Fuel Supply - Riello RX 400 S/PV Installation, Use And Maintenance Instructions

5.7

Fuel supply

Explosion danger due to fuel leaks in the pres-
ence of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure that the fuel interception tap is closed
before performing any operation on the burner.
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
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
Upstream
gas pressure
test point (P1)
Compensation pipe (T)
5.7.1 Gas train
This has been type-approved together with the burner, in accord-
ance with regulation EN 676, and is supplied as standard (Fig.
11).
Key (Fig. 11)
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 upline the filter
P2 Downstream pressure of valve
L - Gas train supplied
L1 - The responsibility of the installer
Installation
Gas valve
+
-
+
-
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adjustment on the stabiliser (V2)
12
the pneumatic gas valve, which delivers an amount of gas in pro-
portion to the airflow produced by the fan.
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.
NOTE:
Pipe (T) between valve-Venturi allows compensation to oc-
cur for accidental occlusion of the suction line due to a re-
duction in gas delivered. After having connected the
compensation pipe (T) with the valve, cover it again with the
rubber protective device.
Adjustment of maximum gas flow (V1)
Downstream pressure test point (P2)
Compensation pipe (T)
Fair lead
Metallic protective device
Minimum gas flow
4
F
1 2 3
P1
L1
GB
Air/gas mixer
(Venturi) in the
suction line circuit
5
V S R V R
P2
L
Fig. 10
Fig. 11
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