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  1. #1
    Join Date
    May 2009
    Lawrence, Kansas

    2 Stage AC wiring question and quandry.

    I think this question falls outside the DIY rules, if not and it needs to be deleted no offense will be taken.

    A new system was put in a month or so ago, model numbers/details are...
    Furn. AMV90905DX (2 stage/variable speed)
    AC. ASX160361 (2 stage)
    A new coil and fan powered humidifier was also installed
    Thermostat is IAQ Vision Pro (first one the have installed)

    The question has to deal with the wiring from the AC unit to the furnace. From all appearances it looks like the wiring for the previous single stage AC unit was left in place, and in turn no wiring to the YLO post on either the IAQ board or the furnance logic board is in place

    Now everything does run, however what I'm not sure of is if this setup allows the AC unit to really function as a 2 stage unit or is it just Stage 1 or Stage 2 all the time.

    I've tried to keep this short so it is entirely possible more info is needed for advice on whether to phone my installer for yet another time to finish things off properly.


  2. #2
    Join Date
    Jan 2004
    Call your contractor back.
    Tell them you want it wired to work the way it should, and the way you paid for.
    Contractor locator map


    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Sep 2002
    Northeast Ohio
    Sounds like they short cutted a tad. Like BT says, call them back out so you can realize the benefits of the system you paid for.
    A good HVAC tech knows how, an educated HVAC tech knows why!


  4. #4
    Join Date
    May 2009
    Lawrence, Kansas
    Thanks for the quick responses.

    I guess the worst part of this is, having lived in Lawrence for 32 years I thought I knew which were the good guys and bad guys, and I thought I had picked one of the ones that would do most everything right on the first try, and alas this will make call #4 to take care of installation short cuts.

    Tiz truly annoying.

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