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4. Connect ground wire to ground lug. 5. Connect low voltage circuit.
Typical Wiring Connection (low voltage circuit)
6. Replace control box cover.
7. Reconnect power.
A. Ground lug
B. Field supply ground wire
C. 208/230 volt field supply wires
T1T2
L1L2
L1L2
C
A
B
A. Do not connect C (common) connection between indoor unit and
thermostat except when required by the indoor thermostat. Refer
to the thermostat installation instructions.
B. C (common) connection between indoor unit and outdoor unit
required for proper operation.
NOTE: Some connections may not apply.
Refer to specific thermostat and indoor unit.
Without Auxiliary Heat
With Auxiliary Heat
Power
Indoor Unit
Thermostat
1st Stage
Aux. Heat
Indoor Blower
Reversing Valve
R
W1
G
O
R
C
G
Outdoor Unit
C
Y1
R
W1
O
C
Y1
Power
Common
1st Stage
Aux. Heat
W1
W2
W3
Y2
Compressor
Y2
Y1
Y2
If Applicable
Power
Indoor Unit
Thermostat
1st Stage
Aux. Heat
R R
C
Outdoor Unit
C
R
W1
C
Common
1st Stage Aux. Heat
Indoor Blower
Reversing Valve
G
O
G
Y1
Compressor
O
Y1
W1
W2
W3
W1
E
Emergency Heat
Emergency
Heat Relay
Outdoor
Thermostat
Y2
Y2
Y1
Y2
If Applicable
Power
A
B
A
B