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8
Start-up, calibration and operation of the burner
8.1
Notes on safety for the first start-up
The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
WARNING
tions of the laws in force.
8.2
Burner calibration
Qualified personnel with the right instruments
must handle the burner's start-up.
WARNING
8.2.1
Firing
During the first firing, when the 2
temporary decrease in fuel pressure takes place. This lowering of
the fuel pressure can cause the burner to lock-out and can some-
times give rise to pulsations.
Once the following adjustments have been made, the firing of the
burner must generate a noise similar to the noise generated dur-
ing operation.
If one or more pulsations or a delay in firing in respect to the
opening of the fuel solenoid valve occur, see the suggestions pro-
vided on page 29: causes 29 - 35.
8.2.2
Operation
The optimum calibration of the burner requires an analysis of the
flue gases at the boiler outlet and interventions on the following
points:
1st and 2nd nozzles
•
See the information listed on page 16.
Combustion head
•
The adjustment of the combustion head already carried out (see
page 17) need not be altered unless the delivery of the burner is
changed.
Pump pressure (gas oil)
•
12 bar: This is the pressure calibrated in the factory which is
usually sufficient for most purposes.
Sometimes, this pressure must be adjusted to:
10 bar: in order to reduce fuel delivery.
This is only possible if the room temperature is above
0 °C. Never fall below 10 bar: at which pressures the cyl-
inders may have difficulty in opening;
14 bar: in order to increase fuel delivery or to ensure firings even
at temperatures of less than 0°C. In order to adjust pump
pressure, use the screw 5)(Fig. 22 on page 21).
Pump pressure (kerosene)
•
10 bar: maximun pressure for kerosene.
Fan air gate valve
•
Adjust the fan air gate valve by using the indexed selector
1)(Fig. 24) after having loosened the nut 2).
This setting must be adapted case by case to the burner's deliv-
ery (while both nozzles are operating) and combustion chamber
pressure.
Air pressure at attachment 1)(Fig. 25) must be approximately the
same as the pressure specified in Tab. J plus the combustion
Start-up, calibration and operation of the burner
nd
nozzle piping is being filled, a
Check the correct working of the adjustment, com-
mand and safety devices.
WARNING
chamber pressure measured at attachment 2). Refer to the ex-
ample in the Fig. 25.
D7438
Air pressure in 1) with zero pressure in 2)
Gas oil
kg/h
9
11
13
16
18
20
23
25
28
30
33
GB
23
D593
Kerosene
mbar
kg/h
3.8
9
2.6
10
3.4
12
4.5
14
5.2
16
6.1
18
6.3
20
6.7
23
6.8
25
7.7
27
8.2
30
33
Fig. 24
Fig. 25
mbar
4
2.8
3.4
4.4
5.3
6
6.2
6.7
7
7.7
8.2
8.5
Tab. J
6426
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