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Installation Overview - Complex Systems
Duel fuel systems - configuring equipment
If there's an O/B wire and one or more W wires connected to the Nest Learning Thermostat, Pro Setup will ask if
the heating system is dual fuel or single fuel.
For single fuel, any wires inserted into the W1, W2/AUX connectors will be treated as auxiliary heat that will be
used simultaneously with the heat pump when needed. Only one auxiliary heating wire is supported.
For dual fuel, any wires inserted into the W1, W2/AUX connectors will be treated as alternate heat that will be used
instead of the heat pump when needed. Use Pro Setup to indicate the source (gas, electric, geothermal, etc.) as
well as the delivery mechanism (forced air, radiant, etc.) for each of the W wires connected. The Nest Learning
Thermostat supports up to two wires for alternate heat; additional alternate heat wires are not supported.
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Need help?
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.
This answer is automatically generated