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506377−01 11/09
Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is
located in the bottom of the control panel. Connect conduit to the control panel using a proper conduit fitting.
ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING
WIRE RUN LENGTH AWG# INSULATION TYPE
LESS THAN 100’ (30 METERS) 18 TEMPERATURE RATING
MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM.
Install low voltage wiring from outdoor to indoor unit and from
thermostat to indoor unit as illustrated.
HIGH VOLTAGE / GROUND WIRES
CONTROL WIRING
A Run 24VAC control wires through hole with grommet.
B Make 24VAC thermostat wire connections to CMC1.
NOTE For proper voltages, select thermostat wire (control
wires) gauge per Table above.
NOTE Wire tie provides low voltage wire strain relief and
to maintain separation of field installed low and high voltage
circuits.
NOTE Do not bundle any excess 24VAC control wires inside
control panel.
TYPICAL CONTROL WIRING
R
C
W1
Y1
O
G
R
C
W1
W2
W3
G
reversing valve
Thermostat
Indoor Unit
R
C
W1
Y1
O
Outdoor Unit
power
common
1st. stage aux. heat
indoor blower
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
power
common
1st. stage aux. heat
Low Voltage Wiring
R
C
W1
Y1
O
G
R
C
W1
W2
W3
G
Thermostat Indoor Unit Outdoor Unit
E
R
C
W1
Y1
O
1st. stage aux. heat
emer.
heat
relay
outdoor t’stat
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
reversing valve
power
common
1st. stage aux. heat
indoor blower
compressor
power
common
emergency heat
Low Voltage Wiring (with Auxiliary Heat)
SINGLE PHASE
CONTROL WIRE
CONNECTIONS
DEFROST CONTROL
BOARD (CMC1)
CUTOUT FOR HIGH
VOLTAGE CONDUIT
GROUND
HIGH VOLTAGE
CONNECTIONS
(CONTACTOR)
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
GROMMET AND WIRE TIE
FOR CONTROL WIRES
A
B
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