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You can use the R-407C in the R-410 system - IF it has a piston metering device. If there is a TXV - that will have to be changed to R-407 as well. When you are choosing the new TXV bear in mind that the system capacity will be 33% lower than it is with R-410. If it is 3 tons now - it will be 2 tons after the refrigerant change.
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?
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.
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 newer recruits. <g>
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?
R-22 is 33% miscible with mineral oil, the oil separator removes 98% of the 33% oil that travels with the refrigerant, 407c is 4%to 10% miscible with mineral oil and the oil separator removers 98% of the 4% of the oil that travels with the refrigerant,the capacity of the oil separator would be enhanced by an non-miscible refrigerant, in a ...
In Philly it seems to be common to top of R-22 with whatever R-422b or R-407c. As one fellow told me; R-22 is a bunch of chemicals with a boiler point at 70 degrees, R-407c is a bunch of chemicals with a similar boiler point, as is R-422b. I don't agree but I know long term (this has been going on for a long while) it doesn't seem to effect the ...
Has anyone attempted to swap R22 to 407c or M099 on a Trane screw chiller? My colleague pulled the remaining r22, removed all the oil as per data plate volume. Replaced the oil charge with Trane POE oil 48. Charged with r407c. Resulting in low entering oil temp faults. They then removed the r407c and added the M099 to 95% of data plate charge.
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)
R-407C has the closest property match to R-22 in an air conditioning retrofit project compared to other blends on the market. It can also be used in medium temp R-22 refrigeration systems. R-407C has a 10°F temperature glide.