A Credit Interpretation Ruling from 1/12/2009 indicates that since R22 is an HCFC that it meets the Refrigerant prerequisite. But I read somewhere (and now I can't find it) that CIRs before a certain date in 2009 are invalid. Can anyone shed some light on this?

Is it safe to extrapolate that R-134a, listed in the manual as an HFC, is also ok?

Thanks!