C
R
L1
L2
COMPRESSOR
RELAY
CHANGEOVER VALVE
FAN LOW RELAY
FAN HIGH RELAY
1
3
C
R
L1
L2
COMPRESSOR
RELAY
CHANGEOVER VALVE
FAN LOW RELAY
FAN HIGH RELAY
1
B
3
EMERGENCY
HEAT RELAY
R
Y
W
C
GL
GH
B
R
Y
W
C
GL
GH
CHANGEOVER VALVE
O
O
CHANGEOVER VALVE
Typical 1H/1C Heat Pump System: 2 Speed Fan
Typical 2H/1C Heat Pump System: 2 Speed Fan
1
2
3
Power supply
Cap off W
Terminal B or O is used on Heat Pump Systems;
B is energized in heating, O is energized in cooling.
2
Note:
Most PTAC systems support two speed fan operation. In a single speed
fan PTAC system or conventional single speed fan system, the GL and GH
wires should both be tied to the Fan Wire (green).
10
Wiring Diagrams
Summary of Contents for 6041228
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