Metabo ASR 25 L SC / ASR 50 L SC / ASR 25 M SC / ASR 50 M SC Dust Extractors

Original Instructions

This document provides original instructions for the Metabo ASR series dust extractors.

Declaration of Conformity

Metabo declares that the dust extractors, identified by type and serial number, meet all relevant requirements of directives and standards. Technical documents are available as referenced.

For UK only: Metabo, as manufacturer and authorized person, declares under sole responsibility that these dust extractors fulfill all relevant UK regulations and designated standards.

Specified Use

ASR 25 L SC, ASR 50 L SC:

Suitable for vacuuming dust, solid materials (e.g., broken glass, nails), and liquids of any kind, with the exception of highly inflammable, combustible liquids, and materials hotter than 60 °C. Also suited for separating dry, non-flammable dust, non-flammable liquids, wood dust, and dangerous dust with workplace limit values > 1 mg/m³.

ASR 25 M SC, ASR 50 M SC:

Suitable for extracting harmful dust in dust class M, as per EN 60335-2-69. Suited for separating dry, non-flammable dust, non-flammable liquids, wood dust, and dangerous dust with workplace limit values ≥ 0.1 mg/m³.

For occupational exposure limits and carcinogenic materials, consult local professional and accident prevention associations.

The vacuum cleaner is suitable for use as:

• Industrial vacuum cleaner (IS) for vacuuming deposited dust.
• Dust extractor (ENT) for extracting airborne dusts from material processing machines.

Suitable for demanding requirements in industrial and commercial applications such as craft, trade, installation, construction, industry, workshops, painting, plastering, joinery, and woodworking.

Important Restrictions:

• Not designed for use by persons with physical, sensory, or mental disabilities, or insufficient experience/knowledge, unless supervised or instructed.
• Observe country-specific regulations and material producer specifications.
• Designed for industrial use only.
• Do not vacuum dust containing asbestos.
• Do not vacuum inflammable dust.
• Do not vacuum inflammable or explosive solvents, solvent-saturated material, dust with explosion hazard, liquids like petrol, oil, alcohol, thinner, or material hotter than 60 °C. This can cause explosion and fire hazards.
• Do not use the appliance near inflammable gases or substances.
• The user is solely responsible for any damage caused by improper use.
• Observe generally accepted accident prevention regulations and safety information.

General Safety Instructions

Before using the machine, carefully read and familiarize yourself with all enclosed safety information and Operating Instructions. Keep all documentation for future reference.

Before using the appliance, the user must receive information, instructions, and training material on its use and the materials for which it is intended, including safe disposal of extracted material.

Warning: If any foam or water egresses, switch off immediately. Empty the container and, if necessary, the pleated filter.

• Never sit or stand on the appliance.
• Always set up the connection lead and hose to prevent tripping hazards.
• Do not pull the connection lead over sharp edges, kink, or pinch it.
• If the connection lead is damaged, it must be replaced by a special connection lead (see chapter on Repairs).
• Always connect to a socket with protective contact.
• Do not use damaged extension leads.
• Never insert or remove the mains plug with wet hands.
• Only pull on the mains plug, not the lead.
• Warning: The plug socket on the appliance must only be used for purposes defined in the Operating Instructions.
• Do not leave the appliance unattended. Disconnect the mains plug during long work interruptions.
• The vacuum cleaner must not be used or stored outdoors in wet conditions.
• Important: This machine must only be stored indoors.
• Acids, acetone, and solvents can corrode appliance components.

Special Safety Instructions

For your own protection and the protection of your vacuum cleaner, pay attention to all text marked with this symbol: ⚠️

• Never allow children to use the machine.
• Children should be supervised to ensure they do not play with the device.
• Caution: Only use accessories included with the appliance or specified in the Operating Instructions. Using other accessories may impair safety.
• Do not perform any work other than described here.
• In case of misuse, improper operation, or unprofessional repair, no liability is assumed for any damage incurred.
• When the appliance is not in use, leave the hose on the appliance to prevent dust accidentally escaping. For ASR 25 M SC, ASR 50 M SC, seal the suction opening (12) with a sealing plug (11) and join the hose ends to prevent dust escaping.
• Do not operate appliances or accessories under the following conditions:
• If the appliance has recognisable damage (cracks/breaks).
• If the mains connection lead is defective or shows signs of cracking or ageing.
• If there is a suspected non-visible defect (after a fall).
• Do not point the nozzle, hose, or tube at people or animals.

Warning: If any foam or water egresses, switch off immediately. Empty the container and, if need be, the pleated filter.

Never sit or stand on the appliance.

Always set up the connection lead and hose so there is no danger of tripping.

Do not pull the connection lead over any sharp edges and do not kink or pinch it.

If the connection lead of the appliance is damaged, it must be replaced by a special connection lead. See the chapter on Repairs.

Always connect to a socket with protective contact.

Do not use any damaged extension leads.

Never insert or remove the mains plug with wet hands.

Only pull on the mains plug, not on the lead.

Warning: The plug socket on the appliance must be used only for the purposes defined in the Operating Instructions.

Do not leave the appliance unattended. If there is a long work interruption, disconnect the mains plug.

The vacuum cleaner must not be used or stored outside in wet conditions.

Important: This machine must only be stored indoors.

Acids, acetone and solvents can corrode the appliance components.

General Cleaning and Maintenance Safety:

Prior to any servicing work, clean the appliance. Switch off the appliance after each use and pull out the mains plug.

Steam cleaners and high-pressure cleaners must not be used to clean the vacuum cleaner.

The inside of the cover must always be kept dry.

Mould contamination can result if the appliance is not cleaned for an extended period, especially if used in areas where foodstuffs are processed: Always clean and disinfect the vacuum cleaner immediately after use.

Never open the appliance outdoors during rain or storms.

The appliance must not be operated in areas with an explosion hazard.

Ensure that the vacuum cleaner is steady.

If the extracted air is discharged into the room, ensure there is an adequate air change rate (L) in the room. Observe the regulations that apply in your country.

Caution: This appliance contains dust that is harmful to health. Discharge and maintenance operations (including disposal of the dust collection containers) must only be carried out by qualified specialists wearing appropriate protective clothing and equipment.

Warning - general danger!

Caution: Do not use the appliance until you have read the Operating Instructions.

Special safety instructions for ASR 25 M SC, ASR 50 M SC (Dust Class M):

Warning sign for machines with dust class M: [Image of M dust class warning symbols]

During discharge and maintenance operations, note the following:

• Clean the appliance before opening it. Wear a dust mask.
• Avoid covering third parties with dust. Provide local filtered forced ventilation. Then clean the maintenance area.
• Do not operate the appliance without the complete filtration system (filter cassettes and PE filter bags or fleece filter bags).
• The appliance meets electrical safety requirements relating to the extraction of a water-air mixture.

Special safety instructions for ASR 25 L SC, ASR 50 L SC (Dust Class L):

Warning sign for machines with dust class L: [Image of L dust class warning symbols]

While the appliance is suitable for extracting substances that pose a slight threat to health, it is not appropriate for reducing wood dust in inhaled air.

Dust from material such as paint containing lead, some wood species, minerals, and metal may be harmful. Contact with or inhalation of the dust may cause allergic reactions and/or respiratory diseases to the operator or bystanders. Certain kinds of dust are classified as carcinogenic, such as oak and beech dust, especially in conjunction with additives for wood conditioning (chromate, wood preservative).

Overview

Refer to page 3 for a detailed overview.

1. Rotary switch On/Off/Automatic/SelfClean (SC)
2. Volume flow control display
3. Plug socket for power tool
4. Rotary switch for selecting the extraction hose diameter *
5. PE filter bag *
6. Fleece filter bag*
7. Cable holder
8. Upper part
9. Snap lock
10. Bottom part
11. Suction opening
12. Sealing plug (for ASR 25 M SC, ASR 50 M SC only) *
13. Locking knob
14. Locking bar (for opening the hood to change filter cassettes)
15. Motor protection filter
16. Filter cassette (according to IFA C)

* Depending on equipment/not included in scope of delivery.

Initial Operation

Before plugging in the device: Check that the rated mains voltage and mains frequency, as specified on the rating label, match your power supply.

6.1 Securing the sealing plug (for ASR 50 M SC only)

Fit the chain of the sealing plug (12) in the bore of the suction opening (11).

6.2 Fitting wheels (if necessary)

Insert the axles of the guide rollers in the holes in the container until they engage. Fit the large wheels as shown.

6.3 Inserting a Fleece Filter Bag

Recommended for applications with small amounts of fine dust (e.g., spot-grinding, grinding paint/lacquer, drilling applications with small diameters < 10 mm) and use with machines like routers, planers, small grinding machines.

Procedure:

1. Switch off the appliance, remove the mains plug, and open the snap locks (9).
2. Remove the upper part (8) from the container (10).
3. For ASR 50 M SC: On the inside of the suction opening, push the red rotary slide with its "triangle" marking upwards. (To twist the slide, push it slightly towards the suction hose, and pull it back after twisting).
4. For ASR 25 M SC: Turn the red rotary switch (on the inside of the suction opening) until the stop: the text "CLOSE" shows upwards to the marking ⚠️.
5. Holding the new fleece filter bag by the flange, slide the bottom part over the suction connection, and the top part over the latch pin.
6. Replace the upper part of the appliance on the container and close the snap locks.

6.4 Inserting PE filter bag (for ASR 50 M SC only)

PE filter bags (5) are suitable for both wet and dry vacuuming. Recommended for applications where larger amounts of dust are created (e.g., removal of plaster surfaces, spot-grinding, grinding of screeds) and use with machines like renovation milling machines, grinders, drywall grinders, wall grinders.

When using a PE disposal bag, the filter cleaning must be switched on (function AR / IR) for corresponding materials.

Procedure:

1. Switch off the appliance, remove the mains plug, and open the snap locks (9).
2. Remove the upper part (8) from the container (10).
3. For ASR 50 M SC: On the inside of the suction opening, push the red rotary slide with its "circle" marking upwards. (To twist the slide, push it slightly towards the suction hose, and pull it back after twisting).
4. For ASR 25 M SC: Turn the red rotary switch (on the inside of the suction opening) to the stop: the text "OPEN" shows upwards to the marking ⚠️.
5. Hold the PE filter bag (5) on the flange and, with its opening, guide it first over the latch at the bottom part of the suction opening, then fit up to the stop on the suction opening.
6. Spread out the PE filter bag (5) evenly across the container floor. Arrange the edges of the PE filter bag around the container rim so that the bag is firmly clamped on all sides by the upper part (8), once replaced.

Volume flow monitoring: If an average air flow rate of 20 m/s in the hose system (35 mm diameter) is undershot, the volume flow control display (2) flashes, indicating the fleece filter bag needs changing or the vibrator needs actuating.

The Appliance

7.1 Switching On/Off, Automatic, Vibrator

Select operating mode at switch (1):

• 0 = Vacuum cleaner off
• I = Vacuum cleaner on (manual operation)
• A = Automatic On/Off switch: The vacuum cleaner is switched on or off by means of a power tool connected to the mains socket (3).
• R A = Automatic On/Off switch and Automatic vibrator switch:
• If switch (1) is turned to position R A, the electromagnetic vibrator switches on to shake dust off the filter. The vibrator switches off automatically after approx. 10 s.
• In switch position R A, the vacuum cleaner is switched on or off by means of a power tool connected to the mains socket (3).
• In switch position R A, the electronic system checks the air flow. If the flow is too low due to a contaminated filter, the "Filter control" lamp (2) lights up. During the next work break of the connected power tool, the electronics system switches the vibrator off for approx. 10 s.

Note: If the suction hose diameter is 19 mm or less, and flow conditions are unfavorable, the volume flow control display (2) may flash and an acoustic signal may sound even if the fleece filter bag does not need emptying. In this case, lay out the hose straight and clean it.

Note: If you need to turn the rotary switch to a lower value due to a machine generating dust (e.g., small suction canal diameter), there is no guarantee that dust will be conveyed adequately. The suction hose must be removed from the dust-generating machine after every operating sequence to be vacuumed clear.

7.2 Power socket (3)

The power socket (3) is designed for connection to a power tool only.

The total maximum permissible current consumption (of vacuum cleaner and connected unit) must not exceed the value Imax (see table, page 3).

Caution: Ensure the power tool is switched off when plugging it in. Regardless of the switch position, the plug socket is always live when the mains plug is plugged in.

If switch (1) is in the "0" position, the plug socket can be used as an extension lead.

If switch (1) is in the "RA" position, the vacuum cleaner is switched on or off by a power tool connected to the mains socket (3).

7.3 Volume flow control display

The volume flow control display lights up when the container is full and/or if the suction hose is blocked. For ASR 25 M SC, ASR 50 M SC, an acoustic signal is also issued.

7.4 Rotary switch for setting the suction hose diameter (ASR 25 M SC, ASR 50 M SC only)

Adjust the rotary switch (4) to the hose diameter of the suction hose fitted.

The volume flow is monitored if switch (1) is at the "RA", "A", or "I" position.

If the volume flow falls below a set value, the filter cassettes are automatically vibrated during work breaks in position RA. If the value remains too low, the volume flow control display lights up and, in switch position "RA", an acoustic signal sounds to indicate that the container must be emptied, or the fleece filter bag (6) or PE filter bag (5) must be replaced.

Volume flow rates:

• dia. 35 mm: 70 m³/h
• dia. 27 mm: 41 m³/h
• dia. 19 mm: 20 m³/h

Use

8.1 Dry Vacuuming

Vacuum using a dry filter, dry appliance, and dry accessories only. If the cartridge is damp, dust may stick and form a crust.

Always use filter cassettes when using fleece filter bags (6) or PE filter bags (5) (16).

8.2 Wet vacuuming

Never operate the machine without inserting a filter cassette first (16). The machine may be destroyed, and water may escape.

Vacuum without a paper filter bag. You can use either fleece filter bags (6) or PE filter bags (5). Filter cartridges (16) are suitable for wet vacuuming.

Before carrying out any wet vacuuming, remove the dry vacuumed material to prevent severe soiling and encrustation.

The integrated water sensor switches off the motor when the container is full. Empty the appliance. If the appliance is not switched off, the restart protection device remains effective. The appliance is not operable again until it has been switched off and switched back on again.

After switching off, some water may run back out of the hose.

Before emptying, first take the suction hose out of the liquid.

If you are then going to dry vacuum, insert a dry filter. If there is frequent switching between dry and wet vacuuming, use a second (replacement) filter. Allow the filter, container, and accessories to dry; otherwise, dust may adhere to damp components.

8.3 Special instructions for ASR 25 M SC, ASR 50 SC

Use as industrial vacuum cleaner (IS):

• Turn switch (1) to the "I" position.
• Adjust the rotary switch (4) to the hose diameter of the suction hose fitted.
• If the volume flow falls below the set value, the volume flow control display lights up to indicate that the container must be emptied, or that the fleece filter bag (6) or PE filter bag (5) must be replaced.

Use as a dust extractor (ENT):

• The dust extractor must not be connected to more than one dust source.
• Turn switch (1) to the "RA" position.
• Adjust the rotary switch (4) to the hose diameter of the suction hose fitted. For more detailed information, see section 7.4.
• Connect the power tool (deactivated) to the plug socket (3). See section 7.2.

8.4 Transport

For ASR 25 L SC / ASR 50 L SC: Leave the hose on the appliance to prevent dust accidentally escaping.

For ASR 25 M SC, ASR 50 M SC: Seal the suction opening (11) with a sealing plug (12) and join the hose ends to prevent dust from escaping.

Wrap the suction hose around the vacuum cleaner.

Place accessories in a suitable plastic bag and seal the bag.

Suspend the mains connection lead on the cable holder (7).

The upper part (8) must be securely sealed to the container (10) – check that the snap locks (9) are closed.

Cleaning

9.1 General Cleaning Instructions

Clean the container and accessories with water. Wipe the upper part (8) with a damp cloth.

Caution: This appliance contains dust that is harmful to health. Discharge and maintenance operations (including disposal of dust collection containers) must only be carried out by qualified specialists wearing appropriate protective clothing and equipment.

Emptying the Container

Only permitted for dusts with occupational exposure limits > 1 mg/m³.

• Unplug mains cable.
• ASR 25 M SC, ASR 50 M SC: Remove suction hose, seal suction opening (11) with sealing plug (12).
• Open the snap locks (9). Remove the upper part (7) from the container (9).

Dispose of the fleece filter bag

• Unplug mains cable.
• Pull on mask.
• ASR 25 M SC, ASR 50 M SC: Remove suction hose, seal suction opening (11) with sealing plug (12).
• Open the snap locks (9). Remove the upper part (8) from the container (10).
• Carefully pull back and remove the fleece filter bag (6) from the suction opening (11). Seal the flange of the fleece filter bag by folding over the cover.
• Dispose of the vacuumed material in accordance with legal regulations.

Disposing of the PE Filter Bag

• Insert mains plug.
• Switch on the vacuum cleaner and vibrate the filters: turn the switch (1) to the "RA" position.
• Switch off the vacuum cleaner: turn the switch (1) to the "0" position.
• Pull on mask.
• ASR 25 M SC, ASR 50 M SC: Remove suction hose, seal suction opening (11) with sealing plug (12).
• Open the snap locks (9). Remove the upper part (8) from the container (10). Before setting down the upper part, turn switch (1) to the "I" position so that any falling dust is vacuumed.
• Carefully pull back the PE filter bag (5) from the suction opening (11). Seal the flange of the PE filter bag by folding over the cover.
• Dispose of the vacuumed material in accordance with legal regulations.

9.2 Special cleaning instructions for ASR 25 M SC, ASR 50 M SC

For class M machines, the outside of the machine should be cleaned (vacuumed and wiped down), or treated with sealants before being removed from the hazardous area. All machine parts must be considered contaminated when removed from the hazardous area. Take suitable measures to prevent any dispersal of the dust. When carrying out maintenance or repairs, it is essential to dispose of any contaminated objects that cannot be adequately cleaned. These objects must be disposed of using impermeable bags and in accordance with applicable regulations for removing such waste.

Maintenance

10.1 General Instructions

Before performing any maintenance: Always switch off the machine and remove the mains plug.

Clean the appliance (see section 9).

For maintenance by the user, the vacuum cleaner must be taken apart, cleaned, and maintained, to the extent possible, without endangering maintenance staff or other people.

Preventive Measures

Appropriate preventive measures include: cleaning the appliance before disassembly; providing local filtered forced ventilation where the vacuum cleaner is disassembled; cleaning the maintenance area and providing suitable personal protective clothing and equipment.

10.2 Reduction in suction power

If the suction power decreases, carry out the following steps:

1. Clean the filter cassettes by activating the electromagnetic vibrator (set switch (1) to the "RA" position).
2. Empty the container or replace the fleece filter bag (6) or PE filter bag (5).
3. Replace the filter cassettes (16), or rinse them under running water, dry them, and then replace.

10.3 Renew the filter cartridges (16)

Shake the filter cassettes (16) once again before replacing the filters by switching on the electromagnetic vibrator (set switch (1) to the "RA" position).

Use a coin or similar object to turn the locking knob (13) on the locking bar (14) counter-clockwise through 90° and push the bar (14) to the rear. Swing up the hood and pull up the filter cartridges (16) to remove them. Seal the removed filter cassettes immediately in a dust-tight plastic bag and dispose of them in accordance with regulations. Insert new filter cartridges, ensuring they are correctly and securely in place.

10.4 Motor protection filter

Regularly check the motor protection filter. If the motor protection filter (15) is contaminated, this indicates that the filter cassettes (16) may be defective:

• Replace the filter cartridges (16).
• Replace the motor protection filter (15), or rinse it under running water, dry it, and then replace.

10.5 Water sensor

Important: Clean the water sensor regularly and check it for signs of damage.

10.6 Technical inspection

At least once a year, the manufacturer or a suitably qualified and trained person must carry out a dust test, e.g., to check for damage to the filter, verify that the appliance is air-tight, and that the control unit is functioning correctly.

For maintenance by the user, the vacuum cleaner must be taken apart, cleaned, and maintained, to the extent possible, without endangering maintenance staff or other people.

Preventive Measures

Appropriate preventive measures include: cleaning the appliance before disassembly; providing local filtered forced ventilation where the vacuum cleaner is disassembled; cleaning the maintenance area and providing suitable personal protective clothing and equipment.

When carrying out maintenance or repairs, it is essential to dispose of any contaminated objects that cannot be adequately cleaned. These objects must be disposed of using impermeable bags and in accordance with the applicable regulations for removing such waste.

Troubleshooting

If the volume flow control display (2) lights up or if an acoustic signal is sounded (ASR 25 M SC, ASR 50 M SC only), this indicates that the fleece filter bag must be emptied.

Reduction in suction power:

See the instructions in the section on Cleaning.

• Filter cassettes (16) soiled? Clean the cassettes.
• Fleece filter bag (6) full? Replace the filter bag.
• PE filter bag (5) full? Replace the filter bag.
• Container (10) full? Empty the container.
• Motor protection filter (15) clogged? - See section 10.
• Nozzle, tubes, or hose blocked? Clean.

Appliance will not start:

• Is the plug in the plug socket?
• No power from mains?
• Mains lead OK?
• Appliance hood correctly closed?
• Has the water sensor cut off? - Empty the container; then switch on and off again.
• Switch (1) in "RA / A" position? - Set to "I" position. See section 7.1.
• The vacuum cleaner is not switched on or off by means of a power tool, even though switch (1) is set to the "RA / A" position. - Connect the power tool to the plug socket (3).

Dust in the container when fleece filter bag is fitted:

• The position of the rotary slide is incorrect. See section 6.3.

PE filter bag is sucked against the filter cassettes (16):

• The position of the rotary slide is incorrect. See section 6.4.

Do not interfere with the appliance. Contact an authorized workshop or Metabo's after-sales service department (see section 13. Repairs).

Accessories

Use only genuine Metabo accessories. If you need any accessories, check with your dealer. See page 4.

Repairs

Repairs to appliances must be carried out by qualified electricians only. Use only original Metabo spare parts.

For addresses of Metabo service centres, see www.metabo.com. Spare parts lists can also be downloaded from www.metabo.com.

Environmental Protection

Metabo's packaging is 100% recyclable. Worn-out devices and accessories contain valuable raw materials and plastics that can also be recycled.

These instructions are printed on chlorine-free bleached paper.

For EU countries only: Never dispose of appliances in household waste. In accordance with European Guideline 2012/19/EU on used electronic and electric equipment, used power tools must be collected separately and returned for environmentally compatible recycling.

Technical Specifications

Explanatory notes on the specifications on page 3. Changes due to technological progress reserved.

Regional Specifications (EU, UK, AUS, CH, DK):

Compliance:

• CE 2014/30/EU, 2006/42/EC, 2011/65/EU
• EN 60335-1:2012/A11:2014, EN 60335-2-69:2012, EN IEC 63000:2018

Date: 2021/07/07

Signed: Bernd Fleischmann, Director Product Engineering & Quality

Manufacturer: Metabowerke GmbH - Metabo-Allee 1 - 72622 Nuertingen, Germany

Note on noise levels: During operation, the noise level can exceed 80 dB(A). Wear ear protectors!