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  1. #1
    Join Date
    Jul 2009
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    Columbia, MD
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    Gauges for different refrigerants

    what are your beliefs on using the same gauges for different refrigerant systems?

    r-410a with r-22 for example.

    Do you believe it will cause compressor and txv failures?

  2. #2
    Join Date
    Aug 2001
    Location
    Pavilion, NY
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    2,020
    Until me and sman met and got married,, I always used separate gauges (22 every day, 22 4way evac, 410 every day, 410 4-way evac) since the honeymoon stage me and ms. Sman share the love with everyone.
    ...

  3. #3
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    may be this should be moved to tools and test equipment?

  4. #4
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    Sep 2008
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    Western PA
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    I've used my DC (and YJ analogs before that) on various systems containing probably a dozen different refrigerant and at least 4, if not 5 different types of oil.

    As long as good procedures are followed, there isn't a problem.

  5. #5
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    Feb 2009
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    Tallahassee, FL
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    Yep good techniques are the most important. Me personally has not fallen on the digital bandwagon.

    And I have a Poe set and a mineral set. Basically like the resolution difference.

  6. #6
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    Sep 2008
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    Western PA
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    Quote Originally Posted by SBKold View Post
    Yep good techniques are the most important. Me personally has not fallen on the digital bandwagon.

    And I have a Poe set and a mineral set. Basically like the resolution difference.

    This is the difference.

    If you're using a 410a set on a R134a freezer, you're gonna have problems...

  7. #7
    Join Date
    Feb 2009
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    Tallahassee, FL
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    Whys that jp I don't have a problem personally.

  8. #8
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    Sep 2008
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    Western PA
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    Quote Originally Posted by SBKold View Post
    Whys that jp I don't have a problem personally.
    With one division of the gauge being equal to 5 PSIG, it's kind of difficult know what your suction pressure is, exactly, making it more difficult to get an exact superheat.

  9. #9
    Join Date
    May 2011
    Location
    Western, KY
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    2,591
    Same gauges all the time. I try to do the pull the through technique when removing them(sucking everything through low side) and then I leave the ball valves open so nothing is left in it. I purge the hoses with system pressure every time I hook(I dont work on critically charged systems)

    I've already seen dry r-22 units and replacement compressors using POE so trying to keep gauges dedicated to one type of oil would be hard.

  10. #10
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    Feb 2009
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    Tallahassee, FL
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    I see what you mean about that but you will admit the degree difference between 0-5 is negligible.

  11. #11
    Join Date
    Feb 2009
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    Tallahassee, FL
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    Actually don't admit that should have looked before. Lol.

  12. #12
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    Sep 2008
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    Western PA
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  13. #13
    Join Date
    Sep 2008
    Location
    Western PA
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    10 degrees is negligible?

    R-134a

    1# = -12.3F
    5# = -3F


    While you can interpolate between gauge lines, even the difference between 1 and 2 psig is nearly 3 degrees.

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