3 Operation
Operation manual
7
D035A1/4AB + D035A4AB
Wall-mounted condensing boiler
3P469438-5M – 2019.11
NOTICE
In case of bad or inappropriate central heating circuit
design, which causes inadequate heat emission to the
living space, activating the ECO mode may cause capacity
shortage.
3.3.7
About the domestic hot water operation
This unit supplies domestic hot water by way of a plate heat
exchanger (instantaneous) or by way of a hot water storage tank
according to model of the boiler.
If the boiler is instantaneous type, domestic hot water operation is
activated when water is being tapped. Water flow rate must be at
least 2.5 l/min.
If it is storage tank type, domestic hot water operation is activated
according to storage tank temperature value.
The icon blinks when domestic hot water operation is active.
INFORMATION
Domestic hot water operation mode must be enabled for
the boiler to be able to produce domestic hot water. (i.e.
summer mode or winter mode).
DANGER
For storage tank type models, domestic water temperature
may increase to 70°C due to a protective function. Possible
measures are explained in installation manual.
3.3.8
About the domestic hot water comfort
mode
The domestic hot water comfort mode includes a domestic hot water
pre-heat function and a domestic hot water post-heat function. When
the comfort mode is enabled, both pre-heat and post-heat functions
are enabled.
The pre-heat function is a self-learning algorithm according to which
the boiler will heat up the domestic hot water, before the tapping
demand. The algorithm is based on your personal use pattern of the
last 24 hours.
Note:
Independent of personal use pattern, comfort mode
preheating function could be adjusted to operate continuously from
the user settings.
The post-heat function heats up the domestic hot water heat
exchanger after tapping, when the flow temperature of the boiler is
below the domestic hot water temperature setpoint.
Comfort mode can be enabled from the user settings menu (see
"User settings menu: Parameters (short)"
INFORMATION
Domestic hot water comfort mode is only valid for
instantaneous type hot water supply types.
When the domestic hot water comfort mode is enabled, the icon is
shown on the screen.
The icon blinks when the burner is on for comfort mode.
3.3.9
About the boiler frost protection
Frost protection safety system:
This function protects the unit and
heating installation from frost damages. This protection activates the
boiler pump when the water temperature drops below 13°C and it
activates the burner when the water temperature drops below 8°C
(factory setting). The unit keeps running until the temperature
reaches 20°C. To enable this function, the unit must be connected to
the power supply and its main gas valve must be open. Any damage
caused by frost is not covered by the warranty. Frost Protection is
enabled in all modes, including standby mode and full-off mode.
While frost protection is active, “Fr” and actual flow temperature are
displayed subsequently on the display.
WARNING
If the boiler is not connected to the power supply, frost
protection is not active. Consequently, the water may
freeze and cause cracks. The manufacturer is not
responsible for any damage that may occur this way.
NOTICE
When not using the boiler, we strongly recommend not to
cut off the electric supply to the boiler.
3.3.10
About Energy Metering Function
INFORMATION
To be able to use energy metering function, the units has
to be equipped with the LAN adapter and the function
should be activated by qualified persons.
This function provides user to read electricity and gas consumptions
for central heating and domestic hot water operations, in monthly
and yearly basis. In case the unit is not connected to internet, UH-08
error is displayed after power on. To remove this error and activate
this function, actual date must be set from T parameters.
For detailed instructions to set actual date, see
For detailed information to display consumption values, see
3.4
Error handling
When an error occurs, the normal behaviour of the user interface is
interrupted, and the status of the status indicator is affected.
However, be aware that not all errors have the same effect on the
user interface and the status indicator.
Error
type
Boiler operation
User interface and status
indicator
Warning Continue
The status indicator does not enter
error mode if the burner is on. It
turns to red when the burner is off.
The LCD screen stays active and
displays the error code.
Blocking Blocked, turns back
to operation if
cause disappears
The status indicator enters error
mode. The LCD screen stays active
and displays the error code.
Lockout
Blocked and a
reset is required
The status indicator enters error
mode. The LCD screen stays active
and displays the error code. Also,
the icon starts blinking, indicating
that a reset is required
.
In case of a warning or a blocking error, the user interface will leave
error mode and return to the home screen when the cause of the
error disappears.
In case of a lockout error, the boiler needs to be reset. Press the
"Reset" button to remove the error, if the cause of the error is gone.
If the cause of the error is still there, the user interface will enter
error mode again. When the error is solved, the user interface
returns to the home screen.
If you turn any dial or press any button (except the "Reset" button)
during an error, the user interface will display the home screen. After
the timeout without any interaction, instead of darkening, the user
interface will enter error mode.
