Are refrigerant cylinders color coded?

Beginning January 2020 per Air-Conditioning, Heating, and Refrigeration Institute’s (AHRI) Guideline N, Assignment of Refrigerant Container Colors, all refrigerant cylinders should be painted a gray-green color, specifically RAL 7044.

Are R134a and R1234yf fittings the same?

R134a and R1234yf are similar, however, R1234yf was created as a more environmentally friendly replacement to R134a. The biggest difference between the two is that R1234yf is mildly flammable and does require special handling.

What happens if you put R134a in a R1234yf system?

If you were to put R1234yf in a system designed for R134a, it looks like you’d end up with about a 10% loss of cooling capacity, but putting R134a into a R1234yf system would be a wash. It appears R1234yf oil is compatible with R134a (but not vice-versa), so shouldn’t be a problem there.

Can you use R134a dye in R1234yf system?

Shops can’t use a machine designed for R134a on R1234yf; the service fittings are different, says Eric Shultz, Mahle Aftermarket Inc. service solutions vice president and engineering manager. Changing fittings is illegal and unsafe.