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MODULATION OPERATION DESCRIPTION
When the burner is ignited at the minimum flow-rate, if the
modulation probe allows it (adjusted to a temperature or pressure
which is greater than that present in the boiler) the air adjustment
servomotor begins to operate,
•
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.
As temperature or pressure drops below the control device set-
point, the burner is started again as described above.
causing a gradual increase in the combustion air and fuel flow,
until it reaches the maximum flow setting of the burner.
The burner remains in the maximum flow position until the
temperature or pressure is high enough to trip the modulation
probe, which reverses the rotation of the air adjustment servomotor.
Reverse rotation of the servomotor and consequently a reduction
in gas and air flow take place in short time intervals.
With this procedure, the modulation system attempts to balance
the amount of heat supplied to the boiler with respect to the
amount the boiler releases for use.
The modulation probe installed on the boiler measures any request
variation and automatically adjusts fuel and combustion air supply,
by starting the air/gas adjustment servomotor and increasing or
reducing rotation as necessary.
If the threshold value (temperature or pressure), to which the
complete shut-down device (thermostat or pressure switch) is set,
is reached even with minimum gas and air output, the burner will
be shut down when the device is triggered.
When temperature or pressure returns below the shut-down
device tripping value, the burner is activated once again according
to the program described in the previous section.
Summary of Contents for TBML 200 MC
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