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5.11.2 Gas train
Type-approved in accordance with EN 676 and supplied sepa-
rately from the burner.
To select the correct model of the gas train, refer to the "burner-
gas train combination" manual supplied.
5.11.3 Gas train installation
Disconnect the electrical supply by means of the
system's main switch.
DANGER
Make sure 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 prearranged to be connected to the burner with
the flange 1)(Fig. 20).
20062301
20061862
Installation
5.11.4 Gas pressure
Tab. K indicates the pressure drop of the combustion head and
the gas butterfly valve depending on the operating output of the
burner.
kW
3750
4000
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
10000
10600
5500
6000
6500
7000
7500
8000
8500
9000
9500
10000
10500
11000
11500
The values shown in Tab. K refer to:
–
Natural gas G 20 NCV 9.45 kWh/Sm
–
Natural gas G 25 NCV 8.13 kWh/Sm
Column 1
Pressure drop on combustion head.
Gas pressure measured at the test point 1) (Fig. 21), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum modulating output;
•
combustion head adjusted as in page 18.
Column 2
Pressure loss at gas butterfly valve 2) (Fig. 21) with maximum
opening: 90°.
Fig. 20
To calculate the approximate output at which the burner oper-
ates:
–
Subtract the combustion chamber pressure from the gas
pressure measured at test point 1) (Fig. 21).
–
Find, in the table Tab. K related to the burner concerned, the
pressure value closest to the result of the subtraction.
–
Read off the corresponding output on the left.
20
GB
1 ∆ p (mbar)
2 ∆ p (mbar)
G 20
G 25
G 20
9.2
13.7
1.0
10.8
16.0
1.1
13.9
20.7
1.4
17.0
25.4
1.7
20.2
30.1
2.1
23.3
34.8
2.4
26.4
39.4
2.9
30.4
45.3
3.3
34.8
51.9
3.8
39.2
58.5
4.4
43.6
65.1
4.9
49.2
73.3
5.5
55.0
82.0
6.1
60.8
90.7
6.8
67.8
101.1
7.6
23.1
34.5
2.1
27.9
41.6
2.4
32.6
48.7
2.9
37.4
55.7
3.3
42.1
62.8
3.8
48.3
72.1
4.4
54.5
81.3
4.9
60.7
90.6
5.5
67.0
99.8
6.1
74.3
110.8
6.8
81.9
122.2
7.5
89.6
133.6
8.2
97.2
145.0
9.0
3
(8.2 Mcal/Sm
3
(7.0 Mcal/Sm
G 25
1.4
1.6
2.1
2,5
3.1
3.7
4.3
5.0
5.7
6.5
7.3
8.2
9.2
10.1
11.4
3.1
3.7
4.3
5.0
5.7
6.5
7.3
8.2
9.2
10.2
11.2
12.3
13.4
Tab. K
3
)
3
)
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