2200LZJE-HO-C6-N_2013.12.
Chapter 2 Configuration and Specifications of Compressor
Compound 2-stage Screw Compressor 2016**C
2.3
Compressor Specifications
2-3
2.3.2 Operation
Limits
Table 2-2 Operation Limits of 2016**C
Items
Operation Limits
Remarks
Maximum discharge pressure
1.96 MPa *Note 1
Casing design pressure: 2.6 MPa
Minimum suction pressure
-0.080 MPa
Shaft seal, inherent properties
Maximum intermediate
pressure
0.588 MPa
Bearing
Minimum intermediate pressure
> Suction pressure
Recommended condition:
> Suction pr 0.1 MPa
Oil supply pressure
Ps: Suction pressure, Pd: Discharge pressure
1) Journal lubrication
pressure
Pd + (0.049 to 0.39)
MPa
Balance piston lubrication
(Pressure lubrication)
2) Bearing and oil injection
minimum lubrication
pressure
Ps + 0.49 MPa
*Note 2
Check valve must be installed.
3) Balance piston minimum
lubrication pressure
Pd + 0.049 MPa
Suction temperature
max. 85
°
C
min. -60
°
C
Clearance allowed between rotor and
casing Casing design
Maximum discharge
temperature
Low-stage
90
°
C
High-stage
100
°
C
Clearance allowed between rotor and
casing
Maximum oil supply
temperature
60
°
C
Oil viscosity should be not less than
13mm
2
/s.
(Optimally, oil viscosity should be between
13 and 40 mm
2
/s.)
Minimum oil supply temperature
30
°
C
Oil viscosity should be not higher than
60mm
2
/s.
Maximum M rotor rotation
speed
4000 rpm
Bearing, inherent properties, seal
Minimum M rotor rotation speed
1450 rpm
Bearing
Note 1: Unless otherwise noted, the pressure unit MPa represents the gauge pressure in this manual.
Note 2: When it is required that pressure difference between Pd and Ps 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.
