Riello DB 9 SE C03 FGR FS1 FB A0 Installation, Use And Maintenance Instructions page 35

5.3 Air/fuel control and power modulation system
General information
The burner system for air/fuel adjustment and power modulation performs - in one single control device - a series of integrated
functions to obtain optimal energy/operating efficiency from the burner, both for single operation and when combined with other
units (e.g. double furnace boiler or several generators working in parallel).
The basic system functions control:
1. the dosage of air and fuel, using a direct servocommand to position the relative valves; this eliminates the play that is possible
in those calibration systems with leverages and a mechanical cam (used on traditional modulating burners);
2. the modulation of burner output, on the basis of the load requested by the system, maintaining the pressure or temperature of
the boiler at the working values set;
3. the fine, continuous adjustment of the air flow rate according to the gas analysis made at the flue (O
the O kit, containing the PLL module and the QGO
2
4. the measurement of the combustion yield (this function requires the O
5. the sequence (cascade adjustment) of several boilers, suitably connected.
Further interfaces and communication functions with computers, for remote control or integration in central supervision systems
are available on the basis of the configuration of the system.
NOTE
The first start-up, and every further internal setting of the adjustment system or expansion of the standard functions, re-
quires access via a password and is to be carried out by service personnel specially trained for the internal programming
of the instrument and the specific application created with this burner.
The specific reference manual for the instrument is supplied during training to provide technical assistance.
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CHAPTER
sensor;
2
kit);
2
Preparation for start up
); this function requires
2
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