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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
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 prearranged to be connected to the burner by the
flange 1)(Fig. 27).
20124124
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
Tab. H indicates the pressure drop of the combustion head and
the gas butterfly valve depending on the operating output of the
burner.
kW
9503
10200
10900
11600
12400
13100
13800
14500
15200
15560
15200
15700
16300
16800
17400
17900
18500
19000
19600
20100
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. 28, page 26), 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. 28, page 26) with
maximum opening: 90°.
1
To calculate the approximate output at which the burner oper-
ates:
Fig. 27
-
subtract the pressure in combustion chamber from the gas
pressure measured at test point 1)(Fig. 28, page 26).
-
Find, inTab. H related to the burner concerned, the pressure
value closest to the result of the subtraction.
-
Read off the corresponding output on the left.
Example RLS 1600/E C11 with natural gas G20:
Operation at maximum modulating output
Gas pressure at test point 1)(Fig. 28)
Pressure in combustion chamber
A pressure of 41 mbar, (column 1, corresponds in Tab. H to an
output of 12400 kW.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
25
GB
1 p (mbar)
2 p (mbar)
G 20
G 25
G 20
23
34
13
27
40
14
31
46
15
35
52
16
41
61
17
46
69
18
51
76
20
56
83
22
62
92
24
66
98
26
58
86
11
62
92
13
67
100
16
71
106
19
76
113
21
81
121
24
87
130
27
92
137
30
98
146
33
104
155
36
3
(8.2 Mcal/Sm
3
(7.0 Mcal/Sm
=
=
46 - 5
=
G 25
19
21
22
24
25
27
30
33
36
39
16
19
24
28
31
36
40
45
49
54
Tab. H
3
)
3
)
46 mbar
5 mbar
41 mbar
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