The impact of the 2018 F-Gas phase down step means it is imperative that the use of lower GWP refrigerants grows rapidly. The mildly flammable A2L refrigerants with their low GWP meet this requirement and their use in new systems is growing.
An A2L refrigerant by definition means it has a burning velocity below 10cm/sec. The Heat of Combustion (HOC) and Minimum Ignition Energy (MIE) are also much lower than A3 refrigerants.
When using A2L refrigerants in stationary applications it is important to follow the requirements laid down in EN378. Handling the mildly flammable refrigerants requires knowledge of their properties and relevant precautions that should be taken based on equipment manufacturers guidelines. Those already trained to handle Ammonia and Hydrocarbons will have had relevant training that can be applied to A2L refrigerants. Always refer to the safety data sheets for each refrigerant.
A2L refrigerants should not be used for retrofitting systems containing an A1 non-flammable refrigerant.