22
DOMITOP HF 24 - 30 E
FERELLA GOLD HF 24 - 30 MEL
Version - 09.2002
Burner assembly
The burner assembly is composed of 12 or 16 burner stages. Each stage is composed of two pressed steel
half bearings, with a suitably cut stainless steel head. Gas enters at the bottom of the stage. Thanks to the
special Venturi-tube shape of the bottom portion of the stage, the gas injected by the nozzle carries with
it the primary air needed for combustion. The air-gas mixture thus formed inside the stage is evenly
distributed on the burner head. Combustion takes place homogeneously over the entire length of the single
stages, with the contribution of the secondary air from the bottom of the burner mount and from the
combustion chamber itself. The set of stages in operation forms a single belt of flame, light blue in colour,
whose size varies according to the nozzle gas pressure, that is the boiler capacity modulation.
Detection electrode
Made of the same material as the ignition electrode, it is set 11 mm from
the burner head. Combustion causes the flame atmosphere to ionize,
making it conductive. Thanks to the mass of the burner, making a suitable
potential with the electrode produces a flow of direct current on it. For our
cards, it is necessary to have an ionizing current of at least 0.5 µA to detect
a flame. A mean signal is normally obtained of approximately 2 µA.
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