Publicidad
V
11
10
9
1
Locking tap (onsite)
2
Temperature sensor
3
Water shortage safeguard
4
Float tank
5
Advance pressure pump
(HDC 20/8 H, HDC 20/16 H only)
6
Crankshaft pump
7
Safety valve
8
Electro motor
9
Manometer
10 Pressure sensor
11 Flow switch
12 Overflow valve
13 Swimmer valve
14 Locking tap (onsite)
A
Pipeline/high-pressure output DN 15
B
Water supply, DN 20
C
Water overflow, DN 20
Water inlet
The water flows back from the swimmer tank to the suc-
tion side of the pump. The water level in the swimmer
tank is kept constant by the swimmer valve. In case of
failure of the swimmer valve, the water exits via the
overflow. If the water supply is disturbed, the lack of wa-
ter fuse will send an error message to the controls.
Pumps
The electric engine will drive the crankshaft pump. The
pump transports the water under 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.
Function
Flow pattern
12
13
Pressure regulation
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.
Controls
–
The appliance will be switched to READY mode by
activating the release switch. The indicator lamp for
operational readiness lights up. 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 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 run-
ning, the pump is switched off again with a delay of
10 seconds (HDC 20/8) or 30 seconds (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
Safety devices serve for the protection of the user and
must not be put out of operation or bypassed with re-
spect to their function.
Safety mechanism against lack of water in
swimmer tank
The safety mechanism against lack of water prevents
the high pressure pump from being switched on when
there is no water.
EN
14
The temperature sensor switches off the appliance as
soon as the water temperature 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 overflow valve is
defective.
–
The safety valve is set by the manufacturer and
sealed. Setting only by customer service.
–
If the hand spray gun is closed, the overflow valve
opens and the entire water 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.
2
-
1
Temperature sensor
Winding protection contact
Safety valve
Overflow valve with flow switch
Pressure sensor
13
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