Royce 12-Cylinder Reciprocating Compressor-120 Ton. Model: CG120 P0A. S/N: IV6145. Nominal Rating: 120 Ton. Refrigerant: R-22, R-502, R-12. Test pressure: 415 psig. Shaft diameter: 2 in. Inlet: (1) 4-1/8 in. dia. flanged port. Outlet: (1) 3-1/8 in. dia. flanged port. The Model CG compressors are designed for air conditioning and refrigeration operations. They are external drive type and designed for direct drive applications with operating speeds of 1000 to 1800 rpm. Overall dimensions: 3 ft. 10 in. L x 2 ft. 4 in. W x 2 ft. 1 in. H. (H11)(ACN435).