1993 Phoenix 54 Ton Rack System. Model: PS322PLRA, S/N:PS3370D083093. (3) Copeland compressors: (1) 10- ton, (2) 22- ton. Chiller barrel: National Board No: 318893, Model: 10968. MAWP: 400 psi @ 150 °F; MDMT: -20 °F @ 400 psi. (1) Insulated suction accumulator tank: 10 in. dia x 18 in. H. Discharge oil separator tank: Certified by Conyers Tank & Welding, S/N: 2179. MAWP: 400 psi @ 150 °F; MDMT: -20 °F @ 400 psi. (12) Alco Evaporator Pressure Regulators. Overall dimensions: 11 ft. L x 39 in. W x 87 in. H. The rack, if rated at -35 °F for a -10 °F freezer could go to -50 °F for a -35 °F blast. The unit would probably do 25 tons at that low condition.