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For what it's worth, I installed a two ton Mitsubishi about 2.5 years ago and was able to pull a vacuum to the specified micron levels with a middle of the line pump from Robinair and the automotive a/c hoses that came with my Robinair manifold set (I added a micron gauge to the manifold and appropriate fitting adapters to the lines). I also pressure and leak checked using nitrogen (swept the system as the manual described as well.).
It sounds like the guys working on your system are not sure of what they are doing, and/or not following best practices steps.
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