Kärcher HDS 7/12 M, Service Manual

Page: 111 / 131

English 5.906-432.0 Rev. 00 (06/15)
111
1 Pressure line to the burner
2 Fuel pump
3 Suction hose, fuel
4 Adjustment screw, fuel pressure
5 Return hose to the fuel tank
Measure water temperature

Install the shut-off valve with thermometer (special tool)
on the appliance outlet.

Switch on the burner and bring the appliance to working
pressure with full water volume via the shut-off valve.

Let the device run in burner operation for approx. 5 min-
utes until the maximum water temperature is reached.

Measure the increase in water temperature (water out-
let temperature minus water supply flow temperature).

For target values refer to technical specifications.

Measure the soot value, CO2 content and the exhaust
temperature (special tools, measuring gauges).
1 Air door, air volume adjustment
2 Stop screw
Adjusting the fuel pressure

Set the fuel pressure (and water temperature) via the
set screw.

For target values refer to technical specifications.
Adjusting the soot value

If the soot value is too high, then the air flap needs to
be opened further or the fuel pressure needs to be re-
duced.
Adjust the CO
2
value

Adjust the CO
2
value by moving the air flap. Open the
air flap, the CO
2
content is decreasing.
Note
An accurate basic adjustment of the burner is only possible
if the heating coil was previously thoroughly desooted and
the deposits were removed.Eine exakte Grundeinstellung
des Brenners ist nur möglich, wenn die Heizschlange vor-
her gründlich entrußt und die inneren Ablagerungen en-
tfernt wurden.
Note
After finishing the basic adjustment, the fuel pump and the
air flap must be sealed.
7.47 Settings, burner