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Thread: TXV issue?

  1. #14
    Hmmmm good point it may be over charged then

  2. #15
    Join Date
    Jul 2013
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    The thermal bulb itself is not position sensitive in relation to its process tube.
    You can put the bulb in incorrect spots. It will make the valve erratic but not shut down. The liquid in the bulb is not going to go down the tube like you're thinking. You've got something else going on there. Unless it took awhile for the person to call in, sounds like it could be airflow.

  3. #16
    Unless it was cycling off on low pressure. The switches are in series. I never confirmed which switch was doing it - low or high

  4. #17
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    Jul 2013
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    A unit will not ice up when it's over charged.

  5. #18
    Join Date
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    Quote Originally Posted by bjonesplumb View Post
    Unless it was cycling off on low pressure. The switches are in series. I never confirmed which switch was doing it - low or high
    More likely it was cycling off the low pressure switch.
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  6. #19
    That's what I thought I never saw an ice up problem with overcharge. If its still going to do it I am thinking it could be air flow. It is a mobile home furnace and I'm not thrilled with the louvered door return it seems insufficient

  7. #20
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    Jul 2013
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    I wonder if they were slick and changed the filter before you got there. Check the trash can? Haha.

  8. #21
    Join Date
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    What were your pressure readings as it was short cycling? That should tell you if it was from high or low pressure cut out.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  9. #22
    I didn't take pressure readings while it was doing that. As soon as I got there I shut the system down to let everything defrost.

  10. #23
    To get back to the beginning, are we all in agreement that this ice up issue could be caused by the txv bulb being mounted upside down?

  11. #24
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    Quote Originally Posted by bjonesplumb View Post
    To get back to the beginning, are we all in agreement that this ice up issue could be caused by the txv bulb being mounted upside down?
    A chance. How long was it installed like that? If for a long time, then probably not. May be a much better chance that it is from an air low issue.
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  12. #25
    A couple weeks

  13. #26
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    Quote Originally Posted by bjonesplumb View Post
    A couple weeks
    While possible it was the bulb orientation. I would guess that it was/is an air flow issue. Someone may have set the stat to a low temp to get a far room cooler. And it froze over night while it was cooler outside.
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