What refrigerant does this unit use and what safety concerns should I know?

This unit uses R32 refrigerant, which should be treated with care and handled properly to prevent frostbite, cardiac arrhythmia, and environmental damage (Page 5). The charge amount must strictly follow the manufacturer specifications, local codes, and safety requirements based on your room's floor area (Page 5). A stop valve cover must be installed to prevent possible refrigerant leaks (Page 5).