Good morning, my colleagues, I want to know if you can support me with the data of the type of substitute refrigerant for R12. My question is what is appropriate since they told me that there is mop49 and mp39. Of which I will use it in a semi-hermetic compressor 5hp brand copelan in a refrigeration chamber with evaporation temperature -4 degrees Celsius and also know if I can use oil.AB with any of the 2 refrigerants would appreciate that they will help me.

Hello how are you, you can use mp39 (r401) or mo49 (r413) and MO or AB oil either, and those refrigerants are charged in liquid face with diffuser valve greetings.