Hanbell RC2-100AF, Manual

Page: 102 / 117

101
If the oil level in the oil separator above the compressor
’s oil inlet port, design a rise of oil line at the exit of oil
separator port is a must and the discharge gas line should initially run downwards. This can ensure that the oil or
liquid refrigerant won
’t be accumulated in the compressor after the compressor stops.
Discharge gas line design when inlet port of oil separator above the compressor level
Note: Because R404A and R507A have high vapor density, it is recommended using a muffler in the discharge
line after the compressor to avoid resonant vibrations.
For oil cooler, if it
’s water-cooled version, install the oil cooler below the level of compressor oil inlet or raise the oil
line between the cooler and compressor. If the oil cooler is an air-cooled version, the oil outlet of oil cooler should
be below the sight glass of the oil separator and also below the injection point of the compressor. In the case of
air-cooled oil cooler above the oil separator and compressor, the oil in the oil cooler will drain into the oil separator
during standstill. Thus, the oil separator will be overfilled and leads to higher oil carryover during next start.
Therefore, using a check valve with small spring force at the exit of oil separator is very important to prevent the oil
flowing back to the oil separator. Another way to ensure the fastest possible oil supply to the compressor on start
up is using a by-pass line to supply the oil to compressor from oil separator directly.
For parallel circuit of compressors, a discharge header between the discharge line and the oil separator is very
important. The discharge line should have sufficient falls to the discharge header to ensure free drainage in the
future. In order to protect the compressor away from backward running when it is not working, using a check valve
at discharge