OPERATING DESCRIPTION
Blown air burners with electronic modulation may be used on hearths
under strong pressure or in a vacuum, according to the corresponding
operating curves.
They combine a very stable flame with total safety and high
performance.
The burner is fitted with an electronic cam controlled by a microprocessor
for intermittent operation, and for the control and monitoring of the
blown air gas burners.
The burner is fitted with a valve tightness control device. To better
understand the operation of the electronic cam, read the specific
instructions in the manual provided carefully.
The modulating operation allows the transition from the first stage
(minimum output) to the second stage (maximum output) and vice
versa. It is progressive in terms of both amount of combustion air let
in and amount of output fuel, continuously adjusting to the specific
system requirements.
Ignition is preceded by pre-ventilation of the combustion chamber.
The combustion chamber pre-ventilation stage takes place with the air
damper fully open.
At the end of pre-ventilation stage, the combustion air damper goes
back to ignition position.
If the air pressure switch has detected a sufficient pressure, the ignition
transformer activates at the end of the ventilation phase and after 3
seconds the safety and main valves open in sequence.
Gas reaches the combustion head, mixes with air supplied by the fan
and is ignited by the spark generated by the ignition electrode on the
flame disc. The gas output is regulated by the throttle valve.
Three seconds after the valves (main and safety) activate, the ignition
transformer switches off.
The presence of the flame is detected by the control device immersed
in the flame (ionisation probe).
The programmer relay moves past the lock-out position and takes the
air/gas flow rate regulation servomotors and inverter (if fitted) to the
minimum point.
If the modulation probe allows it (regulation at a temperature or
pressure value higher than the one present in the boiler), the equipment
controls the rotation of the air/gas flow rate regulation servomotors and
regulates the motor's RPM (if the inverter is fitted). This determines a
gradual increase of the power burned until you reach the maximum
output to which the burner has been set.
CAUTION / WARNINGS
The electronic cam controls the burner, activating the combustion
air, gas servomotor and the fan motor, if the inverter is fitted,
according to a curve that has ten points set (see curve regulation
table).
The burner remains in the maximum output position as long as the
temperature or pressure reaches a value sufficient enough to cause
the intervention of the probe that rotates the gas/air flow rate regulation
servomotors. This progressively reduces the gas, combustion air and
motor's RPM (if the inverter is fitted) to the minimum.
If the threshold value of temperature or pressure to which the control
device is set is reached, the burner will be shut down.
As temperature or pressure drops below the control device set-point,
the burner is started again as described above.
During normal operation, the modulation probe installed on the boiler
measures any variation in temperature or pressure and automatically
adjusts the fuel and combustion air flow rate through the relevant
servomotors.
•
in a clockwise direction the air flow increases;
•
anticlockwise rotation: the air flow decreases.
In this way the burner is able to optimise the request of heat to be
supplied to the boiler.
If the flame does not appear within 3 seconds after the gas valves have
opened, the control box goes into the lock-out condition (the burner
shuts down completely and the warning light turns on).
To “reset” the control box operation, press the reset button.
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