Designed to be coupled with a variable-frequency drive and motor, I-Series achieves its peak efficiency to ensure maximum cooling capacity with minimum power. For users who may require minimal control options, the Mypro-IP panel is furnished on the screw compressor units. This compressor line has 50, 75 and 100 percent step loading and unloading like reciprocating compressors. The integral suction strainer and check valve facilitate ease of maintenance. Roller element bearings allow for differential oil low from startup. Therefore, no oil pump is required, reducing energy and maintenance. Less moving parts ensure more reliability in operation.