Table of Contents
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Table of Contents
Related Manuals for Honeywell CT70
Summary of Contents for Honeywell CT70
- Page 1 CT70 Heat Pump Thermostat Wiring Guide...
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Page 3: How To Use This Guide
Before you disconnect the wires and remove your existing thermostat, be sure this new thermostat, see the CT70 wiring hookup diagram, will replace it and that you understand how you will reconnect the wiring. To do that, proceed as follows:... -
Page 5: Table Of Contents
How to Use This Guide ... 3 Heat Pumps are Different ... 6 Heat Pumps are Two Systems in One ... 7 Definitions of Terminal Functions ... 8,9 Heat Pump Manufacturers ... 11-22 Amana...11 American Standard... 20 Arcoaire... 13 Bard... 12 Borg Warner ... -
Page 6: Heat Pumps Are Different
HEAT PUMPS ARE DIFFERENT Heat pump systems 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: Heat Pumps Are Two Systems In One
OUTDOORS OUTDOOR HEAT TRANSFER During 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. -
Page 8: Definitions Of Terminal Functions
DEFINITIONS OF TERMINAL FUNCTIONS Each terminal of the CT70 controls a different heat pump function. Here is a list of the possible heat pump functions: Function FIRST STG. HEAT: AUXILIARY HEAT: FIRST STG. COOL: COMPRESSOR: C/O VALVE HEAT: C/O VALVE COOL: EM. - Page 9 This terminal is activated when additional auxiliary heat loads are required. Because the CT70 only has provisions for one auxiliary heat load, these loads must be connected to the AUXILIARY HEAT terminal. This terminal is not connected to the CT70.
- Page 10 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. Typical wiring hookup of CT70 with jumper intact. CHANGEOVER RELAY (COOL) SYSTEM...
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Page 11: Heat Pump Manufacturers
C/O VALVE COOL EM. HEAT SYSTEM MONITOR Jumper these two terminals if both are present This terminal must be connected to transformer common. Remove this factory-installed jumper for independent stage 1 heat and cool connection. Existing thermostat wiring AMANA thermostat wiring... -
Page 12: Bard
MULTIPLE AUX. HEAT LOADS This terminal must be connected to transformer common. Leave factory-installed jumper in place. Connect multiple second stage heating loads to W2 terminals. Thermostat is connected to either O or B terminal, but not both. Existing thermostat wiring... -
Page 13: Arcoaire
ARCOAIRE/SNYDER GENERAL/COMFORTMAKER Wiring terminal function COMMON POWER COMPRESSOR STG. HEAT AUX. HEAT C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT This terminal must be connected to transformer common. Leave factory-installed jumper in place. Existing thermostat wiring X,X1 thermostat wiring... -
Page 14: Bryant-Day/Night-Payne)
HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT MULTIPLE AUX. HEAT LOADS DEFROST This terminal must be connected to transformer common. Leave factory-installed jumper in place. Connect multiple second stage heating loads to W2 terminals. Existing thermostat wiring thermostat wiring... -
Page 15: Carrier
Wiring terminal function COMMON POWER COMPRESSOR STG. HEAT AUX. HEAT C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT This terminal must be connected to transformer common. Leave factory-installed jumper in place. Existing thermostat wiring CARRIER thermostat wiring... -
Page 16: Friedrich
C/O VALVE COOL SYSTEM MONITOR EM. HEAT This terminal must be connected to transformer common. Leave factory-installed jumper in place. Tape off the end of the wire. Jumper is not required on this thermostat (CT70). Existing thermostat wiring thermostat wiring... -
Page 17: Heil Quaker
HEIL QUAKER/WHIRLPOOL/TEMPSTAR Wiring terminal function COMMON POWER COMPRESSOR STG. HEAT AUX. HEAT C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT This terminal must be connected to transformer common. Leave factory-installed jumper in place. Existing thermostat wiring thermostat wiring... -
Page 18: Lennox
COMMON POWER STG. HEAT (COMP) STG. COOL STG. HEAT C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT This terminal must be connected to transformer common. Leave factory-installed jumper in place. Existing thermostat wiring V/VR thermostat wiring... -
Page 19: Rheem
Wiring terminal function COMMON POWER COMPRESSOR STG. HEAT AUX. HEAT C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT This terminal must be connected to transformer common. Leave factory-installed jumper in place. Existing thermostat wiring RHEEM/RUUD thermostat wiring... -
Page 20: American Standard
HEAT C/O VALVE COOL SYSTEM MONITOR OUTDOOR SENSOR OUTDOOR STAT This terminal must be connected to transformer common. Leave factory-installed jumper in place. Tape off end. CT70 replaces outdoor reset with improved zero droop performance. Existing thermostat wiring thermostat wiring... -
Page 21: Borg Warner
SYSTEM MONITOR EM. HEAT MULTIPLE AUX. HEAT LOADS This terminal must be connected to transformer common. Connect multiple second stage heating loads to W2 terminals. Leave factory-installed jumper in place. If present on original equipment. Existing thermostat wiring thermostat wiring... -
Page 22: York
YORK/BORG WARNER Wiring terminal function COMMON POWER STG. HEAT AUX. HEAT STG. COOL C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT This terminal must be connected to transformer common. Remove factory-installed jumper. Existing thermostat wiring thermostat wiring... - Page 24 Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 69-0866—2 C.H. Rev. 01-95 www.honeywell.com/yourhome...