HDS Middle Range / HDS Premium Range
Unit Function
Service Manual 04.2008
Page 49 / 127
2.20 Burner
1 Ignition electrodes
2 Burner cover
3 Fuel nozzle
4 Spraying angle 45° or 60 °, depending on
the unit type
5 Retaining screw, ignition electrodes
Ignition electrodes
A strong ignition spark is formed between the
two ignition electrodes (1) ensuring that the
injected fuel is safely and reliably ignited.
The necessary ignition voltage is generated by
the ignition transformer.
Exact compliance with the reference dimensions
is the basic requirement for proper burner
function, good emission values and long tool life
of the ignition electrodes.
An ignition spark is always generated between
the two ignition electrodes during hot and cold
water operation (continuous ignition). This is a
safety measure to ensure that injected fuel is
always ignited and cannot collect, unburned, in
the continuous flow heater (risk of deflagration).
1
2
3
1
5
4
5.0 mm +/- 0.5
3.5 mm +/- 0.5
3.0 mm +/- 0.5