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Thread: Wiring issue

  1. #1
    Join Date
    Oct 2005
    Posts
    5
    I just had a Trane XL16I heat pump installed with a XV80 FAU. Right now, the heat pump does not heat the house, but the FAU works on emergency heat. (like i want it to) I noticed a couple of anomilies with the (trane) thermostat wiring. 1) B is not connected to the transformer common on the FAU and thus the thermostat runs constantly on battery power. 2) Y2 is going to BK/Twin on the FAU and then to the heat pump. Its to dark right now to see the wires outside. 3) W1 goes directly to the heat pump as does Y1 and O. Y1 is also connected to Y at the FAU. 4) X2 goes to W1/W2 on the FAU which seems right for emergency heat. Let me know what can/should be moved and a posible wire map for the heat pump as well


  2. #2


    You paid for a working system, did you not?

    Please call the installing HVAC Company and tell them about your concerns. They can't address and correct issues that may be valid if you do not contact them.

    They should be your FIRST contact, if any problems may happen to arise. Otherwise, you picked the wrong company.

    (we can't help DIY, due to site rules )

  3. #3
    Join Date
    Oct 2005
    Posts
    5
    Wiring was cool (except for the common on the Thermostat, got that fixed). The problem may be a bad valve on the compressor. When the heat pump kicks in that return drops to below 50 psi even when the A/C is to spec on both supply and return. The tech is coming out to look at it tomorrow with the help of Trane tech support.

  4. #4
    Join Date
    Oct 2005
    Posts
    68
    sounds like the company you picked isn't familiar with their product if they have to have tech support ride along already

  5. #5
    Join Date
    Oct 2005
    Posts
    5
    tech support has to authorize the warrenty repair. At least that is what I am told.

  6. #6
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    Wouldn't be surprised if tech support would want to have a look at it if the compressor is hooped. If I had a new install with a toasted compressor I would be calling in the manufacturer as well.
    "Go big or Go Home"

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