What is the main purpose of a purger in an NH3 system?

The main purpose of a purger in an ammonia (NH3) refrigeration system is to remove non-condensable gases. Non-condensable gases, such as air or other impurities, can accumulate in refrigeration systems and hinder the system's efficiency by reducing the heat exchange capability and causing pressure fluctuations. By eliminating these unwanted gases, the purger helps to maintain optimal operating conditions, ensuring efficient cooling and preventing potential damage to the system components. Thus, the correct answer effectively reflects the critical role of the purger in sustaining system performance and reliability.