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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.
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. 52) 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. 52.
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
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.
Clean and grease the cam variable profile.
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.
Pump
Delivery pressure must correspond with the Tab. F at page 25.
The depression must be less than 0.45 bar
Unusual noise must not be evident during pump operation
If the pressure is found to be unstable or if the pump runs noisily,
the flexible hose must be detached from the line filter and the fuel
must be sucked from a tank located near the burner. This measure
permits the cause of the anomaly to be traced to either the suction
line or the pump.
If the problem lies in the suction line, check to make sure that the
filter is clean and that air is not entering the piping.
Filters
Check the filtering baskets on line and at nozzle present in the sys-
tem. Clean or replace if necessary.
If rust or other impurities are observed inside the pump, use a sep-
arate pump to lift any water and other impurities that may have de-
posited on the bottom of the tank.
Nozzles
It is advisable to replace nozzles every year during regular main-
tenance operations.
Do not clean the nozzle openings; do not even open them.
Fig. 52
49
GB
LIGHT OIL OPERATION
.
.
20037168
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