Motor Vehicle Air Conditioner (MVAC) -
Mechanical vapor compression refrigeration equipment used to cool the driver or passenger compartment of any motor vehicle. This definition is NOT intended to encompass the hermetically sealed refrigeration system used on motor vehicles for refrigerated cargo or the air conditioning systems on passenger buses.Section 609 certification is required for working on MVAC systems while either Section 608 Type II or Section 609 certification is required for MVAC-like A/C systems (e.g., farm equipment and other non-roads vehicles). Section 608 certification is required for working on hermetically sealed refrigeration systems used on motor vehicles for refrigerated cargo or the air conditioning systems on passenger buses. Due to the similarities between MVAC and MVAC-like appliances, EPA recommends that technicians servicing MVAC-like appliances consider certification under Section 609. Note that buses using CFC-12 or HFC-134a to cool the driver are MVACs. However, buses using HCFC-22 are not MVACs or MVAC-like appliances, but rather high-pressure equipment covered under by Section 608 certification. Therefore, if you service both the driver AC system (MVAC) and the passenger AC system, both a 609 MVAC and a 608 certification are required. Likewise, if you service the AC system for the cab of a truck (MVAC) as well as the refrigerated cargo container then again, you need both 609 MVAC and 608 certifications.