How Do You Configure Special Systems - nest Learning thermostat Installation And Configuration Manual

throughout the home). Depending on the wire configuration, the Source or Delivery settings may have only
one default option.
Source options include:
•
Gas
•
Electric
•
Oil
•
Propane (LP)
•
Geothermal
Delivery options include:
•
Forced air
•
In-floor radiant
•
Radiators
It's recommended that all connectors highlighted in yellow be reviewed to ensure that the options chosen
are right for that system. However, you can turn the ring and select DONE at any time to exit Pro Setup
without making any changes.

How do you configure special systems?

Below are examples of how to configure a Nest Learning Thermostat to control some of the more complex
heating and cooling systems.
Dual Fuel Systems
If the wires include an O/B wire and one or more W wires (which
indicate that the system uses a heat pump with an additional
heating source) Pro Setup will first ask if the heating system is
dual fuel or single fuel.
For single fuel, any wires inserted into the W1, W2/AUX, or * (if
W3 is chosen) connectors will be treated as auxiliary heat that
will be used simultaneously with the heat pump when needed.
Pro Setup will automatically configure the auxiliary heat wire
for an electric forced air system. The 2nd generation Nest
Learning Thermostat can only support one wire for auxiliary heat;
additional auxiliary heat wires are not supported by Nest.
For dual fuel, any wires inserted into the W1, W2/AUX, or * (if W3 is
chosen) 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 2nd generation Nest Learning Thermostat supports two wires for alternate heat; additional alternate
heat wires are not supported.
Nest Learning Thermostat installation & configuration guide Page 19