In processing plants across the country, low pressure chillers are hard at work satisfying process cooling requirements. Proper maintenance, including purging, is required to keep them operating effectively.
The most important criteria for any high efficiency purge system is its efficiency level. The only assurance one has that a particular manufacturer's purge unit will perform to its published efficiency rating is to make absolutely sure the unit is Air-Conditioning and Refrigeration Institute (ARI) certified to Standard 580. The ARI-certified, tested refrigerant-to-air-emission ratio should be below 0.6 lb of refrigerant per pound of air purged. Make sure this is the certified efficiency of the purge unit alone, without the aid of secondary absorption media.