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Typical 24VAC Control Wiring Diagrams (Field Installed)
THERMOSTAT
INDOOR UNIT
R
C
W1
Y1
O
G
R
C
W1
W2
W3
G
R
C
W1
Y1
O
COMMON
1ST
‐
STAGE
AUXILIARY
HEAT
INDOOR BLOWER
COMPRESSOR
24V POWER
REVERSING VALVE
COMMON
1ST
‐
STAGE
AUXILIARY
HEAT
24V POWER
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
OUTDOOR UNIT
R
C
W1
Y1
O
G
R
C
W1
W2
W3
G
E
R
C
W1
Y1
O
EMERGENCY
HEAT
EMERGENCY
HEAT RELAY
OUTDOOR
THERMOSTAT
THERMOSTAT
INDOOR UNIT
OUTDOOR UNIT
COMMON
1ST
‐
STAGE
AUXILIARY
HEAT
INDOOR BLOWER
COMPRESSOR
COMMON
1ST
‐
STAGE
AUXILIARY
HEAT
R
E
W
O
P
V
4
2
R
E
W
O
P
V
4
2
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
REVERSING VALVE
WARNING! - ELECTRIC SHOCK HAZARD. Can cause INJURY
or DEATH. Unit must be grounded in accordance with national
and local codes.
NOTE - For use with copper conductors only. Refer to unit rating
plate for minimum circuit ampacity and maximum over
‐
current
protection size.
FIGURE 11. Typical Control Wiring
