...10065; Acquire tools and items, as needed. If not, return it properly. Registered Trademark Copyright © 2003 Honeywell • •All Rights Reserved 69-1620-1 Required installation tools/supplies. ® U.S. Contact your old control in a sealed tube, do not place your local waste ...
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 2-wire Honeywell zone valves. As you can damage equipment. Wrapping wires around a pencil to keep them...On switch, this thermostat works with your system, visit our Web site at www.honeywell.com/yourhome or call the customer information line at furnace or main breaker/ fuse box before beginning installation. ❑ Carefully unpack your retailer. CAUTION Equipment Damage Hazard. Disconnect the wires...
... 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 2-wire Honeywell zone valves. As you can damage equipment. Wrapping wires around a pencil to keep them...On switch, this thermostat works with your system, visit our Web site at www.honeywell.com/yourhome or call the customer information line at furnace or main breaker/ fuse box before beginning installation. ❑ Carefully unpack your retailer. CAUTION Equipment Damage Hazard. Disconnect the wires...
Owner's Manual
Page 4
...hookup with 2-wire, heatonly system. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER SYSTEM. 3 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. M20511 Fig....PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. THERMOSTAT G Rc R W B Y O FAN COIL 1 L1 (HOT) L2 COOLIING CONTRACTOR COIL 24V 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 POWER ...
...hookup with 2-wire, heatonly system. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER SYSTEM. 3 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. M20511 Fig....PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. THERMOSTAT G Rc R W B Y O FAN COIL 1 L1 (HOT) L2 COOLIING CONTRACTOR COIL 24V 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 POWER ...
Owner's Manual
Page 5
...; Slide System switch to the Off position. ❑ Engage the tabs at the factory in Fig. 13. M20512 CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to lack of the thermostat and wallplate. 7 INSTALLING AND REPLACING BATTERIES The thermostat requires three AA alkaline batteries to turn on the digital display to alert the...
...; Slide System switch to the Off position. ❑ Engage the tabs at the factory in Fig. 13. M20512 CT3451 PROGRAMMABLE THERMOSTAT ❑ Swing down due to lack of the thermostat and wallplate. 7 INSTALLING AND REPLACING BATTERIES The thermostat requires three AA alkaline batteries to turn on the digital display to alert the...
Owner's Manual
Page 6
...1, 3, 4, 5, 6, 9, or 12 is shown, but information displayed varies by model). Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to 52°F (11°C). Temperature (°F). - Gas or oil forced...;C indication and the heat cycle rate. ❑ Enter Installer Setup. - Press ▼ and ▲ keys simultaneously for factory use only.) M20514 Fig. 13. C3 = Aggressive control algorithm (Default. CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf...
...1, 3, 4, 5, 6, 9, or 12 is shown, but information displayed varies by model). Installing batteries. ❑ Restore power to the heating/cooling system. 8 CUSTOMIZE YOUR THERMOSTAT Your Honeywell thermostat comes preset to 52°F (11°C). Temperature (°F). - Gas or oil forced...;C indication and the heat cycle rate. ❑ Enter Installer Setup. - Press ▼ and ▲ keys simultaneously for factory use only.) M20514 Fig. 13. C3 = Aggressive control algorithm (Default. CT3451 PROGRAMMABLE THERMOSTAT AA BATTERIES (3) PM TUE AuFtoANOn Hold Select CoolSOYfSf...
Owner's Manual
Page 7
... is preprogrammed for factory use the preprogrammed time and temperature settings (see Table 3. PM M12590A Table 2. bRefer to set Wake time. CT3451 PROGRAMMABLE THERMOSTAT NOTE: The heating and cooling program times are sleeping. Setting Current Time and Day 1. Press ▼ or ▲ key... key to program. Leave is the time period when you come home during the day. SET M18534 To use only.) M14692 ❑ Exit Installer Setup. - see Table 3), press Hold to normal operation. Wake a. SET M18570 b. System Steam, gravity Hydronic heat, condensing gas furnacesa Gas...
... is preprogrammed for factory use the preprogrammed time and temperature settings (see Table 3. PM M12590A Table 2. bRefer to set Wake time. CT3451 PROGRAMMABLE THERMOSTAT NOTE: The heating and cooling program times are sleeping. Setting Current Time and Day 1. Press ▼ or ▲ key... key to program. Leave is the time period when you come home during the day. SET M18534 To use only.) M14692 ❑ Exit Installer Setup. - see Table 3), press Hold to normal operation. Wake a. SET M18570 b. System Steam, gravity Hydronic heat, condensing gas furnacesa Gas...
Owner's Manual
Page 10
... is triggered. Refer to Auto. 2. the cooling equipment should turn off for at too low of five minutes to remain off . CT3451 PROGRAMMABLE THERMOSTAT System Switch ❑ The System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. If... Slide the System switch on again for five minutes before restarting. Off: Both heating and cooling are off -timer 12 CHECK OPERATION AFTER INSTALLATION/PROGRAMMING Heating System ❑ Slide the System switch to Heat and the Fan switch to Auto. ❑ Press and hold the ▲...
... is triggered. Refer to Auto. 2. the cooling equipment should turn off for at too low of five minutes to remain off . CT3451 PROGRAMMABLE THERMOSTAT System Switch ❑ The System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. If... Slide the System switch on again for five minutes before restarting. Off: Both heating and cooling are off -timer 12 CHECK OPERATION AFTER INSTALLATION/PROGRAMMING Heating System ❑ Slide the System switch to Heat and the Fan switch to Auto. ❑ Press and hold the ▲...
Owner's Manual
Page 11
...for assistance. Then ... Your thermostat has reached the temperature limit. Be sure that the System switch is blank or says "bAtLo," install fresh batteries. • The thermostat has a built-in the wall behind the mounting plate with insulation to prevent drafts that can...." Make sure the current day and time are fresh and installed correctly. Adjust heat cycle rate in question. Wait five minutes until Replace Battery indicator is coming from the registers. TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Reprogram if necessary. Wait five minutes after...
...for assistance. Then ... Your thermostat has reached the temperature limit. Be sure that the System switch is blank or says "bAtLo," install fresh batteries. • The thermostat has a built-in the wall behind the mounting plate with insulation to prevent drafts that can...." Make sure the current day and time are fresh and installed correctly. Adjust heat cycle rate in question. Wait five minutes until Replace Battery indicator is coming from the registers. TROUBLESHOOTING CT3451 PROGRAMMABLE THERMOSTAT Table 4. Reprogram if necessary. Wait five minutes after...