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Thread: txv icing

  1. #1
    Join Date
    Sep 2009
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    Northeast
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    txv icing

    is it normal for ice buildup on txvs and distrib. tubes in a freezer application?

  2. #2
    Join Date
    Sep 2009
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    Northeast
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    was this a dumb question?

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
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    25,924
    Yes on both counts.



    Not really.

    Think about it for a couple of minutes and you won't have to ask the question.

    What is your box temp? -10F?

    So, to get a -10 box, you need about a -20 coil. Even with 6 degrees of superheat, you are looking at leaving suction line temps of -14 degrees.

    If there isn't ice on the lines, you've got a problem. Heck, if there isn't ice on the COMPRESSOR you might want to take a look at it.

  4. #4
    Join Date
    May 2008
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    The People's Republic of Massachusetts
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    91
    If you have excessive frosting or ice build up on the inlet of the valve body you may have a plugged strainer. It can't hurt to pump it down and have a look at the strainer.

  5. #5
    Join Date
    Feb 2008
    Location
    California
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    2,071
    This depends...

    If you have ice on the valve and distributor tubes AND you have 6* superheat, your golden.

    If you have ice on the valve and distributor tubes AND you have 30* superheat, you got a problem.

  6. #6
    Join Date
    Jun 2006
    Location
    Omaha, Nebraska
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    869
    Hmmm...I've seen TXVs in freezer evaps that were perfectly dry, and others with 12 inches of ice buildup in the same application. I've never known why some build ice and some don't, but they keep on working so I don't think about it too much.

  7. #7
    Join Date
    Sep 2005
    Location
    florida
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    5,514
    Quote Originally Posted by man from trane View Post
    Hmmm...I've seen TXVs in freezer evaps that were perfectly dry, and others with 12 inches of ice buildup in the same application. I've never known why some build ice and some don't, but they keep on working so I don't think about it too much.
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  8. #8
    Join Date
    May 2008
    Location
    The People's Republic of Massachusetts
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    91
    Also depends on the type of defrost.

    Electric defrost in freezer cases never clear all the frost and ice off the distribution tubes. Bottom line is superheat.

  9. #9
    Join Date
    Jan 2010
    Posts
    5
    The valve should be insulated this will prevent ice on the valve. You will get frost on the distribution pipes.

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