8
FUEL SUPPLY
The burners are teamed with one-piece pneu-
matic 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.
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.
Note
The pipe (T) between Venturi-valve, accidental
blocking of the intake can be compensated by
reducing the amount of gas delivered.
After connecting the compensation pipe (T),
with the valve coat it with a rubber protection.
GAS TRAIN (B)
Approved, together with the burner, according to
the regulation EN 676, and supplied.
LEGENDA (B)
1 - Gas input pipe
2 - Manual valve
3 - Vibration damping joint
4 - Pressure gauge with pushbutton cock
5 - Valve, including:
- filter (replaceable)
- working valve
- pressure adjuster
P1 - Pressure up-line from the filter
P2 - Downstream pressure of valve
L - Gas train supplied
L1 - The responsibility of the installer
(A)
D7803
Gas valve
Compensation pipe (T)
Metal protection
Wiring loom fitting
Compensation pipe (T)
Maximum flow adjustment (V1)
Downstream pressure test point (P2)
+
-
+
-
Air/gas mixer
(Venturi)
in the suction
circuit
Gas
pressure
test point
upline (P1)
Minimum gas flow
adjustment on the stabiliser (V2)
D8668
(B)
L1
L
VS
VR
R
F
1
2
3
4
5
P2
P1
