Have a leak- no idea what was in it but judging by the history I'm sure it was mp39, TXV says r12 so... Is med temp walk in air cooled pump down system with headmaster. Here's what makes my decision tough the compressor has been replaced within the last year with a POE oil- After I find my leak I'm thinking of switching to 134a but I just don't see a lot of walk ins with 134 I also know its considered a low capacity gas. So what do you think stay with the mp39 or convert to 134 since it already runs POE?
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