Which method is commonly used to leak-test refrigerant tubing?

The method of using dry nitrogen to leak-test refrigerant tubing is widely accepted and practiced in the HVAC industry for several reasons. Dry nitrogen is an inert gas, meaning it does not react with the refrigerants or materials commonly used in HVAC systems, ensuring that no chemical reactions occur that could damage the tubing or components.

When conducting a leak test, dry nitrogen is pressurized inside the system, and any potential leaks can be detected by monitoring pressure changes or using soapy water to identify escaping gas bubbles at connections and joints. Its non-corrosive nature prevents any potential damage to the system, and it is also readily available and relatively inexpensive compared to other gas options.

Furthermore, using dry nitrogen is safer than alternatives such as compressed air, which can contain moisture and contaminants that may cause corrosion inside the tubing. Unlike water pressure testing, which can be unsuitable for refrigerant lines that may not handle the pressures involved, dry nitrogen testing provides a safe and effective means to ensure system integrity without introducing risk factors associated with liquid pressures or reactive gases.