3350
7
GB
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 assembled directly onto the burner body.
GAS TRAIN ASSEMBLY
D7375
D7155
D7380
Note:
With the valve/manifold connection, accidental blocking of the intake can be compensated by
reducing the amount of gas delivered.
Air/gas mixer
Gas and combustive air are mixed in-
side the purging circuit (mixer), start-
ing from the intake inlet.
Through the gas train, fuel is intro-
duced into the intake air current and
optimal mixing commences with the
aid of a mixer.
Gas valve
Valve model
Honeywell VK4125V 10054
Mixer model
Honeywell 45.900.44-001
Gas line connection
½" inlet
Working temperature
-15°C/70°C
Max. working pressure
30 mbar
Min. working pressure
15 mbar
Max. inlet pressure
60 mbar
Valve class
B + B
Electrical supply
220-240 V
Protection level
IP 40 according to IEC 529
Air/gas mixer
in the suction circuit
Gas supply
Gas pressure upline
test point (
P1
)
Gas pressure downline
test point (
P2
)
Flange
Gas valve
Maximum gas flow
Minimum gas flow adjustment
on the stabiliser (
V2
)
D7376
Gas compensation pipe
adjustment (
V1
)