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5.13.2 Gas train
Type-approved in accordance with EN 676 and supplied
separately from the burner.
To select the correct gas train model, refer to the manual "Burner-
gas train combination" supplied with the unit.
5.13.3 Gas train installation
Disconnect the power supply using the system
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).
D3095
20148124
Installation
5.13.4 Gas pressure
Tab. L indicates the pressure drops of the combustion head and
gas butterfly valve depending on the burner operating output.
kW
3500
4000
4500
5000
5500
6000
6500
7000
7500
8000
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
Combustion head pressure drop.
Gas pressure measured at test point P1)(Fig. 27), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum modulating output;
•
combustion head adjusted as in page 19.
Column 2
Pressure loss at gas butterfly valve P2)(Fig. 28) with maximum
opening: 90°.
To calculate the approximate output at which the burner
operates:
–
subtract the pressure in the combustion chamber from the
pressure of the gas at test point P1)(Fig. 28).
–
Find in Tab. L related to the burner concerned, the pressure
value closest to the result of the subtraction.
Read the corresponding output on the left.
Data of head thermal power and gas pressure
refer to operation with gas butterfly valve fully
open (90°).
ATTENTION
P1
Fig. 27
24
GB
1 p (mbar)
G 20
G 25
G 20
11.5
16.5
2.7
15.2
22.3
3.6
19.0
28.1
4.5
22.7
33.9
5.5
26.4
39.7
6.7
30.2
45.5
8.0
35.4
51.3
9.4
38.9
57.9
10.9
44.8
66.6
12.5
50.6
75.4
14.2
3
(8.2 Mcal/Sm
3
(7.0 Mcal/Sm
2 p (mbar)
G 25
3.5
4.6
5.8
7.2
8.7
10.3
12.1
14.0
16.1
18.3
Tab. L
3
)
3
)
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