Cool, what do you know about servicing a mini split lol. I have a vaccum and guages. I found R410a on ebay along with some scales... I bent the crap out of the copper line when I was installing it(leak), I am pulling the line and taking it to a proper hydraulic company that makes hoses and put the 90 bends and flare fittings this time... I think that I got it, I just dont understand the POE oil and how do I know if I need to add some. I was taught A/C on a recovery machine and it would recycle the oil, I have not done this w/o a recovery machine! I am sure that my unit is dry. Also, should I add a dryer to the liquid line? I have a feeling that you know the answer!
I don't have much experience with those. I only do r134a and r12
If the system is opened to ambient air, i'd pull the whole thing into vacuum, and add oil with the Freon when you recharge.
If it's a new system (compressor) then you probably need to add oil, but I don't know for sure, some new compressors come pre-oiled nowdays.
I'm just not sure how it's going to work without pulling it down to vacuum, all that moisture in there..
i'd def go with a receiver/dryer, not sure how it'd work without, but i'd need to get my hands on it to figure it out.
I can do cannabis diagnostics over the internet but not tech stuff very easily