Vaillant ecoTEC plus 937 Operating Manual

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

Contents

Vaillant ecoTEC plus 937 Operating Manual Manual pdf 11 page image

11Operating instructions ecoTEC plus 937If the storage tank charging function is switched off, thetank is not held at temperature. The unit only switcheson in this case if the water is drawn off and onlyoperates in the through-flow mode.H Danger!Danger of scalding!The units are equipped with an automaticLegionella protection switching system:If the temperature in the hot water tank fallsbelow 50 °C, the tank is heated up to 70 °Conce every 24 hours. In this case there is adanger of scalding when drawing the water off.The Legionella protection system can be de-activated inthe diagnosis level. For further information see installati-on and maintenance manual, Section 6.1.4, Storage tankcharging and Section 8.1.2, Diagnostic codes.Activating the storage tank charging system• Switch on the appliance.• Turn the knob for setting the hot water temperature tothe temperature you require.bari F P21Fig. 4.9 Display during storage tank charging• Activate the storage tank charging by turning the knobfor adjusting the hot water draw-off temperature allthe way to the right-hand end stop.The " " symbol is displayed.• Turn the knob for setting the hot water temperature tothe temperature you require.De-activating the storage tank charging• De-activate the storage tank charging by turning theknob for adjusting the hot water draw-off temperatureall the way to the left-hand end stop.The " " symbol disappears.• Then set the desired draw-off temperature. The unitthen operates in the through-flow mode, the storagetank is not held at temperature.4.4.4 Drawing off the hot water1Fig. 4.10 Drawing off the hot waterWhen one of the hot water taps (1) at a draw-off point(wash-basin, shower, bath etc.) is opened, the unitautomatically starts up and provides hot water.When the hot water tap is switched off the unit switchesoff (or, if required, continues to operate for the heatingsystem or to recharge the storage tank).4.5 Heating operationThe boiler can only be used if the heating system haswater in it (see Section 4.2.2).4.5.1 Setting the flow temperaturebari F P12Fig. 4.11 Setting the flow temperatureSet the flow temperature by using the knob (1).We recommend the following settings:– Left-hand setting in Spring and Autumn,– Mid-position setting in reasonably cold weather– Right-hand setting in very cold weatherOperation 4