Dear members,
I'm new to this, and I've a small question that I faces on my daily work..
I know that R417a substitutes R22 with some loss of performance of course at about 5-10% , but my question is: on an equipment running with R22, can I just add R417a ontop of the existing R22 (leakage problem), OR should I need to empty the equipment first and fill it with R417a completely?
please advise!!
Urgent