Cleaning The Primary Filter (3997C - 3997Wc); Emergency Stopping; Emptying The Dust Container; Plastic Bag - Nilfisk 3997 Manuel D'instructions

3997 - 3997C - 3997W - 3997WC
Cleaning the primary filter (3997C -
3997WC)
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.
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.
GB
C31
Figure 7
WARNING!

Emptying the dust container

■ 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].
■ 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.
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WARNING!
WARNING!
01/2015