Oil Separator; Protection Devices - mycom i125S Instruction Manual

1-5

Oil Separator

Oil separator has important two roles in the refrigeration system. One is to separate the lubricating oil
from discharge gas of the compressor, and the other is to hold the oil. When you design a oil separator
for the package unit using i-series compressor, take sufficient attention to the following points.
1) Installation of oil level gauge
To manage the lubricating oil level, an oil level gauge that shows both the upper and lower level
limit must be provided.
2) Installation of protection device from oil level decrease
In case of the oil supply by differential pressure, install a protection device from oil level decrease.
Since there is a possibility that alarm for protection from lubricating differential pressure decrease
may not activate even if the amount of lubricating oil is insufficient.
3) Sufficient stiffness
If a horizontal type of oil separator with the compressor and motor mounted on top is adopted, the
oil separator must be sufficiently rigidly designed considering the transformation and the thermal
strain of a separator casing.
Figure app.1-7 is an example flow with oil separator. Choose an appropriate oil separation method
(coalescer / demister / cyclone system) according to your refrigeration system conditions.
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Protection Devices

Package unit of the compressor requires protective devices to prevent damage to the components.
Install the necessary protective devices in accordance with applicable law.
Generally, as shown in Figure app.1-1, monitoring and control of pressure and temperature of
refrigerant, / oil, are required.
In addition, the range of operation, in accordance with applicable law, the installation of safety valve(s)
is also required.
Please refer also to Section 1.4 and Section 2.3.3 in this manual.
Screw Compressor i-series
Figure app.1-7
Appendix 1: Points of Single-package
Appendix 1-4
2203M4JE-MY-iS2-N_2017.04.