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  1. #1
    Join Date
    Sep 2011
    Posts
    58

    High pressure problem

    Troubleshhoting a 10 to r22 system w reset switch, upon resetting it the pump turn on and high side hits 400psi in a few seconds then shuts off..

    When it shuts off the txv valve makes a strong humming noise for a few seconds then stops... Could this be a bad txv?

  2. #2
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,121
    Quote Originally Posted by myhvacx View Post
    Troubleshhoting a 10 to r22 system w reset switch.
    What is a 10 to R22 system?
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  3. #3
    Join Date
    Aug 2012
    Location
    Vancouver Island, British Columbia
    Posts
    16
    woops looks like im being a parrot

  4. #4
    Join Date
    Aug 2012
    Posts
    2,742
    I think he meant 10 ton r22 system.
    Sounds like a ristriction of the collosal{big} type.

  5. #5
    Join Date
    Aug 2012
    Location
    Vancouver Island, British Columbia
    Posts
    16
    think he means 10 ton maybe. if you think it is the tx put the bulb in some warm water and see if that makes a difference. check for any visible kinks in line, possible plugged filter drier? how many "seconds" does it take

  6. #6
    Join Date
    Sep 2011
    Posts
    58
    Five seconds , yes i meant 10 ton

  7. #7
    Join Date
    Jun 2012
    Location
    Northeast
    Posts
    305
    it can't be the TXV. You would get more then 5 seconds of run time. And it would need to be overcharged, the unit should pump down and trip the low pressure before it trips the HP switch. Is it a tin can or semihermetic? Where is the pressure switch? Are there any service valves on the dischargre line that can be partially closed? What is the history of the equipment?

  8. #8
    Join Date
    Sep 2011
    Posts
    58
    Just put the bulb in warm water, no difference..

  9. #9
    Join Date
    Sep 2011
    Posts
    58
    Name:  ImageUploadedByTapatalk1348686968.641118.jpg
Views: 500
Size:  23.6 KB
    Reciprocating compressor, the compressor is about 3 months old, the air h is about 3 years old, there's a pic, hope it uploads.. The system may have been overcharged from what i understand about 2 weeks ago..
    Standing high side reads 200psi.

  10. #10
    Join Date
    Nov 2005
    Location
    Texas
    Posts
    1,633
    Quote Originally Posted by myhvacx View Post
    Name:  ImageUploadedByTapatalk1348686968.641118.jpg
Views: 500
Size:  23.6 KB
    Reciprocating compressor, the compressor is about 3 months old, the air h is about 3 years old, there's a pic, hope it uploads.. The system may have been overcharged from what i understand about 2 weeks ago..
    Standing high side reads 200psi.
    Unless it is 100° where you are, that 200psi standing points to non-condensables......Just a thought.

  11. #11
    Join Date
    Jul 2008
    Location
    Mid Michigan
    Posts
    319
    Quote Originally Posted by gonefishing View Post
    Unless it is 100° where you are, that 200psi standing points to non-condensables......Just a thought.
    Exactly what I was thinking.
    Waddya mean don't thaw out the frig with a knive?

  12. #12
    Join Date
    Sep 2011
    Posts
    58
    Im sry, scroll not recip..

  13. #13
    Join Date
    Sep 2012
    Location
    Hebderson Ky
    Posts
    55
    If there has been a compressor change on the unit I have seen the needle in the txv black and dirty from the torching/old compressor burn out. Especially when brazing without nitrogen.

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