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5.8.3
Gas train
Approved according to standard EN 676 and provided separately
from the burner.
To select the correct gas train model, refer to the supplied "Burn-
er-gas train combination" manual.
5.8.4
Gas train installation
Disconnect the electrical power using the main
switch.
DANGER
Check that there are no gas leaks.
Pay attention when handling the train: danger of
crushing of limbs.
Make sure that the gas train is properly installed
by checking for any fuel leaks.
The operator must use the required equipment
during installation.
The gas train is set up to be connected to the burner by the flange
2)(Fig. 12).
20119312
20118862
Installation
5.8.5
Tab. H indicates the pressure drops of the combustion head and
gas butterfly valve, on the basis of the burner operating output.
The values shown in Tab. H refer to:
–
–
1
Column 1
Combustion head pressure drop.
Gas pressure measured at test point 1)(Fig. 15), with:
•
•
•
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 15) with maximum
opening: 90°.
2
To calculate the approximate output at which the burner oper-
ates:
–
–
–
Example DB 2 SM C03 with natural gas G20:
Fig. 15
Operation at maximum modulating output
Gas pressure at test point 1)(Fig. 15)
Pressure in combustion chamber
A pressure of 14.7 mbar, column 1, corresponds in Tab. H to an
output of 1800 kW.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
18
GB
Gas pressure
1 ∆ p (mbar)
kW
G 20
930
4.3
1000
5.1
1100
6.2
1200
7.4
1300
8.6
1400
10.0
1500
11.5
1600
13.1
1700
14.7
1860
17.7
1383
9.0
1400
9.3
1500
10.7
1600
12.0
1700
13.3
1800
14.7
1900
16.0
2000
18.2
2100
20.3
2235
22.5
2300
24.9
2400
28.0
Natural gas G 20 NCV 9.45 kWh/Sm
Natural gas G 25 NCV 8.13 kWh/Sm
combustion chamber at 0 mbar;
burner working at maximum modulating output;
combustion head set as on page 22.
subtract the pressure in combustion chamber from the gas
pressure measured at test point 1) (Fig. 15).
Find, in Tab. H related to the burner concerned, the pressure
value closest to the result of the subtraction.
Read off the corresponding output on the left.
19.7 - 5
2 ∆ p (mbar)
G 25
G 20
G 25
6.5
0.9
0.7
7.7
1.0
0.7
9.4
1.3
1.0
11.2
1.6
1.2
13.0
1.9
1.4
15.2
2.2
1.6
17.4
2.6
1.9
19.8
2.9
2.1
22.3
3.3
2.4
26.8
3.8
2.8
13.5
3.1
4.2
14.0
3.2
4.3
16.0
3.7
5.0
18.0
4.2
5.7
20.0
4.7
6.4
22.0
5.3
7.2
24.0
5.9
8.0
27.3
6.5
8.8
30.5
7.2
9.7
33.8
7.9
10.7
37.4
8.6
11.6
42.0
9.4
12.7
Tab. H
3
3
(8.2 Mcal/Sm
);
3
3
(7.0 Mcal/Sm
).
= 19.7 mbar
=
5 mbar
= 14.7 mbar
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