Final answer:
Recovery machines used with R-1234yf must meet specific certification requirements for safety and containment, such as having ignition-proof components and being certified following SAE J2843 standards due to the flammability of R-1234yf.
Step-by-step explanation:
Unlike most recovery machines in service today, recovery machines used with R-1234yf must meet specific certification requirements related to system safety and the containment of this relatively new refrigerant. R-1234yf is a low GWP (Global Warming Potential) hydrofluoroolefin (HFO) refrigerant designed to replace R-134a in automotive air conditioning systems.
Its chemical structure makes it considerably more flammable than its predecessor, necessitating recovery machines to have heightened safety features such as ignition-proof components and proper certification, like the SAE J2843 standard for R-1234yf Recovery and Recycling Equipment. This ensures that the machines can handle the refrigerant safely and minimize the risk of fire or explosion during the recovery process.