Wiring Diagrams: Humidifiers And Dehumidifiers - nest Learning Installation & Configuration Manual

Wiring Diagrams: Humidifiers/Dehumidifiers
Label: Function:
Y1 Compressor Relay (Stage 1)
Y2 Compressor Relay (Stage 2),​ ​ 2 nd-speed fan
relay
G Fan Relay*
O/B Heat Pump Changeover Valve
Rc 24VAC power from cooling transformer
W1 Heat Relay (Stage 1)
W2/AUX Heat Relay (Stage 2 ) / Auxiliary Heat Relay
C 24VAC Common Wire †
*
Star: ​ W 3,​ E​ , ​
Rh 24VAC power from heating transformer ‡
H UM/DHUM​ , 3rd-speed fan relay
18