20119857
14
GB
Start-up, calibration and operation of the burner
6.5
Electrodes setting
Before removing or assembling the nozzle, loosen the screw (
A
,
see Fig. 13) and move the electrodes ahead.
6.6
Fuel heating
In order to obtain smooth starting and operation across its output
range the burner is fitted with an electric resistance, which heats
up the light oil in the nozzle line.
This resistance is energized when the thermostat calls for heat
and after a delay of approximately two minutes depending on
room temperature, the motor will start.
The resistance remains energised during working and cuts out
when burner shuts-down.
6.7
Air damper adjustment
The settings indicated in the schedule are purely indicative. Each
installation however, has its own unpredictable working condi-
tions: 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.
WARNING
These dimensions Fig. 13 must be respected.
Fig. 13
4
±
0.3 mm
A
2
-
2.5 mm
D5230
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