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Head size 5
(G31) holes 1.5 mm
kW
1
2
3970600 3970256 3970262 3970263
mbar
mbar
150
1.6
0.05
300
5.3
0.1
400
9.0
0.3
450
11.3
0.37
500
13.8
0.46
550
16.5
0.57
600
19.5
0.68
650
22.7
0.82
700
26.1
1
720
27.6
1
(G20) holes 2.0 mm
kW
1
2
3970600 3970256 3970262 3970263
mbar
mbar
150
1.4
0.2
300
4.5
0.4
400
7.5
0.7
450
9.4
0.9
500
11.4
1.1
550
13.6
1.4
600
16.0
1.6
650
18.6
2.0
700
21.4
2.3
720
22.6
2.4
Head size 6
(G31) holes 1.5 mm
kW
1
2
3970600 3970256
mbar
mbar
150
1.1
0.1
300
3.5
0.1
400
5.9
0.3
450
7.4
0.4
500
9.0
0.5
550
10.8
0.6
600
12.7
0.7
650
14.8
0.8
700
17.0
1.0
750
19.4
1.2
800
22.0
1.3
900
27.6
1.7
(G20) holes 2.0 mm
kW
1
2
3970600 3970256
mbar
mbar
150
1.0
0.2
300
3.0
0.4
400
5.0
0.7
450
6.2
0.9
500
7.6
1.1
550
9.0
1.4
600
10.6
1.6
650
12.3
2.0
700
14.1
2.3
750
16.0
2.6
800
18.1
3.4
900
22.6
3.7
(A)
p (mbar)
3
1"
1 1/4"
1 1/2"
4÷50
4÷50
4÷33
3.1
1.6
\
9.1
4.5
2.4
14.7
7.1
3.5
18.1
8.7
4.0
21.7
10.3
4.6
25.7
12.1
5.2
\
14.0
5.8
16.1
6.5
18.3
7.1
19.2
7.4
3
1"
1 1/4"
1 1/2"
4÷50
4÷50
4÷33
6.7
3.6
2.4
19.7
9.9
5.3
32.0
15.5
7.5
\
18.8
8.7
\
22.4
10.0
\
26.3
11.3
\
30.5
12.6
\
35.0
14.0
\
39.7
15.5
\
41.7
16.1
p (mbar)
3
1"
1 1/4"
1 1/2"
3970262
4÷50
4÷50
4÷33
3.1
1.6
\
9.1
4.5
2.4
14.7
7.1
3.5
18.1
8.7
4.0
21.7
10.3
4.6
25.7
12.1
5.2
\
14.0
5.8
16.1
6.5
18.3
7.1
20.6
7.9
23.1
8.6
28.5
10.1
3
1"
1 1/4"
1 1/2"
3970262
4÷50
4÷50
4÷33
6.7
3.6
2.4
19.7
9.9
5.3
32.0
15.5
7.5
\
18.8
8.7
\
22.4
10.0
\
26.3
11.3
\
30.5
12.6
\
35.0
14.0
\
39.7
15.5
44.8
17.1
\
18.7
\
22.0
2"
1 1/2"
2"
3970250
3970257
4÷33
20÷50
20÷50
\
\
\
\
\
\
2.2
\
\
2.6
\
\
3.0
\
\
3.4
5.2
3.4
3.9
5.8
3.9
4.4
6.5
4.4
4.9
7.1
4.9
5.2
7.4
5.2
2"
1 1/2"
2"
3970250
3970257
4÷33
20÷50
20÷50
1.3
\
\
3.2
\
\
4.7
\
\
5.6
\
\
6.5
\
\
7.5
\
\
8.5
12.6
8.5
9.6
14.0
9.6
10.8
15.5
10.8
11.2
16.1
11.2
2"
1 1/2"
2"
3970263
3970250
3970257
4÷33
20÷50
20÷50
\
\
\
\
\
\
2.2
\
\
2.6
\
\
3.0
\
\
3.4
\
\
3.9
\
\
4.4
\
\
4.9
7.1
4.9
5.5
7.9
5.5
6.1
8.6
6.1
7.4
10.1
7.4
2"
1 1/2"
2"
3970263
3970250
3970257
4÷33
20÷50
20÷50
1.3
\
\
3.2
\
\
4.7
\
\
5.6
\
\
6.5
\
\
7.5
\
\
8.5
\
\
9.6
\
\
10.8
\
\
12.0
\
\
13.3
18.7
13.3
16.0
22.0
16.0
12
P
These data are referred to the codes
of the head assembly (B)
GAS PRESSURE
The adjacent tables (A) show minimum pres-
sure losses along the gas supply line depending
on the maximum burner output operation.
Column 1
Combustion head load loss. See 30)(A)p.4.
(*) Combustion head load loss with standard
gas nozzles Ø = 2mm. See 30)(A)p.4.
Column 2
Load loss at gas butterfly valve with maximum
opening: 90°.
Column 3
Load loss at gas train including: adjustment
valve VR, safety valve VS (both fully open),
pressure adjuster R, filter F.
The values shown in the various tables refer to:
natural gas G 20 PCS 11.1 kWh/Nm
3
PCS 28.1 kWh/Nm
With:
natural gas G 25 multiply the values of the tables
by 1.3 for G 20.
Calculate the approximate maximum output of
the burner in this way:
-
subtract the combustion chamber pressure
from the gas pressure measured at test point
3)(A)p.5.
-
Find the nearest pressure value to your
result in column 1 of the table for the
required burner.
-
Read off the corresponding output on the left.
To calculate the required gas pressure at test
point 3)(A)p.5, set the MAX output required from
the burner operation:
-
find the nearest output value in the table for
the burner in question.
-
Read off the pressure at test point 3)(A)p.5
on the left in column 1.
-
Add this value to the estimated pressure in
the combustion chamber.
GAS FEEDING LINE
• The gas train is connected to the gas attach-
ment, by means of the elbow fixed to the cou-
pling 8)(A)p.4.
Make sure that the calibration range of the pres-
sure adjuster included the pressure needed for
the burner (in models with different springs, refer
to their colour to change the calibrations).
The data of thermal output and
combustion head gas pressure
are related to full open (90°) gas
butterfly valve.
3
or G 31
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