ANSI AHRI-580-2009 pdf download Non-Condensable Gas Purge Equipment For Use with Low Pressure Centrifugal Liquid Chillers
D1.1 Purges that contain adsorptive/absorptive media (referred to later as media) have special rating and listing requirements. If the purge contains media that is a replaceable component or the regeneration of the media is manually controlled, the purge shall be tested and rated both with and without the media in the system. In addition, the purge instructions supplied by the manufacturer with the purge shall contain the Refrigerant Holding Capacityof the media, and will indicate to the purge operator a measurement that shall be used to determine when the media must either be changed (for a replaceable component) or regenerated (for a manually regenerated component). For media that is manually regenerated, the Refrigerant Holding Capacity will represent the amount of refrigerant added to the media between regeneration cycles. Purges that contain media that is automatically regenerated (no operator interaction required) do not have to be rated without the media.
When the purge is tested with the media installed, regardless of whether the media is replaceable or regenerated manually or automatically, the media shall be brought to a normal operating state prior to a rating test. Specific requirements for each of the media regeneration types are detailed below.
D1.1.1 Purges that contain replaceable media – The manufacturer’s operating instructions shall specify the Refrigerant Holding Capacity of the media. The purge is tested and rated both with and without the media. Prior to testing the purge with media installed, the media is loaded with the amount of refrigerant specified by the manufacturer as the Refrigerant Holding Capacity of the media in the operating instructions supplied with the purge system. The refrigerant is loaded to the media as specified below.