Conversion of existing (H)CFC and HFC systems to R290 or R1270

From a purely refrigeration point of view, a conversion of R22 or R404A/R507A systems is possible, provided the design of the main components (compressor, evaporator, condenser, receiver) allows such a measure, General chemical and physical properties of R290 and R1270 und Compressor technology. However, given the specific properties of R290 and R1270, a change in line components and a replacement of the oil are required. Nevertheless, a conversion appears to be feasible only in exceptional cases due to the required protective measures. It is limited to systems that can be adapted to the relevant safety regulations for group A3 refrigerants at a reasonable expense.