D2CND0 D2CND0 D2TND0
D2TND0 D2TND024A4AA
Wall-mounted condensing boiler
ESIE17-09 / 2017.11
Servicing manual
25
1
2
3
6.2
Gas-air ratio: No need to adjust
The installer does not have to adjust the gas-air ratio, because
the boiler has an electronic gas adaptive feature.
6.3
To check for gas leakage
1.
Before connecting the unit to power mains, close valves
1, 2 and 3.
2.
Connect a manometer to gas counter.
3.
Open valves 1, 2 and 3.
4.
Close valve 1.
5.
Note the manometer measurement and wait for 10 mi
-
nutes.
6.
After 10 minutes, compare the manometer measurement
with the initial value. If the pressure is decreased, it me
-
ans there is gas leakage. Check the gas line and fittings.
7.
Repeat this process until being sure that there is no le
-
akage.
8.
Close valve 1, remove the manometer and open valve 1
again.
Before passing next steps, this control must be
fulfilled.
DANGER
6.4
To commission the unit
6.4.1
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.
4.
Press “Cancel” and “Menu” buttons together 5 seconds
to activate the sweeper mode. With sweeper mode, boi
-
ler can be operated at maximum and minimum capacity
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 adapti
-
ve 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.
INFORMATION
6.4.2
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 re
-
duce the boiler nominal capacity to the installation capacity.
Refer to service instructions for this operation.
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 in
-
terface will be energised.
6.4.3
To commission the domestic hot water
(Only for model D2CND024)
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 fre
-
ely from them.
3.
icon will blink when domestic water heating is active.
4.
Measure the domestic hot water inlet temperature. (Cold
water drawn off from taps).
5.
Check that domestic hot water temperature rise is around
34°C.
6 Commissioning
independent of heat demand.
5.
“tst - 100” caption will appear on the screen. This means
boiler is operating at nominal capacity. Check nominal ca
-
pacity operation.
6.
To quit sweeper mode, again press “Cancel” and “Menu”
buttons together five seconds. Sweeper mode will be de
-
activated and boiler will return to normal operation mode.
