CompAir L18FS User Manual

4. Design and functioning
24
Stopping the system
• Solenoid valve (-23-(Y1)) is deenergised when the
STOP button on the operating panel of the
compressor control DELCOS XL is pressed.
• The upper control space of the adjusting cylinder
(2.1) is ventilated by the solenoid valve (-23-(Y1)),
the pressure spring in the adjusting cylinder causes
the choke valve (-2.2-) in the intake regulator to
close.
• After 30 seconds, the drive motor (- 3 -) and the
cooling air ventilator motor (- 18 -) are shut down.
The cooling water solenoid valve -28- deenergises
and closes (Lxx W only).
Automatic operation (open-close operation)
• When the pressure reaches the upper switching
point set on the network pressure sensor (-13-(B1)),
solenoid valve (- 23 - (Y1)) is deenergised.
• The upper control space of the adjusting cylinder
(2.1) is ventilated by the solenoid valve (-23-(Y1)),
the pressure spring in the adjusting cylinder causes
the choke valve (-2.2-) in the intake regulator to
close.
• The oil separator tank is relieved to no-load
pressure (residual pressure) via the blow-off valve
(- 24 -).
• The screw compressor is now running in the offload
mode.
• The cooling air ventilator (- 18 -) is switched on or
off in dependence upon the final compression
temperature (only Lxx A - air-cooled units).
• The cooling water solenoid valve (-33-(Y6)) is
opened and closed depending on the compression
end temperature (only Lxx W – water-cooled units).
• When the pressure at the network pressure sensor
(- 13 - (B1)) does not fall to the set lower switching
point within the set motor run-on time (e.g. 120
seconds), the drive motor (- 3 -) and the cooling air
ventilator motor (- 18 -) are shut down and the
system is depressurised to atmospheric pressure.
The cooling water solenoid valve -28- deenergises
and closes (Lxx W only).
• The system is now in the “stand-by” mode and can
restart at any time when the network pressure falls
to the lower switching point (see section “Starting of
the system”).
• When the pressure falls to the preset lower
switching point before the set motor run-on time has
elapsed, solenoid valve (- 23 - (Y1)) is energised
again.
• The unit now changes over to on-load operation.

CompAir L18FS Specifications

General

Brand	CompAir
Model	L18FS
Category	Air Compressor
Language	English