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3
COMBUSTION HEAD SETTING
This is done when fitting the nozzle, with the blast tube removed. It depends on the output of the
burner and is carried out by rotating the regulating rod, till the terminal plane of the blast tube is level
with the set-point, as indicated in the schedule.
In the sketch below, the combustion head is set for an output of 3.50 GPH at 12 bar (for light oil)
or 5.00 GPH at 8 bar (for kerosene).
The shutter is level with set-point 3.5, as required by the schedule at page 6.
2
3
Terminal plane of the blast tube
1
6
2
5
3
1
Regulating rod
D5676
Blast tube
Shutter
D8068
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. Should one subsequently want to retouch also the setting of the combustion head, with the
burner running, operate on the rod (1) with a 6 mm spanner (2) as follows:
+
TURN TO THE RIGHT: (SIGN
)
In order to increase the volume of air entering the combustion chamber and thus diminishing its
pressure.
There is a reduction of CO
and the adhesion of the flame to the air diffuser disc improves.
2
(Setting advisable for ignitions at low temperatures).
TURN TO THE LEFT: (SIGN – )
In order to reduce the volume of air entering the combustion chamber and thus increasing its pres-
sure. The CO
improves and the adhesion of the flame to the diffuser tends to reduce. (This setting is
2
not advisable for ignitions at low temperatures).
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 (3) at its end facilitates counting
the number of turns.
2403
7
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