C31
10
01/2015
3997 - 3997C - 3997W - 3997WC
GB
Cleaning the primary filter (3997C -
3997WC)
Figure 7
When very fine dust is continuously vacuumed without
the vacuum being stopped and the filters cleaned, the
Manufacturer can supply the machine with a filtering system
consisting of four cartridges with capability 3 micron filtration.
The unit is equipped with a fully automatic electropneumatic
device (
1
) to alternately clean the filtering cartridges (
2
), which
guarantees continuous service;
Electric panel (
3
), powered with a 24 V rating, is complete with
cyclic timer to regulate the following times:
■
time between one cleaning cycle and the next, set on 1
minute;
■
time between one cartridge (
2
) cleaning operation and
the next, set from 30 seconds;
■
opening time of the solenoid valve for backwashed air
exhaust into the cartridge, set at 2 tenths of a second.
The shorter the time, the more energetic the cleaning
action will be.
WARNING!
Pay particular attention not to let the supply pressure
to the filter unit exceed 5 bar (a pressure governor “4”
fig. 7 is installed).
An exceeding pressure will dilate the the pores of the
cartridge, resulting in a reduced filtering capacity.
Emergency stopping
Turn the main switch (
Q1
, fig. 5) to “0” position.
Emptying the dust container
WARNING!
■
Before proceeding with these operations, turn off
the vacuum cleaner and remove the plug from the
power socket.
■
Check the class of the vacuum cleaner.
Before emptying the container it is advisable to clean the filter
(see “Cleaning the main filter” paragraph).
■
Normal version not suitable for vacuuming hazardous
dust.
■
Release the dust container (
1
, Fig. 8), then remove and
empty it.
■
Make sure that the seal is in perfect condition and
correctly positioned.
■
Place the container back in position and secure it again.
Plastic bag
A plastic bag (
2
) can be used to collect dust (see Fig. 8).
In this case, the vacuum cleaner must be equipped with
optional accessories [depressor (
3
) and grid (
4
), Fig. 8].
WARNING!
■
These operations can only be carried out by
trained and qualified personnel who must wear
adequate clothing, in compliance with the laws in
force.
■
Take care not to raise dust when this operation is
carried out. Wear a P3 protective mask.
■
In case of dangerous and/or toxic dust, use
different kinds of safety bags.
■
The bag must only be disposed of by qualified
personnel and in compliance with the laws in
force.
Summary of Contents for 3997
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