What is the most efficient way to leak check charged low-pressure refrigeration machines?

The most efficient way to leak check charged low-pressure refrigeration machines is by raising system pressure using heated water or blankets. This method works effectively because it increases the pressure inside the system, which can help to identify leaks more readily. When the pressure is raised, any leaks present could allow refrigerant to escape, making it easier to detect where the leak is occurring.

Using heated water or blankets ensures that the system is evenly heated, helping to operate at a higher pressure accurately. The increase in pressure causes refrigerant vapor to escape if there is a breach, providing a clear indication of a leak's location.

While electronic leak detectors and visual inspections for oil stains are commonly used methods, they may not be as reliable in identifying all types of leaks, especially in low-pressure systems where refrigerant vapor might not produce sufficient signs for detection without the aid of increased pressure. Injecting nitrogen is another technique that can be useful, but heating the system tends to be more effective in producing a noticeable change in pressure suitable for leak detection in refrigeration systems.