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T77911S T77911S is offline
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Join Date: Oct 2006
Location: MYR S.C.
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ideal is 500 microns.
I have done this on my brothers 930. I never got 500 and each time he said just charge it. I did and it all leaked out.
no need to change oil. 380 is good.

I agree,. leak testing with vacuum os not good but we all do it/have done it as needed. nitrogen is best. charge it and see if it holds. also charge it then vacuum and repeat is best way to remove moisture. I have heard nitrogen is not good for 134 systems(?). I still used it on my 930. found a leak at the condenser but still have not fixed it.

if you cant reach 500, leave everything connected, turn off the pump and see if the micron gauge holds. if you get it down to say 1000 microns and it will hold it for a few days with the pump off I would charge it.

these are very large systems with a lot of places for leaks.
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Old 07-24-2017, 04:05 AM
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