What is the most efficient method of leak checking a charged low-pressure system?

The most efficient method for leak checking a charged low-pressure system is the controlled hot water or heater blankets method. This technique involves applying heat to the system, which causes any refrigerant present to expand. As the refrigerant expands, it will escape from any existing leaks, making it easier to detect. The heat also increases the pressure and temperature differential, potentially leading to more pronounced leak indicators.

When utilizing this method, technicians can observe changes in pressure readings or listen for sounds of escaping gas, which can be more straightforward to gauge in comparison to other methods that might not provide immediate feedback or require more extensive setup.

While other leak detection methods like ultrasonic detectors and soapy water solutions are useful, they may not provide the same immediate and clear indication of leaks as the heated method does, especially in low-pressure systems. The soapy water solution is quite common and effective but might not be as sensitive in all scenarios or for all sizes of leaks, especially if the leaks are minor. Similarly, ultrasonic leak detectors rely on sound, which can be affected by background noise or other factors.