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  1. #1
    Join Date
    May 2012
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    32

    suction line cold but box does not reach temp

    Hello,
    So I'm dealing with a reach-in cooler 134a that is not reaching temp lowest it goes is 49, my high side is at 320 and low side at 20, my suction line is cold and sweating. maybe restricted cap tube or drier?
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  2. #2
    Join Date
    Apr 2012
    Location
    Jackson, MS
    Posts
    31
    Did you mean 320psi high side if so on 134a with a 20# suction I would think u are overcharged with a restriction. I've met people who will overcharge to force up suction pressure for temporary fixes that become permanent. You be best to pull the charge purge the system with some nitrogen replace cap and drier and weigh in the name plate charge. You may get lucky and the compressor will make another year.

  3. #3
    Join Date
    May 2012
    Posts
    32
    I removed the cap tube and filter tomorrow I will be installing new ones after I purge the system. if this doesn't work i don't know what else it could be...compressor? I dont under stand how the suction line was so cold and discharge nice and hot box would not go under 48degrees

  4. #4
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    320 head on 134a you have a problem... it won't work.... unplug it or order a new pump
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  5. #5
    Join Date
    Jan 2010
    Posts
    6,056
    [QUOTE=jmo90280;13339301]I removed the cap tube and filter

    Did you seal the system up for overnight ?

  6. #6
    Join Date
    May 2012
    Posts
    32
    I knew I forgot something.. I didnt after took the parts off I headed to the supply house thinking I was going to get the parts today..Newbie mistake ...If I pull a really good vacuum u think i might be ok?

  7. #7
    Join Date
    Apr 2012
    Location
    Jackson, MS
    Posts
    31
    U will need pull the compressor and change the oil its poe oil u will never get the moisture out of that oil u will need to pour it into something and measure it then pour the new oil back in.

  8. #8
    Join Date
    May 2012
    Posts
    32
    I put the oil back in through the discharge right?

  9. #9
    Join Date
    Apr 2012
    Location
    Jackson, MS
    Posts
    31
    The suction

  10. #10
    Join Date
    Apr 2012
    Location
    winnipeg
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    i am not so convinced on this poe and moisture thing..... i have lots run out of refrigerant...new drier evacuation.... charge it up..... send the bill.... everyone happy
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  11. #11
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    Quote Originally Posted by jmo90280 View Post
    I put the oil back in through the discharge right?
    oh man..... I need a beer...lol
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  12. #12
    jpsmith1cm's Avatar
    jpsmith1cm is offline Global Moderator/AOP Committee
    Join Date
    Sep 2008
    Location
    Western PA
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    25,386
    Quote Originally Posted by carmon View Post
    i am not so convinced on this poe and moisture thing..... i have lots run out of refrigerant...new drier evacuation.... charge it up..... send the bill.... everyone happy
    This is why.

    Evacuation will not remove moisture from POE oil, but a proper drier will.

    This assumes that the oil was not left open to the atmosphere for an extended period of time.

    POE oil permanently changes when exposed to moisture.

  13. #13
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    i agree ........ I have a bazillion driers in the truck since poe surfaced
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

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