Sullair Systems Refrigerated Air Dryer. Model: PDC-400 AC. S/N: 003-D2151. Maximum pressure: 125 psi. Air cooled. Refrigerant: R-12 or R-22. Scroll Compressor Model: AH303TT-196. Compressor specifications: 1/20 hp, 4.5 RLA, 24 LRA, test pressure: 150 psi (lo side), 300 psi (hi side). Condenser dimensions: 31 in. L x 1-1/2 in. W x 18 in. H, with 15 fins per inch. Normal operating conditions (R-12): suction pressure: 27 to 30 psi, head pressure (max): 180 psi. Normal operating conditions (R-22): suction pressure: 54 to 60 psi, head pressure (max): 260 psig. Heat exchanger dimensions: 4-1/2 in. dia. x 29 in. L. System requirements: 460 V, 60 Hz, 3 phase. Manual/automatic dryer switch. Sight glass is green when dry and yellow when wet. Air inlet/outlet: 2-1/2 in. threaded male. Overall dimensions: 56 in. L x 29 in. W x 40 in. H.