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Installation Overview - Complex Systems
Duel fuel systems - Activating alternate heat and advanced settings
Unlike auxiliary heat, which may run simultaneously with the heat pump heating, dual fuel systems always run
alternate heat independently from heat pump heating. The settings available to activate alternate heat are either
based on temperature or time. You will need to decide if alternate heat should always be used for heating, never
used for heating, or activated when the outdoor temperature is below the "Breakpoint temperature." You will
configure the breakpoint temperature unless you choose "Never" or "Always."There is also an additional option
for "Alternate heat changeover time" available only during the Pro Setup process. This setting will allow you to
choose the maximum amount of time the heat pump will run in a heating cycle without achieving the target
temperature before switching over to alternate heat. You will need to select "Use custom heat pump settings"
when prompted in order to set the "Alternate Heat changeover time."
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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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