Burner Blower With Fuel Pump - Kärcher HDS 5/11 U Service Manual

5.5 Burner blower with fuel pump

1 Air guidance to the on-demand heater
2 Slider, air volume adjustment
3 Stop screw, air volume adjustment
4 Return to fuel tank
5 Fuel hose supply to the fuel pump
6 Connecting cable of solenoid valve and fuel pump
7 Access opening of fuel pressure adjustment
8 Fuel pump
9 Suction opening, burner blower
10 Fuel filter
11 Fuel line from fuel pump to burner
12 Fuel hose supply to the fuel filter
13 Fuel tank
Fuel pump
The fuel pump is connected directly to the motor shaft
via the coupling piece and the blower wheel. It also
feeds fuel from the tank and back via the return dur-
ing cold water operation. This lubricates the toothed
wheel pump.
During warm water operation, the installed solenoid
valve and part of the fuel reaches the burner through
the fuel nozzle and is ignited there.
The fuel pressure is adjusted via the central setting
screw.
During dry runs, the fuel pump will block.
The coupling piece serves as a nominal breaking
point.
14
English 5.906-487.0 Rev. 00 (04/10)
1 Cable connections for fuel solenoid valve
2 Safety clip
3 Fuel filter
4 Fuel hose
5 Supply
6 Fuel solenoid valve 230 V
7 Adjustment screw for fuel pressure
8 Fuel line to burner nozzle
9 Return to fuel tank
10 Fuel hose
11 Screw connection of fuel line