mycom 280J

2205B0JE-DA-J-N_2014.05.
Table of Contents
Screw Compressor J-series
vi
2.5 Mechanisms ............................................................................................... 2-24
2.5.1 Basics of the Screw Compressor ................................................................... 2-24
2.5.2 Suction Process .............................................................................................. 2-25
2.5.3 Compression Process .................................................................................... 2-25
2.5.4 Discharge Process .......................................................................................... 2-25
2.6 Oil Flow ....................................................................................................... 2-26
2.7 Capacity Control Characteristics ............................................................. 2-27
2.8 Variable Vi Control ..................................................................................... 2-28
2.8.1 Vi (Internal Volume Ratio) .............................................................................. 2-28
2.8.2 Reasons for Adjusting Vi According to Operating Conditions ........................ 2-29
2.8.3 Details of Variable Vi Mechanism ................................................................... 2-29
2.8.3.1 Automatic Variable Vi Mode ...................................................................... 2-29
2.8.3.2 Fixed Vi Mode ............................................................................................ 2-30
2.8.4 Vi Position Sensor .......................................................................................... 2-30
2.9 Solenoid Valve ........................................................................................... 2-31
2.9.1 170J/220J-series ............................................................................................ 2-31
2.9.2 Explosion Proof for 170j/220J-series, Also 280J-series ................................. 2-33
3 Installation
3.1 Precautions for Installation ......................................................................... 3-1
3.2 Installation Work .......................................................................................... 3-2
3.2.1 Unpacking ......................................................................................................... 3-2
3.2.2 Storage ............................................................................................................. 3-2
3.2.3 Transfer ............................................................................................................ 3-2
3.2.4 Preparation for Installation ................................................................................ 3-3
3.2.5 Installation ......................................................................................................... 3-4
3.2.5.1 Installation .................................................................................................... 3-4
3.2.5.2 Piping ........................................................................................................... 3-5
3.2.5.3 Equipment and Devices for Protection of the Compressor ......................... 3-6
3.2.6 Pressure Test (Leak Test) ................................................................................ 3-7
3.2.7 Lubricant(Refrigerant Oil) Charge .................................................................... 3-7
3.2.7.1 Initial Charge of Lubricant............................................................................ 3-7
3.2.7.2 Additional Charge of Lubricant Procedure .................................................. 3-8
3.2.8 Charging of Refrigerant .................................................................................... 3-8
3.2.9 Check after Installation ..................................................................................... 3-8
3.3 Documents Related to Installation ............................................................. 3-9
4 Compressor and Package Operation
4.1 Adjustment before Test Operation ............................................................. 4-1
4.1.1 Adjustment of Unloader Slide Valve and Variable Vi Slide Valve .................... 4-1
4.2 Lubricant (Refrigerant Oil) .......................................................................... 4-2
4.2.1 Precautions for Selecting the Lubricant ............................................................ 4-2
4.2.2 Recommended Lubricant ................................................................................. 4-2
4.2.3 Change of Lubricant Brand ............................................................................... 4-4
4.2.4 Precautions for Handling Lubricant .................................................................. 4-4
4.2.4.1 Precautions for Handling Polyalkylene Glycol (PAG) .................................. 4-4