Hanbell RC2-F Series Manual

Hanbell RC2-F Series Manual Manual pdf 97 page image

968. System applications8.1 General applicationCompressor is the heart of the chiller/refrigeration system. To ensure a long trouble free operation, the followingdesign factors need to be considered during the design stage for the system designer.a. Oil circulationCompare with traditional reciprocating compressor using oil pump for oil circulation, Hanbell screw compressoruses pressure differential as the pushing force for oil circulation. To ensure the capacity control function and goodoil supply to compressor, minimum 4gcmkg 2/ pressure differential between main oil inlet port and suction sideis necessary. System designer should consider installing the necessary pressure sensors to get the pressurevalues at main oil inlet port and suction side and use them as reference to monitor the oil supply condition.For compressor working with R22 and HFC refrigerant, a general oil circulation diagram can be referred to thepicture below. The pressure drop at oil cooler and oil filter should be recorded as reference. Once the pressuredrop increases more than 12/ cmkg , regular maintenance on oil cooler and oil filter should be executed to ensuregood heat exchange at oil cooler and sufficient oil supply to compressor.Oil circulation design for R22 and HFC refrigerant