Final answer:
Refrigerant servicing does not require Section 608 certification when dealing with small appliances that contain less than 5 pounds of refrigerant or purchasing refrigerant intended for use in motor vehicle air conditioners. However, actual servicing of these systems generally requires certification.
Step-by-step explanation:
The U.S. Clean Air Act requires that technicians who maintain, service, repair, or dispose of equipment that could release refrigerants into the atmosphere must be certified under Section 608. However, there are exceptions where Section 608 certification is not required. One such exception involves the servicing of small appliances, which contain less than 5 pounds of refrigerant.
Additionally, the purchase of refrigerant that is intended for use in a motor vehicle air conditioner (MVAC) also does not require the purchaser to be Section 608 certified, but certification is required for technicians who perform service, maintenance, repair, or disposal of an MVAC system or containers.
Servicing of industrial process refrigeration, or comfort cooling, or commercial refrigeration equipment may not require certification if it does not involve the release of refrigerant into the atmosphere, although good practice and regulations may require capture and proper disposal regardless of the requirement for certification.