Operating instructions

Operation
Operating instructions ecoTEC plus 0020116701_00 17
5
a
Danger!
Risk of scalding.
VUI 937 only: The boilers are equipped with
an automatic Legionella protection func-
tion:
If the temperature in the hot water domes-
tic hot water cylinder falls below 50°C, the
cylinder is heated up to 70 °C once every
24 hours.
> If this is the case, try not to draw off any
water.
Your approved competent person can switch off the
Legionella protection function. Ask your approved compe-
tent person for details about this.
Switching cylinder charging on and off
Comfort operation
Comfort on
Back
5.8 Switching cylinder charging (Comfort mode) on and off
> Press the left-hand selection button (" ").
> Press the right-hand selection button
("
").
"Comfort mode on" or "Comfort mode off" flashes in the
display.
> Use the minus button
or the plus button
to activate or deactivate Comfort mode.
> Confirm the change by pressing the right-hand selection
button
("OK").
When you have activated Comfort mode, the symbol "
" is
shown in the basic display.
When you have deactivated Comfort mode, the symbol "
"
goes out in the basic display. The boiler now operates in the
through-flow principle; the cylinder is not held at tempera-
ture.
> Set the cylinder temperature using the hot water tem-
perature setting (¬Section 5.3.1).
5.4 Hot water production with VU boilers
a
Danger!
Risk of being scalded by hot water.
There is a danger of scalding at the hot
water draw-off points if the temperatures
are greater than 60°C. Young children and
elderly persons are particularly at risk,
even at lower temperatures.
> Select the temperature so that nobody is
at risk.
a
Danger!
Possible danger to life from legionella!
In domestic hot water cylinders there is a
risk of legionella forming, which can causes
illness.
> If the boiler is used for post-heating
within a solar-supported drinking water
heating system, set the hot water tem-
perature to at least 60°C.
b
Caution!
Risk of damage caused by calcification.
If the water hardness is greater than
3.57 mol/m
3
(= 357 mg/l CaCO
3
), there is a
risk of calcification.
> Set the water temperature to a maximum
of 50°C.
To produce hot water in conjunction with the VU unit type,
a VIH-type domestic hot water cylinder must be connected
to the boiler.
45
DHW temperature
Back
5.9 Setting the hot water temperature
> Press the left-hand selection button (" ").
The hot water temperature that is set is shown flashing on
the display.
> Use the minus button
or the plus button
to change the hot water temperature.
> Confirm the change by pressing the right-hand selection
button
("OK").
If you have connected an eBUS auto controller to the boiler,
you can set the hot water target temperature on the con-
troller.