nest Learning - Wiring Diagrams: Humidifiers and Dehumidifiers

Wiring Diagrams: Humidifiers/Dehumidifiers
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Label:
Function:
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Y1
Compressor Relay (Stage 1)
Y2
Compressor Relay (Stage 2), 2nd-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: W3, E, HUM/DHUM, 3rd-speed fan relay
Rh
24VAC power from heating transformer ‡
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