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6.6
Burner adjustment
The optimum adjustment of the burner requires an analysis of
flue gases at the boiler outlet. The burner application at the gen-
erator, the adjustment and the testing must be carried out in com-
pliance with the instruction manual of the generator itself,
including the control of the CO and CO
gases and of their temperature.
Check in sequence:
Maximum output
Minimum output
Ignition output
Maximum output should match the value required by the boiler
that is used. To increase or decrease its value, adjust the trimmer
MAX located on the control box (Fig. 14).
Measure the gas delivery on the counter to precisely establish the
burnt output.
Using a smoke analyser, measure the value of the CO
in order to optimise the burner calibration.
The correct values are: CO
To correct these values act on the gas valve in the following way:
–
To increase the gas delivery and the CO
anticlockwise (unscrew).
–
To reduce the gas delivery and the CO
clockwise (tighten).
Minimum output should match the value required by the boiler
that is used. To increase or decrease its value, adjust the trimmer
MIN located on the control box (Fig. 14).
Measure the gas delivery on the counter to precisely establish the
burnt output.
Using a smoke analyser, measure the value of the CO
in order to optimise the burner calibration.
The correct values are: CO
To correct these values act on the gas valve in the following way:
–
To increase the gas delivery and the CO
clockwise (tighten).
–
To reduce the gas delivery and the CO
anticlockwise (unscrew).
The ignition output can be varied by acting on the Trimmer
START located on the control box (Fig. 14).
mg/kWh
20028767
concentration in the flue
2
8.5 ÷ 9% or O
5÷5.5%.
2
2
: turn the screw V1
2
: turn the screw V1
2
8.5÷9% or O
5÷5.5%.
2
2
: turn the screw V2
2
: turn the screw V2
2
CLASS 3 LIMIT = 80 mg/kWh
70
60
50
40
CO
30
NOx
20
10
0
Minimum
modulation 7 kW
Operation
6.7
Combustion head
The combustion head comprises a highly thermal resistant cylin-
der whose surface features numerous holes, encased in a metal
"mesh" (Fig. 15).
The air-gas mixture is pushed inside the cylinder and out of the
head through the holes in the perimeter.
Combustion starts when the air-gas mixture is ignited by a spark
generated by the electrode.
The metal "mesh" is the combustion head's most essential ele-
ment since it improves burner performance considerably.
The flame developed on the surface of the head is perfectly re-
tained and adheres to the mesh when operating at the maximum
setting. This allows modulating ratios as high as 6:1, avoiding the
danger of flashback when modulating is at its minimum.
The flame features an extremely compact geometry, meaning
that there is no risk of contact between the flame and parts of the
or the O
2
2
generator, consequently eliminating the possible problem of poor
combustion.
The flame's structure means that smaller combustion chambers
can be developed, designed to exploit this particular feature.
or the O
2
2
D9714
6.8
Emissions
The emission values of the burners are much lower than the limits
laid down by the strictest standards. The flame's distribution and
its spread over a large surface means that the burner manages
to limit the formation of thermal NOx, the main causes of pol-
lutant emission.
NOx
Maximum
modulation 35 kW
16
GB
CO
Fig. 15
Fig. 16
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