3-wire Cool Only
3-wire Heat Only THERMOSTAT
W
RHRC
Heat Relay
or Valve
Heat
24V Supply Fan
Relay
THERMOSTAT
G
W
Y
RHRC
Cool
Contactor
Fan
Relay
Cool
24V Supply
G Y
O/B
O/B
38
WIRING DIAGRAMS
X - No Connection
XXX
X X X
Jumper