Jun 4, 2013 · I have heard that 407c doesn't have that great of oil return so using on a rack with an oil seperator is why it is for supermarkets. 407a has a better oil return (mixing ability). Kinda like r422d (I think) has crapy oil return and must be ran with about a 50/50 poe and alk.

May 5, 2016 · An R-407C compressor and an R-22 compressor are the same mechanically. The difference is that an R-22 compressor will have mineral oil in it and an R-407C compressor will have POE oil in it. R-22 will happily run over POE oil so the answer is: yes; that R-407C compressor is also compatible with R-22. PHM-----

May 22, 2019 · There are additives that I have used for years on 407c conversions. As long as there is no acid in the system they work great Diversitech makes one. Diversitech 981 you do need to read and follow directions as well as purchase the tool for the can. I have never had any issues with it. Someone mentioned Supco 88 how is it?

Jul 20, 2019 · When R-407C first became available I was curious about it all but I don't pay a lot of attention to the hard details of it now. It does make me smile to remember those charts for mixing refrigerants. Because now there is a horror for the practice heavily inculcated into …

Apr 17, 2019 · The absolute best thing to do with those units is to use R-22 over mineral oil. The reason is there is no oil pump in them. And they have a robust history of failures after converting. 407C over POE is the only thing Trane recommends, but the recommendation comes with hesitations; think they say something like "If you cannot acquire R-22."

Oct 14, 2018 · Join Date Sep 2002 Location Virginia Posts 14,684 Post Likes Likes (Given) 1722 Likes (Received) 5172 Dislikes (Given) 4 ...

May 22, 2016 · So I am at the parts house chatting with other techs about the price R22 and I come to find out that there are some techs that are no longer buying R22 and just adding 407C to R22 systems that are low on charged. I am told that it is "ok" to mix the two. To me, this is an unacceptable practice. Anyone have any thoughts on the matter?

Apr 6, 2020 · Thanks for reply. The parts house push oil change every time you change R22 to 407C. Reason I was wondering because sometimes you run across a customer that has refrigerant leak and wants to get by until summer to change the equipment. It just doesn't make a lot sense to do oil change if the equipment that is going to be change out soon.

Jul 11, 2016 · Here is some info on 407c. It shows how you need to watch out when looking at charts. Attached Images Attached Images File Type: pdf R-407c by Kevin.pdf (1.02 MB, 31 views)

Oct 19, 2019 · Topped up a 404A system with approx 3lbs of 404A. What I didn't know that the system was changed to 407C at some point. Total gas inside around 110lbs. Don't think it's a big deal as they are both blend gasses and use the same oil. What do you guys think. Everything working well atm.