Quote:
Originally Posted by Rawknees'Turbo
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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Good work there. You probably had no brazed joints and good quality flares. Possibly used Nylog and all the things usually recommended.
They ran the pump all night was 413 microns at 2:50AM and 408 microns at 5:30 AM.
So it is dropping very slowly. The Navac pump is good we tested it by putting the micron gauge right on the pump and got 3 microns. I called Navac this morning to ask what they think is going on. We might be pulling against a small leak - that's my concern. The decay test will be the key thing to watch.