Where is the ideal location to manually purge noncondensibles from a refrigeration system?

The ideal location to manually purge noncondensibles from a refrigeration system is from the highest point of the condenser, with the compressor off. This is because noncondensibles, such as air or other gases, tend to accumulate at high points in the system due to their lower density compared to the refrigerant. When noncondensibles are present, they can lead to reduced efficiency in the system and can cause issues like high head pressure.

By purging from the highest point, the noncondensibles can be removed effectively without disrupting the operation of the compressor. Turning off the compressor during this process is crucial; it prevents the compressor from drawing in any air or noncondensibles while the purge is taking place. This approach ensures that the refrigeration system maintains optimal performance and efficiency.

Purging noncondensibles from other locations, such as the lowest point of the condenser or near the evaporator outlet, would not be effective, as those areas are less likely to have accumulated noncondensibles and may not facilitate proper purging. The compressor discharge line is also not ideal because it can create additional pressure and strain on the system, potentially leading to inefficient operation or equipment damage.