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Heat Pumps
1-stage heat pump
Wire Label
Y1
Compressor Relay (Stage 1)
Y2
G
Fan Relay
O/B
Heat Pump Changeover Valve
Rc
24VAC Power from Cooling
Transformer
W1
W2/AUX
C
24VAC Common Wire
*
Rh
AQ+
AQ-
Install Notes: Use for personal/or system notes
Function
Wiring Diagrams - 1-Stage Heat Pump
56
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Do you have a question about the Nest Learning Thermostat 4th Gen and is the answer not in the manual?
Questions and answers
Where is the 4th generation wiring guide
The wiring guide for the Google Nest Learning Thermostat (4th Gen) can be found in its manual.
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