2200M4JE-HO-iS2-N_2014.04.
Chapter 3 Installation
Screw Compressor i-series
3.2 Installation Works
3-4
Suction
Strainer
When miscible oil is used, the mesh size of suction strainer should be not less than 200 meshes.
When non-miscible oil is used, it should be not less than 100 meshes.
For details about miscible and non-miscible oils, refer to section 4.1 "Lubricant (Refrigerant Oil)" in
this manual.
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 100
μ
m 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 Lubricant
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 lubricant, 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 lubricant does not absorb air moisture, keep it indoors in an airtight
container until use.
3.2.7.1 Initial Charge of Lubricant
At initial commissioning or after periodical inspection, the compressor's moving parts such as bearings
and mechanical seals may not be sufficiently lubricated. So, charge the compressor with lubricant
according to the following procedure.
1.
Thoroughly evacuate the compressor and oil separator (approximately 40 Torr).
2.
Open the downstream side valve of the oil filter, and charge 10 liters of lubricant from the oil
supply port.
3.
Turn the compressor's rotor shaft.
4.
Close the downstream side valve of the oil filter.
5.
Open the upstream side valve of the oil filter, and charge lubricant to the oil separator until it
reaches the specified level.
