Why Purge Units Are Needed
Low-pressure chillers frequently operate at or below atmospheric pressure, which means air and moisture leak into the system through any opening rather than refrigerant leaking out. Air is a non-condensable gas that accumulates at the top of the condenser. A purge unit automatically removes these non-condensable gases. Without a functioning purge unit, the air buildup raises head pressure, reduces system capacity, and increases energy consumption.
Systems operate at/below atmospheric pressure, so air leaks IN through any opening. Purge units remove non-condensables from the top of the condenser.
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