There has been a lot of discussion lately regarding the use of mildly flammable (A2L) refrigerants such as R-32 and R-454B in comfort cooling applications. These types of refrigerants are not permissible for use in commercial refrigeration equipment, but the flammable refrigerant, R-290 (propane), is allowed in small amounts (currently less than 150 grams in North America) and is widely used in many supermarkets, convenience stores, and restaurants.
Because R-290 is a flammable (A3) refrigerant, there are certain safety protocols that technicians must follow when servicing and repairing these refrigeration units. Some of these protocols are outlined below, but it is highly recommended that technicians receive specialized training before working on any equipment that utilizes flammable refrigerants.