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4.6
Firing rate
The burner output is chosen from within the diagram area
(Fig. 2).
2.4
2.0
1.6
1.2
0.8
0.4
0
25
25,000
4.6.1
Test boiler
The firing rate has been defined according to EN 676 standard.
4.6.2
Commercial boilers
The burner-boiler matching is assured if the boiler conforms to
EN 303 and the combustion chamber dimensions are similar to
those shown in the diagram EN 676.
4.7
Correlation between gas pressure and burner output
To obtain the maximum burner output (Fig. 3), 5.25 mbar meas-
ured at the pipe coupling are needed (M2, Fig. 16 on page 17)
with the combustion chamber at 0 mbar and gas G20 - Ncv = 10
3
3
kWh/Nm
(8,570 kcal/Nm
).
7
6
5
4
3
2
1
0
25
30
25.000
Technical description of the burner
30
40
50
35,000
45,000
40
50
60
35.000
45.000
WARNING
60
70
80
55,000
65,000
Thermal power
For applications where the boiler does not conform to EN 303, or
where the combustion chamber is much smaller than the dimen-
sions given in EN 676, please consult the manufacturers.
70
80
55.000
65.000
75.000
Thermal power
9
GB
The firing rate value (Fig. 2) has been obtained
considering an ambient temperature of 20°C, an
atmospheric pressure of 1013 mbar (approx. 0m
above sea level), and with the combustion head
adjusted as shown on page 16.
D5175
90
100
75,000
85,000
95,000
D5176
90
100
110
85.000
95.000
110
kW
kcal/h
Fig. 2
kW
kcal/h
Fig. 3
20063795
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