AIR PRESSURE IN 1) WITH ZERO PRESSURE IN 2)
kg/h mbar
9
10
12
14
16
18
20
22
24
26
28
30
32
34
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.9
5.6
6.4
7.1
7.9
D593
D7438
10
BURNER CALIBRATION
QUALIFIED PERSONNEL WITH THE RIGHT
INSTRUMENTS
MUST HANDLE THE BURN-
ER'S START-UP.
FIRING
During the first firing, when the 2nd nozzle piping
is being filled, a temporary decrease in fuel pres-
sure takes place. This lowering of the fuel pres-
sure can cause the burner to lock-out and can
sometime
s 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 during oper-
ation. If one or more pulsations or a delay in firing
in
respect to the opening of the light oil solenoid
valve occur, see the suggestions provided on p.
15: causes 29 - 35.
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 6: “Choice of
nozzles”.
• Combustion head
The adjustment of the combustion head already
carried
out (see page 7) need not be altered
unless the delivery of the burner is changed.
• Pump pressure
12 bar: This is the pressure calibrated in the fac-
tory which is usually sufficient
for most purposes.
Sometimes, this pressure must be adjusted to :
10 bar in order to reduce fuel delivery. This ad-
justment is possible only if the surrounding tem-
perature remains above 0°C;
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)(A)p. 9.
• Fan air gate valve
Adjust the fan air gate valve by using the indexed
selector
1)(A) after having loosened the nut
2)(A).
This setting must be adapted case by case to the
bur
ner's delivery (while both nozzles are operat-
ing) and combustion chamber pressure.
Air pressure at attachment 1)(B) must be approx-
imately the same as the pressure specified in ta-
ble (B) plus the combustion chamber pressure
measured
at attachment 2).
Refer to the example in the adjacent figure.
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