This electrovalve is a Normally Open (NO) and is wired in pallel to the compressor unit.
When the power supply breaks (end of the charging cycle or mains blackout), this elec-
trovalve remains open so it can relief the pressure from the outlet pipe hose.
GB
Perform the test as follows:
1.Empty the compressor air tank
2.Close the compressor outlet on the tank and check that the drain cap is closed
3.Start the compressor and check the time elapsing between starting and automatic
switching off
4. Check that there are no leaks on connections.
5. check max. pressure
Tank filling times from 0 to p max for the models are reported on pag.53.
Pressure switch adjustment must be carried out by skilled personnel only.
1. adjustment of max. pressure (cut out)
Max pressure can be adjusted through the two screws "A" and "B" or "A".
Rotate the screws "A" and "B" or "A" clockwise in order to increase pressure.
2. adjustment of differential pressure (cut in)(where available).
Differential pressure can be adjusted through the screw "C".
Rotate the screw "C" clockwise to reduce differential pressure.
If the pressure switch does not work (overpressure), the safety valve automatically
opens when the pressure exceeds its rating.
Never set a cut-out pressure level exceeding the pressure value indicated
on the compressor data plate. Refer to pag.53 for the right settings.
19
4.2 CHECK OF FILLING UP TIME
4.3 - ADJUSTMENT OF PRESSURE SWITCH (fig. 4):