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Thread: charging liquid
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08-10-2009, 09:17 PM #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.
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08-10-2009, 09:53 PM #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.
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08-10-2009, 10:11 PM #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.
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08-11-2009, 07:24 AM #4
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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.
Originally Posted by drivewizard
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08-11-2009, 07:14 PM #5
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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. Originally Posted by always looking
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08-11-2009, 07:16 PM #6
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if you pull the cores out it will go faster...they can take it easy. Originally Posted by drivewizard
The weak aren't destroyed by the strong.
The weak are destroyed by the under-estimated.
I know a famous song that ends in 'my nose'. The artist is dead. Know who?
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08-11-2009, 09:19 PM #7
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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. Originally Posted by blewbyu2
Sic Semper Tyrannis.
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08-22-2009, 01:23 PM #8
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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!
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08-22-2009, 01:49 PM #9
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Try that on an RTAA and you'll be there a week. Would work well on resi and small commercial...completely different animal. Originally Posted by chrishvacman
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08-22-2009, 02:18 PM #10
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assuming we are talking about a large unit, why pump vapor? why not pump in liquid? pumps much faster. Originally Posted by chrishvacman
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08-22-2009, 06:32 PM #11
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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.
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08-22-2009, 06:51 PM #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.
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08-22-2009, 07:03 PM #13
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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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