Safety Devices - Kärcher HDC 40/8 Manual Original

Water inlet
The water flows back from the swimmer
tank to the suction side of the pump. The
water level in the swimmer tank is kept con-
stant by the swimmer valve. In case of fail-
ure of the swimmer valve, the water exits
via the overflow. If the water supply is dis-
turbed, the lack of water fuse will send an
error message to the controls.
Pumps
The electric engine will drive the crankshaft
pump. The pump transports the water un-
der high pressure to the pressure side.
High pressure side
The high-pressure water reaches the high-
pressure output via the overflow valve and
the pressure sensor. After that, there will be
the high-pressure network of the operator.
Pressure regulation
Remaining water will be routed back to the
floater basin by the overflow valve. If all
consumer loads have been switched off,
the overflow valve will completely switch to
backflow to the floater basin. If the pressure
at the output exceeds the maximum operat-
ing pressure at the output, the safety valves
will open.
Controls
– The appliance will be switched to
READY mode by activating the release
switch. If the pressure in the systems
sinks below the determined switch-on
point due to the opening of a hand
spray gun, the high-pressure pumps will
be switched on.
– If the flow switch at the overflow valve is
triggered while the high-pressure
pumps are running after closing all
hand sprayguns, the pump is switched
off once again with a 30 second delay.
– If the system is ready and the high-
pressure pumps are not turned on, a
timer is started, which will reset the
readiness of the unit after 6 hours.

Safety Devices

Safety devices serve for the protection of
the user and must not be put out of opera-
tion or bypassed with respect to their func-
tion.
Safety mechanism against lack of
water in swimmer tank
The safety mechanism against lack of wa-
ter prevents the high pressure pumps from
being switched on when there is no water.
Temperature sensor
The temperature sensor switches off the
appliance as soon as the water tempera-
ture is too high.
Winding protection contact
The winding protection contact in the motor
winding of the pump drive switches off the
engine when there is a thermal overload.
Safety valve
– The safety valve opens when the over-
flow valve is defective.
– The safety valve is set by the manufac-
turer and sealed. Setting only by cus-
tomer service.
Overflow valve with flow switch
– If all hand spray guns are closed, the
overflow valve opens and the entire wa-
ter volume will flow back into the floater
basin. The high pressure pumps are
switched off via the flow switch once the
set delay time has elapsed.
– The remaining water flows back into the
floater basin via the overflow valve.
Pressure sensor for high pressure
If the hand spray gun is opened again, the
high pressure pumps will restart via the
pressure sensor for high pressure.
3
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EN 19