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Page 23
2-wire Heat Only
3-wire Cool Only
3-wire Heat Only
THERMOSTAT
G
W
Y
RHRC
Heat Relay
or Valve
Heat
Transformer
THERMOSTAT
G
W
Y
RHRC
Heat Relay
or Valve
Heat
Transformer
Fan
Relay
THERMOSTAT
G
W
Y
RHRC
Cool
Contactor
Fan
Relay
Cool
Transformer
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