Whirlpool W4GH8 Installation Instructions Manual page 11

4. Connect ground wire to ground lug.
A
B
A. Ground lug
B. Field supply ground wire
C. 208/230 volt field supply wires
5. Connect low voltage circuit.
T2 T1
L2 L1
L2 L1
C
Typical Wiring Connection (low voltage circuit)
Without Auxiliary Heat
Thermostat Indoor Unit
Power
A
R
C
1st Stage
W1
Aux. Heat
Indoor Blower
G
Reversing Valve
O
Y1
Compressor
Y2
With Auxiliary Heat
Thermostat Indoor Unit
A
Power
R
C
Emergency Heat
E
1st Stage
W1
Aux. Heat
Indoor Blower
G
Reversing Valve
O
Y1
Compressor
Y2
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.
6. Replace control box cover.
7. Reconnect power.
Outdoor Unit
Power
R R
Common
C
C
1st Stage
W1
W1
Aux. Heat
W2
W3
If Applicable
G
O
Y1
Y1
Y2
Y2
Outdoor Unit
Power
R R
Common
C C
Emergency
Heat Relay
Outdoor
Thermostat
W1 W1
1st Stage Aux. Heat
W2
W3
If Applicable
G
O
Y1
Y1
Y2 Y2
B
B
11