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  1. #14
    Join Date
    Sep 2011
    Posts
    85
    RLA 20A
    LRA 120A

  2. #15
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,350
    Thats what happens when you run twice the correct charge with a dirty evap!
    Make your expertise uniquely valuable.

    Make your influence uniquely far-reaching.

  3. #16
    Join Date
    Jul 2012
    Location
    Dillwyn, VA
    Posts
    43
    If its pulling high amps then condemn the compressor

  4. #17
    Join Date
    Jul 2012
    Location
    Dillwyn, VA
    Posts
    43
    Its a matter of time before it fails

  5. #18
    Check your volts when running? Bad contacor breaker disconnect? Tighten all connections check voltage drops across them and temps..

  6. #19
    Join Date
    Jan 2010
    Location
    Oklahoma City
    Posts
    170
    Quote Originally Posted by jimj View Post
    My guess would be the bearing are going bye bye. 30 amps on a 5 ton 3 phase compressor? Not long for this world!
    What he said. I had one start at normal amps then climb as it ran until it tripped. Boss thought I was crazy changing compressor but had no other ideas, then was happy when it fixed the issue.

  7. #20
    Join Date
    Jul 2012
    Location
    Southwest
    Posts
    114
    It could be oil return. If you dont draw the oil back your amps will rise as it runs. It may start normal then rise up. I would be thinking that route.
    I have heard some will mix in some POE to help draw mineral back?

  8. #21
    Join Date
    Mar 2012
    Location
    New Hampshire
    Posts
    84
    I had a 5 ton Goodman with roughly the same issue the other day. It turned out to be a clogged filter drier in the bottom of the condenser, had to go all "Heels to Jesus" to swap it out. Not fun.

  9. #22
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,146
    Ok, when you say discharge pressure, does that really mean liquid pressure?

    Is there a internal filter drier in that cond unit?

    If you are really measuring discharge pressure I think your going to need a new compressor.

  10. #23
    Join Date
    Jul 2012
    Location
    NE KS
    Posts
    41
    I would verify you are not running backwards. Copeland has had a rash of compressors wired backwards from their labeling on the electrical housing. I recently found out the hard way.

  11. #24
    Join Date
    Sep 2011
    Posts
    85
    How much different is discharge pressure from liquid line pressure?

    P.s. changed the compressor and all is well

  12. #25
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    449
    Quote Originally Posted by B1978 View Post
    It could be oil return. If you dont draw the oil back your amps will rise as it runs. It may start normal then rise up. I would be thinking that route.
    I have heard some will mix in some POE to help draw mineral back?
    B1978 I think that you are on to something here. A scroll compressors life depends on oil and is not forgiving if it lack oil return. The symptoms here are very clear that that scrolls are locking up. A very common cause happens when that scrolls lack oil and grind on themselves. Once this happens its over and the problem only gets worse when you have fine metal fragments floating around. If this is the problem then the only solution is to R/R the compressor.

    The interesting part however is preventing the next failure, Many recommend the installation of an over sized Suction dryer, due to the fact that a standard 16 Cubic dryer will not pick up this fine particles in the system.

    Air flow will also need to be checked, and if low this will cause oil migration to the evap coil.

    As for mixing oil this is not recommended as 41O is a blend and requires the use of POE oil which has an Azeotropic behavior. If Mineral oil is mixed two separate liquids would form and oil loss will occur.

  13. #26
    Join Date
    Oct 2010
    Location
    Texas
    Posts
    37
    Completely agree with AlcoMech. Change compressor, install suction dryer. When you get it up and running, you must find what caused the comp failure, or you will be doing it again...just a matter of time.
    Like I tell my guys constantly....Keep asking yourself.."why"!.. ;compressor failed?,why?... inadequate oil return?, why?..inadequate refrigerant flow?, why?...restricted refrigerant flow trapping oil?,why? etc.
    We get paid to fix the problem, not just a symptom of the problem.

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