Bitzer has modified all models of its 2-stage reciprocating compressors to enable them to run with R448A and R449A refrigerants. With low global warming potential (GWP) values of 1386 and 1397, both refrigerants are eco-friendly alternatives to R404A.The EU F-gas Regulation prohibits the use of R404A beyond the year 2020 in stationary areas.

Transitional refrigerants such as R448A and R449A are needed on the path towards blanket use of low GWP refrigerants and for special applications. According to the company, tests have shown that the technically improved compressors can be run perfectly with the two refrigerants — both with and without a liquid subcooler. The application areas are practically identical to those of R407F. In addition, Bitzer has fitted every model in its semi-hermetic 2-stage compressor series with thermostatic expansion valves.