Which of the following is NOT a method for minimizing refrigerant loss?

Using vacuum pumps incorrectly is not a method for minimizing refrigerant loss but rather can lead to increased losses. Vacuum pumps are critical tools used in the refrigeration process, especially during evacuation and recovery procedures. If they are used incorrectly—such as running them longer than necessary, failing to properly maintain them, or not following appropriate operational guidelines—this can compromise their efficiency and effectiveness. Consequently, this improper use can result in the unintended release of refrigerants into the atmosphere, which is detrimental to both the environment and compliance with regulations.

In contrast, the other options—properly sealing all connections, regular maintenance on recovery equipment, and following safe recovery procedures—are essential practices that effectively help to minimize refrigerant losses. Proper sealing prevents leaks at connection points; maintaining recovery equipment ensures it operates efficiently without unnecessary losses; and adhering to recovery procedures ensures that refrigerants are handled and disposed of safely, further mitigating any risk of loss. Therefore, the incorrect application of vacuum pumps stands out as a significant point of failure in the context of refrigerant management.