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  1. #1
    Join Date
    Aug 2003
    Posts
    59
    I had a Carrier 5 ton A/C split system I was going through for a spring inspection and when I got out to the condensor I could hear the compressor making like a laboring sound and then it would go away.Continuosly.
    I put the guages on and the high side was fluctuating between 225 and 150.Ambient temp was about 58 deg.This is the first time I ever saw this system. It has a piston for an orfice.Suction was about 65 constant.Any suggestions or ideas? Thank you

  2. #2
    Join Date
    Feb 2005
    Location
    Alabama
    Posts
    534
    Did the inside piston size match the outside piston size? what wa the delta "T" accross the coil? Was the inside coil clean? More info would be helpful, without seeing the system and taking readings it's hard to guess what the problem could be.
    "If you can't fix it, don't break it."

  3. #3
    Join Date
    Mar 2003
    Location
    North St Paul MN
    Posts
    858
    Moisture in the system? Maybe previous tech forgot to purge the air out his hoses before checking the charge, or charging. Does the system have a filter/drier?
    I'd rather have a bottle in front of me, than a frontal lobotomy.

  4. #4
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    non-condensables?
    Karst means cave. So, I search for caves.

  5. #5
    58 degree ambient sounds like you have some kind of low ambient control

  6. #6
    Join Date
    Aug 2003
    Posts
    59
    Interesting.
    I did notice some oil residue around the suction valve area.I checked the shrader valve,good and tight.

  7. #7
    Join Date
    Dec 2002
    Location
    Toledo, Ohio, United States
    Posts
    12,911
    bad valves?
    No Heat No Cool You need Action Fast

  8. #8
    Join Date
    Apr 2004
    Posts
    7,680
    Im with Kerndt on this one, 58 is no load and unless there is a low ambient control (which is a form of manipulating the HP control) it shouldnt be run. If it did have the low ambient kit, it may be that is working.

    Was the OD fan cycling?

  9. #9
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,962
    Fluctuating head pressure is usually an indication of non-condensables in the system, fluctuating metering or gross overcharge.

    Since there was no load and the outdoor ambient temp was so low, my first guess would be it was flooding liquid back to the compressor simulating a gross overcharge.

    Take two months (till it warms up) and call us in the morning.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


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