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5.7
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.
GAS TRAIN ASSEMBLY
Gas supply
Flange
D7376
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.
20037916
Gas pressure downline
test point (P2)
Gas pressure downline
test point (P1)
Gas valve
D7155
Installation
To optimise the bulk, the gas train is assembled directly on the
body of the burner.
5.7.1
Gas train assembly
The connection valve-manifold allows compensating the acci-
dental occlusion of the suction line through the distributed gas re-
duction.
D7375
5.7.2
Gas valve
Valve model
Mixer model
Gas line connection
Working temperature
Max. working pressure
Min. working pressure
Max. inlet pressure
Valve class
Electrical supply
Protection level
Tab. A
12
GB
Air/gas mixer
in the suction line circuit
Minimum gas flow
adjustment (V1)
Minimum gas flow
adjustment on the stabiliser (V2)
Gas compensation pipe
Honeywell VK4125V 2003 4
Honeywell 45.900.446-253B
1/2" inlet
-15°C/70°C
30 mbar
15 mbar
60 mbar
B + B
220-240 V
IP 40 according to IEC 529
D7380
Fig. 8
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