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5. BURNER ADJUSTMENT
Establish, on the basis of the output desired, and in accordance with the table and the diagram underneath:
- the type of nozzle;
- the pump pressure;
- the combustion head setting.
EXAMPLE
The burner has to be matched with a boiler of 220 kW.
Assuming an efficiency of 90%, we need to develop approximately 245 kW i.e. burning reughly 21 kg/h.
Starting from 21 kg/h in the delivery column, we find in the other columns the nozzle necessary (two 2.50 GPH - or
one 3.00 GPH and one 2.00 GPH - with 60° atomisation angle), the pump pressure (12 bar), and the position of the
combustion head (notch 5).
Burner delivery (1)
kg/h +10%
12
15
17
19
21
24
(1) The indicated outputs are drawn from the average statistical data of our tests. Real output may well vary by
+10%.
(2) Nozzles of the major existing makers may be used.
It might well be possible however, that for certain specific outputs, one type of nozzle is less suitable than others.
It is recommended not to change the atomizing angle.
(3) The pressure is adjusted by turning screw 5 (Fig. 1) on the pump; it is monitored by installing a pressure gauge
on connection 4 (Fig. 1).
The measurement indicated (12 bar) can be varied by +2 bar (e.g. to adjust the delivery); a pressure of 14 bar
for low temperature firing is advised.
(4) See below.
5.1 COMBUSTION HEAD ADJUSTMENT
This is effected when the nozzle is fitted, with the blast tube disassembled.
The adjustment depends on the required delivery to the burner and it is done by turning adjustment bar 9 (fig. 1)
untill the edge of the blast tube is aligned with the notch indicated by the table on this page (see above).
In figure 3, for example, head is set for a delivery 3.50 GPH at 12
bar; notch 3 on the indicator in fact coincides with the edge of blast
tube.
Head adjustments shown on the table on the previous page are
correct in the majority of cases; adapting the fan delivery to the
burner is normally done only with the air gate valve.
If revision of the head adjustment is required, remember that by
turning the adjustment bar clockwise the air delivery is increased.
By turning the adjustment bar anti-clockwise the air delivery is
reduced.
Do not under any circumstances move the head adjustment more
than one notch either side of the measurement obtained from the
table.
The burner leaves the factory with the head set at notch 4.
Nozzle (2)
GPH
Angle
1.50 + 1.50
60°
1.75 + 1.25
1.75 + 1.75
60°
2.00 + 1.50
2.00 + 2.00
60°
2.25 + 1.75
2.25 + 2.25
60°
2.50 + 2.00
2.50 + 2.50
60°
3.00 + 2.00
3.00 + 3.00
60°
3.50 + 2.50
Pump pressure (3)
bar
12
12
12
12
12
12
6
Combustion head
setting (4)
Notch
1
2
3
4
5
6
Fig. 3
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