BWT Multipur M Backwash Filter
Installation and Operating Manual
Welcome
Thank you for choosing a BWT appliance. This manual provides essential information for the safe and proper installation, operation, maintenance, and troubleshooting of your Multipur M backwash filter.
1 Safety Instructions
1.1 General Safety Instructions
This product is manufactured according to recognized regulations and technical standards. However, personal injury or property damage can occur if these instructions are not followed. Always read this documentation thoroughly before working with the product. Ensure it is accessible to all users. Hand over the product to third parties with the complete documentation. Follow all instructions for proper handling. If damage to the product or mains supply is detected, stop operation immediately and notify a service technician. Use only BWT-approved accessories, spare parts, and consumables. Adhere to the specified environmental and operating conditions. Use personal protective equipment. Only perform tasks described in this manual or for which you have been trained by BWT. Perform all tasks in compliance with applicable standards and provisions. Instruct the operator on the product's function, operation, and maintenance, as well as potential dangers.
1.2 Scope of the Documentation
This documentation applies exclusively to the product with the production number listed in Chapter 12. It is intended for operators, installers (trained and untrained by BWT), and BWT service technicians. It provides information for safe fitting, startup, operation, use, maintenance, and troubleshooting.
1.3 Personnel Qualifications
Installation requires basic knowledge of mechanics, hydraulics, and electrical systems. Installation must be performed by a qualified specialist or a trained person under a specialist's guidance. A qualified specialist can assess risks and implement safety measures based on training and experience. An instructed person is trained by a specialist regarding tasks, potential risks, and necessary protective equipment.
1.4 Transport and Installation
To avoid transport damage, do not remove the product from packaging until at the installation site. Dispose of packaging properly. Check delivery completeness. If there is a risk of frost, drain all water-carrying components. Lift or transport the product only by designated suspension eyes or attachment points. Install on a strong, level horizontal surface, secured against falling or tipping.
1.5 Symbols Used
- ♲ This symbol indicates the product's recyclability.
- ⚠ This symbol indicates important information or instructions for safe operation.
- ⚠ This symbol indicates general risks to persons, units, or the environment.
1.6 How Safety Instructions Are Displayed
Safety instructions precede actions that could cause harm. All hazard prevention measures must be followed. Safety instructions are displayed with a signal word (e.g., "DANGER", "WARNING", "CAUTION"), a color code, and a description of the hazard and necessary measures.
1.7 Product-Specific Safety Instructions
Product-specific safety instructions are provided in relevant sections. For example, the optimal operating pressure is between 2-8 bar, and pressures above 8 bar result in high backwash water volume.
2 Scope of Supply
The Multipur M backwash filter consists of:
- Handwheel
- Pressure gauge
- Filter housing made of red brass
- Date indicator ring
- Water outlet for pipe
- Water outlet for hose (20 mm Ø)
- Security valve
- Cover
3 Use
3.1 Intended Use
The Multipur backwash filters are used for filtering drinking and industrial water to protect water mains, fittings, equipment, machinery, tanks, boilers, and production facilities from malfunctions and corrosion caused by foreign particles. They can also be used for well, process, boiler feed, cooling, and air conditioning water, with specialist advice. The filters are unsuitable for oils, greases, solvents, soaps, lubricating media, and water-soluble substances.
3.2 Foreseeable Misuse
Operating the system with parameters other than specified, not adhering to maintenance intervals, or using non-BWT approved spare parts and consumables constitutes misuse.
3.3 Disclaimer
The manufacturer is not liable for issues arising from the removal or modification of safety devices, wilful modification of the system, or failure to follow instructions.
3.4 Other Applicable Documentation
Observe all supplier documents included with delivery. These are part of this documentation and must not be altered or removed.
4 Function
Untreated water flows through a stainless steel filter element, retaining foreign particles. During backwashing, the rinsing water outlet opens, and suction ring segments clean the filter fabric with clean water at high flow rate. Backwashing is performed by turning the handwheel to the stop and back.
5 Preliminary Installation Conditions
Observe local plumbing codes, general guidelines, and technical data. Installation must be performed by the water supply utility or an approved plumbing company. The installation site must be frostproof and protected from solvent vapors, heating oil, acidic cleaners, chemicals, UV radiation, and heat over 40°C. Pressure fluctuations must not exceed nominal pressure. Positive pressure surges should not exceed 2 bar, and negative pressure surges should not be less than 50% of the self-adjusting flow pressure (DIN EN 806-2). If water contains particles > 2 mm, install a coarse dirt trap upstream. A flushing water quantity of at least 1.7 l/s (6 m³/h) and a pressure of min. 2.5 bar are required for backwashing. A suitable drainage connection is necessary for rinsing water discharge. Avoid extreme pressure surges.
6 Installation
Install the backwash filter horizontally in the cold water line, following the flow direction arrow. Assemble pressure gauges. Screw on the waste water connection and connect the drain line.
7 Commissioning
Check the filter and rinsing water line for correct installation and leakage. Turn the handwheel clockwise to the stop for the first backwashing. Close the flushing water outlet. Open shut-off valves upstream and downstream. Vent the pipeline. The filter is ready for operation.
8 Operation
Backwash the filter when the maximum permissible pressure difference (1.2 bar) is reached, or at least once a month. Turn the handwheel counterclockwise to the upper stop to backwash, and clockwise to close. Set the date for the next backwash on the date ring.
9 Maintenance
Regular maintenance by specialist staff is required. Consider a maintenance contract. Maintenance should be performed annually, or twice annually for municipal systems, by a plumber or manufacturer.
9.1 Replacement of Wearing Parts
| Part | Replacement Interval |
|---|---|
| O-Ring | every 3 years |
| Backwashing element | every 6 years |
| Spindle guide | every 6 years |
| Filter element | every 6 years |
| Hose barb | every 9 years |
| HT-Connector | every 9 years |
| O-Ring | every 9 years |
9.2 Troubleshooting
| Fault | Cause | Action |
|---|---|---|
| Water pressure dropped considerably in network. | Dirty filter element. | Carry out backwash. |
| Flushing water outlet does not close. | Backwash element does not reach the end position due to large particles of dirt. | Repeat backwash several times. |
| Flushing water outlet leaks. | Defective seal. | Pull cover plate down and close flushing water outlet with safety stop valve. Have seal replaced by a specialist firm. |
If faults persist, contact the after-sales service department.
10 Warranty
For malfunctions during the warranty period, contact your after-sales service department, providing the unit type and product number.
11 Decommissioning and Disposal
11.1 Decommissioning
The product must only be shut down and dismantled by qualified specialists, observing all safety regulations.
11.2 Disposal
♲ At the end of the product's life cycle, ensure proper disposal or recycling. Observe legal disposal guidelines for the country of use. Materials used: metal, plastic.
12 Technical Data
Multipur M Series
| Type | DN | 65 | 80 | 100 | 125 | 150 |
|---|---|---|---|---|---|---|
| Nominal connection width | DN | 65 | 80 | 100 | 125 | 150 |
| Connection type | Flange connection DIN 2501, Part 1 | |||||
| Flange Ø | mm | 145 | 160 | 180 | 210 | 240 |
| Flangebore Ø | mm | 18 | 18 | 22 | 22 | |
| Nominal flow | m³/h | 58 | 82 | 91 | 105 | |
| Flow capacity at Δp = 0.2 bar | m³/h | 35 | 56 | 57 | 61 | |
| Flow capacity at Δp = 0.5 bar | m³/h | 58 | 82 | 91 | 105 | |
| Micron rating | µm | 90/110 or 190/210 available | 90/110 | |||
| Nominal pressure (PN) | bar | 10 | ||||
| Operating pressure p₀ min./max. | bar | 2 – 10 | ||||
| Recommended operating pressure | bar | 2 – 8 | ||||
| Water temperature, min./max. | °C | 5 – 30 | ||||
| Ambient temperature, min./max. | °C | 5 – 40 | ||||
| Rinsing water volume at 4 bar | l | 16 (10 s) | 24 (10 s) | 30 (10 s) | ||
| Water flow at backwashing | l/h | 5000 | 8600 | 10000 | ||
| Drainage connection, min. | DN | 50 | 75 | 75 | ||
| Operating weight, approx. | kg | 15 | 18 | 24 | 33 | 38 |
| Shipping weight, approx. | kg | 13 | 16 | 21 | 28 | 32 |
| Production number (100 µm) | PNR | 6-371019 | 6-371020 | 6-371032 | 6-371033 | 6-371034 |
| Production number (200 µm) | PNR | 6-371017 | 6-371018 | – | – | – |
12.1 Overall Dimensions
| Type | 65 | 80 | 100 | 125 | 150 | |
|---|---|---|---|---|---|---|
| Overall height | mm | 600 | 660 | 740 | 740 | |
| Height, top edge to centre of tube (H1) | mm | 230 | 230 | 230 | 230 | |
| Height, lower edge to centre of tube (H2) | mm | 370 | 430 | 510 | 510 | |
| Minimum distance, centre of tube to ceiling (H3) | mm | 300 | 300 | 300 | 300 | |
| Minimum distance, centre of tube to floor (H4) | mm | 400 | 450 | 640 | 640 | |
| Minimum distance, centre of tube to wall | mm | 100 | 105 | 115 | 130 | 145 |
| Installation length (L) | mm | 220 | 220 | 220 | 220 | 220 |
12.2 Volume Flow Rate and Pressure Loss
Multipur M DN 65
| Volume flow rate [m³/h] | 15 | 22 | 35 | 44 | 51 | 58 | 72 | 81 |
|---|---|---|---|---|---|---|---|---|
| Pressure loss Δp [bar] | 0.05 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.8 | 1.0 |
Multipur M DN 80
| Volume flow rate [m³/h] | 15 | 22 | 35 | 44 | 51 | 58 | 75 | 85 |
|---|---|---|---|---|---|---|---|---|
| Pressure loss Δp [bar] | 0.05 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.8 | 1.0 |
Multipur M DN 100
| Volume flow rate [m³/h] | 29 | 41 | 56 | 67 | 75 | 82 | 102 | 114 |
|---|---|---|---|---|---|---|---|---|
| Pressure loss Δp [bar] | 0.05 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.8 | 1.0 |
Multipur M DN 125
| Volume flow rate [m³/h] | 26 | 38 | 57 | 70 | 81 | 91 | 116 | 132 |
|---|---|---|---|---|---|---|---|---|
| Pressure loss Δp [bar] | 0.05 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.8 | 1.0 |
Multipur M DN 150
| Volume flow rate [m³/h] | 25 | 40 | 61 | 79 | 93 | 105 | 137 | 155 |
|---|---|---|---|---|---|---|---|---|
| Pressure loss Δp [bar] | 0.05 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.8 | 1.0 |
12.3 Pressure Loss Curves
Pressure loss curves for Multipur DN 65, DN 80, DN 100 are provided graphically.
Pressure loss curves for Multipur DN 125, DN 150 are provided graphically.
12.4 Type Label
The type label identifies the product. For inquiries, have the following information ready: 1. Device name, 2. Serial number/Year of manufacture, 3. Production number/Order-no. The type label is an official document and must not be altered or removed. Damaged or unreadable labels must be replaced.
13 Standards and Legal Provisions
Standards and legal provisions apply in their most recent versions. When installing and operating the filter, observe:
- DIN 19628-2007: Mechanical filters for drinking water installations.
- EN 806: Specifications for installations inside buildings conveying water for human consumption.
- DIN 1988-200: Codes of practice for drinking water installations.
- DIN EN 13443-1: Water conditioning equipment inside buildings - Mechanical filters - Part 1: Particle rating 80 µm to 150 µm - Requirements for performance, safety and testing.
- German ordinance on the quality of water for human consumption (“Trinkwasserverordnung”).
- German Federal Water Act (“Wasserhaushaltsgesetz”).
- German act for promoting closed substance cycle waste management and ensuring environmentally compatible waste disposal (“Kreislaufwirtschafts- und Abfallgesetz”).
Contact Information
For further information, please contact:
BWT Austria GmbH
Walter-Simmer-Straße 4
A-5310 Mondsee
Phone: +43 / 6232 / 5011 0
Fax: +43 / 6232 / 4058
E-Mail: office@bwt.at
BWT Wassertechnik GmbH
Industriestraße 7
D-69198 Schriesheim
Phone: +49 / 6203 / 73 0
Fax: +49 / 6203 / 73 102
E-Mail: bwt@bwt.de
www.bwt-group.com
