Freezebear
05-10-2013, 05:59 PM
Hello, long time reader, first time poster here. Like the title says, I am wondering if anyone has tried using R407F in a residential heatpump application. My friend's system is a 5year old, 3Ton, R22 system in excellent shape but sprung a leak in the evaporator so all the R22 is gone now. It has a TXV at the evaporator but uses a fixed-orfice outside for reverse-cycle operation.
I know I have to remove the compressor and drain the mineral oil and replace it with POE, no problem.
I have been digging around on the internet and have concluded that R407F would be the closest match for this application, but no technical info on anyone actually converting a R22 heatpump to R407F. Everyone seems to use R407C. But I read that R407C just isn't the best match for this system compared to R22. In this application, a small performance hit wont be that big of a deal since the house is fully insulated with sprayfoam. I have R407F on hand, but would have to buy a whole drum of R407C to only use 9 pounds of it.
So what do you think? Can it be done and what should I expect to encounter doing so?
Thanks.....
I know I have to remove the compressor and drain the mineral oil and replace it with POE, no problem.
I have been digging around on the internet and have concluded that R407F would be the closest match for this application, but no technical info on anyone actually converting a R22 heatpump to R407F. Everyone seems to use R407C. But I read that R407C just isn't the best match for this system compared to R22. In this application, a small performance hit wont be that big of a deal since the house is fully insulated with sprayfoam. I have R407F on hand, but would have to buy a whole drum of R407C to only use 9 pounds of it.
So what do you think? Can it be done and what should I expect to encounter doing so?
Thanks.....