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  1. #1
    Join Date
    Jan 2005
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    steeler nation
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    how to charge 1.5 oz of 134a

    a wine cooler belonging to a friend of a friend of the owners showed up in the shop. this is a small cooler from a box store , maybe 20 bottle capacity. it no cool. i put a schrader in the process tube and started to play with it. how does one weigh in 1.5 oz of 134a. my electronic is + or - .5 oz. my plan is to charge it slowly until the suction line stops frosting and the case cools. anyone have any ideas?
    IV IV IX

    use your head for something other than a hat rack.......Gerry

  2. #2
    Join Date
    Jan 2011
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    1,223
    For critical charge units we used to use one of these. Probably too much to spend for the little job you have. I'd be tempted to do it your way.

  3. #3
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    Jan 2005
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    steeler nation
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    Quote Originally Posted by KnewYork View Post
    For critical charge units we used to use one of these. Probably too much to spend for the little job you have. I'd be tempted to do it your way.
    the old dial a charge. i forgot all about those things. i used to have one that had a heater in it. i didnt know they still made them.
    IV IV IX

    use your head for something other than a hat rack.......Gerry

  4. #4
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    19,571
    You use a 4" hose with a little valve, on the end of your normal hose. Pull the vac.

    Now, close the little valve on the 4" hose. Fill the normal hose with refrigerant, jug on the scale. Zero the scale.

    Now, use the little valve on the short hose to meter in 1.5 oz. You can cap the short hose, and leave it there.

    Done.
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  5. #5
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,335
    put gauges on , vacuum down , hook up 134 bottle , purge line , open gauge valve and count out loud " one mississippi " , close valve , done.


  6. #6
    Join Date
    Feb 2006
    Location
    USA
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    4,381
    I think the smallest amount I recall using is like 7oz ... I use crt and purge the hose w/liquid to the crt. Zero the scale and charge to spec.

    Sent from my SGH-T999 using Tapatalk 2

  7. #7
    Join Date
    Nov 2010
    Location
    MN
    Posts
    147
    Disk you find the leak on this thing?

  8. #8
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,570
    I usually charge these things until 15-20 PSI suction pressure. Always seems to work fine. If it has a static evaporator, you can feel it to get an idea of the charge level. usually about 3/4 to 7/8 of the evap will be cold and the remainder will be the superheating portion.

  9. #9
    Join Date
    Jun 2003
    Location
    Tampa Bay, FL.
    Posts
    120
    If you plan on checking the high side, don't forget to prefill that hose with liquid before you zero your scale. Otherwise you may take too much refrigerant with you when you disconnect the hose. Or better yet, use a "stubby" gauge.

  10. #10
    Join Date
    Jan 2005
    Location
    steeler nation
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    thanks for the help. there obviously is a leak in this thing or i wouldnt have to add gas. i pressured with nitro at 100 psi overnight and didnt lose pressure. i leak tested with my h10 and didnt pick up anything in the compressor and condensor section. may be a leak in the evap but i am not going to tear this thing apart to find it. i already have more labor time in this thing than it is worth. i will give it another try tomorrow morning and use the suggestions that have been provided. i'm just not used to doing anything this small.
    IV IV IX

    use your head for something other than a hat rack.......Gerry

  11. #11
    Join Date
    Jun 2003
    Location
    Tampa Bay, FL.
    Posts
    120
    Quote Originally Posted by viceman View Post
    thanks for the help. there obviously is a leak in this thing or i wouldnt have to add gas. i pressured with nitro at 100 psi overnight and didnt lose pressure. i leak tested with my h10 and didnt pick up anything in the compressor and condensor section. may be a leak in the evap but i am not going to tear this thing apart to find it. i already have more labor time in this thing than it is worth. i will give it another try tomorrow morning and use the suggestions that have been provided. i'm just not used to doing anything this small.
    Sounds like you have a restriction instead of a leak.

  12. #12
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    1.5oz total charge? May not be a leak. You probably lost 30-50% of you charge hooking your gauges up.

  13. #13
    Join Date
    Jan 2013
    Location
    Wisconsin
    Posts
    23
    Ummmm........use a charging cylinder for R134A. They come with directions and are made for critically charging in small amounts of refrigerant. Done.

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