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Terminal definition
L
C/X
G
Y
Y2
W
W2/E
W3/0/B
RH
RC
No use
24VAC common for control circuit and thermostat power input
Fan
1
st
stage cooling
2
nd
stage cooling
1
st
stage heating
2
nd
stage heating
3
rd
stage heating
24VAC Power supply for Heating side
24VAC Power supply for Cooling side
RC
RH
W3/0/B
W2/E
W
Y2
G
C/X
L
Y
Terminal
Conventional Heat Cool system
Heat Pump System
1
st
stage compressor
2
nd
stage compressor
Auxiliary heating
Emergency heating
Changeover valve
System monitor
Fan
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