3337
3
FIRING RATE
TEST BOILER
The firing rate has been defined according to EN 676 standard.
COMMERCIAL BOILERS
The burner-boiler matching is assured if the boiler is according to EN 303 and the combustion
chamber dimensions are similar to those shown in the diagram EN 676.
For applications where the boiler is not according to EN 303, or where the combustion chamber
dimensions differ from those shown in EN 676, please consult the manufacturers.
CORRELATION BETWEEN GAS PRESSURE AND BURNER OUTPUT
To obtain the maximum output, a gas head pressure of 4.6 mbar is measured with the combustion
chamber at 0 mbar using gas G20 with a net heat value of 10 kWh/m
3
(8,570 kcal/m
3
).
0.8
0
0.2
0.4
0.6
Pressure i
n
the co
mbustion
cham
ber – mba
r
20,000
30,000
40,000
50,000
kcal/h
20
40
30
50
60
kW
Burner output
D5053
1.0
Gas pressu
re
mba
r
4
1
2
3
5
6
20,000
30,000
40,000
50,000
kcal/h
20
40
30
50
60
kW
Burner output
D5054