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  1. #1
    Join Date
    Oct 2009
    Posts
    7

    Heat Pump Humidity

    Has anyone heard of a TXV on a Trane XE1000, or any heat pump for that matter, not working properly and either cuasing humidity or interferring with dehumidification?

    Has anyone heard of "tech discovered" technique of taking the bulb end of the TXV out from inside the unit and mounting on the suction line underneath the insulation? (No insulation between the txv bulb and the cold suction line pipe either)

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,613
    The TXV affects metering of the refrigerant in heating mode. No affect on humidity.

    There should be no insulation between the bulb and the copper. Wouldn't hurt to wrap the bulb and pipe with insulation but rarely done.

  3. #3
    Join Date
    Oct 2009
    Posts
    7

    Mobile TXV Bulb

    Any idea what would be the point of taking the txv bulb from inside the unit and placing it outside the unit on the suction line?

    In this case I was told that the coil on the inside air handler was dry and it was not suppose to be. That placing the TXV bulb outside the air handler in a new location would fix that problem.

    If this bulb is to blame is it letting too much Freon get in? or not enough Freon getting in?

    There was mention about moving the bulb to a warmer spot, Does that restrict the amount of freeon? or increases the flow? Why would the suction line be considered a "warmer" spot?

    The txv bulb normally sits on the internal part of the suction line does it not?

  4. #4
    Join Date
    Jul 2008
    Location
    Denver, CO
    Posts
    4,229
    The bulb senses the temperature of the suction line and opens or closes the expansion valve as needed to maintain proper superheat. Moveing the bulb outside the case is just a band aid. If the superheat is off because the TXV is not metering properly the valve should be adjusted to maintain the appropriate superheat or replaced. The only possible thing that moveing the bulb ouside the case would do is cause the TXV to throttle shut a little bit due to the warmer ambiant air surrounding the bulb (even though it's insulated) and allow less refrigerant into the coil.

  5. #5
    Join Date
    Sep 2007
    Location
    NC Coast
    Posts
    2,604
    Bald Louie said it. if the TRANE XE1000 heat pumps is what your questioming.... THAT txv is for heating only. If the Air Handler is a TWExxx(size)C then it is a piston air handler (unless modified) and a TWExxxE then a variable speed air handler and it has a TXV which controls cooling. Air conditioning removed Humidity.... unless it doesnt run long enough. If its not cooling its not removing humidity.... You need to find another company if your not satisfied with your current company.
    I have only moved the bulb on an airhandler TXV when the txv was bad and that was to try and milk out some cooling until we could return to replace the TXV.

    Call another company out!
    Silent Service........ Death From Below!

    Somewhere in Kansas, a town found a village idiot!

  6. #6
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,613
    What is the model # of the air handler? The common ones for the XE1000 would not have a TXV.

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