Vaillant aroTHERM VWL ../2 A 230 V series Installation Instructions Manual

6 Start-up22 Installation instructions aroTHERM 0020147164_07▶ To purge the heating circuit, open the heating circuit'spurging valve (1) by a 1/4 rotation (B) using an open-endspanner.▶ Increase the operating pressure in the heat pump heat-ing circuit.– Operating pressure: 0.15 … 0.2 MPa (1.50… 2.0 bar)NoteThe pressure level may fall in the first monthfollowing start-up. It may also vary dependingon the outside temperature.1 356421 Drain hose2 Heating flow3 Stop valve4 Water/glycol supply5 Heating return6 Collecting container▶ Close the stop cock in the heating flow.▶ Fill the heating circuit via the heating return.◁ Air collects at the purging valve.Conditions: If you are using glycol▶ The glycol must not escape into the outflow or the envir-onment.▶ Prepare a mixture with suitable glycol (max. 50% ethyl-ene glycol) in order to protect the heat pump againstfrost according to the regional minimum temperatures.NoteIf no frost protection has been poured in, theproduct will not be protected in the event of apower cut when there is frost.▶ Use a frost protection tester to ensure the correctdosage.6.7 Checking and treating the heatingwater/filling and supplementary waterCaution.Risk of material damage due to poor-qual-ity heating water▶ Ensure that the heating water is of suffi-cient quality.▶ Before filling or topping up the system, check the qualityof the heating water.Checking the quality of the heating water▶ Remove a little water from the heating circuit.▶ Check the appearance of the heating water.▶ If you ascertain that it contains sedimentary materials,you must desludge the system.▶ Use a magnetic rod to check whether it contains mag-netite (iron oxide).▶ If you ascertain that it contains magnetite, clean the sys-tem and apply suitable corrosion-protection measures, orfit a magnet filter.▶ Check the pH value of the removed water at 25 °C.▶ If the value is below 8.2 or above 10.0, clean the systemand treat the heating water.▶ Ensure that oxygen cannot get into the heating water.Checking the filling and supplementary water▶ Before filling the system, measure the hardness of thefilling and supplementary water.Treating the filling and supplementary water▶ Observe all applicable national regulations and technicalstandards when treating the filling and supplementarywater.Provided the national regulations and technical standardsdo not stipulate more stringent requirements, the followingapplies:You must treat the heating water in the following cases:– If the entire filling and supplementary water quantity dur-ing the operating life of the system exceeds three timesthe nominal volume of the heating installation, or– If the guideline values listed in the following table are notmet, or– If the pH value of the heating water is less than 8.2 ormore than 10.0.TotalheatingoutputWater hardness at specific system volume1)≤ 20 l/kW > 20 l/kW≤ 50 l/kW > 50 l/kWkW ppmCaCO₃mol/m³ppmCaCO₃mol/m³ppmCaCO₃mol/m³< 50 < 300 < 3 200 2 2 0.02> 50to ≤ 200200 2 150 1.5 2 0.02> 200to ≤ 600150 1.5 2 0.02 2 0.02> 600 2 0.02 2 0.02 2 0.021) Nominal capacity in litres/heating output; in the case of multi-boiler systems, the smallest single heating output is to be used.