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  1. #1

    Default circuit board wired outside air handler

    A friend sent me this photo of a small circuit board (control board?) wired up to thermostat wiring at the attic mounted air handler. Without getting him to take another picture, i was wondering if this is most likely the control board or if it could be something else and whether there is any issue with having it mounted outside the housing. Thank you.

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  2. #2
    Join Date
    Feb 2008
    Location
    Chicago IL
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    Default Re: circuit board wired outside air handler

    Based on unit color, looks like an older Janitrol. That is not the motherboard or anything else that comes with that furnace. My guess is the motherboard died and they didn't want to spend the money on a new one. That's some guys retrofit.

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  3. #3
    Join Date
    Mar 2007
    Location
    Orlando, FL
    Posts
    1,340

    Default Re: circuit board wired outside air handler

    It doesn't belong there, even if it was intended to replace a failed part internally.

    Maybe someone was "part swapping" to find a fix, and didn't finish the job.

    Tell him it's worth a few bucks to have pro check it out and repair it.


  4. #4
    Join Date
    Mar 2007
    Location
    Plano, Texas
    Posts
    4,170

    Default Re: circuit board wired outside air handler

    Look for zoned air dampers and dual thermostats. That is likely the innards of the central control.

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  5. #5

    Default Re: circuit board wired outside air handler

    Thank you for the responses. He told me there was only one thermostat (no separate zones).


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