11Operating instructions ecoTEC plus 937
If the storage tank charging function is switched off, the
tank is not held at temperature. The unit only switches
on in this case if the water is drawn off and only
operates in the through-flow mode.
H
Danger!
Danger of scalding!
The units are equipped with an automatic
Legionella protection switching system:
If the temperature in the hot water tank falls
below 50 °C, the tank is heated up to 70 °C
once every 24 hours. In this case there is a
danger of scalding when drawing the water off.
The Legionella protection system can be de-activated in
the diagnosis level. For further information see installati-
on and maintenance manual, Section 6.1.4, Storage tank
charging 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 to
the temperature you require.
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1
Fig. 4.9 Display during storage tank charging
• Activate the storage tank charging by turning the knob
for adjusting the hot water draw-off temperature all
the way to the right-hand end stop.
The "
" symbol is displayed.
• Turn the knob for setting the hot water temperature to
the temperature you require.
De-activating the storage tank charging
• De-activate the storage tank charging by turning the
knob for adjusting the hot water draw-off temperature
all the way to the left-hand end stop.
The "
" symbol disappears.
• Then set the desired draw-off temperature. The unit
then operates in the through-flow mode, the storage
tank is not held at temperature.
4.4.4 Drawing off the hot water
1
Fig. 4.10 Drawing off the hot water
When one of the hot water taps (1) at a draw-off point
(wash-basin, shower, bath etc.) is opened, the unit
automatically starts up and provides hot water.
When the hot water tap is switched off the unit switches
off (or, if required, continues to operate for the heating
system or to recharge the storage tank).
4.5 Heating operation
The boiler can only be used if the heating system has
water in it (see Section 4.2.2).
4.5.1 Setting the flow temperature
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1
2
Fig. 4.11 Setting the flow temperature
Set 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 weather
Operation 4
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