Which of the following is an indication of an ammonia leak in a refrigeration system?

The presence of a strong, pungent odor is a key indication of an ammonia leak in a refrigeration system. Ammonia is known for its distinctive, sharp smell, which can be detected even at low concentrations. This characteristic odor is a critical safety feature because it alerts operators to a potential release of the gas, allowing them to respond quickly to mitigate hazards.

In refrigeration systems, ammonia is a commonly used refrigerant, and recognizing the early signs of a leak is vital for both safety and efficiency. The odor serves as an immediate warning, prompting operators to take necessary actions such as evacuating the area, ventilating the space, and initiating repair protocols.

Other indicators, such as unusual noise from the compressor, rapid fluctuation in pressure gauges, or excessive frost build-up, can hint at issues within the refrigeration system but are not specific to ammonia leaks. These symptoms could signify mechanical problems or other types of refrigerant leaks, making the presence of the odor the most reliable and direct sign of ammonia escaping from the system.