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Honeywell CT70, Wiring Manual

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Summary of Contents for CT70

Page 1: ...1 CT70 Heat Pump Thermostat Wiring Guide ...

Page 2: ...2 ...

Page 3: ...ng thermostat coincide with the terminals shown in the second column Existing thermostat wiring If they do read and follow the installation instructions provided with the thermostat If they do not call Honeywell Customer Assistance toll free at 1 800 468 1502 Monday Friday 7 00 a m 5 30 p m Central time to be sure you can safely use this thermostat to control your heat pump Before you call please ...

Page 4: ...4 ...

Page 5: ...Heat Pump Manufacturers 11 22 Amana 11 American Standard 20 Arcoaire 13 Bard 12 Borg Warner 21 22 B D P Bryant Day Night Payne 14 Carrier 15 Comfortmaker 13 Friedrich 16 Heil Quaker 17 Janitrol 12 Lennox 18 Luxaire Moncrief Fraser Johnston 21 Rheem 19 Ruud 19 Snyder General 13 Tappan 12 Tempstar 17 Trane 20 Whirlpool 17 Williamson 12 York 21 22 ...

Page 6: ...stems usually have a supplemental Second Stage heating system that operates only when necessary This heat pump thermostat is designed to minimize more expensive second stage operation indicated by the green AUX HEAT light on your thermostat ...

Page 7: ...high heat demand the thermostat will call for additional Second Stage power from the auxiliary heat system This auxiliary heat is commonly electric resistance heat and is two to three times more expensive to operate than the compressor If you have specific questions concerning the operation of your heat pump please contact the equipment manufacturer INDOOR AIR OUTDOOR AIR HEAT TRANSFER AUXILIARY H...

Page 8: ...p is on and cooling the living space COMPRESSOR When this terminal is activated the heat pump is on and either heating or cooling the living space depending on the system switch position C O VALVE HEAT Heating Changeover Valve This terminal is activated when the system switch is in the HEAT position It provides changeover in heat pumps that change over in heating C O VALVE COOL Cooling Changeover ...

Page 9: ...al is not connected to the CT70 On your original thermostat this terminal was activated by an outdoor sensor that controlled the auxiliary heat source OUTDOOR STAT Outdoor Thermostat This terminal is activated when the system switch is in the EM HT position The outdoor thermostat controls the amount of auxiliary heat that is activated POWER This terminal connects to the power side of the 24 volt t...

Page 10: ...ON AS REQUIRED REMOVE W1 Y1 JUMPER WHEN HEAT RELAY 1 IS USED WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR EM HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION 1 2 3 4 COMPRESSOR CONTACTOR FAN RELAY EM HEAT RELAY CHANGEOVER RELAY HEAT HEAT RELAY 1 CHANGEOVER RELAY COOL AUX HEAT RELAY SYSTEM MONITOR 2 3 4 ...

Page 11: ...ctory installed jumper for independent stage 1 heat and cool connection W1 Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL EM HEAT SYSTEM MONITOR W1 W2 W2 G G O O L 3 C X 2 X1 or RH R RC or R or 1 Y1 Y1 Y or B B or E E W ...

Page 12: ...ads to W2 terminals Thermostat is connected to either O or B terminal but not both Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT MULTIPLE AUX HEAT LOADS W1 W2 W2 G G 2 X X X1 or C or 1 E E 1 Y Y1 L L B O W3 3 R R RC or RHor W1 B or 3 4 4 O ...

Page 13: ...common Leave factory installed jumper in place Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT C X R R Y Y1 W1 W1 W2 G G O O B 1 2 1 X L E E W2 or L or X X1 or ...

Page 14: ...second stage heating loads to W2 terminals Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT MULTIPLE AUX HEAT LOADS DEFROST R R Y Y1 W1 W2 W2 G G O O F L E E B B W3 P P 2 3 C 1 X or W1 Y1 X L or or or or 3 C1 X1 or 1 ...

Page 15: ...ve factory installed jumper in place Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT C X R R Y Y1 W1 W2 W2 G G O O B 1 2 1 L L E E F W1 or or ...

Page 16: ...the wire Jumper is not required on this thermostat CT70 Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT W1 W2 W2 G G 2 X 1 X2 E 1 R Y Y1 W1 B B U 3 RC RH or C Y1 O L L or X1 X or or Y2 E O W3 or or or ...

Page 17: ...ormer common Leave factory installed jumper in place Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT B X R R W W2 G G O O 1 L X E B B Y Y1 W1 2 C or ...

Page 18: ...led jumper in place R Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER 1ST STG HEAT COMP 1ST STG COOL 2ND STG HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT X X Y W2 1 E E L M W1 B V VR Y1 2 F G R O or Y BL or R or Y R O BK or or or ...

Page 19: ...on Leave factory installed jumper in place Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT X X R R Y Y1 W1 W2 W2 G G O O 1 2 1 L L E E B B ...

Page 20: ... off end CT70 replaces outdoor reset with improved zero droop performance Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR OUTDOOR SENSOR OUTDOOR STAT B X R R W W2 G G O O 1 Y Y1 W1 B L L T X2 E 1 2 3 W1 W2 F or or or ...

Page 21: ...2 terminals Leave factory installed jumper in place If present on original equipment Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER COMPRESSOR 1ST STG HEAT AUX HEAT FAN C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT MULTIPLE AUX HEAT LOADS W1 W2 W2 G G 3 Y Y1 H B W3 O O L L R R 4 E E 4 2 4 or or X 1 X or X B W ...

Page 22: ... common Remove factory installed jumper Wiring terminal function Existing thermostat wiring New thermostat wiring COMMON POWER 1ST STG HEAT AUX HEAT FAN 1ST STG COOL C O VALVE HEAT C O VALVE COOL SYSTEM MONITOR EM HEAT X2 X R R W1 W1 G G Y1 Y1 2 1 B W2 W2 O L E E or B ...

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Page 24: ...69 0866 2 C H Rev 01 95 www honeywell com yourhome Automation and Control Solutions Honeywell International Inc 1985 Douglas Drive North Golden Valley MN 55422 ...

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