Proper Use; Function; Safety Devices - Kärcher HDS 9/14-4 ST Manual Original

Personal safety gear
Wear ear plugs to protect your ears against
hearing loss while cleaning parts that produce
high sound levels.
– Wear protective clothing and safety goggles to protect against
splash back containing water or dirt.

Proper use

The machine is used for removing dirt from surfaces using a free-
flowing water jet. It is mainly used for cleaning machines, vehicles
and facades.
DANGER
Risk of injury! Follow the respective safety regulations upon em-
ployment at gas stations or other dangerous areas.
Please do not let mineral oil contaminated waste water reach
soil, water or the sewage system. Perform engine cleaning and
bottom cleaning therefore only on specified places with an oil
trap.
Quality requirements for water:
ATTENTION
Only clean water may be used as high pressure medium. Impuri-
ties will lead to increased wear and tear or formation of deposits
in the appliance and accessories.
If recycled water is used, the following limit values must not be
exceeded.
pH value
electrical conductivity *
settleable solids **
total suspended solids ***
Hydrocarbons
Chloride
Sulphate
Calcium
Total hardness
Iron
Manganese
Copper
Active chloride
free of bad odours
* Maximum total 2000 µS/cm
** Test volume 1 l, settling time 30 min
*** no abrasive substances
6,5...9,5
Conductivity fresh water
+1200 µS/cm
< 0,5 mg/l
< 50 mg/l
< 20 mg/l
< 300 mg/l
< 240 mg/l
< 200 mg/l
< 28 °dH
< 50 °TH
< 500 ppm (mg CaCO /l)
3
< 0,5 mg/l
< 0,05 mg/l
< 2 mg/l
< 0,3 mg/l
EN
– Cold water reaches the suction side of the high pressure
pump via the engine cooling coil and the swimmer tank. The
water softening agent is added in the swimmer tank. The
pump transports the water and the sucked detergent through
the continuous heater. The proportion of detergent in the wa-
ter can be adjusted using the dosing valve. The continuous
heater is heated by a heater.
– The high pressure outlet is connected to a high pressure net-
work existing in the building. The hand-spray gun is connect-
ed to the feeder points of this network using a high pressure
hose.

Safety Devices

Safety devices serve for the protection of the user and must not
be put out of operation or bypassed with respect to their function.
Safety mechanism against lack of water in swimmer
The safety mechanism against lack of water prevents the high
pressure pump from being switched on when there is no water.
Safety mechanism against lack of water in safety
The safety mechanism against lack of water prevents the heater
from over-heating when there is no water. The burner operates
only when there is adequate water supply.
Pressure switch
The pressure switch switches off the machine when the working
pressure is exceeded. Do not change the setting.
The safety valve opens when there is a problem in the pressure
switch. This valve is set and sealed in the factory. Do not change
the setting.
Flame monitoring
In case of fuel shortage or problems with the burner, the flame
monitor switches off the burner. The indicator lamp Burner failure
(E) glows.
Over-current protection
If the burner engine is blocked, the switch for protection against
over-current gets released. The engine of the high pressure
pump is protected through an engine protection switch and a
winding protection switch.
Exhaust thermostat
The exhaust thermostat is triggered when the exhaust tempera-
ture exceeds 300 °C. The appliance is switched off.
Pressure release in the high pressure system
When the machine is switched off using the hand-spray gun, a
solenoid valve installed in the high pressure system opens when
the operations stand-by time has elapsed; this causes the pres-
sure to fall.
The safety catch on the trigger gun prevents the appliance from
being switched on unintentionally.
2
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Function

tank
block
Safety valve
Safety catch
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