11
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
T1
T2
L1
L2
L1
L2
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.
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
