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Thread: Nest 2.0 and Aprilaire 600?

  1. #1
    Junior Member

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    Nest 2.0 and Aprilaire 600?

    Nest 2.0 and Aprilaire 600

    I just upgraded from a standard programmable thermostat to a Nest 2.0 Nest Learning Thermostat, 3rd Generation, Works with Amazon Alexa
    My house also has an Aprilaire 600 whole house humidifier. It has an external sensor connected to a manual controller mounted on the furnance.



    The humidifier has 3 sets of wires connected to it. One pair which goes to the external sensor. A pair that connects to the 24V feed from the furnace when the blower is on and a final pair which feeds the solenoid controlling water flow.

    My question is can this humidifier can be connected to the Nest for better control? If so, could someone explain how to connect the wires.
    I read that typically the Nest would only have one wire connected to the '*' for controlling humidifiers.

    Any information you could provide, would be very much appreciated.




    Update amazon now offers a free smart home consultation

  2. #2
    HVAC Thermostat Specialist

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    Here is a wiring diagram. You need a Industrial Grade 6AZU2 Enclosed Fan Relay, SPNO, 24V for it to work properly. I do NOT recommend connecting the humidifier to the hvac 24V power. Follow the diagram and it will work.Nest humidifier wiring diagram with relay

  3. #3
    Junior Member

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    Thank you for the reply and the diagram.

    Am I correct that once wired like the above, the manual controller currently used with the Aprilaire, is no longer used or connected?
    Likewise, given the ability of the Industrial Grade 6AZU2 Enclosed Fan Relay, SPNO, 24V to know outside temperature and the humidity in the house, the external sensor is also no longer required?


  4. #4
    HVAC Thermostat Specialist

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    you are correct with both assumptions

  5. #5
    Junior Member

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    Quote Originally Posted by hvactechfw View Post
    Here is a wiring diagram. You need a relay for it to work properly. I do NOT recommend connecting the humidifier to the hvac 24V power. Follow the diagram and it will work.Nest humidifier wiring diagram with relay

    Where do you buy the relay and where do you wire it? Near the thermostat or near the humidifier?

  6. #6
    Junior Member

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    I found the 6AZU2 Relay at Amazon. I'm sure there are other locations that carry it. It wouldn't matter where you connected it but would be easier if connected near the humidifer given the other wires needed.


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