30
GRc Rh W
Y
Fan
Relay Heat/Cool
24V Supply
Cool
Contactor Heat Relay
or Valve
X
Jumper
4-wire Heat/Cool System
GRc Rh
Fan
Relay Heat
24V Supply
W
Heat Relay
or Valve
Y
Cool
Contactor
5-wire Heat/Cool System
Cool
24V Supply