OPERATING DESCRIPTION
When the boiler thermostat (TC) closes, the burner equipment is
enabled to begin the start-up cycle.
During this phase, the correct positioning of the pressure switch con-
tact will be checked and the pre-ventilation performed, which will take
place at the rpm set by the manufacturer.
This phase is essential to provide air volume inside the combustion
chamber so that there is no danger of accumulating explosive gases
during the ignition phase.
Once the pre-ventilation phase has ended, the equipment will bring the
fan to the number of revolutions set for ignition (P0), after which it will
activate the transformer and, nally, the gas valves will open.
The gas will reach the combustion head and the ame will appear.
Through the ionisation probe, the equipment will ensure that the burner
ignites within a set time, and that the ame is always present during the
entire burner operation.
Once the ignition phase is completed, the burner will set to the mini-
mum position (P1), after which the modulation signal sent to the equi-
pment by the PID controller will follow.
The modulation is based on variable speed technology. The combu-
stion air ow rate can be regulated by varying the motor speed (rpm)
and the use of a proportional gas valve allows, depending on the pres-
sure detected in the ventilation circuit, the correct amount of fuel to be
delivered.
The gas is mixed with the combustion air upstream of the ventilation
circuit thanks to the use of a venturi mixer on which the proportional
gas train is tted.
Then the supplied ow rate is adjusted by varying the motor's rotation
speed, which will be managed by the burner equipment.
ENGLISH
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0006160310_202001
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