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.
Genetron® 422D
General Information
Item | Specification |
---|---|
ASHRAE # | R-422D |
Class | HFC |
Refrigerant Type | Blend |
Typical Lubricant | Mineral Oil |
Substitutes | HCFC-22 |
Contains | HFC-125 (65.1%), HFC-134a (31.5%), HC-600a (3.4%) |
Glide | Moderate |
Notes | Lower 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. |
Physical Properties
Property | Value |
---|---|
Chemical Name | Pentafluoroethane, Tetrafluoroethane, Isobutane |
Chemical Notation | CF3CHF2, CF3CH2F, (CH3)3CH |
Molecular Weight | 109.9 |
Boiling Point (°C) | -43.2 |
Freezing Point (°C) | -17.8 |
Critical Temperature (°C) | 79.6 |
Critical Pressure (bar) | 39.05 |
Liquid Density (kg/m³) 0°C | 1250.5 |
Specific Heat of Liquid @ Constant Pressure @ 25°C (kJ/(kg.K)) | 1.4429 |
Specific Heat of Vapor @ Constant Pressure @ 25°C (kJ/(kg.K)) | 1.0698 |
Vapour Density (kg/m³) 25°C | 4.49 |
GWP | 2729 |
ODP | Non-ozone depleting |
ATEL/ODL (kg/m³) | 0.26 |
Practical Limit (kg/m³) | 0.26 |
AIT (°C) | ND |
Flammable range, %vol. in air (Based on ASHRAE Standard 34 with Match Ignition) | None |
ANSIASHRAE Standard 36-1992 Safety Group Classification | A1 |