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Operating instructions | 4
9026381C Dual Top ST 6 _ 8 - OI 7 / 19
Ad 6 The power indicator lights up green when the
Dual Top ST is switched on and START (3) is pressed.
Also “Heater ON” on display (7). The heater is
operating or in the standby mode.
Power indicator is off when STOP (3) is pressed or
when Dual Top ST is switched off. Also “Heater OFF”
on display (7). The heater is not operating or is not in
the standby mode.
The indicator flashing pulses red if a fault has oc-
curred.
Ad 7 The heater is ON when the Dual Top ST is switched on
and START (3) is pressed. The heater is operating or
in the standby mode.
The heater is OFF when STOP (3) is pressed or the
Dual Top ST is switched off. The heater is not operat-
ing or is not in the standby mode.
Ad 8 The remote symbol is shown when the device is
ready to accept signals from the remote control.
Ad 9 The drainage symbol is shown when the electrical
safety/drainage valve is opened.
Ad 10 Dual Top ST 8:
The 230 V symbol is shown when the external
230 V power supply is connected.
The 230 V symbol is shown if it is not connected.
Dual Top ST 6:
The desired interior temperature is shown, not the ac-
tual temperature.
Ad 11 The desired interior temperature is shown, not the ac-
tual temperature.
Ad 13 Dual Top ST 8:
The desired water temperature is shown, not the ac-
tual temperature.
CAUTION
The absence of the " 230 V" symbol does not guar-
antee that no 230 V supply is present!
Background lighting
The background lighting in the display comes on when you
switch the Dual Top ST equipment on. It does not matter if the
heater is in operation or not. The background lighting fades out
after a few minutes if you do not press any buttons.
The backlight comes back on if you press or .
NOTE
The display may become darker when the control panel
temperature becomes very high or when the control
panel is placed in direct sunlight. Avoid exposing the
control panel to high temperatures or direct sunlight.
Where these conditions cannot be avoided, adjust the
display contrast in “ Setup” (see chapter4.4.2, "Lan-
guage, temperature unit, hour format, display contrast"
on page 11 ).
4.2 Manual control panel Dual Top ST
6
4.2.1 Summer mode (hot water only)
1. Make sure that the boiler is filled with fresh drinking water.
2. Set selector knob (A) to summer mode, water temperature
40 °C (1) or 70 °C (2) on the control panel.
The indicator (C) on the control panel lights up green when the
equipment is switched on. The red indicator on the mode se-
lector knob (A) illuminates.
When the selected water temperature is reached (40 °C or 70
°C) combustion inside the heater stops.
As soon as the water temperature drops below a certain value,
combustion is started again.
The indicator (C) on the control panel lights up green as long as
the equipmend is switched on.
4.2.2 Winter mode (heating without hot water
production)
1. Set the interior temperature selector (B) on the control
panel to the desired thermostat setting for interior temper-
ature.
2. Set the mode selector knob (A) on the control panel to
winter mode, heating without hot water production (3).
The indicator (C) on the control panel lights up green when the
equipment is switched on.
The red indicator on the mode selector knob (A) and on the in-
terior temperature selector (B) both illuminate.
When the selected interior temperature is approached, the
heater starts to modulate.
The power is adjusted to a level necessary to maintain a con-
stant temperature.
In case the interior temperature exceeds the selected temperat-
ure, due to environmental influences, the combustion inside the
heater stops.
NOTE
Please note that, if the boiler has been filled, the water
is automatically heated as well. The water temperature
may reach up to 80 °C depending on the power and
the duration of the heating.
4.2.3 Winter mode (heating with hot water
production)
1. Make sure that the boiler is filled with fresh drinking water.
2. Set the interior temperature selector (B) on the control
panel to the desired thermostat setting for room temperat-
ure.
3. Set the mode selector knob (A) on the control panel to
winter mode, heating with hot water production (4).
The indicator (C) on the control panel lights up green when the
equipment is switched on.
The red indicator on the mode selector knob (A) and on the in-
terior temperature selector (B) both illuminate.
The heater gradually reduces the power until the selected in-
terior temperature is reached. If the interior temperature has
been reached, but the water temperature is still too low, the
blown air circulation fan switches off and the water continues
to be heated to a temperature of 70 °C.
The water temperature may reach up to 80 °C depending on
the heating power that is required to achieve the interior tem-
perature.
NO WATER control
When winter mode (heating with hot water production) is se-
lected, but the boiler has no water, there will be a warning on
the control panel.
The green LED with the winter mode icon, heating without hot
water production (3), will flash.
7


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