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Conventional 1-stage heating, 1-stage cooling
Wire Label
Y1
Compressor Relay (Stage 1)
Y2
G
Fan Relay
O/B
Rc
24VAC Power from Cooling
Transformer
W1
Heat Relay (Stage 1)
W2/AUX
C
24VAC Common Wire
*
Rh
AQ+
AQ-
Install Notes: Use for personal/or system notes
Wiring Diagrams - Conventional 1-Stage Heating, 1-Stage Cooling
Function
51
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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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