Table of Contents
Advertisement
Available languages
Available languages
4.10.3 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.
4.10.4 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 set up to be connected to the burner by the flange
2)(Fig. 12).
4.10.5 Gas pressure
Tab. H indicates the pressure drops of the combustion head and
gas butterfly valve, on the basis of the burner operating output.
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. 18), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum modulating output;
•
combustion head set as on page 24.
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 18) with maximum
opening: 90°.
To calculate the approximate output at which the burner oper-
ates:
–
subtract the pressure in combustion chamber from the gas
pressure measured at test point 1)(Fig. 18).
–
Find, in Tab. H related to the burner concerned, the pressure
value closest to the result of the subtraction.
–
Read off the corresponding output on the left.
Installation
3
3
(8.2 Mcal/Sm
);
3
3
(7.0 Mcal/Sm
).
21
GB
1
20172189
2
1 p (mbar)
kW
G 20
1245
7.8
1500
9.4
1750
10.9
2000
12.4
2250
13.0
2500
13.7
2750
14.3
3000
15.0
3250
17.6
3500
20.2
3800
23.3
1800
5.4
2000
6.9
2250
8.8
2500
10.7
2750
12.5
3000
14.4
3250
15.6
3500
16.7
3750
18.2
4000
20.1
4300
22.5
1245
7.8
1500
9.4
1750
10.9
2000
12.4
2250
13.0
2500
13.7
2750
14.3
3000
15.0
3250
17.6
3500
20.2
3800
23.3
The data of thermal output and combustion
head gas pressure are related to full open (90°)
gas butterfly valve.
WARNING
Fig. 18
2 p (mbar)
G 25
G 20
G 25
11.6
1.3
2.0
13.9
1.9
2.8
16.2
2.6
3.9
18.5
3.4
5.0
19.5
4.3
6.4
20.4
5.3
7.9
21.4
6.4
9.5
22.4
7.6
11.3
26.2
8.9
13.3
30.1
10.3
15.4
34.8
12.2
18.2
6.7
2.8
4.2
9.0
3.5
5.2
11.9
4.4
6.5
14.8
5.4
8.1
17.7
6.5
9.8
20.6
7.8
11.6
22.7
9.1
13.6
24.8
10.6
15.8
27.2
12.2
18.2
30.0
13.8
20.7
33.5
16.0
23.9
11.6
1.3
2.0
13.9
1.9
2.8
16.2
2.6
3.9
18.5
3.4
5.0
19.5
4.3
6.4
20.4
5.3
7.9
21.4
6.4
9.5
22.4
7.6
11.3
26.2
8.9
13.3
30.1
10.3
15.4
34.8
12.2
18.2
Tab. H
20169009
Advertisement
Chapters
Table of Contents
