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4-wire Heat/Cool System
G
Rh
Fan
Heat/Cool
Cool
Contactor
Relay
24V Supply
5-wire Heat/Cool System
Rc
Rh
G
Fan
Cool
Heat
Relay
24V Supply
24V Supply
27
Y
W
Heat Relay
or Valve
Y
W
Cool
Heat Relay
Contactor
or Valve
