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Thread: Coil with TXV

  1. #1
    when using a coil with a TXV and your soldering in the coil what should you do with the sensing bulb????? test question

  2. #2
    burn it up.

  3. #3
    Join Date
    Feb 2005
    Location
    Dothan, Al
    Posts
    3,453

    nitro

    Remove it from the line or cover it with a wet cloth.

    Richard

  4. #4
    Join Date
    Jan 2004
    Location
    Midlothian, Virginia
    Posts
    195
    you just did nitro's homework riding
    Goodbyee stranger it's been nice. Hope you find your paradise! Hey it aint rocket science, "It's a Trade !"

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,317
    cut it out of the way.

    Contractor locator map

    How-to-apply-for-Professional

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

  6. #6
    Join Date
    Oct 2005
    Posts
    68
    Wrap it in a wet rag or put it down in a glass of ice water. In other words dont damage it in any way

  7. #7
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    I don't have any facts to back it up, but my gut fealing is that most of the "warranty" TXV failures that happen are due to installers not protecting the TXV sensing bulb when brazing the vapor line onto a coil or air handler that has a built in TXV.
    Most of the coils and air handlers with built in TXVs have the sensing bulb mounted just a few inches away from where you braze the lines on.
    If more government is the answer, then it's a really stupid question.

  8. #8
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    2,793

    most TXVs that come

    Originally posted by mark beiser
    I don't have any facts to back it up,
    with the evap coils are crap anyways (can you say Trane?)
    but even then the sensing bulb is clipped on and very easily moved for brazing

  9. #9
    Join Date
    Apr 2005
    Location
    illinois
    Posts
    257
    What are the signs that a txv has gone bad?

  10. #10
    Join Date
    Nov 2001
    Location
    east kansas
    Posts
    8,033
    Originally posted by heetseeker
    What are the signs that a txv has gone bad?
    Overfeeding, starving, hunting.

    Tip: Save the cut sheet from TXV boxes. They have troubleshooting info and how to adjust them.
    Beware of advice given by some guy on the Internet.

  11. #11
    Join Date
    Apr 2004
    Location
    Bartlett, IL
    Posts
    6,619
    If I sell a job with a TXV, I sell the TXV cased coil.

    It's already installed.

  12. #12
    Join Date
    Apr 2005
    Location
    illinois
    Posts
    257
    Thanks for ypur reply but I do not know how hunting, overfeeding or starving manifest themselves. What would happen with these problems?

  13. #13
    Join Date
    Nov 2001
    Location
    east kansas
    Posts
    8,033
    Starving looks like the unit is short refrigerant, but your subcooling is mormal to high.

    Overfeeding your superheat is very low and compressor may be sweeting.

    Hunting is where your superheat never stabalizes.
    Beware of advice given by some guy on the Internet.

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