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5.14.2 Gas train
Approved according to standard EN 676 and provided separately
from the burner.
5.14.3 Gas train installation
Disconnect the electrical power using the main
system switch.
DANGER
Check that there are no gas leaks.
Beware of train movements: danger of crushing of
limbs.
Make sure that the gas train is properly installed
by checking for any fuel leaks.
The operator must use appropriate tools for instal-
lation.
The gas train is prearranged to be connected to the burner by the
flange 1)(Fig. 26).
20053395
The data of thermal output and combustion
head gas pressure are related to full open (90°)
gas butterfly valve.
WARNING
Installation
5.14.4 Gas pressure
The Tab. L 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. L refer to:
–
Natural gas G 20 NCV 9.45 kWh/Sm
–
Natural gas G 25 NCV 8.13 kWh/Sm
Column 1
Pressure loss at combustion head.
Gas pressure measured at test point 1)(Fig. 27), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum modulating output;
Fig. 26
•
combustion head set as in page 20.
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 27) with maximum
opening: 90°.
Calculate the approximate output of the burner thus:
–
Subtract the combustion chamber pressure from the gas
pressure measured at test point 1)(Fig. 27).
–
Find, in the Tab. L related to the burner concerned, the pres-
sure value closest to the result of the subtraction.
–
Read off the corresponding output on the left.
25
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. L
3
)
3
)
20061317
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