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OPERATION DESCRIPTION WITH GASEOUS
FUEL
Closing the ON - OFF switch, if the thermostats are closed, the voltage
reaches the command and control equipment which starts operating.
The fan motor is thus switched on to carry out the preventilation of
the combustion chamber, at the same time the air damper control
servomotor moves to the opening position corresponding to the
maximum power setting.
At the end of the preventilation stage the air damper goes back to
the 1st flame position. If the air ventilation control pressure switch
has found that there is sufficient pressure, the ignition transformer will
come on, and two seconds later the safety and 1st flame gas valves
will open.
In particular:
• The main valve is a slow opening two-stage valve
• The safety valve is an ON/OFF valve
• The air damper is activated by a dedicated electric servomotor,
keep in mind that when the burner is locked out because the
thermostat is tripped, the servomotor returns the air damper to the
closed position.
The presence of the flame, detected by the control device, permits
continuation and completion of ignition, turning off the ignition
transformer.
Then the servomotor opens the air damper gradually and the gas
valve of the 2nd flame at the same time.
If there is no flame, the appliance shuts down in “safety lock-out”
mode within three seconds from the opening of the main valve. In
safety lock-out mode the valves are closed again immediately. To
release the equipment from this safety position, press the unlocking
button on the control panel.
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