Quote:
Originally Posted by funola
Example: one contractor says most of the leaks in their experience through the years of mini split installs is in the evaporator, so they braze the connection at the evaporator instead of using a flare. When asked if they purge the lines with Nitrogen while brazing (to prevent oxidation), their answer was no!
I asked another contractor if they pressure test with Nitrogen and the answer was no! They just do a vacuum, if no leaks, they let the refrigerant out! Not going to name names but this was a Fujitsu Elite contractor.
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I can see the logic to brazing, as dependig upon what direction you want the line set I think it may be easier to cut off the connection on the evaporator, have a much shorter lever arm there to stress it, then just pull and secure the line set where it needs to be.
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.