20093868
24
GB
Installation
4.8
Fuel supply
The burners are teamed with one-piece pneumatic proportioning
gas valves, via which the amount of gas delivered, and hence the
output produced, can be modulated.
A signal reporting pressure detected in the air circuit is carried to
the pneumatic gas valve, which delivers an amount of gas in pro-
portion to the airflow produced by the fan.
Air/gas mixer
Gas and combustive air are mixed inside the purging circuit (mix-
er), starting from the intake inlet.
Through the gas train, fuel is introduced into the intake air current
and optimal mixing commences with the aid of a mixer.
Key (Fig. 21)
1
Gas valve
2
Quick coupling
3
Compensation pipe (T)
4
Air/gas mixer in the circuit of the suction line
5
Electronic valve connection (XV1)
6
Maximum gas flow adjustment (V1)
7
Downstream pressure test point (P2)
8
Minimum gas flow adjustment (V2)
9
Metallic protective device
10 Upstream pressure test point (P1)
Explosion danger due to fuel leaks in the presence
of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure the fuel interception tap is closed before
performing any operation on the burner.
WARNING
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
Put a suitable support on the boiler / generator or on
the ground to support the valve so as to avoid the
weight resting on the mixer of the burner.
WARNING
Pipe (T) between valve-Venturi allows compensa-
tion to occur for accidental occlusion of the suction
line due to a reduction in gas delivered.
20093839
4
Fig. 21
1
3
3
7
6
2
5
8
9
10
