23
WARNING:
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electrical connections. Also, the ground connection
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connections. Failure to do so can result in electrical
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transformer are required for the control circuit
of the system. The furnace or the air handler
transformer may be used if sufficient. See the
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Do not use phone cord to connect indoor and
outdoor units and thermostat. This could damage
the controls and may not be adequately sized for
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FIELD WIRE SIZE FOR 24-VOLT
THERMOSTAT CIRCUITS:
Runs up to 100 ft [30.5 m]: 18 AWG
Runs over 100 ft [30.5 m]: 16 AWG
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WIRE COLOR CODE
BK – BLACK GY – GRAY W – WHITE
BR – BROWN O – ORANGE Y – YELLOW
BL – BLUE PR – PURPLE
G – GREEN R – RED
Wiring
4.0 INSTALLATION
4.9 Control Wiring
4.10 Typical Control Wiring Connections
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diagrams for air handlers and a 2-stage heat pump
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and a 2-stage heat pump.
W2
W1
G
Air
Handler
Y1
E/W1
Typical Two-Stage Thermostat
2-Stage
Heat Pump
Outdoor
Unit
Y2
C
B
Y2
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
ODD
R
Y1
Y2
G
W2
R
Y1
C
L
D
Y
Y/BL
BL
R
BR
W/R
PR
*
B
C
B
R
2-STAGE HEAT PUMP WITH ELECTRIC HEAT USING A TYPICAL
2-STAGE THERMOSTAT
B
W2
W1
B
C
G
Air
Handler
Y1
E/W1
Typical Two-Stage Thermostat
2-Stage
Heat Pump
Outdoor
Unit
Y2
C
R
B
Y2
Field Installed
Line Voltage
-
WIRING INFORMATION
Factory Standard
-
ODD
R
Y1
Y2
G
W2
R
Y1
C
L
D
Y
Y/BL
BL
R
BR
W/R
PR
Humidistat
*
2-STAGE HEAT PUMP WITH ELECTRIC HEAT USING A TYPICAL
2-STAGE THERMOSTAT AND A HUMIDISTAT FOR DEHUMIDIFICA-
TION
*If maximum outlet temperature rise is desired, it is recommended that W1 and W2 be wired together.