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  1. #1
    Administrator
    Join Date
    Feb 2012
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    205

    Nest thermostat wiring

    The Nest thermostat has press connectors for the thermostat wiring connections. The press connectors are designed for only one wire each. If your existing thermostat had a jumper between RC and RH do not install a jumper between the RC and RH terminals on your Nest thermostat. The Nest thermostat automatically internally connects the RC and RH terminals if needed. Below are typical Nest thermostat wiring diagrams for air conditioning and heat pump HVAC systems. The wiring colors shown below are typical. Your thermostat wiring colors may not be the same color.





    Typical Nest thermostat wiring diagram for a 1 cool 1 heat HVAC unit

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    Typical Nest thermostat wiring diagram for a heat pump unit
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  2. #2
    HVAC Thermostat Specialist
    Join Date
    Jul 2012
    Location
    Oklahoma City
    Posts
    361
    How does Nest call for AUX heat when it gets too cold for heat pump to keep up?

  3. #3
    Moderator - HVAC Thermostat Specialist
    Join Date
    Feb 2012
    Location
    NE Indiana
    Posts
    631
    it calls for aux heat the same way a standard HP thermostat does which is staging differential.

  4. #4
    HVAC Thermostat Specialist
    Join Date
    Jul 2012
    Location
    Oklahoma City
    Posts
    361
    Does the Nest not use the W1 to call for AUX heat like a conventional stat?

  5. #5
    Administrator
    Join Date
    Feb 2012
    Posts
    205
    I will try to come up with a way to update the heat pump diagram. The unique thing about the Neat is that it can sense if there is a wire connected to W1 or Aux and determin which terminal to entergize for back up heat.

  6. #6
    HVAC Thermostat Specialist
    Join Date
    Jul 2012
    Location
    Oklahoma City
    Posts
    361
    Does the Nest have a way to "lock out" AUX heat above a certain temperature like most high end stats? How about locking out Condenser below a certain temp?

 

 

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