Vacuum Cleaner Operation; Cleaning The Primary Filter (3997 - 3997W) - Nilfisk-Advance 3997 Instruction Manual

Vacuum cleaner operation

Figure 6
Vacuum gauge (2): green zone (3), red zone (1)
Check the flow rate:
■ when the vacuum cleaner is operating, the pointer of
the vacuum gauge must remain in the green zone (3)
to ensure that the speed of the intake air does not drop
below the safety value of 20 m/sec;
■ if the pointer is in the red zone (1) it means that the
speed of the air in the vacuum hose is less than 20 m/s
and that the vacuum cleaner is not operating in safety
conditions. The filters must be cleaned or replaced.
■ during normal operation conditions, close the vacuum
hose, the pointer of the vacuum gauge must switch from
the green zone (3) to the red zone (1).
WARNING!
When the vacuum cleaner is operating, always check
that the vacuum gauge pointer remains in the green
zone (3).
Consult the "Troubleshooting" chapter if faults occur.
01/2015
3997 - 3997C - 3997W - 3997WC

Cleaning the primary filter (3997 - 3997W)

Depending on the vacuumed dust quantity and if the pointer
of the vacuum gauge (Fig. 6) switches from the green zone (3,
Fig. 6) to the red zone (1, Fig. 6) turn the vacuum cleaner off
and shake the main filter.
"3997 - 3997W" models are equipped with a differential
vacuum gauge that stops the vacuum cleaner when the filter
is clogged.
WARNING!
The differential activates when the filter has reached
the maximum allowable clogging: frequently shake the
filter before the activation of the differential to keep it
in good condition.
If the indicator is still in the red area. The suction hose or
one of the accessories may be clogged, and not the filter.
Clean these parts if this is the case.
WARNING!
Stop the vacuum cleaner before shaking the filter.
Do not shake the filter while the vacuum cleaner is on,
as this could damage the filter itself.
Turn off the vacuum cleaner by pressing the red stop button
(PA, fig. 5).
Wait a few seconds to allow the motor to stop, then press the
filter shaker control button (PS1, fig. 5) for 10 ÷ 15 seconds.
Wait before restarting the vacuum cleaner, to allow the dust to
settle. Replace the filter element if the pointer still remains in
the red zone (1, Fig. 6) even after the filter has been shaken
(consult the "Primary filter replacement" paragraph).
9
[ NOTE ]
GB
C31