Atlas Copco LE 3 User Manual

20 2920 7089 80
Instruction book
Reference
Description
RV Pilot valve
SV Safety valve
UA Unloader
UV Unloading valve
US Blow-off silencer
Y1 Loading solenoid valve
DP Oil drain plug
SG Oil level sight-glass
Reference
Description
1 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
LE 2 up to LE 20 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.
LE 5 up to LE 20 each with Y/D starter
The regulating system includes:

Atlas Copco LE 3 Specifications

General

Brand	Atlas Copco
Model	LE 3
Category	Air Compressor
Language	English