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Original Poster:
Jaron Chong
Hi there, installing a Nest Thermostat (Google Nest Wi-Fi Smart Thermostat, 2020, Snow)
HVAC is a Thermostat + Heat Exchanger setup (two different controls).
== Thermostat (5-wire)
R: Red wire
C: Black wire
O/B: --empty-- (Handled by manual toggle switch)
W: White wire
Y: Orange wire
G: Green wire
== Heat Exchanger (3-wire)
R: Red wire
G: Black wire
Y: White wire
Photos attached. Any recommendations on custom wiring? Do any of the wires in the heat exchanger have to find their way to the Nest?
Thank you!
