2004 Krack 2-Fan Ammonia Evaporator Blower. Model: PCNS2S-388-4-1.5RBA-IHGC-RH-30. Approximate capacity rating: 14 tons, as originally designed for a 28°F room with an 18°F evaporation temperature and a 10° drop in temperature. Refrigerant: recirculated R-717 (ammonia). Type: Design psig: 302. Defrost: hot gas. Tube material of construction: galvanized steel. Number of fans: 2. Fan diameter: 30 in. Fin material of construction: galvanized steel. Fins per inch: 4. (2) Baldor industrial motors, 1-1/2 hp, 1185 rpm, 208-230/460V, 60 Hz, 3 phase. Inlets: (1) 2 in. dia. port. Outlets: (1) 1-1/2 in. dia. port. Overall dimensions: 12 ft. 4 in. L x 4 ft. 3 in. W x 3 ft. 8 in. H.(ACN119).(BK).