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8.5
Maintenance position
Access to the combustion head, electrodes and nozzle.
Loosing the fixing nut to the flange (1) and remove the
burner out of the boiler.
Hook the burner to the flange (1), by removing the blast tube
(2) after loosing the fixing screws (3).
Remove the small cables (4) from the electrodes (5) and the
diffuser disc-holder assembly from the nozzle-holder (6)
after loosing its fixing screw (7).
Once replacement of the nozzle has been made, screw it
and tighten it as shown in the Fig. 19.
8.6
Air damper adjustment
The settings indicated in the schedule refer to the combustion-
chamber with "zero" depression. This regulation is purely indica-
tive.
8.7
Electrodes 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
To adjust the diffuser disc unit, proceed as follows:
Loosen the screw (1, Fig. 18).
Move the diffuser disc unit up to level A.
Tighten the screw (1).
To adjust the electrodes unit, proceed as follows:
Loosen the screw (2, Fig. 18).
Move the electrodes unit up to level B.
Tighten the screw (2).
A
B
Start-up, calibration and operation of the burner
+ 0.7
7.5
- 0.5
4
± 0.5
2
5
4
6
E9191
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.
+ 0.5
3
21
GB
3
7
0
2
D4269
1
1
Fig. 18
B
A
Fig. 19
3226
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