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8.6
Air damper adjustment
The mobile air damper A)(Fig. 20) operated by the jack B) as-
sures the complete opening of the air intake.
The regulation of the air rate is made by adjusting the fixed air
damper C), after loosing the screws D).
When the optimal regulation is reached, screw tight the screws D)
to assure a free movement of the mobile air damper A).
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.
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.
WARNING
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.
When the burner works at a firing rate higher than 17 kg/h remove
the panel 1)(Fig. 21) fitted inside the metal cover.
8.7
Electrode setting
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.
WARNING
Before removing or assembling the nozzle, loosen the screw
A)(Fig. 22) and move the electrodes ahead.
Start-up, calibration and operation of the burner
A
D
D5775
D5287
4 ± 0.3 mm
A
D5288
21
GB
B
C
D
Fig. 20
Fig. 21
Move the electrode holder
backwards to the end
6.5 ± 0.5 mm
Fig. 22
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