Hanbell RC2-D, Technical Manual

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RC2-D Technical Manual
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9. Operation Range
The operating range of compressor is related to the refrigerant used. It is very important to ensure
the compressor to operate within the operating range. Operating at too low suction temperature
may lead to the problems of lubricating oil viscosity and insufficient cooling of motor. Operating at
too high condensation temperature may reduce the service life of compressor due to insufficient
cooling of motor and compression chamber. Therefore, special attention should be paid to the
operating load and operating range of the compressor.
9.1 RC2-D Operation range
1. When compressor is under partial load or full load, the temperature of motor coil and discharge
gas will rise at the same time. In order to ensure the safe operation of, the use of the following
external cooling devices is necessary.
a) Oil cooler
b) Motor liquid injection cooling
c) Please select the appropriate external cooling device according to hanbell program. It is necessary to
install pressure difference switch or pressure maintaining valve to ensure that the oil pressure is 4bar
higher than the suction pressure to ensure that there is enough oil for sealing, lubrication and
capacity control.
d) For operating conditions outside the range, please contact hanbell.
2. It is suggested that the minimum value of discharge superheat should be kept above 30K of
condensing temperature (R22 discharge superheat is generally about 30K) to prevent liquid
injection backflow, which will cause compressor and lubrication failure.
3. The maximum suction superheat should be kept within 15K to prevent high temperature caused by
poor heat dissipation of motor and high discharge temperature.