Which type of repair is classified as "major" under EPA's regulations?

The classification of a repair as "major" under EPA regulations typically involves significant changes to the refrigerant system that not only impact its operation but also its integrity and performance. The replacement of an evaporator coil is considered a major repair because it involves removing and replacing a significant component of the refrigeration or air conditioning system. This type of repair can also lead to a substantial disturbance in the refrigerant circuit, necessitating adherence to specific leak repair and refrigerant handling procedures to prevent environmental harm.

In contrast, replacing a filter dryer, sealing small leaks, and changing the oil in the compressor are tasks categorized as minor repairs. These actions usually do not involve extensive manipulation of the system's structure or refrigerant flow, thus they fall under a lesser regulatory burden. Major repairs, such as the replacement of an evaporator coil, require adherence to stricter guidelines for refrigerant management and handling.