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  1. #1
    Join Date
    Dec 2012
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    Daphne, AL
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    60

    Scroll Compressor head wear

    I have a senior tech. at my company who believes that scroll head wear, producing micro metallic particles, which are not stopped by the liquid drier, and will eventually clog the TXV. Does anyone believe this thoery, or heard it, or actually seen it in the field.

    Very curious what others think.

  2. #2
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
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    6,048
    I don't see how the small particles can get through the drier but clog up a txv .

    If they are small enough to get through the drier than it would also get through any kind of screen or orifice. IMO

    Eventually living in the compressor oil sump.

  3. #3
    Join Date
    Dec 2012
    Location
    Daphne, AL
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    60
    thanks for the opinion.

  4. #4
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
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    4,388
    Quote Originally Posted by waregl82 View Post
    I have a senior tech. at my company ...
    and he is the 'senior' tech???

  5. #5
    Join Date
    Mar 2009
    Location
    Mid-Mo
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    3,595
    First I'd have him explain to me how a scroll compressor has a "head" then we can go from there. I also don't buy it.

  6. #6
    Join Date
    Dec 2002
    Location
    in a house, Appomattox, Va.
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    3,308
    I assume by head he means the two scrolls.I've wondered that myself, and believe brought up on this site before.

    Scroll compressors supposedly wear in as opposed to piston rings and valves wearing out, that implies wear and particulate.

    awhile back some manufs had brown stuff jamming the moving parts in txvs. My theory is that some very fine material plus a little moisture in system resulted in the brown stuff in txvs (rusty sludge). Moisture does tend to freeze up at metering devices when there's enough, right?

    other than that, couldn't say.

    I would add, that I have seen jammed up txvs on system where the oil was silver gray colored,and some working systems as well, and f/ds in system.
    Col 3:23


    questions asked, answers received, ignorance abated

  7. #7
    Join Date
    Dec 2012
    Location
    Daphne, AL
    Posts
    60
    By "scroll head" I mean the stationary and orbiting scrolls. Sorry for the weak terminology. Hey Billygoat22, when you mention "silver gray" oil, do you believe that metal particulate is creating that color. Also, what does f/ds stand for. Still getting used to the site terminology.
    Thanks

  8. #8
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    He meant filter drier. I've pulled metal out of txvs and driers before but most of the time it had been the result of a failure of some kind. We have some people that don't do the best system cleanups after changing compressors or other system components. Next time be sure to get pictures.

  9. #9
    Join Date
    Jul 2000
    Location
    Dallas,Texas
    Posts
    4,956
    The scrolls don't touch.

  10. #10
    Join Date
    Dec 2002
    Location
    in a house, Appomattox, Va.
    Posts
    3,308
    http://hvac-talk.com/vbb/attachment....&thumb=1&stc=1

    can't see to well, but the gray on this acid test is from the gray oil.

    this unit had a bad compressor- ran in vacuum/ low pressure due to bad txv on evap coil and burned out comp motor- melted blanket and wires to side of comp.

    not sure what happened first in this unit.
    Attached Images Attached Images  
    Col 3:23


    questions asked, answers received, ignorance abated

  11. #11
    Join Date
    Dec 2002
    Location
    in a house, Appomattox, Va.
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    3,308
    As far as the gray oil- I can only assume very fine iron powder, could just as well be anything else, but the few I've seen were only on scroll systems.
    Col 3:23


    questions asked, answers received, ignorance abated

  12. #12
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    I hope he was drunk when he made that statement...........
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  13. #13
    Join Date
    Jul 2000
    Location
    Dallas,Texas
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    4,956
    Quote Originally Posted by carmon View Post
    I hope he was drunk when he made that statement...........
    I'm not sure whose sobriety is in question...

    Let me qualify my earlier statement. The scrolls do not ride against each other like a bearing. Depending on manufacturer, they will rouch at several points in a 360 degree rotation or they do not touch at all and oil makes the seal.
    So the chances of metal coming from the scrolls is minimal.

    http://www.docs.hvacpartners.com/idc.../811-20065.pdf

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