Demineralisation. PUROTAP expert. Installation Function Operation Service. Demineralised heating water.

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1 EN Demineralised heating water Demineralisation PUROTAP expert Installation Function Operation Service Demineralised heating water makes heating systems safe in accordance with VDI 205 and SWKI BT Minerals and salts in water circuits for technical purposes cause corrosion and deposits. PUROTAP expert filters the aggressive substances out of the fill water, thereby enabling trouble-free operation for the long term.

2 EN 2 Protection against limescale deposits Contents Protection against corrosion Function 4 Specification 4 Components 5 Operating the combined meter 6 Operation and safety 7 Troubleshooting 8 Updates may be made without notice. Web version supercedes print version.

3 Protection against limescale deposits in the boiler and heat exchanger EN Demineralised water water no longer contains any substances that can settle out or be deposited in the boiler and heat exchanger. The following table shows the amount of lime accumulating in a heating system that is filled once with untreated water. Total hardness fh fh Amount of lime in 1 m of fill water dh g 200 g 00 g 400 g 500 g Amount of dissolved calcium carbonate (CaCO ) VDI 205, SWKI Directive BT and other European standards state that water for filling heating systems should generally be demineralised for low salt operation. Practical experience has shown that even at a low hardness level, modern appliances such as wall mounted gas boilers, heat pumps and solar thermal systems can suffer damage from limescale deposits. Compared to water that has been softened, demineralised water no longer contains any salts. Its electrical conductivity is extremely low, allowing it to act as a corrosion inhibitor. Protection against corrosion Full desalination additionally removes all neutral salts such as chlorides, sulphates and nitrates, which are known to cause corrosion above a certain concentration and in certain combinations. In line with applicable standards It has long been clear to experts in the field that fully desalinated water is ideal for filling heating systems and that this will extend the service life of all components. Today, this technology is so user friendly and affordable that it recommends itself for practical application. Total hardness dh V corr Overheating, stress crack Limescale deposits in the boiler Speed of corrosion Salt content in the water The process of full desalination (demineralisation) is therefore ideal for ensuring that the water quality requirements of the following directives and standards are met: - VDI Guideline SWKI BT ÖNORM DIN 5090 Pitting due to high salt content

4 EN 4 Function PUROTAP expert operates with hyper filtration a most advanced process. The flow pattern of the water inside the intricately designed tank is controlled in a way that enables the system to achieve incomparably high filtration velocities. The integral high pressure pump allows PUROTAP expert to achieve a throughput of 20 l/min, or 1200 l/hr. Raw water is pushed inside the PUROTAP expert at pressures of up to 18 bar through a filter membrane with a gauge width of less than one nanometre this equates to one millionth of a millimetre. This holds back all dissolved solids and only pure water molecules pass through the membrane. The hyper-filtered water is particularly suitable for technical applications since dissolved minerals, heavy metals and pesticides, as well as bacteria and organic matter, are removed from the water. 5 An optimised and fully automatic flushing process keeps the filter membrane clean whilst in use. All PUROTAP expert components operate without use of power. Technical design innovations mean there is no need to use controllers and regulating valves that are susceptible to failure. On average, the filter diaphragm only needs to be replaced once every litres. Compared to ion exchange, this keeps running costs substantially lower. Hair Limescale, powdery corrosion Bacteria Viruses Pesticides Nitrate, sulphate Pure water Coarse filter Fine filter Particle filter Micro filter Ultrafiltration Nanofiltration Hyperfiltration Specification Mobile unit for fast, ecologically sound and affordable demineralisation of tap water. Integrated metering and control devices; power supply optional. Minimum inlet pipe flow rate: 0 l/min Max. inlet pipe pressure 9 bar Max. operating pressure with pump: 18 bar Desalination capacity without pump: up to 10 l/min Desalination capacity with pump: up to 20 l/min, depending on hardness of raw water and pressure conditions Max. water temperature: 60 C Pump connection: 20V/16A Filter Membrane service life: approx l The throughput (l/min) depends on the salt content of the raw water. The higher the salt content, the lower the throughput. The service life of the filter cartridge depends on the contamination level of the raw water. Turbid materials, rust particles, organic contaminants, etc. shorten the service life of the filter membrane. Main applications: - District heating systems - Large plants and major heating or cooling systems with a top-up demand > 1000 l p.a. - Water for cleaning purposes (windows, solar panels, cars, etc.) Not suitable for desalinating any other water sources except tap water from the drinking water supply.

5 Components 5 EN Filter casing cover Stainless steel filter casing, maximum operating pressure 18 bar Pressure booster pump 20 V/16 A/8 bar Pressure gauge dynamic pressure, filter membrane Aeration tap for draining and replacing the membrane Manometer for pure water output Handle Combined meter Waste water output, connection /4" external thread (concentrate) Handle Pure, fully desalinated water output, connection /4" external thread (permeate) Mechanical single lever fitting assembly for fully automatic operation Tap water input, connection /4" external thread at back of pump Height: Width: Depth: Weight: 1 cm 64 cm 60 cm 100 kg

6 EN 6 Operating the combined meter The combined meter is battery-operated. It measures the flow rate in l/min, the total volume in litres and the concentration of dissolved minerals (electrical conductivity), either in microsiemens or TDS. In addition, a limit can be set for the maximum concentration of minerals tolerated in the demineralised water (expert outlet). The limit and flow rate total can both be reset. Display: Limit Automatic quality monitor Flow rate Limit warning signal Total litres treated Recommended limit: TDS/50 µs; above this the membrane will need to be replaced µs Keys: 1 2 Warning limit TDS/µS toggle setting ON/OFF 4 Combined meter reset 1 2 Every time this key is pressed, the limit is increased by 6/7 TDS or 10 µs/cm. Pressing the key for seconds resets the limit to zero. Programming the limit ensures that a warning is issued when the ion exchange resin is spent. This key can be pressed at any time to switch between TDS (total dissolved solids) and electrical conductivity. Both are units of measurement for minerals dissolved in water. Most European component manufacturers use the unit of measurement µs/cm (microsiemens). If the ON key is pressed once, the water quality is measured for 10 seconds and compared to the set limit. The measured value is shown. If it is above the limit, the LED glows red; if it is below, the LED glows green while the measurement is being taken. If required, the measurement can be repeated manually. Auto mode: If the ON key is pressed for a second time, the combined meter begins automatic monitoring. The eye symbol appears to indicate that monitoring has been enabled. In auto mode, the meter only takes measurements when water is actually passing over it. If the water draw-off is interrupted, the meter continues to show the last captured value. While water is being drawn off, the combined meter measures the water quality every 40 litres. If the limit is exceeded in two successive measurements, the display continuously flashes red. This indicates that the ion exchange resin is spent and needs replacing. If the ON key is pressed for a third time, the meter exits auto mode. 4 Pressing the reset key for seconds resets the overall total on the combined meter. This is recommended every time the filter membrane is replaced since it gives a reference point for the remaining capacity of the filter membrane. When the combined meter displays the symbol indicating a battery change is due: Carefully unscrew the front and replace the batteries. x AAA. x AAA

7 Operation and safety 11 7 EN Operation Turn the single lever fitting (1) in the direction of flow = close; close the aeration tap (2). Attach the freshwater connection () behind the pump, at an inflow rate of at least 0 l/min; connection /4" external thread. Open the tap (4) to subject the inlet hose to pressure. Using the hose, route the concentrate output (5) into the drain. Open the single lever fitting (1), open the aeration tap (2) and wait until the casing has been ventilated. Close the aeration valve. Monitor the pure water output (6). If the combined meter (7) indicates a conductivity of below 0 µs (microsiemens) per centimetre, PUROTAP expert is ready for operation and can be connected. If necessary, attach the plug on the pump (8) to boost the rate. Cable length: 2,8 m Monitor the combined meter. End of operation Close single lever fitting (1), disconnect all hoses, open aeration tap (2) and single lever fitting (1) and drain casing. Protective measures: It is essential to use a pressure-reducing valve when filling sealed unvented systems. PUROTAP expert can build up to 18 bar pressure. Monitor casing pressure: it should not exceed 18 bar. Water not suitable for drinking. Connect PUROTAP expert to clean drinking water supply only; contaminants in the water destroy the filter membrane. Only to be operated by qualified personnel and under supervision.

8 EN 8 Troubleshooting Little or no pure water Possible causes: - Single lever fitting not opened - Water supply rate too low; minimum = 0 l/min - Filter membrane spent No/incorrect display on combined meter Possible causes: - Battery needs replacing - Meter jammed - Meter faulty - Conductivity too high Possible causes: - Insufficient flushing (can take a few minutes) - Filter membrane faulty Replacing the filter membrane - Remove all water connections from PUROTAP expert - Pull out pump plug - Open single lever fitting (1) (pointing forwards) - Open aeration tap (2) - Open cover () - Remove fine filter (4) - Take out filter membrane (5) - Unpack new membrane; grease connector with silicone grease - Insert new filter membrane with the connector pointing downwards - Insert fine filter (4) - Close cover - Test run - Lubricate the O-ring on the membrane with the silicone grease supplied (6)