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8.5
Air damper adjustment
The settings indicated in the schedule 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.
8.6
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
Before removing or assembling the nozzle, loosen the screw
A)(Fig. 20) and move the electrodes ahead.
8.7
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.
8.8
Burner start-up cycle
Normal
Thermostat
Resistance
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
0 - 150s
Lock out is indicated by a lamp on the control box 3)(Fig. 1 to
page 8).
3261
Start-up, calibration and operation of the burner
~12s
All these conditions may require a different air-damper setting.
4 ± 0.3 mm
D5230
The resistance remains energised during working and cuts out
when burner shuts-down.
Lock-out due to failure to light
0 - 150s
20
GB
A
2 - 2.5 mm
~12s
~5s
Fig. 20
D5329
Fig. 21
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