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5.9.2
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.
5.9.3
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 can enter the burner from the right or left side, de-
pending on which is the most convenient, see Fig. 26.
The gas train must be connected to the gas attachment
1)(Fig. 26), with the flange 2), the gasket 3) and the screws 4)
supplied with the burner.
The gas solenoids must be as close as possible to
the burner, to ensure that the gas reaches the
combustion head within the safety time of 3s.
WARNING
Ensure that the maximum pressure to the burner
is within the calibration range of the pressure reg-
ulator.
See the accompanying instructions for the adjustment of the gas
train.
Installation
5.9.4
Tab. O indicates the pressure drop of the combustion head and
the gas butterfly valve depending on the operating output of the
burner.
The values shown in Tab. O refer to:
–
–
Column 1
Load loss at combustion head.
Gas pressure measured at the test point 1)(Fig. 27), with:
•
•
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 27) with maximum
opening: 90°.
To know the approximate output at which the burner is operating
at its maximum:
–
–
–
Example with natural gas G 20:
Maximum output operation
Gas pressure at test point 1)(Fig. 27)
Pressure in combustion chamber
A maximum output of 1600 kW shown in Tab. O corresponds to
20.3 mbar pressure, column 1.
D722
This value serves as a rough guide; the effective output must be
measured at the gas meter.
To know the required gas pressure at test point 1)(Fig. 27), set
the maximum output required from the burner operation, then:
–
–
–
Fig. 26
27
GB
Gas pressure
1 p (mbar)
kW
G 20
930
5.6
1100
7.5
1300
9.7
1600
13.0
1860
17.7
1383
9.0
1500
10.7
1800
14.7
2100
20.3
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 output;
Subtract the combustion chamber pressure from the gas
pressure measured at test point 1)(Fig. 27).
Find, in the Tab. O relating to the burner concerned, column
1, the pressure value closest to the result you want.
Read the corresponding output on the left.
16.0 - 3.0
find the nearest output value in the Tab. O for the burner in
question.
Read, on the right (column 1) the socket pressure 1)(Fig. 27).
Add this value to the estimated pressure in the combustion
chamber.
2 p (mbar)
G 25
G 20
G 25
8.4
0.0
0.0
11.2
0.0
0.0
14.5
0.8
1.2
19.4
3.0
4.5
26.4
3.8
5.7
13.4
3.1
4.7
16.0
3.7
5.5
21.9
5.3
7.9
30.3
7.2
10.7
41.8
9.4
14.0
Tab. O
3
3
(8.2 Mcal/Sm
)
3
3
(7.0 Mcal/Sm
)
=
16.0 mbar
=
3.0 mbar
=
13.0 mbar
20164541
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