Compressor specialist Bitzer has optimized its two-stage reciprocating compressors, which can be run with R448A and R449A refrigerants. Both refrigerants, with low global warming potential (GWP) values of 1386 and 1397, are eco-friendly alternatives to R404A, whose GWP value is 3922. The EU F-gas Regulation prohibits the use of R404A beyond the year 2020 in stationary areas.

According to Bitzer, tests have shown that the compressors can be run with the two refrigerants – both with and without a liquid subcooler. The application areas are similar to those of R407F.

In addition, Bitzer has fitted every model in its semi-hermetic two-stage compressor series with thermostatic expansion valves.