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  1. #1
    Join Date
    Mar 2003
    Location
    austin
    Posts
    255

    High suction, low discharge

    So I just installed a complete Rheem 5 ton, 14ajm series system ast november. HO tells me its not cooling as good. I arrive to find a loud compressor, 200 psi suction and 275 head. First thing that comes to mind is bad valves. A few minutes later the compressor cuts off on internal overload. I take a hose and cool it off. 10 min later, compressor kicks back on and pressures now seem normal (130/325) 13 subcool , 19 delta t. So I let it run for 20 minutes and take off. An hour later , HO called back and outdoor unit has stoppes running again. Bad txv?
    when life throws me a banjo, i play it

  2. #2
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,298
    Why would you leave with a compressor running 225/200 without resolving the issue ?

    Of course its going to trip again.

  3. #3
    Join Date
    Jan 2007
    Location
    in my lumpy chair
    Posts
    1,946
    Overfeed. possible loose bulb or poorly insulated, over sized.
    Suction pressure high, head pressure low, superheat low, subcooling low, amp low.
    I don't see any superheat or subcooling
    I dont warranty Tinkeritus

  4. #4
    Join Date
    Mar 2003
    Location
    austin
    Posts
    255
    Quote Originally Posted by Six View Post
    Why would you leave with a compressor running 225/200 without resolving the issue ?

    Of course its going to trip again.
    I was planning on going back to replace the txv. Just wanted some feedback
    when life throws me a banjo, i play it

  5. #5
    Join Date
    Oct 2010
    Location
    Texas
    Posts
    37
    Is the suction line very cold? If not I would suspect the internal releif valve in the compressor.

  6. #6
    Join Date
    Oct 2010
    Location
    Texas
    Posts
    37
    My above question applies when the unit is malfunctioning. I'm assuming the condenser fan was running? Condenser fan shutting off, when your not there? Check fan amps and the cap.

  7. #7
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,298
    Quote Originally Posted by michigan1 View Post
    I was planning on going back to replace the txv. Just wanted some feedback
    Ah...ok.

    Well someone mentioned a week internal relief that sounds reasonable.

    Even if your txv was wide open you wouldnt be equalizing like that.

    It almost sounds like its a scroll running backwards.

  8. #8
    Join Date
    May 2008
    Location
    Myrtle Creek. Oregon
    Posts
    182
    bad valves or internal releaf open
    a stupid question is a question you wont to ask, but don't

  9. #9
    Join Date
    Oct 2010
    Location
    Texas
    Posts
    37
    If bad valves, it wouldn't have returned to normal pressures.

  10. #10
    Join Date
    Mar 2003
    Location
    austin
    Posts
    255

    Confused

    Quote Originally Posted by tharding54 View Post
    If bad valves, it wouldn't have returned to normal pressures.
    Exactly
    when life throws me a banjo, i play it

  11. #11
    Join Date
    Mar 2003
    Location
    austin
    Posts
    255
    Quote Originally Posted by tharding54 View Post
    Is the suction line very cold? If not I would suspect the internal releif valve in the compressor.
    Ok this makes sense. IRV pops, compressor gets hot, then goes off on internal overload? Ive never had one do that but logical...
    when life throws me a banjo, i play it

  12. #12
    Join Date
    Dec 2010
    Location
    Palm Beach,Fl.
    Posts
    920
    Sounds like a scroll running backwards to me as well. I was working on unit the other day and we had a little power brown out and the neighbors rheem unit started running backwards. I reset the breaker and it started up fine. Maybe they have a bad connection or floatswitch that is causing the unit to short cycle. Install a time delay and check your wiring inside and and out.
    Quote Originally Posted by k-fridge View Post
    The laws of physics know no brand names.

  13. #13
    Join Date
    Mar 2003
    Location
    austin
    Posts
    255
    Quote Originally Posted by SoFlaDave View Post
    Sounds like a scroll running backwards to me as well. I was working on unit the other day and we had a little power brown out and the neighbors rheem unit started running backwards. I reset the breaker and it started up fine. Maybe they have a bad connection or floatswitch that is causing the unit to short cycle. Install a time delay and check your wiring inside and and out.
    Its single phase. You mean its running backwards on overload?
    when life throws me a banjo, i play it

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