EcoRenovator - View Single Post - Replacement for R-12

88xj · 11-10-21, 08:45 PM

epa.gov/sites/default/files/documents/Choosing_Right_R22_Retrofit.pdf[/url]

There are a number of approved blends that can replace R22.
many of them are a mixture of R-32, R-125, R-134a and other refrigerants.
Some include R-290 in the mix as well.

R-407a
R-407c
R-421a
R-421b
R-422a
R-422b
R-422c

R-427a
R-428a
etc etc

R-410 which is not an approved substitute is a 50/50 mix of R-32 and R-125.
R-134a is also not an approved R22 substitute

R-407F which is approved is 30% R-32 30% R-125 and 40% R-134a

So the devil is in the details of the percentage of each in the mix. Which is why when using those blends you have to charge the system with liquid not vapor to try to keep the % of each the same as what was intended.

11-10-21, 08:45 PM	#7
88xj Lurking Renovator Join Date: Sep 2020 Location: east coast Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts	epa.gov/sites/default/files/documents/Choosing_Right_R22_Retrofit.pdf[/url] There are a number of approved blends that can replace R22. many of them are a mixture of R-32, R-125, R-134a and other refrigerants. Some include R-290 in the mix as well. R-407a R-407c R-421a R-421b R-422a R-422b R-422c R-427a R-428a etc etc R-410 which is not an approved substitute is a 50/50 mix of R-32 and R-125. R-134a is also not an approved R22 substitute R-407F which is approved is 30% R-32 30% R-125 and 40% R-134a So the devil is in the details of the percentage of each in the mix. Which is why when using those blends you have to charge the system with liquid not vapor to try to keep the % of each the same as what was intended.