10 years ago I have done a few "conversions" where I put 407c in over 22 and it worked well in most cases. I remember when it all came out that they said oils and refrigerant would NOT mix together, but they will more than likely they will mix a little and work. Just not nearly as effective or efficient.
First of all, just because the oil isnt miscible with 407-c doesnt mean you will get zero oil return. These practices are taught to technicians to cover ALL situations. That doesnt mean however that 407-c with mineral doesnt work in some situations. On smaller package systems or even splits on the samr elevation with short line sets, you wont have any problems. The other thing nobody wants to talk about is the fact that poe oil is a detergent. So, sure, you will get better oil return with poe. But if you just swapped a compressor out on an old ass system thats full of scale from technicians brazing with ni nitrogen. All that gunk in your system is gonna wash out into your filter drier/metering device. So good job. You got slightly better oil return and youre gonna be back in 2 weeks fixing a restriction.
407 C works great on most R 22 systems but not all ...never top off but total re charge after an leak repair ....but & but depends to me on where the compressor is... Lower than the evap or above the evap & diffidently Not unless compressor is below Evap for oil return & or add a few oz of POE & or an product called super change makes 407 C miss-able @ least according to its manufacturer or just use 427A no poe required but lot more expensive
Isn't there an "unofficial" approved method soft-recommended by some suppliers, which was hinted at in this video? The only question is what is the calculation of how much POE to add based on the original charge? Comments on how effective and lasting that was in actual results?
When I worked for my old boss he would have me throw in 407c, mo99 , 448 whatever we had into 22 systems . Sometimes topping off on existing 22 mixing gases or fresh refrigerant on evap changeouts ( we mainly do refrigeration) . There wasn’t one compressor that went bad over the 6 years I worked for him .
Yes I know it will work but it becomes impossible to charge precisely (and it’s illegal). Although, it really doesn’t matter much in systems like that. Lot a times we are just trying to et them by.
I have avoided 407c in medium temp refrigeration but have used it in air conditioning with success. There is capacity loss. If you keep the mineral oil only the problem comes in lack of oil return which will lead to a compressor that is not properly lubricated and will overheat and lock up
I'd like to use window AC compressors to make a "silent" air compressor. I've read they all used mineral oil, but never decided on a good way to keep that oil in the compressor.
