Which air conditioning systems components must be approved or certified for use In an HFO-1234yfb systems?

In HFO-1234yf-based air conditioning systems, key components that must be approved or certified include the compressor, evaporator, condenser, and expansion device. These components must be compatible with the chemical properties of HFO-1234yf, particularly its low flammability and pressure characteristics. Additionally, refrigerant hoses and seals must also be specifically rated for use with HFO-1234yf to ensure safe and efficient operation. Compliance with relevant safety and environmental standards is crucial for all components.