Safety Devices; Controls, Indicators And Connections; Inspections Prior To Starting; Vacuum Cleaner Operation - Nilfisk VHW320 Manuel D'instructions

VHW320 - VHW321 - VHW420 - VHW421 - VHW440

Safety devices

1.
Vacuuming unit
2. Limiting valve
3. Clapet
Do not tamper any limiting valve setting.

Controls, indicators and connections

1. Dust container release lever
2. Castor lever
3. PullClean filter cleaning system
4.
Vacuum gauge
5. Start/stop switch
6. Electric power cable
7. Handle
8. Shutter valve

Inspections prior to starting

1.
Inlet
Prior to starting, check that:
■ the filters are installed
■ all latches are tightly locked
■ the vacuum hose and tools have been correctly fitted into
the inlet (1)
■ the bag or safety dust container is installed, if applicable.
Do not use the device if the filter is faulty.
Starting/stopping the vacuum cleaner
Lock the caster brakes (1) before starting the vacuum
GB
cleaner.
■ Turn the switch (2) to "I" position to start the vacuum
cleaner.
■ Turn the switch to "0" position to turn the vacuum cleaner
off.
C393
Figure 5
WARNING!
Figure 6
Figure 7
WARNING!
Figure 8
WARNING!

Vacuum cleaner operation

Checking the rotation direction of the vacuum unit
motor
Check the vacuum cleaner operation by putting a hand on the
inlet.
If the vacuum cleaner does not vacuum any air, the motor
rotation direction is wrong; disconnect the machine from the
electrical mains and invert two of the three phase wires inside
the power plug.
Vacuum gauge (2): green zone (3), red zone (1)
Air speed check:
■ 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).
If the vacuum cleaner belongs to the M or H class,
use only hoses with diameters that comply with the
indications in the Technical data table.
This is done in order to prevent the air speed from
dropping below 20 m/sec in the vacuum hose.
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.

Main filter cleaning

Depending on the vacuumed dust quantity and when the
pointer of the vacuum gauge switches from the green zone (3,
Fig. 9) to the red zone (1, Fig. 9), clean the main filters with
the shutter valve (1, Fig. 10) and then activate the PullClean
(2, Fig. 10).
Replace the filter elements if the pointer still remains in the
red zone (1, Fig. 9) even after the cleaning procedure (consult
the "Main filter replacement" paragraph).
10
Figure 9
WARNING!
WARNING!
Figure 9-10
03/2017