Where should an auto purger be piped from on the condenser?

The correct choice is to pipe the auto purger from the outlet drain of the condenser. This configuration ensures that any non-condensable gases or accumulated contaminants can be effectively removed from the system. By connecting the auto purger at the outlet drain, the system can maintain optimal operation and efficiency as it allows for continuous expulsion of these undesired elements, which can otherwise compromise the performance of the condenser and the overall refrigeration cycle.

The outlet drain captures and expels vaporized refrigerant that has been condensed, making it the ideal location for the auto purger. This helps to prevent potential issues such as reduced capacity or increased energy consumption that can arise if non-condensables are allowed to accumulate within the condenser.