The I-Series screw compressor has a capacity of 55.5 to 116.9 tons of refrigeration. It can operate with anhydrous ammonia or R-22. It is available in 160-mm rotor diameter and 180-mm rotor length. The iP control panel is made for this compressor using the company's Yosaku liquid injection system. An optional RS-485 communication port with read/write capability is available for PC communication via the company's protocol and Modbus. The compressor package can be designed for the optional variable-frequency drive system. No oil pump is required; oil pressure is generated by suction/discharge pressure differential.