Function - Kärcher HD 7/16-4 ST Instructions Manual

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
detergent solenoid valve (22.2), 1 de-
tergent level sensor (22.3)
20

Function

Flow pattern
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)
Full pump capacity
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.
Parts removal
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
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.
Automatic pump start
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.
3
-
EN
Softener system
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
present. ST-H appliances are suitable for
hot water operation of up to 85°C; ST appli-
ances are suitable for supply water temper-
atures of up to 70°C.