EPA regulations state that removal of which component constitutes a "major repair"?

The correct answer is the compressor, as its removal is classified as a "major repair" under EPA regulations. This classification stems from the compressor's critical role in the refrigeration cycle, where it compresses refrigerant and circulates it throughout the system. Because the compressor is a fundamental component that directly impacts the efficiency and operational integrity of the entire system, any service involving its removal requires stringent handling procedures to prevent refrigerant leakage into the environment.

Major repairs, as defined by the EPA, often involve significant disassembly or replacement of key components that can lead to the release of refrigerants. The compressor's complexity and connection to the refrigerant circuit underscore the importance of following proper protocols during its removal and replacement to comply with environmental regulations and ensure safety.