What air condirionjng system components must be approved or certified in use for HFO-1234yf system?

For HFO-1234yf air conditioning systems, components that must be approved or certified include the refrigerant itself, the compressor, heat exchangers, and any hoses or seals that come into contact with the refrigerant. Additionally, the oil used in the system must be compatible with HFO-1234yf. These components must meet specific safety and performance standards to ensure safe operation and to minimize environmental impact. Compliance with regulatory standards, such as those from the SAE (Society of Automotive Engineers) and other relevant bodies, is also essential.