Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions

Also see for ecoTEC plus 937: Operating manual Instructions for installation and servicing Operating manual

Contents

37Installation and maintenance instructions ecoTEC plus 0020031552_03aabcc111Fig. 6.4 Setting range for the storage tank temperatureIf the storage tank charging function is switched off thestorage tank is not held at temperature. In this case theunit switches on when water is drawn off and operateson a through-flow principle.H Danger!Danger of scalding!The units are fitted with automatic Legionellaprotection control:If the temperature falls below 50 °C in the hotwater storage tank the storage tank is heatedup to 70 °C once every 24 hours. In such acase there is a danger of scalding when drawingthe water off.The Legionella protection control can be de-activated inthe diagnosis level "d.74“.Activating the storage tank charging• Switch on the appliance.• Activate the storage tank charging by turning the hotwater temperature control knob fully clockwise.The symbol " “ is displayed.• Turn the hot water temperature control knob to thetemperature you require.• Press "i" to activate the status indicator.During the storage tank charging the display shows "S.24“.Fig. 6.5 Display during storage tank chargingDe-activating the storage tank charging• De-activate the storage tank charging by turning thehot water temperature control knob fully anti-clockwise.The symbol " “ disappears.• Then set the desired hot water temperature. The unitnow operates in the through-flow principle, the stor-age tank is not held at temperature.6.1.5 Subsequent flushing through of the heatingsystem ("hot")• Allow the appliance to run until both the applianceand the heating system have reached their operatingtemperature.• Check the heating system for leaks.• Connect a hose to the drain valve which is located atthe lowest position in the heating system.• Shut off the appliance, open the drain valve and allvent valves on the radiators and allow the water toflow out of the heating system and the combi boilerquickly and fully.• Close the drain valve.• Re-fill the heating system with water as described inSection 5.4.3.• Drain water out of the system until a system pressureof 1.0 bar is reached. (The ideal measured value on thepressure gauge is 0.5 bar plus an extra amount corre-sponding to the highest point of the system above thecombi boiler. A height of 10 m corresponds to a pres-sure increase on the pressure gauge of around 1 bar.The pressure must not be less than 1 bar on any instal-lation.)If the system is to be protected by an inhibitor, itshould be added at this stage in accordance with themanufacturer's instructions.Further information can be obtained from Sentinel,Betz Dearborn Ltd., Tel.: 0151 420 9595, or from Fern-ox, Alpha–Fry technologies, Tel.: 0870 8700362.• Re-fit the enclosure of the combi boiler (see Section5.10).• Fit the base cover to the combi boiler and shift loadstorage tank by pushing the front edge of the coverinto the retaining tag on the front lower edge of theunit framework.• Carefully push the base cover upwards until the springclips on the side of the unit engage. It may be neces-Commissioning, Part II: Functional checks 6