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4.11 Gas train
4.11.1 Gas feeding line
Explosion danger due to fuel leaks in the presence
of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure that the fuel interception tap is closed
before performing any operation on the burner.
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
It must be type-approved according to required standards and is
supplied separately from the burner.
8
D10946
4.11.2 Gas pressure
The pressure at the head of the burner from Tab. I
refers to zero in the combustion chamber; to obtain
true pressure, measured by a U-type manometer,
WARNING
add the counter-pressure of the boiler.
NOTE:
See the accompanying instructions for the adjustment of the
gas train.
20049577
10
9
Vent
6
3
11
5
4
Installation
Key to lay-out (Fig. 16)
1
Gas input pipe for main burner
2
Manual valve
3
Low gas pressure switch
4
Safety shut-off valve
5
NO vent valve
6
Regulating shut off valve
7
Gas input pipe for pilot
8
Gas adjustment butterfly valve
9
Burner
10 High gas pressure switch
11 Manual valve (for seal control)
12 Pilot regulator
12
4
5
4
2
Vent
M ai n
1
gas suppl y
2
GCV
MBtu/hr
13254
15148
18935
22723
26510
30297
30676
20
GB
Pi l ot
7
gas suppl y
Combustion Head
Gas butterfly +
"WC
Adaptor "WC
3.5
4.8
7.4
10.1
13.8
17.6
17.9
Fig. 16
0.2
0.2
0.4
0.5
0.7
0.9
0.9
Tab. I
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