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  1. #1
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    Nov 2019
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    10 ton trane package unit

    Hello everyone, My name is Terry, I'v been a tech for a couple years now, nice to meet everyone.

    I was needing some help with a trane 10 ton heat pump package unit I'm working on Model WSC120E. The unit has proper charge and runs great in cool mode no problems there, when the unit is switched into heat mode my second circuit pulls a vacuum on the low side and trips the low pressure cutout, it also freezes after the txv and distributing lines leading into the outdoor coil. While it is frozen up I tried to put the sensing bulb in hot water to open up the valve and but it stays frozen do I have a bad txv or is there something else I should be checking, thanks ahead of time for and advice.

  2. #2
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    Jan 2012
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    Sounds like a txv issue to me. Get your post count up and apply for Pro membership, it’s free and you get lots of good training info.

  3. Likes CEAS-AC-TECH liked this post
  4. #3
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    Nov 2006
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    Did you confirm the charge is correct while in cooling mode?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
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  5. #4
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    Nov 2019
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    Thread Starter
    Yes the charge is correct in cooling mode, checked with subcooling charging curve chart from the unit manual.

  6. #5
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    In that case I would probably agree with ksefan.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

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  7. #6
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    Nov 2006
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    Full disclosure: I haven't touched a Trane heat pump RTU in probably 11 or 12 years.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

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  8. #7
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    Sep 2007
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    edmonds wa
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    Is that a danfoss valve brazed onto the dist body and the real skinny cap tube line to bulb?
    UA Local 32 retired as of Jan 2020

  9. #8
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    Nov 2019
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    Thread Starter
    It doesn't say Danfoss on the powerhead but when I type in its number online a Danfoss page is one of the first that shows up, it does have a very small line to the bulb the line doesn't appear to be kinked or damaged, same for the bulb. It also has an external equalization line.

  10. #9
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    Nov 2019
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    Thread Starter
    Hello everyone, just so this might be of some help to people in the future I wanted to give this thread a resolution. I replaced the TXV and the unit runs great now in cool and heat mode, also replaced the dryer. Thanks again to everyone for the help.

  11. #10
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    Nov 2006
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    Thanks for the closure....we appreciate it.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

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