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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
    16,000
    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
    Posts
    2,663
    I think he meant 10 ton r22 system.
    Sounds like a ristriction of the collosal{big} type.

  4. #4
    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

  5. #5
    Join Date
    Aug 2012
    Location
    Vancouver Island, British Columbia
    Posts
    16
    woops looks like im being a parrot

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

  7. #7
    Join Date
    Jun 2012
    Location
    Northeast
    Posts
    275
    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: 483
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
    Sep 2011
    Posts
    58
    Im sry, scroll not recip..

  11. #11
    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.

  12. #12
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Fans on? Plastic bag wrapped around cond? Split coils? If fans on and coils clean start pulling charge. Agree with push it on the restriction thing

  13. #13
    Join Date
    Aug 2012
    Location
    North Dakota
    Posts
    518
    what was the old comps. problem ??? contamanents ,no nitro purge, heavy braze,didnt replace drier ,didnt add temp suct. drier ?????

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