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WIRING DIAGRAMS
5-wire Heat/Cool System
X - No Connection
THERMOSTAT
G
W
Y
RHRC
Heat Relay
or Valve
Heat
24V Supply
Fan
Relay
Cool
Contactor
Cool
24V Supply
THERMOSTAT
G
W
Y
RHRC
Heat/Cool
24V Supply
Fan
Relay
Heat Relay
or Valve
Cool
Contactor
Jumper
4-wire Heat/Cool System
X
O/B
X
O/B