I know this may come across to many as a silly statement, but, I feel obligated to say it. Purging your Manifold and Hoses is the "right thing to do", but we seem to be nit-picking. When I hook up my set that is dedicated to
R404 (as an example), I purge the air out before I do anything, which is important when the suction is in a vacuum. However, when I hook up my set that is dedicated to R-22, I do the same thing.
I am not advocating buying a truck full of Manifold Sets, I am simply saying that having a set for Mineral Oil/AB, a set for POE, a set for R410a, and a junk set for acid burns seems to be prudent.
It is strange to say that I SHOULD have only one Manifold that I need to clean out between Refrigerants. I have way to much on my plate to worry about that. Does that really make me lazy?
Yeah, While I don't claim to know it all, or think that I do, I have enough experience and qualifications to get by. I am a bit of a Quack cause I know I can always learn more. This field of work is ever changing and you never know it all, whether YOU believe it or not Bee. I am on HVAC-talk for that reason, and I'd even go as far to say you could learn something from me and visa-versa. Let's all drop the attitudes and maybe this forum could be more useful. Good day.
The question remains, do you use different recovery units also? There would be far more oil in the recovery unit than the insignificant amount in the hoses.
4 valve brute, 5' hoses, ball valves-22 vac/charge
4 valve titan, 4' hoses, ball valves-410 vac/charge
2 valve YJ, 2' hoses, ball valves - recovery/dirty
2 valve YJ, 3'hoses seal right - 410 test
2 valve black max, 3' hoses with bv -22 test
Fieldpiece sman3, 3'hoses with bv-everything test
since I've bought the digital manifold, my analogs barely move. Would never use a good set of gauges for recovery tho. Blow nitro through fairly regularly...I still feel more comfortable separating mineral and poe whenever possible