19
2902812
GB
Start-up, calibration and operation of the burner
8.4
Pump pressure
8.5
Combustion head adjustment
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 rotat-
ing the regulating rod, till the terminal plane of the blast tube is
level with the set-point, as indicated in the Tab. E.
Exsemple: the combustion head is set for an output of:
– 2.00 GPH at 8 bar (for kerosene)
– 1.25 GPH at 12 bar (for gas oil)
The shutter is level with set-point 2.5, as required by the Tab. E.
Combustion head settings indicated in the Tab. E 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)(Fig. 17) 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
2
and the adhesion of the flame to the air diffuser disc im-
proves. (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 pressure. The CO
2
improves
and the adhesion of the flame to the diffuser tends to reduce.
(This setting is 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 Tab. E.
One set-point corresponds to 3 turns of the rod; a hole 3)(Fig. 17)
at its end facilitates counting the number of turns.
8.6
Air damper adjustment
The mobile air damper A)(Fig. 18) operated by the jack B) as-
sures the complete opening of the air intake.
The regulation of the air rate is made by adjusting the fixed air
damper C), after loosing the screws D).
When the optimal regulation is reached, screw tight the screws D)
to assure a free movement of the mobile air damper A).
The settings indicated in the Tab. E refer to the burner with its
metal cover fitted and the combustion chamber with “zero” de-
pression.
These regulations 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.
All these conditions may require a different air-damper setting.
Kerosene fuel
8 bar:
pressure suitable for kerosene in most cases.
10 bar:
maximum pressure for kerosene.
Gas oil fuel
For gas oil increase pressure
12 bar:
pressure suitable for light oil in most cases.
14 bar:
maximum pressure light oil.
Fig. 16
Blast tube
Regulating rod
Shutter
Terminal plane of the blast tube
D5676
2
1
3
5
Fig. 17
2
6 mm
D8068
3
1
Fig. 18
B
C
D
D
A
D5782
