The nest thermostat is compatible with these systems and supports up to 2 alternate heat sources. Use the wiring diagram you got from the compatibility checker in step 4 to connect your system wires to the nest thermostat.

Al 2257 Wiring Diagram Heat Pump Thermostat 2 Download Diagram
Nest wiring diagram for heat pump. If you have an r rc or rh wire. The color of wire r is usually red and c is black. These two connections will ensure that there is power to the thermostat that you are operating. Heat pump thermostat wiring a typical wire color and terminal diagram. The nest thermostat works great with a heat pump set up but its important to understand the heat pump wiring diagram for the nest thermostat. Nest wiring diagram with heat pump nest 3 wiring diagram heat pump nest e wiring diagram heat pump nest wiring diagram with heat pump technology creates a better life and its true.
As shown in the diagram you will need to power up the thermostat and the 24v ac power is connected to the r and c terminals. Then you likely have a heat pump. Sophisticated gadgets and apparatus even come to enhance your house with technology one of which will be nest thermostat. C is known as the common terminal. 3rd generation nest wiring diagram 3rd generation nest wiring diagram nest 3rd generation wiring diagram heat pump nest 3rd generation wiring diagram s plan technology creates a better life and it is true. Heat pump thermostat wiring chart diagram.
This way you have a reference. If theres a white wire in the connector labeled both w and ob. Heat pumps look similar to air conditioners so check the label on your outdoor unit to make sure its a heat pump. Sophisticated gadgets and gadgets also come to enhance your house using. It corresponds to the chart below to explain the thermostat terminal functions. Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires.
The basic heat pump wiring for a heat pump thermostat is illustrated here. You have a dual fuel system if you have a furnace inside of your home and a heat pump on the outside of your home. Wiring a nest for heat pump operation is different. Put this wire in the nest thermostats ob connector.