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  1. #1
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    Aug 2010
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    Charge: r134a 0.90oz. how?

    http://www.crystalcoolers.com/Europe...ducts_E2O.aspx

    How would you charge something like this with such a critical charge?
    If there was a component changed, do you have to compensate for the difference in size?

  2. #2
    Join Date
    Sep 2005
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    florida
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    Quote Originally Posted by ICanHas View Post
    http://www.crystalcoolers.com/Europe...ducts_E2O.aspx

    How would you charge something like this with such a critical charge?
    If there was a component changed, do you have to compensate for the difference in size?




    Weigh the charge in remember to compensate 2oz for your hose. And yes
    I love the smell of phosgene first thing in the morning:

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  3. #3
    Join Date
    May 2009
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    In the Hudson Valley of New York
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    Quote Originally Posted by ICanHas View Post
    http://www.crystalcoolers.com/Europe...ducts_E2O.aspx

    How would you charge something like this with such a critical charge?
    If there was a component changed, do you have to compensate for the difference in size?
    Put the entire machine on the scale, since it is 134A you can charge it vapor.

  4. #4
    Join Date
    Sep 2008
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    Quote Originally Posted by EugeneTheJeep View Post
    Put the entire machine on the scale, since it is 134A you can charge it vapor.
    That's probably the best idea I've heard, yet.

  5. #5
    Join Date
    Feb 2012
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    Toronto Canada
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    1,090
    Make sure you know how much refer is in the hose you got. Those ultra low machines need to be charged 100% right or it won't work right.

  6. #6
    Join Date
    Apr 2012
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    Paper Street Soap Company
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    Electronic scale. Convert it to grams.

    .90 ounces is 25.52 grams. Dont most digital scales have grams ?

  7. #7
    Join Date
    Jul 2000
    Location
    Guayaquil EC
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    10,487
    I think if I needed a highly accurate way of metering out 0.9 oz of R134A, most digital scales wouldn't cut it because their accuracy and resolution simply isn't tight enough. A good scale with .1 oz resolution might get you between .8 - 1.0 oz, but is that good enough?

    A small charging cylinder might work:

    http://www.hvacr-tools.com/product/t...r-16-oz-r-134a

    But then, what about charging by the change in the pressure of the vapor in a cylinder? If the internal volume of the cylinder is known, vapor density info from a refrigerant properties table or program along with some simple calculations should work quite well. Remember we calculated how much vapor is left in an "empty" cylinder? I'm guessing this may as simple as taking a recovery tank with vapor at say 70 psig and metering out to maybe 45 psig. I haven't done the numbers, but that's my thought.

  8. #8
    Join Date
    Jul 2000
    Location
    Guayaquil EC
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    10,487
    The amount of R134A liquid in a 1/4" x 6 ft hose is .33 oz/ft or about 2 oz, but the weight of vapor is about 1/75 times that, or around .027 oz.

  9. #9
    Join Date
    Sep 2005
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    florida
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    Quote Originally Posted by icemeister View Post
    The amount of R134A liquid in a 1/4" x 6 ft hose is .33 oz/ft or about 2 oz, but the weight of vapor is about 1/75 times that, or around .027 oz.




    Who in there right mined charges anything with vapor.
    I love the smell of phosgene first thing in the morning:

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  10. #10
    Join Date
    May 2009
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    In the Hudson Valley of New York
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    Come on guys, you could just charge it the old fashioned way, amps, suction line super heat and pressures, all approximate of course. I would have already been done with this job, got paid, and it would have never been a thread here.

  11. #11
    Join Date
    Sep 2002
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    Virginia
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    3,335
    Quote Originally Posted by crackertech View Post
    [/COLOR]



    Who in there right mined charges anything with vapor.
    oh hell thats easy dude ... just keep givin it squirts until shes beer can cold , and then race outta there like a heard of turtles , cuz shes good to go !


  12. #12
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    Sep 2008
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    Western PA
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    Quote Originally Posted by crackertech View Post
    [/COLOR]



    Who in there right mined charges anything with vapor.
    Small units, I do.

    It doesn't take long and allows me to charge more accurately.

    Everything else gets liquid charged

  13. #13
    Join Date
    Jul 2006
    Posts
    6,627
    Quote Originally Posted by Snapperhead View Post
    oh hell thats easy dude ... just keep givin it squirts until shes beer can cold , and then race outta there like a heard of turtles , cuz shes good to go !

    Im pretty sure Cracker forgot more about med and low temp than most, im just here to watch.
    You sure are cocky for a starving pilgrim.

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