23
20138630
GB
Installation
5.7
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 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.
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.
WARNING
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
DANGER
Disconnect the electrical power using the main
switch.
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.
WARNING
Refer to the accompanying instructions for the ad-
justment of the gas train.
The operator must use appropriate tools for instal-
lation.
Fig. 17
Gas valve
Metallic protective device
Air/gas mixer
in the circuit
of the suction line
Minimum gas flow adjustment (V2)
20075337
Valve connection
Minimum gas
Compensation pipe (T)
electronic (XV1)
Quick Coupling
Compensation pipe (T)
gas flow adjustment (V1)
Downstream pressure test point
