Nilfisk 3707 Manual De Instrucciones página 35

Primary filter cleaning with electric filter shaker
According to the quantity of vacuumed material, if the vacuum
gauge pointer goes from the green zone to the red zone, shake
the primary filter by pressing the electric filter shaker button for
10 ÷ 15 seconds.
CAUTION!
Stop the machine before using the filter shaker.
Do not shake the filter with the machine functioning, as
this could damage the filter.
Wait before restarting the machine, to allow the dust to settle.
Replace the filter element if the vacuum gauge pointer stays
in the red zone even after the filter has been shaken (see
"Primary and absolute filters disassembly and replacement").
[ NOTE ]
If the indicator is still in the red area. The vacuum hose or
one of the accessories may be clogged, and not the filter.
Clean these parts if this is the case.
Primary cartridge filter cleaning with automatic
system
Figure 8
1. Filter cleaning solenoid valve 1
2. Filter cleaning solenoid valve 2
3.
Filter cleaning solenoid valve 3
4. Filter cleaning solenoid valve 4
5. Cartridge container pressure switch
When it is necessary to vacuum very fine dust continuously
without stopping to clean the filters, the Manufacturer provides
the machine of a multi-cartridge filtering system.
The unit is equipped with a fully automatic electropneumatic
device to alternately clean the filtering cartridges, which
guarantees continuous service.
Electric panel, powered with a 24V rating, is complete with
cyclic timer to regulate the following times:
T1 Filter cleaning time
Opening time of the solenoid valve for backwashed air exhaust
into the cartridge.
The shorter the time, the more energetic the cleaning action
will be.
T2 Work hold time
Time between one cartridge cleaning operation and the next.
T3 Time between cleaning cycles
Time between one cleaning cycle and the next.
Check the arrows on the knobs of the timer for the exact
regulation.
Replace the filter element if the vacuum gauge pointer stays
in the red zone even after the filter has been shaken (see
"Primary and absolute filters disassembly and replacement").
[ NOTE ]
If the indicator is still in the red area. The vacuum hose or
one of the accessories may be clogged, and not the filter.
Clean these parts if this is the case.
3707 - 3707/10 - 3907 - 3907/18 - 3907W
Pressure inlet in the tank:
■ Min. 4 bar;
■ Max. 6 bar.
A pressure gauge is installed near the filter.
Install an ON-OFF device (ball valve or similar) in the air supply
line to easily performed the maintenance procedures.
The filter must be powered by a specific branch that can be
disconnected independently.
The installer must properly fix the compressed air hoses and
provide appropriate protection against sudden detachment of
the hoses.
Compressed air must be:
1. Clean - i.e. free from waste that could damage the solenoid
valves.
2. Dehumidified - the filter tank is equipped with a cap for
discharging the condensation. However, the use of a
condensate separator should be considered.
3. Deoiled - oily substances in the air can cause premature
and irreversible clogging. Use filters that keep the air
always clean and deoiled.
Empty the pipes before connecting the compressed air
to the filter.
Container and dust bag cleaning
Emptying the container
Before proceeding with these operations, turn off the
machine and remove the plug from the power socket.
Check the machine filtration class.
Before emptying the container it is advisable to clean the filter
(see "Cleaning the primary filter" paragraph).
■ Release the dust container (2) with the lever (3), then
remove and empty it.
■ Clean the machine as described in the "Maintenance,
cleaning and decontamination" paragraph.
■ Wash the container with clean water if aggressive
substances have been vacuumed.
■ Make sure the gasket is in perfect condition and correctly
positioned.
■ Place the container back in position and secure it again.
After the cleaning session, leave the machine running for at
least 60 seconds before turning it off.
Avoid switching on/off too frequently.
13
CAUTION!
CAUTION!
Figure 1
[ NOTE ]
EN
GB
C65