Fuel Supply; Gas Valve - Riello RX 120 S/PV Manuel D'entretien

3.4 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 proportion to the airflow produced by the fan.
The gas train, in order to render the dimensions efficent is assembledd directly onto the burner body.
GAS TRAIN ASSEMBLY
Gas supply
Gas pressure
test point
upline (P )
1
Note
With the valve/manifold connection, accidental blocking of
the intake can be compensated by reducing the amount of
gas delivered.

Gas valve

Valve model
Mixer model
Gas line connection
Working temperature
Max. working pressure
Min. working pressure
Max. inlet pressure
Valve class
Electrical supply
IP
Minimum gas flow
adjustment on the
stabiliser (V )
2
Gas valve
Manifold
Gas
compensation pipe
Honeywell VR4615VB1006
Honeywell 45900450-0201
3/4" inlet
0° 60°C
÷
30 mbar
15 mbar
60 mbar
B + C
220-240 V
IP 40 according to IEC 529
5 GB
Air/gas mixer
in the suction
circuit
D7452
Maximum flow
adjustment (V
Air/gas mixer
Gas and combustive air are mixed
inside the purging circuit (mixer),
s t a r t i n g f r o m t h e i n t a k e i n l e t .
Through the gas train, fuel is intro-
duced into the intake air current
and optimal mixing commences
with the aid of a mixer.
)
1
D7453
3328