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  1. #1
    Join Date
    Jul 2011
    Posts
    28

    compressor issue when charging

    so i am a certified tech and was working on a 10-15 year old payne unit suction pressure was 40 so i added r-22. 8 oz. vapor. unit taking refrigeranty at a very slow rate so i added 8 more oz. in a liquid 4 at a time slowly. this got the suction pressure to about 75 and all of a sudden compressor makes intermittent wierd sounds sending the pressure up and down between 75 and 120. then compressor just stopped working. disconnected power and am hoping i just flooded it and in the morning it will be fine. what do you think???

  2. #2
    Join Date
    May 2010
    Location
    Oxford, UK
    Posts
    336
    Did it go "ngung ngung ngung PATCHEWWW"? and then repeat a few times before it died?

    And then go "HMMMMMM click"?
    Last edited by monkeyspanners; 07-14-2011 at 01:31 PM. Reason: more tech info!

  3. #3
    Join Date
    Feb 2011
    Location
    Georgia
    Posts
    191
    if its recip comp may be the one way valve letting liquid back through

  4. #4
    Join Date
    Sep 2007
    Location
    South Dakota
    Posts
    165
    Quote Originally Posted by monkeyspanners View Post
    Did it go "ngung ngung ngung PATCHEWWW"? and then repeat a few times before it died?

    And then go "HMMMMMM click"?
    Thats good diagnosic info there LOL

    My coworker always tries to imitate sounds-usually he ends up getting mad at us when we make him repeat it about 4 or 5 times.

  5. #5
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    Quote Originally Posted by monkeyspanners View Post
    Did it go "ngung ngung ngung PATCHEWWW"? and then repeat a few times before it died?

    And then go "HMMMMMM click"?


    just thought it beared repeating
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  6. #6
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
    Posts
    7,281
    Quote Originally Posted by monkeyspanners View Post
    Did it go "ngung ngung ngung PATCHEWWW"? and then repeat a few times before it died?

    And then go "HMMMMMM click"?
    Bahahahahaha

  7. #7
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
    Posts
    7,281
    Quote Originally Posted by monkeyspanners View Post
    Did it go "ngung ngung ngung PATCHEWWW"? and then repeat a few times before it died?

    And then go "HMMMMMM click"?
    And why are you not a Pro here???

  8. #8
    Join Date
    Jan 2005
    Location
    southeast
    Posts
    83
    Did you ever check the HIGH side pressure while it was running. There may have been a restriction or a TXV power assembly loosing charge and you were overcharging it causing the head to climb.

  9. #9
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
    Posts
    7,281
    Just remember the DIY thingy here guys

  10. #10
    Join Date
    Jul 2011
    Posts
    28
    as far as sound effects go you nailed it. good description... i take it you may have heard that sound in your day. any idea what that is/ how to avoid repeating? forgot to mention that i went back today and compressor workede and system ran fine.

  11. #11
    Join Date
    Dec 2009
    Location
    northeast pa
    Posts
    118
    Quote Originally Posted by stemps22 View Post
    as far as sound effects go you nailed it. good description... i take it you may have heard that sound in your day. any idea what that is/ how to avoid repeating? forgot to mention that i went back today and compressor workede and system ran fine.
    Let professional charge units. liquid slugging is the term.

  12. #12
    Join Date
    Jul 2011
    Posts
    28
    yeah man i am a pro with more learning to go. (2 years schooling and a little less than a year field experience) thanks for the term information, however i'm curious to know what actually happened. i work for a small company and would like more feedback than the one other tech had to offer thanks

  13. #13
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,659
    Quote Originally Posted by stemps22 View Post
    yeah man i am a pro with more learning to go. (2 years schooling and a little less than a year field experience) thanks for the term information, however i'm curious to know what actually happened. i work for a small company and would like more feedback than the one other tech had to offer thanks
    When you were in school, they taught you about pressure temperature relationship and some measurements that are taken by using BOTH a pressure AND a temperature.

    Go ahead and start using those readings.

    As to what actually happened, you probably over-charged it.

    Hermetic reciprocating compressors are refrigerant cooled, so a little liquid isn't likely to hurt a healthy compressor.

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