VHW420 - Industrial vacuum cleaner NILFISK - Free user manual and instructions
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| Product type | Industrial vacuum cleaner |
| Brand | Nilfisk |
| Model | VHW420 |
| Dimensions (L x D x H) | 1400 x 1000 x 550 mm |
| Weight | 110 kg |
| Power supply | 400 V ~ 50 Hz |
| Power | 2.2 kW |
| Max suction | 190 mbar |
| Max air flow (without hose) | 300 m³/h |
| Max air flow (hose 3 m, Ø 40 mm) | 235 m³/h |
| Sound pressure level | 65 dB(A) |
| Tank capacity | 46 L |
| Filtration class | L, M, H, ACD, ATEX (depending on version) |
| Absolute filter efficiency | 99.995% (H14 per EN 1822) |
| Protection rating | IP55 |
| Suction port diameter | 70 mm |
| Main functions | Suction of dry and liquid dust (with option), filter cleaning systems (PullClean, manual, automatic, InfiniClean depending on version) |
| Safety | Emergency stop, residual current circuit breaker 30 mA, grounding, protection against hazardous dust |
| Maintenance and cleaning | Cleaning and replacement of primary and absolute filters, tank emptying, dust bag replacement (paper, plastic, Safe Bag) |
| Spare parts and repairability | Filter kits, gaskets, bags, recommended original Nilfisk parts; maintenance by qualified personnel |
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USER MANUAL VHW420 NILFISK
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Line drawing of a cylindrical industrial machine with wheels and control panel (no text or symbols)Translation of the original instructions
Table of contents
Instructions for use....2
Operator's safety 2
General information for using the machine 2
Proper uses 2
Improper Use....2
Testing and guarantee.... 3
How to request assistance .... 3
Exclusion of liability 3
Versions and variations 3
General recommendations....4
Residual Risks....4
EC Declaration of conformity....4
Description of the machine ....5
Machine Parts and Labels....5
Optional kits....5
Accessories 5
Packing and unpacking 5
Unpacking, moving, use and storage 6
Setting to work - connection to the power supply 6
Extensions....7
Dry applications....7
Technical data 8
ATEX Variant Technical Data....9
Dimensions....10
Controls and indicators.... 10
Inspections prior to starting 10
Starting and stopping 10
Emergency stopping.... 10
Operation....11
Maintenance, cleaning and decontamination....11
Filter cleaning 12
Container and dust bag cleaning.... 13
Dust bag replacement 14
Primary and absolute filter replacement.... 14
Installation, cleaning and replacement of the separator (optional).... 16
Tightness inspection.... 16
Disposal....17
Wiring diagrams 18
Recommended spare parts ....18
Troubleshooting 18
Instructions for use
Read the operating instructions and comply with the important safety recommendations identified by the word CAUTION!
Operator's safety
CAUTION!
Before starting the machine, it is absolutely essential to read these operating instructions and to keep them handy for consultation.
The machine can only be used by people who are familiar with the way it works and who have been explicitly authorised and trained for the purpose.
Before using the machine, the operators must be informed, instructed and trained on how to work it and for which substances its usage is permitted including the safe method for removing and disposing of the vacuumed material.
CAUTION!
The use of the machine by people (including children) with limited physical and mental capacities or lacking in experience and knowledge is strictly forbidden, unless they are supervised by a person who is experienced in the use and safe handling of the machine.
Children must be supervised to make sure they will not play with the machine.
CAUTION!
Before using the machine, always check that any hazardous condition has been eliminated and inform the people in charge about any operational fault.
Check that all guards and protections are correctly mounted and that all safety devices are installed and efficient.
Repairs must only be carried out when the machine is at a standstill and disconnected from the electricity and air supply mains. Never ever carry out repairs without having first received the necessary authorization.
CAUTION!
Any changes made by the user without the Manufacturer's explicit authorization shall invalidate the warranty and hold the Manufacturer harmless from any and all liabilities for damages caused by faulty products.
General information for using the machine
Use the machine in accordance with the laws in force in the country where it is used.
Besides the operating instructions and the laws in force in the country where the device is used, the technical regulations for ensuring safe and correct operation must also be observed (Legislation concerning environmental and labour safety, i.e. European Union Directive 89/391/EC and successive Directives).
Do not perform any operation that could jeopardize the safety of people, property and the environment.
Comply with the safety indications and prescriptions in this instruction manual.
Proper uses
This machine is suitable for commercial use, in hotels, schools, hospitals, factories, shops, offices and apartment hotels for example, for hire and in any case for purposes other than normal domestic use.
This machine is suitable for cleaning and vacuuming solid materials in indoor and outdoor environments.
The machine has been designed to be used by one operator at a time.
This machine consists of a vacuum unit, with an upstream filter unit and a container for collecting the vacuumed material.
Improper Use
CAUTION!
The following use of the device is strictly forbidden:
■ Outdoors in case of atmospheric precipitation.
■ When not placed on horizontal level ground.
■ When the filter unit is not installed.
■ When the vacuum inlet and/or hose are turned to face parts of the human body.
■ Use without the cover on the vacuum unit.
■ When the dust container is not installed.
■ Use without the guards, protective covers and safety systems installed by the manufacturer.
■ When the cooling vents are partially or totally clogged.
■ When the machine is covered with plastic or fabric sheets.
■ Use with the air outlet partially or totally closed.
■ When used in narrow areas where there is no fresh air.
CAUTION!
The following use of the device is strictly forbidden:
■ When the cable or plug is damaged. If appliance is not working as it should, has been dropped, damaged, left outdoors or dropped into water, return it to an authorized service center.
■ Vacuuming liquids with machine not equipped with specific original stopping systems.
■ Do not pull or carry by the cord, use the power cord as a handle, do not close a door on cord, or pull cord around sharp edges or corners. Do not run the appliance over the cord. Keep cord away from heated surfaces.
■ Vacuuming the following materials:
- Burning materials (embers, hot ashes, lit cigarettes, etc.).
- Naked flames.
- Combustible gas.
- Flammable liquids, aggressive fuels (gasoline, solvents, acids, alkaline solutions, etc.).
- Explosive dust/substances and/or ones liable to ignite in a spontaneous way (such as magnesium or aluminium dusts, etc.).
Note: Fraudulent use is not admitted.
Testing and guarantee
■ Testing
Each machine is subjected to a final test involving its operation and performances. This guarantees maximum efficiency during the work the machine must carry out.
■ Warranty
The guarantee clauses are specified in the sales contract.
How to request assistance
In the event of faults or malfunctions requiring the intervention of specialized technicians, contact the Manufacturer or your nearest After-Sales Service Centre.
Exclusion of liability
The machine was delivered to the user according to the conditions valid at the time of purchase.
For no reason what so ever shall the user be authorized to tamper with the machine.
Contact your nearest After-Sales Service Centre in the event of faults.
All attempts by the user or by unauthorized personnel to demount, modify or, more generally, tamper with any part of the machine shall void the guarantee and relieve the manufacturer of all responsibility for damage to either persons or property caused by such action.
The manufacturer shall also be relieved of liability in the following cases:
■ Wrong installation.
■ Improper use of the machine by inadequately trained personnel.
■ Utilization contrary to the provisions in force in the country of use.
■ Incorrect or insufficient maintenance.
■ Use of non-genuine spares or use of spares that are not specifically made for the model in question.
■ Total or partial failure to comply with the instructions.
■ Failure to forward the warranty certificate.
■ Exceptional environmental events
Versions and variations
Versions for dust harmful for the health
Vacuum cleaners for dust harmful to health are classified according to different dust classification, in compliance with standard EN 60335-2-69 – Annexe AA:
■ L (low risk) suitable for separating dust with an exposure limit value of over 1 mg/m ^3 , depending on the volume occupied; retains at least 99% of vacuumed particles;
■ M (medium risk) suitable for separating dust with an exposure limit value not lower than 0.1 mg/m ^3 ; retains at least 99.9% of vacuumed particles;
■ H (high risk) for separating all dust with an exposure limit value lower than 0.1 mg/m ^3 , depending on the volume occupied, including carcinogenic and pathogenic dusts, such as asbestos; retains at least 99.995% of the vacuumed particles.
[ NOTE ]
■ In the case of dust harmful to health, contact the local health and safety authorities, and observe national regulations in force both during use and disposal.
■ Radioactive substances are not included in the definition of the type of dust harmful to health described above.
[ NOTE ]
Machines designed for picking up sawdust and quartz-containing mineral dust shall be at least M-class.
Versions for combustible powders (ACD)
This machine is suitable to vacuum combustible dust, with the exception of magnesium dust, in areas not classified as ATE (normal locations) and certified in accordance with EN 60335-2-69 - Annex AA.
[ NOTE ]
Refer to the manufacturer's sales network for these versions.
For ACD devices, see the instructions for "ACD" use.
ATEX variants
[ NOTE ]
Refer to the manufacturer's sales network for these versions.
For ATEX devices see the instructions for "ATEX" use.
The manufacturer produces machines suitable to be used in potentially explosive atmospheres. These variants are manufactured according to directives and standards in force. The relevant additional instructions are supplied together with the machine.
HEPA variants
This machine can be equipped with an upstream filter (HEPA). The procedures for servicing and emptying the machine including removing the dust container, must only be performed by authorized personnel wearing protective clothing. Do not use without the complete filter system in place.
General recommendations
CAUTION!
If an emergency situation occurs:
■ for example, accident - fault - filter breakage - fire - etc.
Disconnect the machine from the power supply and ask for assistance from qualified personnel.
In case the user comes into contact with the vacuumed product, check the cautions shown on the safety technical sheet of the product, which must be made available from the employer.
[ NOTE ]
Check the place of work and substances tolerated for the machine suitable for liquids.
![NILFISK VHW420 - [ NOTE ] - 1](/content/2026/04/639974/images/a4df66409be21c2024f678cfcda1f19fe304dc5cbc2e468397d9184690472c68.jpg)
CAUTION!
The machines must not be used or stored outdoors, or in damp places.
Only versions with the level sensor can be used for liquids, if not, they can only be used to vacuum dry materials.
CAUTION!
Version for liquids.
If foam or liquid leaks out of the machine, turn it off immediately and contact qualified personnel for assistance.
[ NOTE ]
These devices must not be used in corrosive environment.
Residual Risks
After carefully considering the risks that are present in all machine operating phases, necessary measures were adopted in order to eliminate the risks for the operators, as far as possible, and/or limit or reduce the risks deriving from hazards that cannot be completely eliminated at the source.
During operations and/or maintenance, operators are
exposed to certain residual risks which, due to the nature of the operations themselves, cannot be completely eliminated. Therefore the installer is responsible for providing additional information and/or hazard signals based on the location of machine installation and the material that is handled.
Risks due to electrical hazards during maintenance
DANGER
Risk of electrocution if accessing the electrical equipment during maintenance without having deactivated the electrical power supply.
FORBIDDEN
It is forbidden to work on the electric equipment before disconnecting the machine or its parts from the electrical line.
MANDATORY
Have the electrical maintenance operations performed by qualified personnel. Perform the checks on the electric equipment as specified in the manual.
Risks to the presence of residual high temperature after stopping the vacuum unit.
During maintenance and cleaning operations, the operator may come into contact while the machine is stopped, with parts of the vacuum unit with surfaces at high temperatures. Specific warning signs placed in strategic points indicate the hazard due to the presence of hot surfaces and the obligation for the user to wear personal protective equipment, in particular protective gloves.
The potentially hot parts (high temperatures) are identified as follows:
IT IS MANDATORY TO WEAR GLOVES
EC Declaration of conformity
Every machine comes with a EC Declaration of conformity. See fac-simile in fig. 23.
[ NOTE ]
The Declaration of conformity is an important document and should be kept in a safe place to be presented to the Authorities on request.
Description of the machine
Machine Parts and Labels
Figure 1
- Identification plate:
Model code, serial number, EC marking, year of manufacture, weight (kg) - Warning label for Class L - M - H - ACD vacuum cleaners.
- Vacuum inlet
- Dust container
- Dust container release lever
- Castor brake lever
- Handle
- Closing lever
- PullClean filter cleaning system
- Plug for connecting the vacuum cleaner to an electrical socket.
- Panel power plate
Indicates that the panel is powered by the voltage indicated on the data plate
The access to the panel is allowed to specialized personnel only who, before touching the electrical equipment, must disconnect the machine from its power source by turning the main switch to 0 - (off) and by removing the plug from the electrical socket.
This machine creates a strong air flow which is drawn in through the vacuum inlet and blows out through the outlet.
Before turning on the machine, fit the vacuum hose into the inlet and then fit the required tool on to the end part (refer to the manufacturer's accessory catalogue or Service Centre).
The diameters of the authorized hoses are indicated in the Technical data table.
The machine is equipped with a primary filter which enables it to be used for the majority of applications.
In addition to the primary filter that retains the most common dust, a secondary filter (absolute filter) can be installed.
This machine is equipped with an internal baffle plate which subjects the vacuumed substances to a circular centrifugal movement that makes them drop into the container.
Figure 2
Vacuum cleaners for dust harmful to health and/or combustible dust are classified according to different dust classification, in compliance with standard EN 60335-2-69 – Annex AA:
-
Class L label
-
Class M label
-
Class H label
-
ACD label
The class H label reads the following.
CAUTION!
This vacuum cleaner contains dust hazardous for the health.
Only authorised personnel wearing suitable personal protective equipment should empty
and service the machine, including removing the means used to vacuum the dust. Do not use without the complete filter system in place.
Appliances intended for use in atmospheres classified as explosive are constructed in accordance with 2014/34/EU Directive (ATEX):
- ATEX label
Optional kits
Various optional kits are available for converting the machine.
On request, the machine can be supplied with optional kits already installed. However, they can also be installed at a later date.
Please contact the sales network for further details.
Instructions describing how to fit the optional kits and the relative operation and maintenance manuals are supplied together with the optional kits.
CAUTION!
Use only supplied and authorised genuine spare parts.
Accessories
Various accessories are available; refer to the manufacturer's accessory catalogue.
CAUTION!
Use only genuine accessories supplied and authorised by the manufacturer.
Packing and unpacking
All the dispatched equipment has been thoroughly checked before being delivered to the haulage contractor.
On arrival, check the machine to see that it has not been damaged during transport. In case of damage, immediately lodge a complaint with the haulage contractor.
Dispose of the packing materials in compliance with the laws in force.
Figure 3
| Model A (mm) | B (mm) | C (mm) | kg (*) | ||
| VHW32x 500 | 900 | 1350 | 95 | ||
| VHW32x IC - C | 500 | 900 | 1650 | 110 | |
| VHW4xx 600 | 1050 | 1650 | 140 | ||
| VHW4xx IC - C | 600 | 1050 | 1950 | 160 |
(*) Weight with packing
Unpacking, moving, use and storage
To unpack the vacuum unit, remove the retainers with a hammer and a screwdriver.
Also remove the fastening devices placed by the manufacturer when packing, by using suitable tools.
Release the wheel brakes and remove the machine from the supporting platform, by using a ramp that can provide adequate capacity, and by driving the vacuum cleaner by the handle.
Operate on flat, horizontal surfaces.
The load-bearing capacity of the surface the machine is placed on must be suitable for bearing its weight.
If the device is to work in a fixed position, allow wide space around the device in order to ensure freedom of the movement and allow the maintenance staff to operate with ease.
CAUTION!
The manufacturer shall not be liable for any damages caused to the machine during lifting, when the lifting equipment supplied by the manufacturer is not used.
CAUTION!
When several supporting platforms are provided, the supporting platform to which the machine is anchored must be handled with a forklift truck that can provide adequate capacity. Then unpack the machine by laying it down on a flat and horizontal surface that can provide adequate capacity for the vacuum cleaner weight.
Setting to work - connection to the power supply
CAUTION!
■ Make sure there is no evident sign of damage to the machine before starting work.
■ Before plugging the machine into the electrical mains, make sure the voltage rating indicated on the data plate corresponds to that of the electrical mains.
■ Connect the plug into a socket with a correctly installed ground contact/connection. Make sure that the machine is turned off.
■ The plugs and connectors of the connection cables must be protected against splashes of water.
■ Check that for proper connection to the electrical mains.
■ Use the machine only when the cables that connect to the electricity mains are in perfect condition (damaged cables could lead to electric shocks!).
■ Regularly check there are no signs of damage, excessive wear, cracks or ageing on the electric cable.
CAUTION!
■ When the device is operating avoid stepping on, crushing, pulling or damaging the cable that connects to the electrical mains.
■ When the device is operating avoid disconnecting the cable from the mains only by pulling the plug (do not pull on the cable itself).
■ Only replace the electric power cable with one of the same type as the original: H07 RN-F, The same rule applies if an extension is used.
The cable must be replaced by the manufacturer's Service Centre staff or by equivalent qualified personnel.
The system safety officers must:
■ Prevent any improper use or manoeuvre.
■ Make sure that the safety devices are not removed or tampered with.
- Check that all maintenance operations are regularly performed;
■ Make sure that no machine part (couplings, holes, etc.) is modified to attach additional devices;
■ Make sure that only original Nilfisk spare parts are used.
NOTE
The user shall be responsible for ensuring that installation complies with the all relevant local provisions. The equipment must be installed by qualified technicians who have read and understood the instructions herein.
Extensions
If an extension cable is used, make sure it is suitable for the power input and protection degree of the machine.
| Max power (kW) 3 5 1 | 5 22 | |||
| Minimum section (mm2) 2.5 4 10 16 | ||||
| Maximum length (m) 20 | ||||
| Cable H07 RN - F | ||||
ATEX variant: extensions, plugged-in electrical devices and adapters cannot be used when vacuuming flammable dust.
Sockets, plugs, cable clamps, connectors and installation of the extension cable must maintain the IP protection degree of the machine, as indicated on the data plate.
The machine power socket must be protected by a differential circuit-breaker with surge current limitation, that shuts off the power supply when the current discharged to the ground exceeds 30 mA for 30 msec. or an equivalent protection circuit.
Never spray water on the machine: this could be dangerous for people and could short circuit the power supply.
Dry applications
[ NOTE ]
The supplied filters and the bag (if applicable) must be installed correctly.
![NILFISK VHW420 - [ NOTE ] - 1](/content/2026/04/639974/images/acf43f8ebc61cc851dac0cbdc07c237cae5f9fb7d13f9c3080ae4002e198631b.jpg)
Comply with the safety regulations governing the vacuumed materials.
Technical data
| Parameter | Units of measurement | VHW32x VHW42x VHW44x | ||
| Voltage @50Hz V 400 400 400 | ||||
| Power rating kW 1.5 2.2 4.0 | ||||
| Max vacuum mBar 185 190 260 | ||||
| Maximum air flow rate without hose and reductions | m3/h 190 | 300 420 | ||
| Maximum air flow rate (3 m ∅ 40 mm hose) m | 3/h 160 | 235 280 | ||
| Sound pressure level (Lpf) (EN60335-2-69) (*) | dB(A) 60 | 65 67 | ||
| Vibration, ah (**) m/s | 2 | ≤2.5 | ||
| Protection | IP | 55 | ||
| Insulation | Class | I | ||
| Container capacity | L | 25 | 46 | |
| Vacuum inlet (diameter) | mm 50 | 70 | ||
| Allowed hoses (L) | mm 50 | 70 | ||
| Allowed hoses (M-H) | mm 40 | 50 | ||
| Primary filter surface | m2 | 1.0 | 2.0 | |
| Primary filter surface ST version | m2 | 0.8 | 1.95 | |
| Primary filter surface IC - C version | m2 | 1.5 | 2.5 - 5.25 | |
| Upstream H absolute filter surface | m2 | 1.1 | 2.1 | |
| Blower absolute filter surface area | m2 | 1.1 | 2.1 | |
| Absolute filter efficiency according to MPPS method (EN 1822) | % | 99.995 (H14) | ||
(*) Measurement uncertainty KpA < 1.5 dB(A). Noise emission values obtained according to EN-60335-2-69
(**) Total value of vibration output to the operator arm and hand
ATEX Variant Technical Data
| Parameter | Units of measurement | VHW32x VHW42x VHW44x | |||||||
| Z22 Z2 | Z21 Z2 | Z2 Z2 | Z2 Z2 | Z2 Z2 | |||||
| Voltage @50Hz V | 400 400 400 | ||||||||
| Power rating kW 1.6 2.2 2.2 4.0 | 4.0 | ||||||||
| Max vacuum | mBar | 170 | 260 | 190 | 170 | 260 | 260 | ||
| Maximum air flow rate without hose and reductions | m^3/h | 190 300 420 | |||||||
| Maximum air flow rate (3 m ∅ 50 mm hose) | m^3/h | 160 235 280 | |||||||
| Sound pressure level (Lpf) (EN60335-2-69) (*) | dB(A) | 62 | 65 | 67 | |||||
| Vibration, ah (**) | m/s^2 | ≤2.5 | |||||||
| Protection | IP | 55 - 65 | 65 | 55 - 65 | 65 | 55 - 65 | |||
| Insulation | Class | I | |||||||
| Container capacity | L | 25 | 46 | ||||||
| Vacuum inlet (diameter) | mm | 50 | 70 | ||||||
| Allowed hoses (L) | mm | 50 | 70 | ||||||
| Allowed hoses (M-H) | mm | 40 | 50 | ||||||
| Primary filter surface | m^2 | 1.0 | 2.0 | ||||||
| Primary filter surface ST version | m^2 | 0.8 | 1.95 | ||||||
| Primary filter surface IC - C version | m^2 | 1.5 | 2.5 - 5.25 | ||||||
| Upstream H absolute filter surface | m^2 | 1.1 | 2.1 | ||||||
| Blower absolute filter surface area | m^2 | 1.1 | 2.1 | ||||||
| Absolute filter efficiency according to MPPS method (EN 1822) | % | 99.995 (H14) | |||||||
(*) Measurement uncertainty KpA < 1.5 dB(A). Noise emission values obtained according to EN-60335-2-69
(**) Total value of vibration output to the operator arm and hand
Dimensions
Figure 4
| Model | VHW32x | VHW32x IC - C | VHW4xx | VHW4xx IC - C |
| A (mm) | 1400 | 1200 | 1400 | 1750 |
| B (mm) | 800 | 800 | 1000 | 1000 |
| C (mm) | 450 | 450 | 550 | 550 |
| Weight (kg) | 85 | 85 | 110 | 140 |
[ NOTE ]
■ Storage conditions:
Temperature: -10^ ÷ +40^
Humidity: ≤ 85%
■ Operating conditions:
Maximum altitude: 800 m
(Up to 2,000 m with reduced performances)
Temperature: -10^ ÷ +40^
Humidity: ≤ 85%
Controls and indicators
Figure 5
- Vacuum unit start/stop switch Use the button to start/stop the first motor. If the indicator is lit, the main motor is ON.
- Vacuum gauge
- PullClean filter cleaning system
Inspections prior to starting
Figure 6
Before starting, check that:
■ The filters are installed.
■ The closing band is properly tightened.
■ The vacuum hose and tools have been correctly fitted into the vacuum inlet (1).
■ In case of liquid application, the liquid mechanical stop is properly installed inside the liquid container:
■ The bag or safety container is installed, if applicable.
CAUTION!
Do not use the device if the filters are faulty.
Starting and stopping
Figure 5
CAUTION!
Before starting the machine, lock the castor brakes
■ Turn the switch (1) to "I" position to start.
■ Turn the switch (1) to "0" position to turn the vacuum cleaner off.
[ NOTE ]
Check the machine operation. If the machine does not vacuum any air, the rotation direction is not correct; remove the plug from the socket and turn the selector inside the plug to perform the correct phase connection.
Machines equipped with an electrical system preset for start from vacuum inlets
■ Turn the main switch to "I" to electrically power the machine.
■ Press the start button to start the machine.
If the machine is equipped with vacuum inlet sensor, vacuuming will start automatically, after performing the above procedure, when the first inlet will be opened by the operator.
The machine will stop two minutes after the last inlet is closed by the operator. To immediately stop the machine press the stop button (6).
CAUTION!
Too frequent starts of the machine can damage the motor; it is advisable not to modify the tripping time of the sensor located on the vacuum inlets.
Emergency stopping
Turn the switch to "0" to turn off the machine.
Operation
Figure 7
Vacuum gauge (2): green zone (3), red zone (1)
When using the machine, check the flow control:
■ when the machine 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 machine is not operating in optimal conditions. Shake or replace the filter.
■ 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).
CAUTION!
The air speed in the vacuum hose must not be less than 20 m/s.
Condition indicated by the vacuum gauge pointer in the green zone (3).
CAUTION!
All machines can be used only with hoses whose diameters comply with the specifications in the "Technical Data" table.
CAUTION!
Consult the "Troubleshooting" chapter if faults occur.
At the end of a cleaning session
■ Turn off the machine and remove the plug from the socket.
■ Wind up the connection cable.
■ Empty the container and clean the machine as described in the "Maintenance, cleaning and decontamination" paragraph.
■ Wash the container with clean water if aggressive substances have been vacuumed.
■ Store the machine in a dry place, out of reach of unauthorised people.
■ Lock the castor brakes.
■ During transport and when not using the machine, close the vacuum inlet with the relevant plug (if equipped).
Maintenance, cleaning and decontamination
CAUTION!
Disconnect the machine from its power source before cleaning, servicing, replacing parts or converting it to obtain another version/variant.
- Carry out only the maintenance operations described in this manual.
■ Use only original spare parts.
■ Do not modify the machine in any way.
Failure to comply with these instructions could jeopardize your safety. Moreover, such action would immediately void the EC declaration of conformity/ incorporation issued with the machine.
CAUTION!
For maintenance procedures not described in this manual, please contact the manufacturer's technical support or sales network.
CAUTION!
To guarantee the safety level of the machine, only original spare parts supplied by the manufacturer should be used.
CAUTION!
The precautions described below must be taken during all maintenance operations, including cleaning and replacing the primary and absolute filters.
CAUTION!
This Class H machine can collect dust hazardous for the health. The procedures for servicing and emptying the machine including removing the dust bag, must only be performed by specialised personnel wearing protective clothing. Do not use without the complete filter system in place.
CAUTION!
In particular, on Class H machines, the filtering efficiency of the machine must be checked at least once a year, or more often if required by national legislation. The test method for checking the filtering efficiency of the machine is indicated in standard EN 60335-2-69, par. 22.AA.201.2. If the test isn't passed, it must be repeated after the class H filter has been changed.
■ To allow the user to carry out the maintenance operations, the machine must be disassembled, cleaned and overhauled as far as is reasonably possible, without causing hazards for the maintenance staff or other people. The suitable precautions include decontamination before disassembling the machine, adequate filtered ventilation of the exhaust air from the room in which it is disassembled, cleaning of the maintenance area, and suitable personal protection.
■ The external parts of the machine must be decontaminated by cleaning and vacuuming methods, dedusted or treated with sealant before being taken out of a hazardous zone.
■ All parts of the machine must be considered as contaminated when they are removed from the hazardous zone and appropriate actions must be taken to prevent dust from dispersing.
■ When maintenance or repair procedure are carried out, all the contaminated elements that cannot be properly cleaned, must be eliminated. These elements must be disposed of in sealed bags in accordance with applicable regulations and local laws on the disposal of such material. This procedure must also be followed for filter disposal (primary and absolute filters).
■ Compartments that are not dust-tight must be opened with suitable tools (screwdrivers, wrenches, etc.) and thoroughly cleaned.
■ A check must be carried out by the manufacturer or the personnel of the same at least once a year. For example: Check the air filters to find out whether the air-tightness of the machine has been impaired in any way and make sure that the electric control panel operates correctly.
Filter cleaning
Primary filter cleaning with PullClean system
Figure 5
According to the quantity of vacuumed material, if the vacuum gauge pointer (2, Fig. 7) goes from the green zone (3, Fig. 7) to the red zone (1, Fig. 7), clean the primary filter by closing the inlet and by opening the PullClean system flap, repeat the procedure 3 or 4 times, for 1 or 2 seconds each time.
CAUTION!
Perform this procedure with the machine running.
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.
Star filter cleaning with manual system
According to the quantity of vacuumed material, if the vacuum gauge pointer (2, Fig. 7) goes from the green zone (3, Fig. 7) to the red zone (1, Fig. 7), shake the primary filter by turning the lever clockwise/counter-clockwise for at least 5 complete cycles.
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 indicator is red, 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
- Filter cleaning solenoid valve 1
- Filter cleaning solenoid valve 2
- Filter cleaning solenoid valve 3
- Filter cleaning solenoid valve 4
- 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.
Primary cartridge filter cleaning with InfiniClean system
The filtering cartridges serve the purpose of filtering the intake air. The vacuum cleaner is equipped with solenoid valves that, by deflecting the air coming out of the blower, allow for cyclic cleaning of the filtering cartridges. The fully automatic system grants work continuity and is driven by a cyclic timer that allows to adjust the intervals T0, T1, T2 which define the cleaning cycle.
CAUTION!
The factory setting of the cycle intervals is the one that allows for a better cleaning in the majority of applications, for this reason the factory setting should not be modified. If necessary, for heavy applications (for example, to collect heavy quantities of very thin dust - more than 3 kg per minutes), it is possible to modify the intervals by following the instructions in the Service Manual, available at the Manufacturer's Service Centre.
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.
Container and dust bag cleaning
Emptying the container
CAUTION!
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).
Figure 1
■ Release the dust container (4) with the lever (5), 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.
[ NOTE ]
After the cleaning session, leave the machine running for at least 60 seconds before turning it off. Avoid switching on/off too frequently.
Dust Bag
Figure 9
The machine can be equipped with dust collection bag. In this case, the machine must be equipped with optional accessories (depressor and grid). If the bag is not installed or is installed improperly, it could create health risks for people exposed.
Paper Bag and Safe Bag for dust collection
Figure 10
The machine can be equipped with dust collection bag. In this case, the machine must be equipped with a specific container and a cap on the side. If the bag is not properly installed, it could create health risks for people exposed.
[ NOTE ]
The safe bag system is suitable to collect toxic dust to ensure that the user does not come into contact with the product.
Dust bag replacement
CAUTION!
■ Before proceeding with these operations, turn off the machine and remove the plug from the power socket.
■ These operations can only be carried out by trained and qualified personnel who must wear adequate clothing, in compliance with the laws in force.
In case of hazardous and/or harmful dust, use only the bags recommended by the manufacturer (see "Recommended spare parts").
■ The bag must only be disposed of by qualified personnel and in compliance with the laws in force.
■ Use only original Nilfisk bags.
■ Only use bags suitable for the machine class you are using.
CAUTION!
Take care not to raise dust during this operation. Wear a P3 mask and other protective clothing plus protective gloves (PPE) suited to the hazardous nature of the dust collected, refer to the laws in force.
How to replace the Dust Bag
Figure 9
■ Close the inlet by using the relevant cap (if equipped).
■ Release the dust container.
■ Remove the dust bag and close it with a clamp, if necessary.
■ Place a new bag, taking care to wrap it around the outer wall of the dust container.
■ Set the dust container into the machine again.
How to replace the Paper Bag
Figure 10
■ Close the inlet by using the relevant cap (if equipped).
■ Release the dust container.
■ Remove the bag and close it with the relevant cap (1) as shown in the figure.
■ Insert a new bag, making sure the bag inlet is sealed.
■ Set the dust container into the machine again.
How to replace the Safe Bag
Figure 10
■ Remove and put the vacuum hose in a safe and dust-free place.
■ Close the inlet by using the relevant cap (if equipped).
■ Release the dust container.
■ Close the Safe Bag by pulling the "guillotine" seal (2).
■ Close the plastic bag hermetically using the relevant band (3).
■ Use the sticky tape (4) to close the bottom of the plastic bag.
■ Remove the relevant connection (5) of the bag from the vacuum inlet.
■ Insert a new safe bag, making sure the vacuum inlet is well connected to the bag attachment, to grant the sealing.
■ Wrap the plastic bag around the dust container external wall.
■ Place the dust container in the vacuum cleaner.
Primary and absolute filter replacement
CAUTION!
When the machine is used to vacuum hazardous substances, the filters become contaminated, therefore:
■ Work with care and avoid spilling the vacuumed dust and/or material;
■ place the disassembled and/or replaced filter in a sealed plastic bag;
■ close the bag hermetically;
■ dispose of the filter in accordance with the laws in force.
CAUTION!
Filter replacement is a serious matter. The filter must be replaced with one of identical characteristics, filtering surface and category.
Otherwise the machine will not operate correctly. Before proceeding with these operations, turn off the machine and remove the plug from the power socket.
CAUTION!
Before performing these operations, clean the filter as described in the "Maintenance, cleaning and decontamination" paragraph.
CAUTION!
Take care not to raise dust during this operation. Wear a P3 mask and other protective clothing plus protective gloves (PPE) suited to the hazardous nature of the dust collected, refer to the laws in force.
CAUTION!
Reassemble with care to avoid trapping your hands between the vacuum unit and the container. Use gloves that provide protection against mechanical risks (EN 388) with a level of protection CAT. II.
CAUTION!
Do not use the Class H filter again after having removed it from the machine.
Primary filter replacement, for machines equipped with star filter with manual cleaning system
Figure 11
■ Remove the vacuum hose (1).
■ Use the lever (2) to remove the cover (3) together with the primary filter.
■ Remove the old filter from the cage.
■ Dispose of the old filter according to the laws in force.
■ Fit the new filter and secure it in the cage.
■ Install the cover and the primary filter in the reverse order of removal.
Primary cartridge filter replacement, for machines equipped with PullClean cleaning system
Figure 12
■ Remove the vacuum hose (1).
■ Use the lever (2) to remove the cover (3) together with the primary filter.
■ Remove the filter holder (4).
■ Disassemble the filters (6) from the holder by turning them counter-clockwise.
■ Assemble the new filters (6) by turning them clockwise and check the gasket (5) is not torn or broken, otherwise replace it.
■ Install the cover and the primary filter in the reverse order of removal.
[ NOTE ]
The cartridges must be fully tightened by hand; check that cartridge gasket is tightened against the upper support. In any case, do not apply a tightening torque higher than 12 Nm.
Primary cartridge filter replacement, for machines equipped with InfiniClean cleaning system
Figure 13
■ Disassemble the connector (1).
■ Remove the vacuum hose (2).
■ Remove the blower hose (3).
■ Use one of the levers (4) to disassemble the InfiniClean unit (5) together with the filter protections.
■ Disassemble the old filters (6) from the guards by turning them counter-clockwise.
■ Assemble the new filters (6) on the guards by turning them clockwise.
■ Install the InfiniClean unit in the container by performing the procedure in the reverse order.
[ NOTE ]
The cartridges must be fully tightened by hand; check that cartridge gasket is tightened against the upper support. In any case, do not apply a tightening torque higher than 12 Nm.
Primary cartridge filter replacement, for machines equipped with automatic cleaning system
CAUTION!
Before performing any operation on the filter assembly, shut off the compressed air supply to the tank and vent off all the air from the tank, through the tap. Stand well back to prevent air from blasting into the face.
Figure 14
- Vacuum hose
- Clamp
- Cap
- Release lever
- Filter ring
- Cartridge assembly
- Power supply cable
- Pneumatic supply connection
- Junction
- Connector
- Tank fastening screws
- Cartridge fastening screws
- Cartridges
■ Loosen the clamp (2).
■ Remove the vacuum hose (1).
■ Operate the levers (4).
■ Remove the cover (3) and the filter ring (5).
■ Disconnect the power supply cable (7) and the compressed air supply from the air intake coupling (8).
■ Remove the cartridge assembly (6).
■ Disconnect the connectors (10) and the union (9).
■ Disassemble the air tank by operating on the screws (11).
■ Unlock the fastening devices (12) and lift the cartridges (13), paying attention to the dust on them and place them in a plastic bag.
Upstream absolute filter replacement
Figure 15
■ Loosen the knob (1) and turn the arm (2) counterclockwise to remove the container (4) from the machine and lock it by tightening the knob (1).
■ Loosen the knob (3) to release the absolute filter (5).
■ Let the absolute filter drop on the bottom of the bag (7).
■ Close the bag with the relevant clamps and cut.
- Insert the new absolute filter (5) inside the new bag (7) with the flange looking upwards.
■ Fasten the new bag (7) to the container (4) with the new ring for bag (6).
■ Remove the old ring for bag (6) with the bag (7) from the container (4) and move it to the filter flange.
■ Overturn the absolute filter (5) inside the bag (7) in order to move to the bottom part of the bag the end part of the old bag and the corresponding rubber ring.
■ Lift the absolute filter (5) from the bottom of the bag and place it inside the container (4) then slightly tighten the knob (3) so that the absolute filter (5) is supported.
■ Roll up the bag (7) in order to remove the air inside; it must be as flat as possible under the absolute filter flange (5).
■ Fasten the absolute filter (5) by tightening the knob (3).
■ Loosen the knob (1), turn the arm (2) clockwise in order to insert the container (4) in the machine, then lock the arm (2) with the knob (1).
Downstream absolute filter replacement
Figure 16
■ Unscrew the knob (1), and remove the cover (2).
■ Remove the absolute filter (3) and place it in a plastic bag, close the bag hermetically and dispose of the filter in accordance to the laws in force.
■ Insert a new absolute filter (3) with the same filtering characteristics as the removed one.
■ Reinstall the cover (2) by fastening it with the knob (1).
Installation, cleaning and replacement of the separator (optional)
Figure 17
[ NOTE ]
Instructions describing how to fit the optional kits and the relative operation and maintenance manuals are supplied together with the optional kits.
[ NOTE ]
If there is only a dust deposit on the separator (4) allow the dust to drop through the central hole.
The separator (4) should first be disassembled in order to be perfectly cleaned:
■ Release the closing hooks (1) of the cover (2) and remove the cover.
■ Remove the filter.
■ Unscrew the two screws (3) and remove it from the container.
■ Replace the part if it is excessively worn.
■ Reinstall the separator (4).
■ Lock it and fix it by means of the two screws (3).
■ Fit the filter back in place, close the cover (2) and lock it by means of the two the closing hooks (1).
Tightness inspection
Hoses check
Figure 18
Make sure that connecting hoses (1) are in a good condition and correctly fixed.
If the hoses are damaged, broken or badly connected to the unions, they must be replaced.
When sticky materials are treated, check for possible clogging along the hose, in the inlet and on the baffle plate inside the filtering chamber.
To clean, scrape the inlet (2) from the outside to remove deposits.
Filtering chamber gasket check for machines equipped with dust container
Figure 19
If the gasket (2) between the container (3) and the filtering chamber (1) is torn, broken, etc. replace the gasket (2).
Disposal
The crossed-out wheeled bin symbol on the equipment indicates that used electrical and electronic equipment must be collected and disposed of separately from household waste. The correct disposal of the equipment will help prevent potential negative consequences for the act and human health.
Electrical and electronic household equipment must be disposed of at the separate collection points in the residence area. Please note that commercial electrical and electronic equipment should be disposed of separately from the municipal waste stream. We will be pleased to inform you about suitable disposal options.
Wiring diagrams
Figure 20
[ NOTE ]
In the case of machines equipped with an electrical control panel, refer to the paper wiring diagram supplied with the machine documentation.
Troubleshooting
| Problem Cause Remedy | ||
| The machine does not start Lack of power supply | Check for power at the socket.Check the condition of the socket and the cable.Ask for assistance to be performed by a qualified manufacturer's technician. | |
| The machine revolutions increase | Clogged primary filterClogged vacuum hose | Use the filter shaker (models with manual filter shaker). Replace it if this is not sufficient.Check the vacuum hose and clean it. |
| Dust leaks from the machine | The filter is torn Replace it with another of identical type.Inadequate filter | Replace it with another of a suitable category and check. |
| The vacuum cleaner suddenly stops. Circuit breaker activation | Check the setting.Check the motor electrical input. Contact an authorised after-sales service centre if necessary. | |
| The vacuum cleaner blows instead of vacuuming | Incorrect connection to the electrical mains | Ask for assistance from qualified personnel to perform the correct phase connection. |
| Electrostatic current on the machine Missing or inefficient grounding | Check all ground connections. In particular on the vacuum inlet fitting; replace the hose with an antistatic hose. | |
GB
Recommended spare parts
The following is a list of spare parts that should be kept ready at hand in order to speed up maintenance operations.
Refer to the manufacturer's spare parts catalogue when ordering spare parts.
| Name | Model | |||
| VHW32x VHW42x VHW44x | ||||
 | Star filter kit (ST LC) Z8 17079 Z8 17080 | |||
| Star filter kit (ST FM) Z8 17244 Z8 17245 | ||||
| Star filter kit (ST ATEX) Z8 17508 Z8 17509 | ||||
| [30CK] | Cartridge filter kit (L/M) 4081701065 | |||
| Cartridge filter kit (H) 4081701070 4081701065 | ||||
| Cartridge filter kit (L/M ATEX) 4081701020 | ||||
| Cartridge filter kit (C) Z8 33140 | ||||
| Cartridge filter kit (CP) Z8 33258 | ||||
| Cartridge filter kit (IC) 4081701065 | ||||
| Cartridge filter kit (IC ATEX) 4081701020 | ||||
 | Filter ring gasket | 4081701040 4081701093 | ||
 | Stainless steel filter ring gasket | 4081701041 4081701094 | ||
 | Filter chamber gasket | Z8 17074 Z8 17075 | ||
 | Upstream absolute filter | 4089100403 4089100520 | ||
| Downstream absolute filter H14 | Z8 17262 | 4081701076 | ||
| Downstream absolute filter U15 | 4081701068 | - | ||
 | Paper Bag (DS - 5 pcs) | 4084001003 | 81584000 | |
 | Plastic Bag (PBS) | Z8 40099 | ||
| Plastic Bag (PBS ACD/ATEX) | Z01769505 | |||
| [HDBK] | Safe Bag (SBS) | 4084001467 | ||
| Safe Bag (SOBS - 5 pcs) | 4089101051 | |||
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Technical line drawing of a vacuum cleaner with labeled component (no text or symbols beyond label)
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| 2006/42/EC | EN 60335-1:2012+A11.2014+A13.2017 EN 60335-2:69.2012 EN 12100:2011 |
| 2014/30/EU | EN 61000-3-2:2014 EN 61000-3-3:2013 EN 61000-6-2:2019 EN 61000-6-8:2019 |
| 2011/65/EU | EN 63000:2018 |
