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9.2
Opening the boiler
Fig.79
Removing the panel
2
9.3
Standard inspection and maintenance operations
9.3.1
Preparation
7837114 - v.01 - 10012023
1
AD-3002452-01
1. Unlock the over centre latches on both sides of the boiler.
2. Remove the panel.
For a service, always perform the following standard inspection and
maintenance operations.
See
The boiler service manual for the specific maintenance work.
Carry out the following steps before commencing inspection and
maintenance activities:
1. Set the boiler to full load until the return temperature is around 65 °C,
to dry the heat exchanger on the flue gas side.
2. Check the water pressure.
The minimum water pressure is 0.8 bar. The recommended water
pressure is between 1.5 bar and 2.0 bar.
2.1. If necessary, top up the central heating system.
3. Check the ionisation current at full load and at low load.
The value is stable after 1 minute.
3.1. If the value is lower than 4 µA, clean or replace the ionisation
and ignition electrode.
4. Check the condition and tightness of the flue gas outlet and air supply
system.
5. Check the combustion by measuring the O
flue gasses.
Important
This appliance is suitable for category I
Hydrogen gas (H
O
/CO
percentage can vary over time. (For example: a
2
2
percentage of 20% H
1,5% of O2 in the flue gasses)
A significant adjustment of the gas valve may be needed.
Adjustment can be done using the standard O
the gas used.
See also
Checking and setting the gas/air ratio, page 40
/CO
2
2
containing up to 20%
2H
). Due to variations in the H
2
in the gas can lead to an increase of
2
9 Maintenance
percentage in the
percentage, the
2
/CO
values of
2
2
53
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