2205Q2JE-HO-S6-N_2020.01.
Chapter 2 Compressor Specifications and Structure
SCV-series Screw Compressors 2.3 Compressor Specifications
2-6
2.3.2 Operation Limits
Table 2-6 Operation Limits of SCV-series Screw Compressors
Maximum discharge pressure
Minimum differential pressure
between discharge pressure and
MPa 0.49
Maximum oil supply pressure MPa
Differential pressure oil supply
Pd + 0.39
Pd
（＝
）
Minimum oil supply pressure MPa
Differential pressure oil supply
Maximum suction temperature
Minimum suction temperature
Maximum discharge temperature
Maximum oil supply temperature
Minimum oil supply temperature
Maximum M rotor rotation speed
-1
4500 (250VLL and 320V*D are 3600)
Minimum M rotor rotation speed
-1
Note 1: Unless otherwise noted, the pressure unit MPa represents the gauge pressure in this manual.
Note 2: The oil supply pressure of the capacity control part (control hydraulic pressure of the unloader
slide valve), the value of the forced oil supply pressure is applied.
Note 3: When it is required that pressure difference between Pd (discharge pressure) and Ps (suction
pressure) should be not greater than 0.49 MPa, oil pump needs to be installed.
If a combination of "NH
3
+ compatible oil (PN46)" is used for working fluid (refrigerant) and
lubricating oil, oil pump must be installed.
If operation at partial load, which is not greater than 30 % of the indicated load, is
continued for a long time except when starting up the machine, abnormal noises
or vibration may be generated. So avoid such operation.
Repeated startup and stop in a short period is harmful not for the startup devices
and electric machinery but also for the compressor itself. For information on the
start/stop limitations, refer to each instruction manual. Wait at least 15 minutes
after stopping the compressor before restarting it.
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