Single-stage Heat Pump
THERMOSTAT
G
W
Y
O/B
RH
RC
Heat Pump
24V Supply
Fan
Relay
Compressor
Contactor
Reversing
Valve
Jumper
X - No Connection
O/B
2-wire Heat Only
THERMOSTAT
G
W
Y
RH
RC
Heat Relay
or Valve
Heat
24V Supply
X
X
X
X
X
B99A p30-40 2/7/03 9:59 AM Page 8