Karcher HD 9-18-4 ST - Manual (Page 20)

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1 Solenoid valve water supply (upgrade
kit, optional)
2 Water inlet
3 Swimmer valve
4 Container of softener liquid
with solenoid valve (4.1), only with mod-
el ST-H (option with model ST)
5 Prepressure pump, only with model ST-
H
6 High pressure pump
7 Overflow valve
8 Back up valve
9 Pressure switch
10 Detergent injector
11 Pressure relief valve (upgrade kit, op-
tion)
12 Vibration dampener
13 High-pressure outlet
14 Pipe system (option)
15 High pressure hose
16 Trigger gun
with shutoff valve (16.1) and pressure/
volume regulation (16.2)
17 High pressure nozzle (triple nozzle)
18 Backflow valve, detergent suction un-
der low pressure
19 Dosage valve for detergent
20 Level sensor detergent (upgrade kit,
optional)
consisting of 1 detergent solenoid valve
(20.1) and 1 detergent level sensor
(20.2).
21 Cleaning agent container
22 Detergent dosing 2nd detergent, (up-
grade kit, option), consisting of 1 deter-
gent dispensing valve (22.1), 1 deter-
gent solenoid valve (22.2), 1 detergent
level sensor (22.3)
23 Detergent dosing 2nd detergent under
high pressure (upgrade kit, option),
consisting of 1 detergent pump (23.1),
and 1 detergent level sensor (23.2)
24 Detergent dosing, double under high
pressure (upgrade kit, option), consist-
ing of 1 detergent dispensing valve
(24.1), 2 detergent pumps (24.2), and 2
detergent level sensor (24.3)
25 Water filter (option)
With the decrease in total water flow the
water runs through the water inlet, the
swimmer tank, advance pressure pump hot
water and through the high-pressure pump
to the high-pressure outlet.
If only a part of the water capacity fed from
the pump is needed, the rest of the flow
runs through the flow regulator back to the
suction site of the high-pressure pump.
Detergent is suctioned via the detergent in-
jector and metered using the detergent dis-
pensing valve.
In order activate the suction, the multi-noz-
zle must be set to "CHEM" (low pressure
flat jet).
With the upgrade kit "Detergent dosing in
high pressure mode (option)", detergent
can be added via a detergent pump.
If the system pressure sinks during the
standby period due to the opening of one of
the consumers, the pressure switch will
switch on the high pressure pump.
Adding liquid softener will prevent the build-
up of lime when operating with hot water.
Starting with a hardness range of "medium"
(8.4 - 14 °dH) and a supply temperature of
more than 6C, the upgrade kit for water sof-
tening (DGT) must be installed, or an exter-
nal water softening system must be pre-
sent. ST-H appliances are suitable for hot
water operation of up to 85°C; ST applianc-
es are suitable for supply water tempera-
tures of up to 70°C.
Function
Flow pattern
Full pump capacity
Parts removal
Detergent
Automatic pump start
Softener system
20 EN