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5.11.2 Gas train
Type-approved in accordance with EN 676 and supplied sepa-
rately from the burner.
5.11.3 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.
D722
5.11.4 Gas pressure
Installation
Tab. P indicates the pressure drop of the combustion head and
the gas butterfly valve depending on the operating output of the
burner.
kW
350
500
650
750
860
600
760
955
1170
1300
930
1100
1300
1600
1860
1383
1500
1800
2100
2400
The heat output and gas pressure in the head
data refer to operating with the gas butterfly
valve fully open (90°).
WARNING
The values shown in Tab. P refer to:
–
Natural gas G 20 NCV 9.45 kWh/Sm
–
Natural gas G 25 NCV 8.13 kWh/Sm
Column 1
Load loss at combustion head.
Gas pressure measured at the test point 1)(Fig. 27), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum output;
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 27) with maximum
opening: 90°.
Fig. 26
31
GB
1 p (mbar)
G 20
G 25
G 20
2.0
3.0
0.1
5.0
7.5
0.2
7.7
11.5
0.3
9.7
14.5
0.4
11.7
17.5
0.5
4.4
6.6
0.3
9.2
13.7
0.4
14.0
20.9
0.6
18.7
27.9
0.8
22.5
33.6
1.2
5.6
8.4
0.0
7.5
11.2
0.0
9.7
14.5
0.8
13.0
19.4
3.0
17.7
26.4
3.8
9.0
13.4
3.1
10.7
16.0
3.7
14.7
21.9
5.3
20.3
30.3
7.2
28.0
41.8
9.4
3
(8.2 Mcal/Sm
3
(7.0 Mcal/Sm
2 p (mbar)
G 25
0.1
0.3
0.4
0.6
0.7
0.4
0.6
0.9
1.2
1.8
0.0
0.0
1.2
4.5
5.7
4.7
5.5
7.9
10.7
14.0
Tab. P
3
)
3
)
20068435
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