1st Stage Cool
1st Stage
Heat
Thermostat
RC
RH
G
W/E
Emerg./AUX
Heating
2nd Stage
Heat
2nd Stage Cool
Y
C
Y2 O/B/W2
Single Stage / Two Stage Heat Pump with Emergency Heat and Auxiliary
Heat with C wire
Thermostat
G
W/E
Y
C
Y2 O/B/W2
Single Stage Cool / Two Stage Cool‒Air conditioner
RC
RH
12