2205B0JE-DA-J-N_2014.05.
3 Installation
Screw Compressor J-series
3.2 Installation Work
3-6
3.2.5.3 Equipment and Devices for Protection of the Compressor
Oil
Filter
According to the requirements of the use of the package unit or the standard to apply, install an oil
filter of appropriate filtration precision in the lubrication system of the compressor.
In the case of general applications such as closed-cycle refrigeration systems, we recommend to
use an oil filter with beta ratio in the range of
β
20
≥
150 that conforms to requirements of NAS 1638
class 8 or ISO 4406 17/15/13.
When the package unit requires API 619 4th/5th edition conformity, use an oil filter with beta ratio in
the range of
β
10
≥
200.
The oil filter may clog just after test operation. We recommend installing two oil filters in parallel.
This will enable replacement of either filter during operation.
Oil
Heater
Install an oil heater in the oil separator to ensure sufficient lubricant temperature before starting the
compressor. Make sure to install a protection function (thermostat, etc) to prevent overheating.
Suction
Strainer
When miscible oil is used, the mesh size of suction strainer should be 200 meshes or more, or
when non-miscible oil is used, the mesh size of suction strainer should be 100 meshes or more.
For miscible oil and non-miscible, refer to "4.2 Lubricant (Refrigerant Oil)" in this manual chapter 4.
During test operation, small particles and scale may come from the system. We recommend
installing a fine temporally filter or replace with new filters after test operation.
Economizer, Liquid Injection Line Filter
When an economizer or liquid injection is used, install a filter of 100
μ
m or finer in the line.
Compressor Protection Functions (Safety Device)
The J-series has a specified controller which must be used to protect the compressor with the
controller's protection functions.
Figure 3-3 A Specified Controller (example)
In addition, the following sensors are installed in the package to protect the compressor. For further
details such as sensor and controller settings, refer to the sensor and controller instruction manual.
Discharge temperature sensor (protection from abnormally high discharge temperatures)
