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  1. #1
    Join Date
    Mar 2006
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    1,042

    Single gauges for hooked to a critically charged system

    Ive seen them but cant remember where. Used to checked the pressure on a system that hold a few ounces of gas. some pics would be nice too
    You can't kiss death without it kissing you back. Death is a passionate kisser.


  2. #2
    Join Date
    Nov 2001
    Location
    east kansas
    Posts
    8,035
    Regular guage and a fitting from most supply houses.
    Beware of advice given by some guy on the Internet.

  3. #3
    Join Date
    Jan 2006
    Location
    McQueeney, Texas
    Posts
    4,013
    We used to crimp the process/charging tube and braze it shut if it was that close.

    I also had a tool for GE systems you screwed onto a special fitting that allowed you to close the fitting off before removing the hoses- got stolen- will never find another one. Dates back to the 40's-60's anyway and not used anymore I think.

    Using ball valves or placing a new rubber seal in the hose end where it closes the valve core before the seal breaks is another way.


    Haven't done much of it lately (years)- perhaps there is a better way.

  4. #4
    Join Date
    Mar 2006
    Posts
    1,042
    what about those single digital gauges ?

    http://yellowjacket.com/product/853

    does anyone else make something like this.

    mostly going to be use for small 404a/134a units. I like the accuracy
    You can't kiss death without it kissing you back. Death is a passionate kisser.


  5. #5
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,870

  6. #6
    Join Date
    Mar 2006
    Location
    New Zealand
    Posts
    303
    Who's going to be first to remote the transducers from a Digi-cool instrument. Would be real easy to do. a,la Robinair and Cooper.

  7. #7
    Join Date
    Mar 2006
    Posts
    1,042
    Quote Originally Posted by kiwireeferman View Post
    Who's going to be first to remote the transducers from a Digi-cool instrument. Would be real easy to do. a,la Robinair and Cooper.
    thats what im wanting. i get the precision of a digi. but without the lose of gas on a 12oz system
    You can't kiss death without it kissing you back. Death is a passionate kisser.


  8. #8
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,408
    ball valves. i close both sides unhook very quickly and attach liquid hose to vapor line and let it dump back into the unit. i love doing it this way.

  9. #9
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,870
    Quote Originally Posted by gravity View Post
    ball valves. i close both sides unhook very quickly and attach liquid hose to vapor line and let it dump back into the unit. i love doing it this way.
    On a critical charge unit, this is a big mistake.

    Once you've trimmed the charge to where it needs to be, pull the hoses off and walk away!

    If you put that high side liquid in, you just over charged the unit.

  10. #10
    Join Date
    Apr 2010
    Location
    Ontario
    Posts
    474
    Would you consider installing good quality permanent gauges.
    ENJOY THE RIDE

  11. #11
    Join Date
    Mar 2006
    Location
    New Zealand
    Posts
    303
    Quote Originally Posted by jpsmith1cm View Post
    On a critical charge unit, this is a big mistake.

    Once you've trimmed the charge to where it needs to be, pull the hoses off and walk away!

    If you put that high side liquid in, you just over charged the unit.
    I believe you need to qualify that statement.

    Critical charge to me means manufacturer has stated the volume of refrigerant the system should contain.
    If the charge has been weighed, or put in with a charging cylinder how can it be overcharged by bleeding the high side hose contents to the low side.

  12. #12
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,870
    Quote Originally Posted by kiwireeferman

    I believe you need to qualify that statement.

    Critical charge to me means manufacturer has stated the volume of refrigerant the system should contain.
    If the charge has been weighed, or put in with a charging cylinder how can it be overcharged by bleeding the high side hose contents to the low side.
    You weighed in the exact charge, accounting for the volume of refrigerant contained in the hoses.

    You have also verified that the auperheat and subcooling are correct.

    Now, you're going to add a couple of extra ounces of refrigerant by emptying the hoses back into the unit?

    Yep, that's an overcharge.

  13. #13
    Join Date
    Mar 2006
    Location
    New Zealand
    Posts
    303
    Don't think so. The system calls for a 30oz charge. You charge till the scale shows 30oz has left the can. You turn off the valve on the can.
    Where did this magical 2oz come from.

    You are not measuring what has gone in, you are measuring what has left the jug.

    I don't believe you can use a scale to weigh very small volumes anyway.
    Hoses only need to move slightly and your up or down a 20-30 grams.

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