20 2920 7090 00
Instruction book
Reference
Description
SV
Safety valve
UA
Unloader
UV
Unloading valve
US
Blow-off silencer
Y1
Loading solenoid valve
Reference
Description
R
Air inlet silencer
2
Left cylinder
3
Right cylinder
4
Cooler
5
Cooling pipe
6
Pressure release valve
7
Electrical cubicle
8
Plunger
9
Spring
10
Pressure regulator
11
Refrigerant dryer
2.4 Regulating system
LF 2 up to LF 10 with DOL starter
The regulating system includes:
Check valve (CV)
Air pressure switch (MDR) with pressure release valve (6) and on/off button (S1).
For 10 to 20 Hp also Sol valve (for quicker discharge of head)
Operation
Air pressure switch (MDR) opens and closes its contacts at pre-set pressures. During loaded operation, the
contacts are closed: the motor is running.
When the pressure in the air receiver reaches the pre-set maximum pressure, the contacts as well as pressure
release valve (6) are opened. The motor stops, the air at the delivery side of the compressor is vented to
atmosphere and check valve (CV) closes to prevent venting of the receiver.
When the pressure in the air receiver decreases to the pre-set minimum pressure, the contacts of the air
pressure switch close and pressure release valve (6) closes. The motor restarts and compressed air is
supplied to the receiver again.
LF 2 up to LF 10 with Y/D starter
The regulating system includes:
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