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Design and function
3
January 2017
America
21 /72
No.
Designation
No.
Designation
No.
Designation
2
Suction regulator; resid-
ual pressure 1 - 1.5 bar /
15 - 22 psi
14
Pressure reducing valve 28
Cooling water solenoid
valve (Y) (only L xxxW)
2.1
Adjusting cylinder
15
Pressure retention and
check valve
Opening pressure
4 - 4.5 bar / 58 - 65 psi
29
Adjustable throttle valve
(only L xxxW)
2.2
Throttle
16
Aftercooler compressed
air
30
Check valve
3
Electric motor
17
Cooling air fan (after-
cooler)
31
Frequency converter
L160RS - L290RS;
Optional
4
Screw compressor
18
Final compression pres-
sure sensor (B2)
32
Motor lubrication system
E4/E5
5
Final compression tem-
perature sensor (R2)
19
3/2-way solenoid valve
(regulator valve) (Y1)
33
Oil suction non-return
valve
6
Pressure vessel
20
Blow-off valve (Y4)
34
Motor temperature moni-
toring (R1)
7
Fine precipitator
21
Oil temperature regu-
lator; opening starts at
55 °C / 131 °F
35
Line pressure sensor (B1)
8
Oil drain
22
Oil level indicator
9
Safety valve
23
Suction filter monitoring
(S7); optional
Switching point 50mbar /
20 in H
2
O
10
Oil filter monitoring (S5);
optional
Switching point 2.2 bar /
32 psi
24
Fine separator monitor-
ing (S6); optional
Switching point 1.2 bar /
17 psi
11
Oil filter
25
Speed-controlled cooling
air fan (oil cooler)
12
Oil cooler
Chart 3-2: Components
3.4
Oil circuit
At oil temperatures below 55°C / 131°F, the oil
flows from the pressure vessel (-6-) through the
cooler bypass pipe directly to the oil filters (-11-)
and is then injected into the screw compressor
(-4-).
If the oil temperature reaches between 55°C /
131°F and 70°C / 158°F, the oil flow is divided
between oil cooler (-12-) and bypass pipe.
At oil temperatures upwards of 70°C / 158°F, the
entire oil flow flows through the oil cooler (-12-).
The oil separated in the oil fine separator (-7-) is
fed back to the compressor through the oil suction
pipe.
The entire oil circuit is based on differential
pressure in the system. If you account for
differential pressure within the oil circuit of approx.
2 bar / 29 PSI, then the oil is injected in the screw
compressor with approx. 8bar / 116PSI at a vessel
pressure of, for example, 10bar / 145PSI.
Summary of Contents for L160 110A V2
Page 1: ...User manual Screw compressor L160 L290 V2 L160RS L290RS V2 America ZS1149274 03 January 2017...
Page 7: ...Foreword 1 January 2017 America 7 72 1 6 Rating plate Fig 1 1 Rating plate...
Page 69: ...Appendix 9 January 2017 America 69 72...
Page 70: ...9 Appendix 70 72 America January 2017...