Hanbell RC2-100AF, Manual

Page: 98 / 117

97
If the oil pressure differential can
’t reach 4
2
/ cm kg
between main oil inlet port and suction side, an oil pump
should be assigned to build up the necessary oil pressure for oil circulation. User can follow the figure below for
design reference. In the oil pump section, an oil filter can be found before the oil pump. It is installed to protect the
oil pump away from debris and piping dirt. A pressure regulator can be seen parallel to the oil pump line. It is used
to control the maximum oil pressure. The function of check valve is letting oil pass through it when the oil pressure
is enough. Under such condition the oil pump won
’t need to work and oil can be supplied from the oil separator to
the compressor directly. The other function is to prevent back-flow of oil when oil pump works
Oil pump application
When the evaporator is far away from the compressor, system designer should consider designing proper suction
line to help the oil flow back from the evaporator. From the outlet of the evaporator, the suction line should always
drop vertically downward or run horizontally at a downward slope (1 cm per m) to a point where it then drops
vertically downward. When the line comes to a risen part, a trapping technique similar to that for the discharge line
is used. Please refer to the figure below for details.
Suction line design for risen part