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Thread: charging liquid

  1. #1
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    charging liquid

    Trane RTAA 200ton just short of charge 50 lbs. I charged in vapor just like the manual says. Used heat gun to boost pressure on the tank,but still slow. Now the question, can I trickle in liquid without doing damage to the screw compressor? I did fix the leak, the relief valve blew because of 3 fan failures.

  2. #2
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    The factory charge on those units are wrong. If you weighed the charge and are 50 lbs shy of the nameplate you should be good. Those units operate the best when sucooling is 15 degrees.

  3. #3
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    You should have a service valve at the outlet of EXV, or inlet to evap. Feel free to dump liquid in there as fast as you like.

    You can charge liquid at the suction service valve also, using common sense. Don't hook up a 125# cylinder with a 3/8 hose and run full open.
    Although it may take it, I wouldn't try it.

  4. #4
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    Quote Originally Posted by drivewizard View Post
    You should have a service valve at the outlet of EXV, or inlet to evap. Feel free to dump liquid in there as fast as you like.

    You can charge liquid at the suction service valve also, using common sense. Don't hook up a 125# cylinder with a 3/8 hose and run full open.
    Although it may take it, I wouldn't try it.
    I was going to charge at the valves after the exv but they were so rusted that I figured I'd be asking for trouble if I'd even touch them with a wrench. I just vapor charged since I had two other chillers down. Thanks for the info.

  5. #5
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    Quote Originally Posted by always looking View Post
    The factory charge on those units are wrong. If you weighed the charge and are 50 lbs shy of the nameplate you should be good. Those units operate the best when sucooling is 15 degrees.
    I don't remember the 200 being a problem. I thought it was only 240 and up and only mfg before June '96. In those cases the second circuit was 100tons and the charge should be 130lbs R-22. Nameplate said 180lbs.

  6. #6
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    Quote Originally Posted by drivewizard View Post
    You should have a service valve at the outlet of EXV, or inlet to evap. Feel free to dump liquid in there as fast as you like.

    You can charge liquid at the suction service valve also, using common sense. Don't hook up a 125# cylinder with a 3/8 hose and run full open.
    Although it may take it, I wouldn't try it.
    if you pull the cores out it will go faster...they can take it easy.
    How to make the perfect "Half-Hitch" knot or any other boyscout knot in 3 easy steps...

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  7. #7
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    Quote Originally Posted by blewbyu2 View Post
    I was going to charge at the valves after the exv but they were so rusted that I figured I'd be asking for trouble if I'd even touch them with a wrench. I just vapor charged since I had two other chillers down. Thanks for the info.
    Back up wrenches come in handy there, I'd be careful charging there easy overcharge, as long as you don't do what DriveWizard said you'll be alright.
    Sic Semper Tyrannis.

  8. #8
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    Hmm

    When ever a unit is large enough and I don't want to load liquid I break out the recovery machine and pull vapor out of the jug and into the unit makes charging much faster! Or you could use cap tube charger eh they suck!

  9. #9
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    Quote Originally Posted by chrishvacman View Post
    When ever a unit is large enough and I don't want to load liquid I break out the recovery machine and pull vapor out of the jug and into the unit makes charging much faster! Or you could use cap tube charger eh they suck!
    Try that on an RTAA and you'll be there a week. Would work well on resi and small commercial...completely different animal.
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  10. #10
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    Quote Originally Posted by chrishvacman View Post
    When ever a unit is large enough and I don't want to load liquid I break out the recovery machine and pull vapor out of the jug and into the unit makes charging much faster! Or you could use cap tube charger eh they suck!
    assuming we are talking about a large unit, why pump vapor? why not pump in liquid? pumps much faster.

  11. #11
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    Hmm

    Do you know what happends when you dump liquid refrigerant into a chiller barrel that has a vac? OUCH! So the first 30-50psi better be vapor.

  12. #12
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    Does a recovery machine condense vapor into liquid?
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  13. #13
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    Thumbs up

    It depends on how much refrigerant you are moving normally no, recovery machine will knock if it's valves are open all of the way if you start to move liquid. The recovery machine pulls vapor from the top of the recovery cylinder and puts it back into the chiller. Think push pull without the pull.

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