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6
Maintenance
6.1
Notes on safety for the maintenance
The periodic maintenance is essential for the good operation, safe-
ty, 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-
DANGER
tents of this manual and in compliance with the
standards and regulations of current laws.
Before carrying out any maintenance, cleaning or checking opera-
tions:
6.2
Maintenance programme
6.2.1
Maintenance frequency
The gas combustion system should be checked at
least once a year by a representative of the man-
ufacturer or another specialised technician.
6.2.2
Checking and cleaning
The operator must use the required equipment
during maintenance.
Combustion
Carry out an analysis of the combustion discharge gases.
Significant differences with respect to the previous check indicate
the points where more care should be exercised during mainte-
nance.
Combustion head
Open the burner and make sure that all components of the com-
bustion head are in good condition, not deformed by the high
temperatures, free of impurities from the surroundings and cor-
rectly positioned.
Fan
Check to make sure that no dust has accumulated inside the fan or
on its blades, as this condition will cause a reduction in the air flow
rate and provoke polluting combustion.
Burner
Clean the outside of the burner.
Maintenance
Disconnect the electrical supply from the burner by
means of the main system switch.
DANGER
Close the fuel interception tap.
DANGER
Wait for the components in contact with heat sourc-
es to cool down completely.
Measurement of detector current
Measurement of the detector's signal (Fig. 27) with a Voltmeter is
not normally required since the flame signal's intensity is shown on
the AZL...display and operating unit.
Min. value for a good work: 3.5 Vdc (AZL dosplay flame approx.
50%).
If the value is lower, it can depend on:
–
photocell positioned incorrectly;
–
low corrent (lower than 96V);
–
bad regulation of the burner.
To measure power, use a voltometer with a 10 Vdc scale, connect-
ed as illustrated in Fig. 27.
D3020
Boiler
Clean the boiler as indicated in its accompanying instructions in or-
der to maintain all the original combustion characteristics intact, es-
pecially the flue gas temperature and combustion chamber
pressure.
Gas leaks
Make sure that there are no gas leaks on the pipes between the
gas meter and the burner.
Gas filter
Replace the gas filter when it is dirty.
Combustion
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.
25
GB
Fig. 27
20060897
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