Quote:
Originally Posted by JHZR2
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Don’t know enough about precautions on brazing and gas use, but if the systems are line mine, the line set is not lrechsrged, the condenser is. So one could pull hard vacuum on the evaporator afterwards fwiw.
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Purging with Nitrogen when brazing is to prevent formation of carbon bits inside the copper line that could flake off and clog small passages.
I think most line sets are not pre-charged except MrCool DIY kits that Vstech mentioned earlier.