Early last year the German compressor manufacturer announced approvals for the use of the two refrigerants in its Ecoline and HSK/HSN-series semi-hermetic compressors. Now this has been extended to include its two-stage compressors.
Bitter says its 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 another lower GWP alternative, R407F. In addition, Bitzer has fitted every model in its semi-hermetic two-stage compressor series with thermostatic expansion valves.
With GWPs below 1400, R448A and R449A are seen as more acceptable alternatives to R404A, a common commercial refrigeration refrigerant with a GWP of 3922. The EU F-gas regulation prohibits the use of R404A beyond 2020 in stationary areas.
Chemours’ R449A is a blend of R32, R125, R1234yf and R134a, it has a GWP of 1397 and carries a non-flammable and non-toxic A1 safety classification.
R448A is Honeywell’s non-flammable, non-toxic A1 refrigerant to replace R404A, sold under the trade name Solstice N40. It uses the same components as R449A with the addition of a small amount of R1234ze(E). GWP is 1386.
Lower GWP blends in Bitzer compressors – February 22, 2015
GERMANY: Bitzer has produced an information sheet for those considering using some of the new lower GWP refrigerants and blends with its compressors. Read more…