Rule of thumb, you always use matched set. Older coil may die
soon(spring a leak) or if you want to reuse it, it needs flushing with
special chemical which is very expensive. (R22 and Puron oil is
different) Most techs does not want to do this. Also Puron runs at
higher pressure. Proper thing to do is to replace line set, coil and use
transfer valve. For more expert advice go to forum at
www.hvacmechanic.com I am not a tech. Just alert consumer.
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