3425
5
GB
3.5
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.
To optimise the bulk, the gas train is assembled directly on the body of the burner and is pre-set in the factory.
Maximum gas flow
adjustment (
V1
)
Gas pressure upline
test point (
P1
)
GAS TRAIN ASSEMBLY
D7376
D7155
Air/gas mixer
Gas and combustive air are mixed
inside the purging circuit (mixer),
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.
Gas valve
Valve model
Honeywell VK4115V 1014
Mixer model
45900446-055
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 + C
Electrical supply
220-240 V
IP
IP 40 according to IEC 529
Flange
Gas supply
Gas valve
D8425
Gas pressure downline
test point (
P2
)
Minimum gas flow adjustment
on the stabiliser (
V2
)
