Which method is NOT typically used for pressurizing refrigeration systems?

The method that is not typically used for pressurizing refrigeration systems is the use of excess refrigerant. In refrigeration practices, the primary goal is to maintain system integrity and avoid contamination or damage. Using excess refrigerant could lead to over-pressure situations, which can be dangerous and potentially harmful to components of the system, and it does not provide a safe way to test or pressurize the system.

In contrast, controlled hot water, dry nitrogen, and air compressors are preferred methods for pressurizing refrigeration systems. Controlled hot water can create a uniform pressure while heating components to aid in the testing process. Dry nitrogen is commonly used because it is inert, non-flammable, and does not contribute to the overall refrigerant charge, making it ideal for leak testing. An air compressor can be used, but care must be taken, as it can introduce moisture into the system, which can create issues if not properly managed.

Understanding these methods highlights the importance of safety and efficiency in refrigeration system maintenance and testing, ensuring that technicians use appropriate practices to avoid system failure or environmental hazards.