What is an acceptable method for pressurizing a refrigerant system?

Using clean, dry nitrogen to pressurize a refrigerant system is an acceptable method because nitrogen is an inert gas that does not react with the refrigerants or oils found in the system. This characteristic ensures that the integrity of the refrigerant and the system components is maintained, preventing contamination and potential chemical reactions that could lead to damage or inefficient operation.

Additionally, nitrogen is non-flammable and provides a safe means of introducing pressure to identify leaks or to perform system maintenance without the risks associated with using reactive or flammable gases. Other methods, such as using water, could lead to corrosion or freezing issues; using hydrogen could present flammability hazards; and using air introduces moisture that can cause acid formation and corrosion in the system.