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5.9.2
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.
5.9.3
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 can be connected to the right or left side of the burn-
er, as the situation requires (see Fig. 21).
The gas train must be connected to the gas connection 1)(Fig.
21) using the flange 2), gasket 3) and 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.
CAUTION
Make sure the maximum pressure necessary for
the burner is included in the calibration field of the
pressure adjuster (colour of the spring).
WARNING
See the accompanying instructions for the adjust-
ment of the gas train.
WARNING
20054100
Installation
5.9.4
Gas pressure
Tab. J indicates the pressure drop of the combustion head and
the gas butterfly valve depending on the operating output of the
burner.
kW
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1850
The values shown in Tab. J refer to:
–
natural gas G20 NCV 9.45 kWh/Sm
–
natural gas G25 NCV 8.13 kWh/Sm
Column 1
Combustion head pressure drop.
Gas pressure measured at test point 1)(Fig. 22), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum modulating output;
•
combustion head set as on page 17.
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 22) with maximum
opening: 90°.
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. 22).
–
Find, in Tab. J 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
D722
1 p (mbar)
G 20
G 25
G 20
4.5
6.9
1.4
5.5
8.6
1.8
6.6
10.2
2.1
7.7
11.8
2.5
8.7
13.5
3.0
9.9
15.2
3.4
11.1
17.1
3.9
12.5
19.4
4.5
14.2
22.0
5.1
16.3
25.3
5.7
17.5
27.1
6.0
3
(8.2 Mcal/Sm
3
(7.0 Mcal/Sm
Fig. 21
2 p (mbar)
G 25
1.9
2.3
2.8
3.4
4.0
4.6
5.3
6.0
6.8
7.6
8.0
Tab. J
3
)
3
)
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