A long-term non-ozone depleting replacement for R-22 in low- and medium-temperature commercial refrigeration systems. Suitable for direct expansion evaporators. Do not use in systems that employ flooded evaporators. For new equipment and retrofits.
NotesLower capacity. Can replace HCFC-22 in many cases without having to change compressor lubricant. May be used with alkylbenzene, mineral oil and POE lubricants. If inadequate oil return is observed for AB addition of POE may be needed. Genetron 422D can, in most cases, be used with existing HCFC-22 thermostatic expansion valves.Larger valves may be needed in cases where the R-22 valve is near its maximum capacity.Lower discharge temperature than HCFC-22, which may extend compressor longevity.
Chemical NamePentafluoroethane, Tetrafluoroethane, Isobutane
Chemical NotationCF3CHF2, CF3CH2F, (CH3)3CH
Molecular Weight (lbm/lbmol)109.9
Boiling Point @ 1 Atm, (°F)-45.76
Critical Temperature (°F) (ASTM D-1321)175.2
Critical Pressure* (psia)566.22
Saturated Liquid Density @ 86°F, (lb/ft3)70.87
Specific Heat of Liquid @ 86°F, (Btu/lb•°F)0.35
Specific Heat of Vapor @ Constant Pressure* (Cp), @ 86° and 1 Atm, (Btu/lb•°F)0.2
Flammable range, %vol. in air (Based on ASHRAE Standard 34 with Match Ignition)None
ANSI/ASHRAE Standard 34-1992 Safety Group ClassificationA1