Burner Assembly; Detection Electrode - Ferroli Domina F 24-30 E Technical Manual

DOMINA F 24 - 30 E
FERELLA F 24 - 30 MEL
MILOS AIR COMPACT E

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.

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.
Version - 09.2002
22
Supplied By www.heating spares.co Tel. 0161 620 6677