Karcher HDC advanced - Manual (Page 18)

18 English
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.
The electric engine will drive the crankshaft
pump. The pump transports the water un-
der high pressure to the 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.
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.
– 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.
The first pump is switched on via the fre-
quence inverter, all remaining pumps
are operated directly via the mains.
– If the flowmeter 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-pres-
sure pumps are not turned on, a timer is
started, which will reset the readiness of
the unit when the preset time has
elapsed.
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.
The safety mechanism against lack of wa-
ter prevents the high pressure pumps from
being switched on when there is no water.
The temperature sensor switches off the
appliance as soon as the water tempera-
ture is too high.
The winding proctection contact in the mo-
tor winding of the pump drive switches off
the engine when there is a thermal over-
load.
– 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.
– 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 flowmeter once the
set delay time has elapsed.
– The remaining water flows back into the
floater basin via the overflow valve.
If the hand spray gun is opened again, the
high pressure pumps will restart via the
pressure sensor for high pressure.
Water inlet
Pumps
High pressure side
Pressure regulation
Controls
Safety Devices
Safety mechanism against lack of
water in swimmer tank
Temperature sensor
Winding protection contact
Safety valve
Overflow valve with flowmeter
Pressure sensor for high pressure