Hanbell RC2-F Series, Manual

Page: 35 / 117

34
b. Application limits of of RC2-1020F~RC2-1530F are described on the respective refrigerant charts.
Note :
1. When Hanbell screw compressor operates in partial or full load within limits, temperature of motor coil and
discharge will rise concurrently. In order to keep compressor running safely, Hanbell recommends using the
following additional cooling methods :
(1) Oil cooler. (2) Liquid injection to chamber. (3) Liquid injection to motor.
Please refer to Hanbell selection software for calculation and chapter 9
—application for design reference.
2. The minimum discharge superheat is recommended to be kept 10°k higher than the condensing temperature
( normally discharge superheat is around 20°K for R-134a,R404A, R507A and 30°K for R22, R407C) to avoid
liquid filling back to compressor and lubrication failure. According to EN12900, the minimum suction
superheat is 10°k and liquid sub-cooling is 0°k.