Equipment And Devices For Protection Of The Compressor; Airtightness Test; Lubricating Oil Charge - mycom i125S Instruction Manual

3.2.5.2 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
class 8 or ISO 4406 17/15/13.
The oil filter may be clogged just after the commissioning. We recommend installing two oil filters in
parallel. This will enable replacement of either filter during operation.
 Oil Heater for Oil Separator
To preserve the temperature of the lubricating oil before starting the compressor operation, install
an oil heater on the oil separator. In cold districts, install a band heater to the oil supply piping.
Make sure to install a protection function (thermostat, etc.) to the heater to prevent overheating.
 Suction Strainer
The i-series compressor has built-in suction strainer. The same strainer elements are used for both
models of the i125* and i160*. The mesh size of strainer element is 150 meshes.
During commissioning, small particles and scale may come from the system. We recommend to
install a finer filter temporarily.
 Line Filter for Economizer/Aquamizer (Liquid injection)
When using an economizer or/and aquamizer (liquid injection), install a filter with filtration accuracy
of not higher than 100μm within the line.
 Compressor Protective Devices (Safety Devices)
Install the necessary protective devices, referring to Section 1.4.3 "Compressor Protective
Devices" and Section 2.3.3 "Alarm Setting Values", in this manual.
3.2.6

Airtightness Test

Before commissioning, perform an airtightness test on the refrigerating/cold storage package unit.
Use the design pressure of the refrigerating unit as the test pressure. Keep that pressure for at least 30
minutes, and perform a leak test on the connecting/jointing parts like flanges by using leakage
detection liquid (soapy water, etc.).
3.2.7

Lubricating Oil Charge

 In the packaging of the refrigerating unit, install two valves at the front and the rear of
an oil filter. Install an oil charge port between the oil filter and the upstream side valve.
 When refilling lubricating oil, ensure that it is clean and does not contain foreign
matters.
 Be careful that air and water are not mixed in when refilling.
 To ensure that the lubricating oil does not absorb air moisture, keep it indoors in an
airtight container until use.
Screw Compressor i-series
≥ 150 that conforms to requirements of NAS 1638
20
3-4
2203M4JE-MY-iS2-N_2017.04.
Chapter 3 Installation
3.2 Installation Works