Wiring Diagrams: Multi-Speed Fans - nest Learning Installation & Configuration Manual

Wiring Diagrams: Multi-Speed Fans
2 Speed
Label: Function:
Y1 Compressor Relay (Stage 1)
Y2 Compressor Relay (Stage 2),​ ​
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​ : ​ W3,​ E​ , HUM/DHUM, 3rd-speed fan relay
Rh 24VAC power from heating transformer ‡
3 Speed
Label: Function:
Y1 Compressor Relay (Stage 1)
Y2 Compressor Relay (Stage 2), ​
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 ) / ​
C 24VAC Common Wire †
*
Star​ : ​ W3,​ E​ , HUM/DHUM, ​
Rh 24VAC power from heating transformer ‡
2 nd-speed fan
2 nd-speed fan
A uxiliary Heat Relay
3 rd-speed fan relay
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