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7
Maintenance
7.1
Notes on safety for the maintenance
The periodic maintenance is essential for the good operation,
safety, yield and duration of the burner.
It allows you to reduce consumption and polluting emissions and
to keep the product in a reliable state over time.
The maintenance interventions and the calibration
of the burner must only be carried out by qualified,
authorised personnel, in accordance with the con-
tents of this manual and in compliance with the
DANGER
standards and regulations of current laws.
Before carrying out any maintenance, cleaning or checking oper-
ations:
disconnect the electricity supply from the burner
by means of the main switch of the system;
DANGER
Close the fuel interception tap.
DANGER
7.2
Maintenance programme
7.2.1
Maintenance frequency
The combustion system should be checked at least once a year
by a representative of the manufacturer or another specialised
technician.
7.2.2
Checking and cleaning
Flexible hoses
Check there are no occlusions or obstructions in the fuel supply
pipes, in the air suction areas and in the combustion product
waste pipe.
Electrical wiring
Check that the burner and gas train electrical connections are
correct.
Gas leaks
Make sure there are no gas leaks in the following areas:
–
on the meter-burner pipework
–
on the mixer/valve connection
–
on the burner fastening flange where gaskets are fitted.
Combustion head
Inspect the combustion head and make sure the fabric is undam-
aged and does not feature large or deep holes or corroded areas.
Also make sure that no parts have warped as a result of the high
temperature.
Electrodes assembly
Make sure neither the electrodes nor probe show marked warp-
ing or oxidation on surfaces.
Make sure distances are still in line with those indicated in Fig. 10,
readjusting to the right values where necessary. Where neces-
20028767
Maintenance
sary, remove oxide from the surface of the probe with abrasive
paper.
Gas train
Check valve setting and proportionality of operation by analysing
flue gases.
Check the valve/manifold compensation pipe.
Combustion
Let the burner run at full capacity for about ten minutes, setting all
the elements correctly as explained in this manual.
Then carry out the analysis of the combustion by checking:
•
CO2 percentage (%);
•
CO content (ppm);
•
NOx content (ppm);
•
Ionisation current (µA);
•
Flue gas temperature at the flue.
Adjust the burner if the combustion values found at the beginning
of the operation do not comply with the regulations in force or, at
any rate, do not produce good combustion.
Use the appropriate card to record the new combustion values;
they will be useful for subsequent controls.
20
GB
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