Quote:
Originally Posted by TomWS
I'm going to be installing two mini split heat pumps for my workshop and wonder if air can be used to pressure test instead of nitrogen?
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I installed my mini-split.
My units came pre-charged... the charge was all in the outside units. I hooked up the line set per the instructions, and used assembly lube on the threads and faces of the flair fittings. Then I torqued the flair nuts on per the installation instructions. I used a torque wrench to do this. I didn't have a crow's foot wrench that would fit my torque wrench, so I welded one up from an open-end wrench and a cheap socket. the required torque force was higher than I would have expected, so I'm glad I used the torque wrench.
Since you're not brazing anything, you should be good.
Still need to pull a good vacuum, though. Now I wish I had used a micron gauge so that I could tell that I was getting a good vacuum. I let my vacuum pump run for a couple of hours with fresh oil...
But it's now two years later and it's chugging right along.
-AC_Hacker