Special Functions; Initial Ignition; System Gas Extraction Function; Chimney Sweeper - De Dietrich MPX 24 COMPACT Notice D'emploi Et D'installation

11.2.2 EXTERNAL STORAGE BOILER
The boiler can be electrically connected to an external storage boiler. A diagram of the hydraulic connection of the external
storage boiler is shown in annex "SECTION" F. Connect the DHW priority sensor NTC to terminals 9-10 on terminal block M2.
The sensitive element of the NTC sensor must be inserted in the special well located on the storage boiler. Make sure that the
exchange capacity of the storage boiler coil is appropriate for the power of the boiler. Adjust DHW temperature (+35°C...+60°C)
by pressing .
IMPORTANT: set parameter P03 = 05 as described in section 14.

12. SPECIAL FUNCTIONS

12.1 INITIAL IGNITION

When lighting the boiler for the first time perform the following procedure. After electrically powering the boiler the code "000"
appears on the display. This means the appliance is ready for the "initial lighting" procedure.
• Press together and hold down for 6 seconds. "On" appears on the display for 2 seconds followed by code "312"
indicating that the "system venting" function is active. This function lasts 10 minutes.
• Afterwards, the boiler switches on, the display shows the code "000" alternating with the % of ignition power and the temperature
value (°C). During this "gas recognition function" phase, that lasts approximately 7 minutes, the type of gas used is analysed.
During this function, assure maximum heat exchange to the heating or DHW system (domestic hot water demand) in order to
prevent the boiler from switching off due to overheating.
• If the boiler runs on natural gas, the display shows NG for approximately 10 seconds. The boiler is now ready for normal
operation. If the display shows LPG, press
the factory setting.
• If the boiler runs on propane the display shows LPG. Press
the display shows NG and does not recognise the type of gas used, press
seconds to exit the function and then change parameter P02=01 as described in the "PARAMETER SETTINGS" section of the
boiler instructions manual.
If the venting or gas recognition function is interrupted by a power blackout, start the function again when power is restored
by pressing and
in hydraulic circuit) during the venting function, open the filling tap on the appliance and restore the correct pressure. If the
gas recognition function is interrupted due to a fault (e.g.: E133 no gas) press
6 seconds) to restart the function again. If the gas recognition function is interrupted due to overheating, restart the function by
pressing and and holding them down for at least 6 seconds.
The combustion of this appliance has been factory controlled, calibrated and set for operation with NATURAL GAS.
During the Gas Type Control Function, the combustion ratio will increase for a short period of time while the gas type is being
established.
During initial ignition, the burner may not ignite (causing the boiler to shut down) until any air in the gas pipes is vented.
In this case, repeat the ignition procedure until gas reaches the burner. To reset boiler operation, press
seconds.
For the first few ignitions immediately after installation the system must implement a self-learning procedure to reach the
correct ignition level.

12.2 SYSTEM GAS EXTRACTION FUNCTION

This function is used to facilitate the elimination of the air inside the heating circuit when the boiler is first installed or after
maintenance when the water is drained from the primary circuit.
To enable the system gas extraction function press buttons
appears on the display for a few seconds, followed by programme row 312.
The electronic board will activate a pump on/off cycle lasting 10 minutes. The function will automatically stop at the end of the
cycle. To manually exit this function, press the above buttons together for 6 seconds once again.

12.3 CHIMNEY SWEEPER

This function enables the boiler to generate maximum heating power. After activation, the boiler power % can be adjusted from
minimum to maximum in the DHW mode. The following procedure is used.
• Press buttons and
seconds followed by programme row "303" alternated with the % of boiler power.
• Press to gradually adjust power (sensitivity 1%).
• To exit press both buttons together for at least 6 seconds, as described in point one.
Press to display the instantaneous flow temperature for 15 seconds.
7679433.01 (1-04/17)
and
together and holding them down for at least 6 seconds. If the display shows fault E118 (low pressure
together for at least 6 seconds. When the function is enabled, the displays shows "On" for a few
together and hold down for at least 4 seconds to exit without changing
for at least 6 seconds to confirm the gas effectively used. If
and
to reset and then press
together for 6 seconds. When the function is active, On
12
together and hold down for at least 4
and (for at least
for at least 2