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1
2
5.4
To commission the unit
Legend - User interface:
a
d
a
Left dial
b
LCD screen
c
Right dial
d
Mode / Reset
e
Status indicator
f
Cancel / Back
g
Menu / Enter
1 Make sure the system is filled with water and fully vented as
described in this manual.
2 Check that the central heating and domestic hot water isolating
valves are open.
3 Check that gas service valve is open.
4 Connect the unit to the main power supply. The user interface
will be energized.
5.4.1
To commission the central heating
1 Set mode to winter mode via "Mode" button on the user
interface. ( and
icons are displayed on the screen.)
2 Set central heating set temperature to maximum value via left
dial. If connected, make sure all external controls such as
outdoor sensor and room thermostat are calling for heat.
3 The boiler control now go through its ignition sequence. The
status indicator will glow constantly in blue if flame is
established.
icon will blink when central heating is active.
D2CND028+035A1/4AB + D2TND028+035A4AB
Wall-mounted condensing boiler
3P469346-5N – 2019.11
3
b
c
e
f
g
INFORMATION
After first power ON, the boiler does not increase its
capacity above a preset value for about 12 minutes, even if
there is demand.
▪ First 0~2 minutes: The electronic gas adaptive system
calibrates itself.
▪ Next 8~10 minutes: The boiler performs the low water
temperature function. You can skip this function by
pressing the "Cancel" button for 5 seconds.
5.4.2
To measure the flue emissions
NOTICE
Make sure all the radiator valves are opened and water
circulation is allowed.
1 Change operation mode to the stand-by.
2 Before activating the sweeper mode, gas analyzer device
should be mounted to its place on the flue.
3 To activate the sweeper mode, press "Cancel" and "Menu"
buttons together 5 seconds. With sweeper mode, boiler can be
operated at maximum and minimum capacity independent of
heat demand.
4 When the sweeper mode is activated, "tst - 100" caption will
appear on the screen. This means boiler is operating at nominal
capacity. Check the CO
values at nominal capacity.
2
5 To switch between nominal and minimum capacities, press
"Mode" button. "tst - xx" caption will appear on screen. This
means boiler is operating at minimum capacity. Check the CO
values at minimum capacity.
6 To quit sweeper mode, again press "Cancel" and "Menu"
buttons together 5 seconds. Sweeper mode will be deactivated
and boiler will return to normal operation mode. Sweeper mode
also finishes automatically after 15 minutes.
INFORMATION
"xx" is referring to minimum percental capacity and this
value can be different according to model.
The CO
values should be in limits as shown in below table.
2
CO
emissions
2
CO
Emission at nominal and
2
minimum heat input (G20)
CO
Emission at nominal and
2
minimum heat input (G31)
Gas inlet pressure
G20 (min. / max.)
G31 (min. / max.)
5.4.3
To commission the central heating
capacity setting
The boiler's central heating capacity can be adjusted form the
control panel. If the heat loss of installation is much less than that of
the boiler nominal capacity, it is recommended to reduce the boiler
nominal capacity to the installation capacity. Refer to service
instructions for this operation.
5.4.4
To commission the domestic hot water
(Only for models D2CND028 and D2CND035 )
1 Set domestic hot water set temperature to its maximum value
via right dial.
2 Open hot water taps fully and ensure that water flows freely
from them.
5 Commissioning
2
Unit
Value
%
9.0 ± 0.8
%
11.3 ± 1.0
Unit
Value
mbar
17 / 30
mbar
25 / 45
Installation manual
27
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