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
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
Thermostat must be set to B on all Heat Pump Systems
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 on the receiver unit should both be tied to the Fan Wire (green).
8
Wiring Diagrams
