Where is the purge unit typically located in a low-pressure system?

The purge unit in a low-pressure refrigeration system is typically located at the top of the condenser. This positioning is crucial because it allows for effective removal of non-condensable gases that accumulate in the system. When these gases rise, they tend to collect at the highest points of the system, making the top of the condenser an ideal location for the purge unit to capture and expel them efficiently.

Additionally, placing the purge unit at the top ensures that any built-up pressure or gas can be properly vented without interfering with the normal operation of the refrigeration cycle. This design consideration helps maintain the system's efficiency and prevents potential harm to the compressor due to the presence of non-condensables.