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Thread: 5 ton ac

  1. #1
    Join Date
    Sep 2006
    Location
    TEXAS
    Posts
    22

    5 ton ac

    service call was unit not cool, (but the house is cool not enough but it is cool), unit runs all day and night, never turns off.
    set gauges low of r22, cut coil and washed coil, coil dirty.
    soldered coil back to unit, opened valves done, so i thought got a call back still doing the same thing.

    ruud unit
    md#uamb-060jaz
    split system

    subcool
    psi-250
    temp-118 liquid line temp @ evap coil-27.5

    superheat
    psi-64
    temp-35
    suctionline temp-73 (6-8 from compressor).

    any ideas guys really need the help thanks.

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,895
    We'll be glad to help - but: need to get yourself promoted to professional member so we can move this thread behind closed doors. Site rules don't allow technical discussion here. You need 15 posts, so post a few more, try general or food maybe and apply for your pro membership.

  3. #3
    Join Date
    Sep 2006
    Location
    TEXAS
    Posts
    22
    thanks will do, 15 not a bad number.

  4. #4
    Join Date
    Aug 2009
    Posts
    33
    I'm in the same boat...13 to go (12 if you count responding to my own thread, not sure if that counts).

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,717
    Quote Originally Posted by smurry View Post
    I'm in the same boat...13 to go (12 if you count responding to my own thread, not sure if that counts).
    It counts.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  6. #6
    Join Date
    Sep 2006
    Posts
    1,253
    Quote Originally Posted by smurry View Post
    I'm in the same boat...13 to go (12 if you count responding to my own thread, not sure if that counts).
    What time is it there in Houston? (this should make you at 15)

  7. #7
    Join Date
    Sep 2006
    Location
    TEXAS
    Posts
    22
    guys in a world of hurt thinking its the txv, but would like to hear your opinions as well thanks.

  8. #8
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,867

    Arrow Guess is, Hot Air leak into Return & Low R-22, ha

    Quote Originally Posted by dads View Post
    service call was unit not cool, (but the house is cool not enough but it is cool), unit runs all day and night, never turns off.
    set gauges low of r22, cut coil and washed coil, coil dirty.
    soldered coil back to unit, opened valves done, so i thought got a call back still doing the same thing.

    ruud unit
    md#uamb-060jaz
    split system

    subcool
    psi-250
    temp-118 liquid line temp @ evap coil-27.5

    superheat
    psi-64 is SLT 73 -37-SST = huge 36-F Superheat

    temp-35> 64-psig is 37-F
    suctionline temp-73 (6-8 from compressor).
    any ideas guys really need the help thanks.
    Well, 36-F is a lot of superheat, also there is no Subcooling, therefore there's either not enough liquid refrigerant entering the coil or you have a huge hot air leak into the Return-Air system.


    Could be a combination of both, hot air source leaking into the Return & low on R-22. Just a guess... - Darrell

  9. #9
    Join Date
    Sep 2006
    Location
    TEXAS
    Posts
    22
    thanks bud will check, and will keep you guys posted.

  10. #10
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,867
    Quote Originally Posted by dads View Post
    thanks bud will check, and will keep you guys posted.
    Also, data indicative of low charge, & several other problems.

  11. #11
    Join Date
    Apr 2004
    Posts
    7,680
    condesner (low subcooling) - not enough charge
    evaporator - (high superheat) not enough charge
    Where is it? Cant be hiding somewhere else.

    37 degree coil doesnt suggest a huge load on the system. Although I am confused how you measured 27 at the evaporator?

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