19
20032173
GB
Start-up, calibration and operation of the burner
8.4
Pump pressure
8.5
Air damper adjustment
The mobile air damper 1)(Fig. 15) operated by the jack 2) as-
sures the complete opening of the air intake.
The regulation of the air-rate is made by adjusting the fixed air
damper 3), after loosing the screws 4).
When the optimal regulation is reached, screw tight the screws 4)
to assure a free movement of the mobile air damper 1).
The settings indicated in the Tab. E refer to the burner with its
metal cover fitted and the combustion chamber with “zero” de-
pression.
These regulations are purely indicative.
Each installation however, has its own unpredictable working
conditions: actual nozzle output; positive or negative pressure in
the combustion-chamber, the need of excess air, etc.
All these conditions may require a different air damper setting.
Therefore we recommended to proceed as follows:
adjust the air damper as indicated in the Tab. E;
mount the cover, simply by means of the upper screw;
check smoke number;
should it become necessary to modify the air output,
remove the cover by loosening the screw, adjust the air
damper, remount the cover and finally recheck the smoke
number.
8.6
Electrode setting
Before removing or assembling the nozzle, loosen the screw
A)(Fig. 16) and move the electrodes ahead.
Gas oil fuel
8 bar:
the pump leaves the factory set at this value, which is
suitable only for kerosene.
For gas oil increase pressure
12 bar:
pressure suitable for gas oil in most cases.
14 bar:
improves flame retention; it is therefore suitable for ig-
nitions at low temperatures.
Kerosene fuel
8 bar:
the pump leaves the factory set at this value.
10 bar:
maximum pressure for kerosene.
WARNING
It is important to take account of the fact that the
air output of the fan differs according to whether
the burner has its metal cover fitted or not.
Fig. 15
2
3
4
4
1
D5550
WARNING
The position of the electrodes cannot be regulat-
ed. In case of failure, check that the measure-
ments as shown on the figure are respected.
4
±
0.3 mm
D5230
A
2 - 2.5 mm
Fig. 16
