R-12 Replacement Choices .. Retrofit of R-12 Systems to SuvaÂ® MP39, SuvaÂ® 409A, or SuvaÂ® MP66. (and R-500 to SuvaÂ® MP66) .. . These refrigerants replace R-12 in refrigeration. .. the last drop of liquid has just boiled. Above this.
Though a number of alternative refrigerants are marketed as "drop-in" replacements for R-12, there is really no such thing as a true drop-in replacement
At the present time the preferred replacement refrigerant for R12 is HFC RI34a.. However, R134a is not a 'drop-in' replacement for R12 because there is a need to change the compressor lubricant and expansion valve. Changing over from R12 to R134a can therefore be an ex-pensive and time consuming procedure.
The hope of â€œdrop inâ€ refrigerants has become common over the years.. such as R22, were developed to be used in existing R12 and R502 equipment.
RS-24 is a â€œDrop-inâ€ alternative for R12 which also provides a long term solution at. It provides, therefore, a one change solution to the replacement of R12 at .
The following answer only applies in the United States: As per the US EPA snap law, it is illegal to install any refrigerant into an R12 a/c system except R12, until .