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Maintenance
UV sensor
Clean the glass cover from any dust that may have accumulated.
The photo-electric cell 1)(Fig. 45) is held in position by a pressure
fit and can therefore be removed by pulling it outward forcefully.
Burner
Check that there are not excess wear or loosen screws. The
screws securing the electrical leads in the burner plugs should
also be fully tightened.
Clean the outside of the burner.
Clean and grease the adjustable profile of the cams.
Fan
Check to make sure that no dust has accumulated inside the fan
or on its impellers, 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
order to maintain all the original combustion characteristics in-
tact, especially: the flue gas temperature and combustion cham-
ber pressure.
Flame presence check
Check the level of the flame detection signal with the “Check
Mode” function from the flame control: LEDs from 2 to 6 indicate
the flame signal level, respectively. See “LED lamps: burner
operating status” on page 42.
Check Mode
With burner flame on:
hold the reset button on the flame control pressed for at
least 3 sec.;
the button colour will change from green to yellow;
each operating status signalling LED will be compared to
20% of the maximum brightness;
press the reset button again (<0.5sec) to reset the standard
operation of the signalling LEDs.
Pump
The delivery pressure
must comply with the table on page 24.
The depression must be less than 0.45 bar.
Unusual noise must not be evident during pump operation.
If the pressure is unstable, or 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 piping or the pump.
If the problem lies in the suction line, check 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
system.
Clean or replace if necessary.
If rust or other impurities are observed inside the pump, use a
separate pump to lift any water and other impurities that may
have deposited on the bottom of the tank.
Nozzles
It is advisable to replace nozzles once a year during periodical
maintenance.
Do not clean the nozzle openings.
Flexible hoses
Check to make sure that the hoses are still in good condition.
Fuel tank
Approximately every 5 years, suck any water on the bottom of the
tank using a separate pump.
Combustion
If the combustion values measured before starting maintenance
do not comply with applicable Standards or do not indicate effi-
cient combustion, consult the table below or contact our Techni-
cal Support Service to implement the necessary adjustments.
Tab. N
LIGHT OIL OPERATION
EN 267
Air excess
CO
Max. output
1.2
Min. output
1.3
Theoretical max CO
2
0 % O
2
CO
2
% Calibration
mg/kWh
= 1.2 = 1.3
15.2 12.6 11.5 100
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