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5.8
Fuel supply
Explosion danger due to fuel leaks in the pres-
ence of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure the fuel interception tap is closed be-
fore performing any operation on the burner.
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
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.
Gas valve
Pressure test point
test point (P1)
Compensation pipe (T)
Minimum gas flow
adjustment on the stabiliser (V2)
Installation
+
-
+
-
D7803
25
5.8.1
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.
The pipe (T)(Fig. 22) between valve-Venturi allows compensa-
tion to occur for accidental occlusion of the suction line due to a
reduction in gas delivered.
After having connected the compensation pipe (T)
with the valve, cover it again with the rubber pro-
tective device.
CAUTION
Adjustment of maximum gas flow (V1)
Downstream pressure test point (P2)
Compensation pipe (T)
Metallic protective device
GB
Air/gas mixer (Venturi)
in the suction line circuit
Fair lead
Fig. 22
20160576
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