Hanbell RC2-AV Series, Руководство пользователя

Страница: 10 / 62

9
2.9 Application limits
Application limits of the compressor vary significantly with the type of refrigerant used. The application limits shown below are
based on saturated suction and discharge operating conditions, for continuous operation over extended periods of time. It is
important to operate within these limits to maintain proper compressor life. Operating at extra low saturated suction temperature,
may cause oil management and motor cooling problems, while operating at extra high saturated condensing temperature will
shorten the compressor life due to insufficient motor and compressor chamber cooling.
Application limits of RC2-100AV~RC2-1530AV
Note:
1. When Hanbell screw compressors operate at partial or full load within application limits, motor coil and discharge
temperature will rise simultaneously. In order to keep compressor running safely and continuously, Hanbell
recommends the following additional cooling devices:
(1) Oil cooler or
(2) Liquid injection to chamber or
(3) Liquid injection to motor
Please use Hanbell selection software to get recommended additional cooling capacity.
2. Hanbell recommends monitor oil pressure and keep it 4 kg/cm
2
g over the suction pressure for adequate seal,
lubrication by pressure differential switch. Oil pump could be applied especially under operation conditions with low
condensing temperature and high evaporating temperature such as flooded water-cooled chillers whose high-low
pressure differential tends to be less than 4kg/cm
2
g. Contact Hanbell to verify potential operating conditions
outside the application limits shown above.
3. The minimum discharge superheat is 10K higher than the condensing temperature (normally discharge superheat
is around 20K) to avoid liquid returning to compressor and lubrication failure.