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Karcher HDS 12-14-4 ST Gas Manual

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The work station is located at the operating field. Depending on
the plant installation, other work-stations are located at the ac-
cessories (spraying units) that are connected to the feeder
points.
–Wear protective clothing and safety goggles to protect against
splash back containing water or dirt.
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.
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.
– Cold water reaches the swimmer tank via the engine cooling
hose and from there it reaches the outer jacket of the contin-
uous heater and then the suction side of the high pressure
pump. The water softening agent is added in the swimmer
tank. The pump transports the water and the sucked deter-
gent through the continuous heater. The proportion of deter-
gent in the water can be adjusted using the dosing valve. The
continuous heater is heated by a gas 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 serve for the protection of the user and must not
be put out of operation or bypassed with respect to their function.
The safety mechanism against lack of water prevents the high
pressure pump from being switched on when there is no water.
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.
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.
In case of fuel shortage or problems with the burner, the flame
monitor switches off the burner. The indicator lamp Burner failure
(E) glows.
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.
The exhaust thermostat is triggered when the exhaust tempera-
ture exceeds 320 °C. The indicator lamp exhaust gas thermostat
(K) glows.
The maximum temperature controller in the boiler floor (> 80 °C)
and the water outlet (> 110 °C) will get triggered and the indicator
lamp for boiler interruption (E) will glow.
The exhaust pressure switch will switch off the burner when the
exhaust gas system has reached abnormally high counter-pres-
sure levels, for e.g. when there is a blockade.
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.
Work-stations
Personal safety gear
Wear ear plugs to protect your ears against
hearing loss while cleaning parts that produce
high sound levels.
Proper use
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.
pH value 6,5...9,5
electrical conductivity * Conductivity fresh water
+1200 µS/cm
settleable solids ** < 0,5 mg/l
total suspended solids *** < 50 mg/l
Hydrocarbons < 20 mg/l
Chloride < 300 mg/l
Sulphate < 240 mg/l
Calcium < 200 mg/l
Total hardness < 28 °dH
< 50 °TH
< 500 ppm (mg CaCO3/l)
Iron < 0,5 mg/l
Manganese < 0,05 mg/l
Copper < 2 mg/l
Active chloride < 0,3 mg/l
free of bad odours
* Maximum total 2000 µS/cm
** Test volume 1 l, settling time 30 min
*** no abrasive substances
Function
Safety Devices
Safety mechanism against lack of water in swimmer
tank
Safety mechanism against lack of water in safety
block
Pressure switch
Safety valve
Flame monitoring
Over-current protection
Exhaust thermostat
Temperature controller
Exhaust pressure switch
Pressure release in the high pressure system
Safety catch
24 EN
… 24 …


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