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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
Before removing or assembling the nozzle, loosen the screw (A,
Fig. 23) and move the electrodes ahead.
8.8
Combustion head setting
This is done when fitting the nozzle, with the blast tube (1)
(Fig. 24) removed.
It depends on the output of the burner and is carried out by rotat-
ing the regulating rod (2), till the terminal plane of the blast tube
(3) is level with the set-point, as indicated in the schedule.
Combustion head settings indicated in the schedule are valid for
most cases.
The setting of the fan output according to the installation should
normally be done only through the air damper.
Turn to the right:
in order to increase the volume of air entering the combustion
chamber and thus diminishing its pressure.
There is a reduction of CO2 and the adhesion of the flame to the
air diffuser disc improves.
(Setting advisable for ignitions at low temperatures).
Turn to the left:
in order to reduce the volume of air entering the combustion
chamber and thus increasing its pressure. The CO2 improves
and the adhesion of the flame to the diffuser tends to reduce.
(This setting is not advisable for ignitions at low temperatures).
8.9
Burner start-up cycle
Normal
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
Lock out is indicated by a lamp on the control box (3, Fig. 1 to
page 8)
Start-up, calibration and operation of the burner
~ 12s
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.
4 ±
0.3 mm
D5230
In any case do not bring the combustion head setting more than
one point away from that indicated in the schedule. One set-point
corresponds to 3 turns of the rod; a hole at its end facilitates
counting the number of turns.
D5398
Lock-out due to failure to light
~ 12s
GB
21
A
2 - 2.5
Terminal plane of the blast tube
Regulating rod
2
5
3
1
Blast tube
~ 5s
mm
Fig. 23
Shutter
Fig. 24
D5229
Fig. 25
20026404
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