Manual Karcher HDC 20-16 H (page 19 of 384) (All languages)

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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

suction side of the pump by the overflow

valve. If all consumer loads have been

switched off, the overflow valve will switch

to circulation. If the pressure at the output

exceeds the maximum operating pressure

at the output, the safety valve will open.

– The appliance will be switched to

READY mode by activating the release

switch. The indicator lamp for opera-

tional readiness lights up. If the pres-

sure in the systems sinks below the de-

termined switch-on point due to the

opening of a hand spray gun, the high-

pressure pump will be switched on.

– If the flow switch in the high-pressure

line trips after closing all hand spray

guns while the pump is running, the

pump is switched off again with a delay

of 10 seconds (HDC 20/8) or 30 sec-

onds (HDC 20/16).

– If the system is ready and the high-

pressure is not turned on, a timer is

started, which will reset the readiness of

the unit after 6 hours. The operation

readiness indicator lamp goes off.

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 pump 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 protection contact in the motor

winding of the pump drive switches off the

engine when there is a thermal overload.

– 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 the hand spray gun is closed, the

overflow valve opens and the entire wa-

ter volume will flow back to the pump

suction side.

– If the hand spray gun is closed, the

pump is switched off via the flow switch

after a stopping time of 10 seconds

(HDC 20/8) or 30 seconds (HDC 20/16).

If the hand spray gun is opened again, the

pressure switch switches on the pump via

the pressure sensor.

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 flow switch

Pressure sensor

19EN

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Karcher HDC 20-16 H Manual

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