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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-
tents of this manual and in compliance with the
DANGER
standards and regulations of current laws.
6.2
Maintenance programme
6.2.1
Maintenance frequency
The combustion system should be checked at least once a year
by a representative of the manufacturer or another specialised
technician.
6.2.2
Checking and cleaning
Combustion
The optimum calibration of the burner requires an analysis of the
flue gases. Significant differences with respect to the previous
measurements indicate the points where more care should be ex-
ercised during maintenance.
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.
Measurement of detector current
Measurement of the detector's signal (Fig. 39) 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. 39.
D3020
Maintenance
Before carrying out any maintenance, cleaning or checking opera-
tions:
Disconnect the electricity supply from the burner by
means of the main switch of the system.
DANGER
Close the fuel interception tap.
DANGER
QRI flame detector
In order to reach the QRI flame detector, proceed as follows:
loosen, without removing the screws 1);
extract the QRI flame detector 2);
clean the glass cover from any dust that may have accumu-
lated.
1
2
Burner
Clean the outside of the burner.
Clean and grease the cam variable profile.
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.
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 pipework between the
gas meter and the burner.
Fig. 39
33
GB
D10804
Fig. 40
20044771
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