Karcher HDS 7-12-4 M - Manual (Page 32)

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 Set thermostat to max. 98 °C.
 Set the operating pressure on the pump
unit to the maximum value.
 Set the working pressure and feed
quantity by turning (steplessly) the
pressure/quantity regulation mecha-
nism at the hand spray gun (+/-).
ƽ
Danger
When adjusting the pressure/quantity regu-
lation, make sure that the screw connection
of the spray lance does not become loose.
Note: For long term work with low pres-
sure, set pressure at the pump unit.
– For considerate treatment of the envi-
ronment use detergent economically.
– The detergent must be suitable for the
surface to be cleaned.
 With support of the detergent dose
valve set detergent concentration as
determined by the manufacturer.
Note: Recommended values at the control
panel at maximum working pressure.
 Set pressure/temperature and deter-
gent concentration according to the sur-
face to be cleaned.
Note: To prevent damage due to too much
pressure, always position high pressure ray
first from a greater distance towards object
to be cleaned.
– Loosen the dirt:
 Spray detergent economically and let it
work for 1...5 minutes but do not let it
dry up.
– Remove the dirt:
 Spray off loosened dirt with the high
pressure jet.
Removal of light contaminations and clear
rinse, i.e.: Gardening tools, terrace, tools,
etc.

Set operating pressure according to
need.
The appliance works in the most economi-
cal temperature range.
Note: The temperature can be regulated
up to 60 °C.
We recommend the following cleaning tem-
peratures:
– Light contaminations
30-50 °C
– Contaminations containing protein, i.e.
in the food processing industry
max. 60 °C
– Vehicle cleaning, machine cleaning
60-90 °C
– De-preserve, contaminations contain-
ing strong fat contents
100-110 °C
– De-frosting of surcharge substances,
partially facade cleaning
up to 140 °C
ƽ
Danger
Scalding danger!

Set temperature regulator to desired
temperature.
ƽ
Danger
Scalding danger! The operating pressure
must not exceed 3,2 MPa (32 bar) when
operating with temperatures above 98 °C.
Therefore the following measures must
definitely be performed:
Pressure/ quantity regulation at the
hand spray gun
Operation with detergent
Cleaning
Recommended cleaning method
Operating with cold water
Eco operation
Operating with hot water/steam
Operating with hot water
Operating with steam
32 EN