Which of the following methods is NOT typically recommended for leak testing low pressure refrigeration systems?

Submerging low pressure refrigeration systems in water is not typically recommended for leak testing due to several reasons. One primary concern is the risk of water entering vital components of the system, such as the compressor or electrical connections, which can lead to corrosion and potential failure of these components. Additionally, submerging a system could create an unsafe environment by introducing water into an area where refrigerants are present, potentially causing dangerous chemical reactions.

On the other hand, methods such as using a nitrogen charge, electronic leak detectors, and raising pressure through heating are more standard practices for leak testing. These methods help ensure that a system can be safely and effectively tested for leaks without compromising the integrity of the equipment. Using nitrogen, for example, allows for pressure testing without introducing moisture into the system, while electronic leak detectors are sensitive and effective at identifying even small leaks. Raising pressure through heating can help in identifying potential leak points by expanding materials, enabling better observation of where leaks might occur.