Quote:
Originally Posted by leathermang
Your system needs to be checked pressurized.. that is the way the seals are when working... vacuuming is for the moisture removal.
Nitrogen ... in addition to the pressure checking procedure is used to remove moisture also... triple evacuation on home systems is pretty standard... the dry nitrogen takes up some moisture.. you take it out... repeat.....
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After I pressure test I usually pull a vacuum and let it stand with gauges attached so I can see if there are any changes. I have had systems that are ok on pressure but leak on vacuum.