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GB
11
GB
Practice staff / technicians
Page
GB
Practice personnel / technicians
Preparations before first use
14. Preparations before first use
Before using the compressor for the first time, it must be ensured
that all the fastenings securing the compressor for transportation
have been removed. Ensure that the compressed air lines are
connected correctly. The compressor must be connected to the
mains supply in the proper manner. Switch on the compressor at
the pressure switch by rotating the switch to position “1”.
Safety valve
The safety valve is set at 10 bar, checked and stamped
before leaving the factory. When the compressor is
operated for the first time, the safety valve must be
checked.
The safety valve may not be used to vent the pressure
tank, as this may impair the function of the safety valve.
Adjusting the pressure switch
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See picture
The pressure switch is factory-set. The power unit switches itself
on when the tank pressure reaches 5 bar and switches itself off
when it reaches 7 bar. If necessary, the working pressure of the
compressor may be altered at the pressure switch.
These tasks may only be carried out by authorised
technicians. During this work the protective cover of the
pressure switch must be removed.
The adjustment can only be carried out while the unit is
live.
If problems develop with the cut-in and cut-out pressure, refer to
the following:
Screws A: Minimum pressure adjustment (cut-in) – both of them
have to be regulated at the same level. Note that to regulate
Max pressure, it is enough to regulate screws A (min. pressure)
because the differential pressure is fixed.
Screw B: Differential min-max pressure adjustment (cut-out) –
actually regulated at 2 bar.
The cut-in pressure is set by even adjustment of the two screws A.
Turn clockwise to increase the switch-on and anticlockwise to
reduce it.
The cut-out pressure is set by means of differential screw B (cut-
in pdifferential=cut-out pressure). Turn clockwise to
increase the differential.