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  1. #27
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,847
    Quote Originally Posted by Some Dude View Post
    Those things hit the wall a few years ago when they stopped using copeland comp.
    Well, the one i worked on yesterday had a techumseh. I don't think this was ever worked on it's entire life and to my dismay the suction stub on the compressor was kinked. Can't they do a better job piping. And the braze joints are just average. I expect pro welds!
    Last edited by KB Cool; 07-08-2012 at 04:02 PM.

  2. #28
    Join Date
    Sep 2002
    Posts
    2,718
    Move everything,the water cooler, the drum of 134 ,everything into a freezer that is -15f.use a medical syringe to add the proper charge!

  3. #29
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    Quote Originally Posted by ICanHas View Post
    About as accurate as trying to charge a package unit by weight from a cylinder still in a pallet on a fork lift that's on a platform scale. That is, using the reading from the platform scale.
    I don't understand the comparison lol

    Sent from my HTC Sensation 4G using Tapatalk 2

  4. #30
    Join Date
    Jul 2005
    Location
    Tulsa
    Posts
    280
    Yellow Jacket Accu charge or Robinair Dial-a-charge heated charging cylinder should work fine.

    this Accu charge for R134 has 1/4 oz for each mark. some come with 1/8 oz markings.


  5. #31
    Join Date
    Aug 2010
    Posts
    2,423
    Quote Originally Posted by hvac wiz 79 View Post
    I don't understand the comparison lol

    Sent from my HTC Sensation 4G using Tapatalk 2
    My point is that you can never get accurate weighing using the least significant count on a scale.

    Big truck scales reads to 20 lbs or so. If the spec calls for 75.00 lbs, you wouldn't use that scale to weigh in 75 lb by calling "when the scale reads 80" adequate.

  6. #32
    Join Date
    Jul 2006
    Location
    tri state
    Posts
    296
    just weigh in charge after vac ,pure liq. on discharge side and let it set for a few min.best is to precharge ur hoses br haveing a yellow jacket shutoff valve at end of hose then read scales till full weight is in, never failed me.
    life is at its best when u learn something new.

  7. #33
    Join Date
    Sep 2002
    Posts
    12,195
    0.90 ounces is about 25 grams - so if you use a gram scale graduated to tenths it would seem easy to be accurate. It's not going to be all That critical anyway. You could charge it by SSH at stabilized conditions and it would be close enough. I guess it would pay to use shutoff valve hoses though. <g> The factory probably weighs the whole unit on a gram scale as they install the charge. No one could afford to have these serviced for what a new one costs anyway.

    PHM
    ------




    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?
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  8. #34
    Join Date
    Oct 2009
    Location
    Raleigh, NC
    Posts
    790
    Have you ever looked at the refrigeration system in these bottled water coolers? Don't worry about charging them. You will never have to do it. Unless there is a bad switch or thermostat, any other problems you throw them out.

  9. #35
    Join Date
    Mar 2013
    Location
    Port St. Lucie, Fl
    Posts
    996
    Didn't you come up with some elaborate scheme to weigh in charges this small before?

    Buy a medical grade diaper scale, or steal one from your local NICU. That's what drug dealers seem to use. Their measurements are a lot more critical than ours.

    Take a ball valve hose connected directly to the refrigerant tank, ball valve end towards unit. Purge hose, charge unit by weight, close ball valve and you're done. Tare the scale when the hose is purged and full, of course.


    If it costs the customer less for you to repair that thing than it does to replace it, you need to increase your labor rate

    Sent from my DROID BIONIC using Tapatalk

  10. #36
    Join Date
    Oct 2009
    Location
    Raleigh, NC
    Posts
    790
    http://www.yellowjacket.com/content/...rgingHoses.pdf

    Page 27 shows a chart with liquid ounces per foot of hose for different refrigerants.

  11. #37
    Join Date
    Oct 2011
    Location
    East Charlotte Area of NC
    Posts
    421
    I used to use a Dial a Charge until I dropped it

    But have been successful with putting a stubby hose with ball valve on the condenser, purging to the ball valve with vapor, then opening the ball valve to control charge. That way there is little to know compensation for hoses. Use a mechanical scale (Shipping type scale) if you require extreme accuracy. I had a "Coffee Creamer Cooler" at a C-Store that had .34 lbs R-134a. Wasn't easy. Then found out They just replace them... cost more to repair than buy. Looking at the water cooler you are working on, can't be more than a couple hundred bucks. Buy the time you fix it, you'd have more in it than a new one would cost.

    Name:  BVhose.jpg
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    I'd like to find these.....

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    I can't fix it if it won't stay broke..

  12. #38
    Join Date
    May 2010
    Location
    Oxford, UK
    Posts
    336
    Wholesalers here sell a tiny scale, designed for the 1lb R600a etc cans. It has its own hose which is the very thin plastic pressure switch style with a bore of a few mm. Lots of domestic stuff here runs R600a or R290 and only has a few grams in.

    Bit like this one http://www.duoitl.com/emainset.htm?id=pro02&xcode=06

  13. #39
    Join Date
    Aug 2007
    Location
    Winter Haven, FL
    Posts
    4,265
    Take a can of 134 from the auto parts store and small drug dealers electronic scale.

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