Hansen Technologies AP08 Auto Purger. Model: AP08. Number of purge points: 8. Refrigerant: R-717 (ammonia). Power supply: 120 V. Evaporator Chamber. Receiver - 1.5 Gallon, straight-wall dimensions: 5 in. dia. x 1 ft. 8 in. L. Hoffman Control Panel. The Auto-Purger features automatic startup with electronic controls, automatic water bubbler, relief valve, and an isolation service valve. This unit quickly and efficiently removes air from a refrigeration system which reduces the energy costs of operating an ammonia refrigeration system. Includes. Overall dimensions: 4 ft. 7 in. L x 3 ft. 1 in. W x 1 ft. 5 in. H.(ACN95a). (BG) Cont-17.