Hanbell RC2-100AF, Manual

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8. System applications
8.1 General application
Compressor is the heart of the chiller/refrigeration system. To ensure a long trouble free operation, the following
design factors need to be considered during the design stage for the system designer.
a. Oil circulation
Compare with traditional reciprocating compressor using oil pump for oil circulation, Hanbell screw compressor
uses pressure differential as the pushing force for oil circulation. To ensure the capacity control function and good
oil supply to compressor, minimum 4
g cm kg
2
/
pressure differential between main oil inlet port and suction side
is necessary. System designer should consider installing the necessary pressure sensors to get the pressure
values 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 the
picture below. The pressure drop at oil cooler and oil filter should be recorded as reference. Once the pressure
drop increases more than 1
2
/ cm kg
, regular maintenance on oil cooler and oil filter should be executed to ensure
good heat exchange at oil cooler and sufficient oil supply to compressor.
Oil circulation design for R22 and HFC refrigerant