Fuel Supply - Riello RX 500 S/PV Modulating Operation

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 the fuel interception tap is closed be-
fore performing any operation on the burner.
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
Disconnect the electrical power using the main
switch.
DANGER
Make sure that there are no gas leaks.
Pay attention when handling the train: danger of
crushing of limbs.
Make sure that the gas train is properly installed
by checking for any fuel leaks.
Valve connection
electronic (XV1)
Minimum gas flow adjustment (V2)
Installation
Gas valve
Quick Coupling
Minimum gas
gas flow adjustment (V1)
Metallic protective device
23
Refer to the accompanying instructions for the ad-
justment of the gas train.
WARNING
The operator must use appropriate tools for instal-
lation.
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 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.
Downstream pressure test point
20075337
GB
Air/gas mixer
in the circuit
of the suction line
Compensation pipe (T)
Compensation pipe (T)
Fig. 17
20138630