Which of the following is not considered a major maintenance service or repair under EPA guidelines?

The option that is not considered a major maintenance service or repair under EPA guidelines is replacing an oil filter. The EPA defines major maintenance services as those that significantly impact the refrigerant circuit and the overall system’s ability to perform effectively. Actions like replacing a compressor, installing a new evaporator coil, and repairing refrigerant leaks involve significant alterations to the refrigeration system, which may result in changes to refrigerant levels or the integrity of the system, and therefore fall under the EPA's regulations for handling refrigerants.

In contrast, replacing an oil filter is a routine maintenance task that does not have the same level of impact on refrigerant management or system integrity. While it is important for the overall performance of the system, it does not involve direct interaction with the refrigerant circuit and thus does not necessitate the same regulatory considerations that more significant repairs or installations do. This distinction is crucial for understanding what activities require adherence to EPA guidelines regarding refrigerant handling and management.