2814
3
GB
2.3
FIRING RATE,
(as EN 676)
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 10.7 mbar is measured (
M2
, see chapter 3.3, page 5)
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
).
Thermal power
Pressure in the combustion
chamber – mbar
130,000
290,000
kW
150
kcal/h
4.8
1.6
0
D4357
170
190
210
230
250
270
290
310
350
3.2
170,000
210,000
250,000
8.0
330
6.4
Thermal power
Gas pressure in the
comb
ustion head – mbar
130,000
290,000
kW
150
kcal/h
6
3
2
D4436
170
190
210
230
250
270
290
310
350
4
170,000
210,000
250,000
7
330
5
8
9
10
11
