Start-up, calibration and operation of the burner
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6.6 Installation of the graduated index
If necessary, the graduated index 1) can be installed or disas-
sembled.
Insert the graduated index 1) into the knob and connect it to the
pipe 2)(Fig. 19).
6.7 Air damper adjustment
The air damper is factory set to the values indicated in Tab. G on
page 17.
These adjustments are 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.
The damper 1)(Fig. 20) is used to precisely adjust the input air
flow rate.
To modify the setting use the screw 2) as shown in Fig. 20.
In the 15 - 21 kW model there is another air damper calibrated in
the factory to notch B (Fig. 20).
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