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  1. #1
    Join Date
    Jan 2007
    Posts
    3

    NEST thermostat question

    Hello there,
    I have a technical question about the new nest t-stat. I have a Honeywell steam humidifier and I would like to buy the new nest thermostat, I was wondering how to wire the humidifier to the new nest t-stat? and I would like to humidified the house even if the heat is not on, also want the humidifier to come on only if the fan is on; Can you please help. I have a PDF file link to my humidifier and to the nest wiring Thank you in advance.
    NB : (OPTION 4: VisionPRO IAQ without Fan Delay) is the way my furnace is wired.

    http://www.nest.com/blog/2012/10/02/...st-thermostat/

    http://www.forwardthinking.honeywell...on/69_2285.pdf

  2. #2
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,380
    The nest is a "dumb thermostat" as far as connectivity and options are concerned. Single stage or Heat pump is all it can do. For a about the same more money you can get an ecobee with the humidity control built in. It has multiple configuration options built in. The ecobee is NOT a DIY install for most people, professional installation recommended.

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,777

  4. #4
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,380
    Here's a quote from the ecobee installation manual

    Humidifier: Select this option when the Thermostat
    is required to control a humidifier. When this option is
    selected you will also be able to configure the following:

    Humidify only while heating If Yes is chosen, the
    system will activate this relay when the current
    humidity is below the humidity set point and there
    is a call for heat.

    If No is chosen the system will activate this relay and
    the system fan when the current humidity is below
    the humidity set point. This is designed to support
    steam type humidifiers.


    Nest has absolutely no humidifier control at all, much less an option of how it's controlled. The only advantage Nest has over ecobee is it's pretty.

  5. #5
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,380
    I totally missed that you already have a Honeywell IAQ, why would you want to downgrade to a Nest?

  6. #6
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    I wasn't aware that it was out yet, but it appears the 2nd generation Nest thermostat is able to control a humidifier.
    It only does a 1 wire connection for humidity control, so a relay will need to be added to operate the humidifier.

    With the Nest, you still can't have both humidifier control and dehumidification control like your IAQ thermostat.
    Last edited by mark beiser; 10-02-2012 at 11:33 PM.
    If more government is the answer, then it's a really stupid question.

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