Kaeser Air Dryer. Model: KRD-500. S/N: 0311A-3-9005-50K. Capacity: 500 SCFM. MAWP: 100 psi at 100 °F. Temperature range: 35 °F/110 °F. Refrigerant: R-22. Compressor, Model: AH302TT-104. Evaporator dimensions: 30-3/4 in. L x 2 in. W x 36 in. H; 10 fins/in., (2) fan motors. Controls: on/off switch, temperature in/out and evaporator regulators. Air inlet/outlet: 2 in. threaded (male), automatic condensate drain: (2) 1 in. threaded (male). Overall dimensions: 36 in. L x 36 in. W x 73 in. H.