Reference Description
SV Safety valve
UA Unloader
UV Unloading valve
US Blow-off silencer
Y1 Loading solenoid valve
Ci Intercooler
SV2 Safety valve
DP Oil drain plug
SG Oil level sight-glass
Reference Description
1 Air inlet silencer
2 Left cylinder
(LP)
3 Right cylinder
(HP)
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
LT 2 up to LT 7 with DOL starter
The regulating system includes:
• Check valve (CV)
• Air pressure switch (MDR) with pressure release valve (6) and on/off button (S1).
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.
LT 5 up to LT 20 each with Y/D starter
Instruction book
20 2920 7089 90
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