21
2903430
GB
Start-up, calibration and operation of the burner
8.5
Electrodes setting
Before removing or assembling the nozzle, loosen the screw
A)(Fig. 20) and move the electrodes ahead.
8.6
Air damper adjustment
The air damper is set in factory. This regulation is purely indica-
tive.
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.
8.6.1
Main air damper
The main air damper can be set in either of two positions.
To set the positions of the damper, proceed as follows:
➤
remove the secondary air damper B)(Fig. 21) loosing the
screws 1).
➤
Loosen the screw 2) and rotate the main air damper A) to
the required position.
➤
Retighten the screw 2) and put back the secondary air
damper B).
8.6.2
Secondary air damper
The purpose of this damper is to perform a fine-tuning of the inlet
air.
Tuning of this device is possible acting of the screw 3)(Fig. 22).
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. 20
WARNING
Only for code 3518465 - 3514260
The air setting is performed by mean of two inde-
pendent dampers (see Fig. 21 and Fig. 22).
Fig. 21
B
1
2
A
D7532
3
D8647
Fig. 22
