Honeywell CT70 Owner's Manual

Honeywell CT70 Manual

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  • Honeywell CT70 | Owner's Manual - Page 1
    CT70 Heat Pump Thermostat Wiring Guide 1
  • Honeywell CT70 | Owner's Manual - Page 2
    2
  • Honeywell CT70 | Owner's Manual - Page 3
    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
  • Honeywell CT70 | Owner's Manual - Page 4
    4
  • Honeywell CT70 | Owner's Manual - 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
  • Honeywell CT70 | Owner's Manual - Page 6
    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 secondstage operation, indicated by the green AUX. HEAT light on your thermostat. 6
  • Honeywell CT70 | Owner's Manual - Page 7
    . OUTDOORS SEVERE WEATHER INDOORS OUTDOOR AIR AUXILIARY HEATING ELEMENT ON INDOOR AIR HEAT TRANSFER M9078 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
  • Honeywell CT70 | Owner's Manual - Page 8
    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 Definition FIRST STG. HEAT: When this terminal is activated, the
  • Honeywell CT70 | Owner's Manual - Page 9
    for one auxiliary heat load, these loads must be connected to the AUXILIARY HEAT terminal. OUTDOOR SENSOR: This terminal 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
  • Honeywell CT70 | Owner's Manual - Page 10
    1 IS USED. 3 WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR, EM. HEAT. LED ALSO INDICATES COMPRESSOR MALFUNCTION. 4 X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION. M8504 Typical wiring hookup of CT70 with jumper intact. 10
  • Honeywell CT70 | Owner's Manual - Page 11
    C 1 R or RC or RH Y or Y1 W1 W2 G B or W O E AMANA New thermostat wiring 2 X R Y1 3 W1 W2 G B O E L ! 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. 11
  • Honeywell CT70 | Owner's Manual - Page 12
    C/O VALVE COOL 4O SYSTEM MONITOR L EM. HEAT E MULTIPLE AUX. HEAT LOADS 3 W3 New thermostat wiring 1 X R Y1 2 W1 W2 G B O L E 3 ! This terminal must be connected to transformer common. # Leave factory-installed jumper in place. $ Connect multiple second stage heating loads to W2 terminals
  • Honeywell CT70 | Owner's Manual - Page 13
    STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT Existing thermostat wiring 1 X,X1 or C R Y W2 or W1 G O L or X E New thermostat wiring 1 X R Y1 2 W1 W2 G B O L E ! This terminal must be connected to transformer common. # Leave factory-installed jumper in place. 13
  • Honeywell CT70 | Owner's Manual - Page 14
    MULTIPLE AUX. HEAT LOADS 3 DEFROST Existing thermostat wiring C1 or X1 or C 1 R W1 or Y W2 G B Y1 or O L or F X or E W3 P New thermostat wiring 1 X R Y1 2 W1 W2 G B 3 O L E P ! This terminal must be connected to transformer common. # Leave factory-installed jumper in place. $ Connect multiple
  • Honeywell CT70 | Owner's Manual - Page 15
    STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT Existing thermostat wiring 1 C R Y W1 or W2 G O F or L E CARRIER New thermostat wiring 1 X R Y1 2 W1 W2 G B O L E ! This terminal must be connected to transformer common. # Leave factory-installed jumper in place. 15
  • Honeywell CT70 | Owner's Manual - Page 16
    C or X1 RH or RC Y2 or Y W1 W2 G B O or Y1 L E or X2 W3 or U 3 New thermostat wiring 1 X R Y1 2 W1 W2 G B O L E ! 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). 16
  • Honeywell CT70 | Owner's Manual - Page 17
    COMPRESSOR 1ST STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT Existing thermostat wiring C or B R Y W G B O X New thermostat wiring 1 X R Y1 2 W1 W2 G B O L E ! This terminal must be connected to transformer common. # Leave factory-installed jumper in place. 17
  • Honeywell CT70 | Owner's Manual - Page 18
    STG. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT Existing thermostat wiring Y or X BL or V/VR R or M O or Y Y or F BK or R E New thermostat wiring 1 X R W1 Y1 2 W2 G B O L E ! This terminal must be connected to transformer common. # Leave factory-installed jumper in place. 18
  • Honeywell CT70 | Owner's Manual - Page 19
    1ST STG. HEAT AUX. HEAT FAN C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT Existing thermostat wiring 1 X R Y W2 G B O L E RHEEM/RUUD New thermostat wiring 1 X R Y1 2 W1 W2 G B O L E ! This terminal must be connected to transformer common. # Leave factory-installed jumper in place. 19
  • Honeywell CT70 | Owner's Manual - Page 20
    OUTDOOR SENSOR OUTDOOR STAT Existing thermostat wiring 1 B R Y W1 or W G O F or L T W2 or X2 New thermostat wiring 1 X R W1 2 Y1 W2 G B O L 3 E ! This terminal must be connected to transformer common. # Leave factory-installed jumper in place. $ Tape off end. CT70 replaces outdoor reset with
  • Honeywell CT70 | Owner's Manual - Page 21
    . HEAT LOADS Existing thermostat wiring X or B R Y W or W2 G H O 4 X or L 4 E 4 W3 New thermostat wiring 1 X R Y1 3 W1 W2 G B O L E 2 ! This terminal must be connected to transformer common. # Connect multiple second stage heating loads to W2 terminals. $ Leave factory-installed jumper in place
  • Honeywell CT70 | Owner's Manual - Page 22
    POWER 1ST STG. HEAT AUX. HEAT FAN 1ST STG. COOL C/O VALVE HEAT C/O VALVE COOL SYSTEM MONITOR EM. HEAT Existing thermostat wiring B or X2 R W1 W2 G Y1 E New thermostat wiring 1 X R W1 W2 G 2 Y1 B O L E ! This terminal must be connected to transformer common. # Remove factory-installed jumper. 22
  • Honeywell CT70 | Owner's Manual - Page 23
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  • Honeywell CT70 | Owner's Manual - 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
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CT70
Heat Pump
Thermostat Wiring Guide