Kärcher HDS 5/11 U Service Manual page 17

1 Ignition electrodes
2 Fuel nozzle
3 Boiler floor
4 Boiler input
5 Air supply from burner blower
6 Boiler exterior, double-walled
7 Heating coil spiral, exterior
8 Heating coil spiral, interior
9 Type plate of heating coil
10 Exhaust nozzle, on-demand heater
The water from the high pressure pump enters the in-
terior heating coil spiral, is heated while flowing
through and exits to the bottom from the heating coil
spiral.
The fuel is vaporised by the fuel nozzle and ignited by
the spark of the ignition electrodes.
The combustion air from the blower first flows
through the double-walled boiler exterior toward the
top, then it flows downward with the flame and is
emitted as exhaust through the exhaust stack toward
the top into the atmosphere.
English 5.906-487.0 Rev. 00 (04/10)
17