Components
No
Designation
No
Designation
No
Designation
1
Suction air filter
11
Final compression pres-
sure sensor (B2)
24
3/2-way solenoid valve
(regulator valve) (Y1)
2
Suction regulator; resid-
ual pressure 1.5 bar /
22 psi
12
Pressure-retention and
non-return valve
Opening pressure
4.5 bar / 65 psi
25
Blow-off valve (Y4)
2.1
Adjusting cylinder
13
Line pressure sensor
(B1)
26
Throttle; orifice diameter
1.2 mm / 0.047 "
2.2
Butterfly valve
14
Aftercooler compressed
air
27
Suction filter monitor (opti-
cal)
2.3
Adjustable throttle
15
Oil cooler
28
Suction filter monitoring
(S7); optional
Switching point 50mbar /
20 in H
2
O
3
Electric motor
16
Oil temperature regu-
lator; opening starts at
55°C / 131 °F
29
Fine separator monitoring
(S6); optional
Switching point 1.2 bar /
17 psi
4
Screw compressor
17
Moisture sensor
30
Oil filter monitoring (S5);
optional
Switching point 2.2 bar /
32 psi
5
Final compression tem-
perature sensor (R2)
18
Oil filter
31
Dirt trap (only xxxW)
6
Pressure vessel
19
Cooling air fan
32
Cooling water solenoid
valve (Y6) (only L xxxW)
7
Fine separator
20
Motor lubrication system
E4/E5
33
Adjustable throttle valve
(only L xxxW)
8
Oil drain
21
Non-return valve
34
Cooling water tempera-
ture monitor (only L xxxW)
9
Safety valve
22
Motor temperature moni-
toring (R1)
35
Oil suction non-return
valve; optional
10
Oil level indicator
23
Pressure reducing valve 36
Frequency converter
L90RS - L132RS ;
optional
Chart 3-2: Components
3.4
Oil circuit
Standard system without speed control
At oil temperatures less than 55°C the oil flows
from the pressure vessel (6) through the cooler by-
pass pipe directly to the oil filters (18) and is then
injected into the screw compressor (4).
If the oil temperature reaches a value between
55°C and 70°C the oil flow is divided between oil-
cooler (15) and bypass pipe.
For oil temperatures greater than 70°C the entire
oil flow flows through the oil cooler (18).