Used 150 Ton CO2 / R-22 Cascade System Refrigeration Unit, Manufactured by York Refrigeration / Frick. Unit uses Frick screw cooling d-Limonene in a flooded evaporator from -29.6oF to -49oF. Refrigerant vapor is compressed by (2) 400 HP Frick Model RXF-101E oil injected rotary screw compressors (Serial # TDSH193L3178D2 (Stock #6301) and Serial # TDSH193L3177D2 (Stock #6300)). R-744 is compressed by (1) 250 HP Frick Model RXF-39 oil injected rotary screw compressor (Serial #XJF151A0258A). Built 2001.