The Grünbeck BOXER RX/RDX is a backwash filter designed for filtering drinking water, protecting water pipes and connected water-carrying system parts from disturbances and corrosion damage caused by undissolved impurities like rust particles and sand. The BOXER RDX model additionally features a pressure reducer for adjusting outlet pressure. These filters are designed according to DIN EN 13443-1 and DIN 19628, intended for installation in drinking water pipes downstream of the water meter, and can be used for both positive and negative pressure applications.
Function Description:
Unfiltered drinking water flows into the filter through the inlet side, passing from the outside in through the filter element to the pure water outlet. Foreign particles larger than 100 µm are retained, either sticking to the filter element or falling into the filter cylinder.
To perform a backwash, the backwash handwheel is turned to its stop, opening the drain. Water then flows through the primary screen to the filter element and in the opposite direction to normal filtration. This process detaches particles from the filter element, washing them out to the drain.
The BOXER RDX model includes a flow-optimized pressure reducer, designed according to DIN EN 1567, which allows the outlet pressure on the withdrawal side to be set between 1 and 6 bar (factory setting: 4 bar). This adjustment only functions within the positive pressure range.
Important Technical Specifications:
The BOXER RX/RDX filters are available in ¾", 1", and 1¼" nominal connection diameters.
BOXER RX:
- Nominal flow at Δp 0.2 (0.5) bar:
- DN 20 (¾"): 2.9 (4.7) m³/h
- DN 25 (1"): 3.8 (5.9) m³/h
- DN 32 (1¼"): 4.2 (6.7) m³/h
- Kv value:
- DN 20 (¾"): 6.7 m³/h
- DN 25 (1"): 8.4 m³/h
- DN 32 (1¼"): 9.6 m³/h
- Pore size: 100 µm
- Largest/smallest pore size: 120/80 µm
- Operating pressure: 2-16 bar
- Nominal pressure: PN 16
- Backwash water volume at an inlet pressure of 4 bar: ~4 l
- Water temperature: 5-30 °C
- Ambient temperature: 5-40 °C
- Installation height up to centre of connection (A): 270 mm
- Installation length with/without screw connection (B):
- DN 20: 185/100 mm
- DN 25: 182/100 mm
- DN 32: 191/100 mm
- Distance to wall (C): ≥ 60 mm
- Installation depth up to centre of connection (D):
- DN 20: 115 mm
- DN 25: 120 mm
- DN 32: 125 mm
- Total height (E): 310 mm
- Empty weight:
- DN 20: ~1.7 kg
- DN 25: ~1.9 kg
- DN 32: ~2.2 kg
BOXER RDX:
- Flow rate as per DIN EN 1567:
- DN 20 (¾"): 2.3 m³/h
- DN 25 (1"): 3.6 m³/h
- DN 32 (1¼"): 5.8 m³/h
- Pore size: 100 µm
- Largest/smallest pore size: 120/80 µm
- Operating pressure: 2-16 bar
- Nominal pressure: PN 16
- Backwash water volume at an inlet pressure of 4 bar: ~4 l
- Water temperature: 5-30 °C
- Ambient temperature: 5-40 °C
- Installation height up to centre of connection (A): 290 mm
- Installation length with/without screw connection (B):
- DN 20: 185/100 mm
- DN 25: 182/100 mm
- DN 32: 191/100 mm
- Distance to wall (C): ≥ 60 mm
- Installation depth up to centre of connection (D):
- DN 20: 160 mm
- DN 25: 165 mm
- DN 32: 170 mm
- Total height (E): 330 mm
- Empty weight:
- DN 20: ~2.0 kg
- DN 25: ~2.2 kg
- DN 32: ~2.5 kg
Usage Features:
- Installation: The filter can be installed in horizontal or vertical water pipes, downstream of the water meter and upstream of distribution pipes and appliances. Installation must be carried out by a qualified specialist. The installation site should be frost-proof, protected from chemicals, dyes, solvents, direct sunlight, and heat sources. It requires adequate illumination, ventilation, and easy accessibility for maintenance. A floor drain is recommended; if unavailable, a safety device must be installed to prevent water damage.
- Operation: The filter operates automatically and generally does not require manual intervention.
- Pressure Reducer (BOXER RDX): The outlet pressure can be adjusted using the handwheel (clockwise for increase, counter-clockwise for reduction). After adjustment, opening and closing a water withdrawal point allows the pressure to settle. The actual outlet pressure can be read on the pressure gauge. The factory setting is 4 bar.
- myProduct App: Users can register their product with the Grünbeck myProduct app to receive reminders for timely backwash and additional product information. Registering the product extends the warranty by 1 year.
- Temporary Downtime:
- For downtimes ≤ 4 weeks: Open a water withdrawal point and completely flush the filter and pipes.
- For downtimes > 4 weeks: Perform a backwash (recommended 3 times) and then open a water withdrawal point to completely flush the filter and pipes.
Maintenance Features:
Maintenance and repair activities include cleaning, inspection, and maintenance of the product, and are subject to local and national requirements. The owner/operating company is responsible for ensuring compliance with these tasks.
- Cleaning (8.1):
- Do not use cleaning agents containing alcohol/solvents as they can damage plastic components.
- Use a mild/pH-neutral soap solution.
- Only clean the outside of the product.
- Avoid strong or abrasive cleaning agents.
- Wipe surfaces with a damp cloth.
- Inspection (8.3):
- Carry out an inspection at least every 2 months.
- Check the installation for leaks and proper function.
- For BOXER RDX, read the static pressure (zero flow) and flow pressure (with maximum flow from a withdrawal point).
- Perform a backwash if the filter element shows increasing contamination or if water pressure in the pipe network decreases.
- Semi-annual Maintenance (8.4.1):
- Perform a backwash (recommended 3 times). Filtered pure water remains available during backwash.
- If no drain connection is installed, place a 10-liter bucket under the filter.
- Turn the backwash handwheel counter-clockwise to its stop (without turning the filter cylinder), hold for 5-10 seconds, then turn it clockwise back to its initial position until a clicking sound is heard.
- Set the maintenance ring to the month of the next maintenance (or next backwash, every six months at the latest).
- Annual Maintenance (as needed) (8.4.2):
- If leaks or malfunctions are detected, perform a wear and tear test in addition to semi-annual maintenance.
- Close shut-off valves on inlet and outlet.
- Unscrew the filter cylinder.
- Check O-rings and flat seals for wear and tear.
- Check the tight fit of the filter in the pipe.
- Remove the drain connection (if present).
- Carry out a backwash to relieve water pressure.
- Remove the backwash handwheel.
- Check the spring assembly and non-return valve for free movement and damage.
- Check the filter element for damage and dirt deposits.
- Replace worn components as needed.
- Mount the filter and put the installation back into operation.
- Wearing Parts (8.6): Wearing parts must be replaced by qualified specialists. These include seals (O-rings), the filter element, and the backwash valve.
- Tools Required (for maintenance): Strap wrench (to remove filter cylinder), pipe socket wrench (for pressure reducer cartridge), Allen key 10 (for fastening nut).
- Troubleshooting (9.1): The manual provides a table of observations, explanations, and remedies for common issues such as low water pressure, negatively affected water taste, solids in filtered water, and water loss/leaks. For issues that cannot be resolved, contact technical service.
- Disposal (11.2): Obey national and local regulations for disposal. Packaging materials are recyclable. Product disposal should follow local regulations for electrical and electronic products, utilizing collection points. If the product contains batteries, dispose of them separately.
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