Gas Train; Gas Train Installation; Gas Pressure - Riello DB 4 SM C03 A0 TC FS1 FB T150 Installation, Use And Maintenance Instructions
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5.9.3
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.
5.9.4
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. 13).
5.9.5
Gas pressure
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:
–
Natural gas G 20 NCV 9.45 kWh/Sm
–
Natural gas G 25 NCV 8.13 kWh/Sm
Column 1
Combustion head pressure drop.
Gas pressure measured at test point 1)(Fig. 16), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum modulating output;
•
combustion head set as on page 22.
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 16) with maximum
opening: 90°.
To calculate the approximate output at which the burner oper-
ates:
–
subtract the pressure in combustion chamber from the gas
pressure measured at test point 1) (Fig. 16).
–
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.
20117017
Installation
3
3
(8.2 Mcal/Sm
);
3
3
(7.0 Mcal/Sm
).
18
GB
20118570
1 ∆ p (mbar)
kW
G 20
1800
6.3
2000
7.9
2250
9.9
2500
11.9
2750
13.9
3000
15.9
3250
17.9
3500
19.7
3750
21.1
4000
22.4
4250
27.4
4500
32.5
4000
12.8
4500
16.2
5000
19.6
5500
23.0
6000
26.4
6500
30.9
7000
35.5
7500
40.9
7800
46.3
Example DB4 with natural gas G20:
Operation at maximum modulating output
Gas pressure at test point 1)(Fig. 16)
Pressure in combustion chamber
A pressure of 22.4 mbar, column 1, corresponds in Tab. H to an
output of 4000 kW.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
1
2
2 ∆ p (mbar)
G 25
G 20
9.3
2.9
11.7
3.5
14.7
4.5
17.7
5.5
20.7
6.7
23.7
8.0
26.7
9.3
29.4
10.8
31.4
12.4
33.5
14.2
40.8
16.0
48.4
17.9
17.7
0.7
22.5
0.9
27.3
1.2
32.1
1.4
37.0
1.7
44.7
2.0
52.4
2.3
59.8
2.6
67.1
3.0
= 27.4 mbar
=
5 mbar
27.4 - 5
= 22.4 mbar
Fig. 16
G 25
4.3
5.3
6.7
8.2
10.0
11.9
13.9
16.2
18.6
21.1
23.8
26.7
0.9
1.1
1.4
1.7
2.0
2.3
2.7
3.1
3.5
Tab. H
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