Safety Devices; Assembly & Installation Instructions - Kärcher HDS 4.0/20-4 Ea Mode D'emploi

Safety devices serve for the protection of the user
and must not be put out of operation or bypassed with
respect to their function.
Overflow Valve With Two Pressure
Switches
While reducing the water supply at the pump head or
with the Servopress - regulation the overflow valve
opens and part of the water flows back to the pump
suck side.
If the hand-spray gun is closed, so that the whole water
flows back to the pump suck side, the pressure switch
at the overflow valve shuts down the pump.
If the hand spray gun is opened, the pressure switch
on the cylinder head turns the pump back on.
Safety Valve
The safety valve opens, when the overflow valve resp.
the pressure switch is broken.
The safety valve is set by the manufacturer and sealed.
Setting only by customer service.
ASSEMBLY & INSTALLATION INSTRUCTIONS
ASSEMBLY
Unpacking
Unpack carefully. Wear safety glasses or goggles while
unpacking, assembling or operating pressure washer.
If there are missing components or hidden damage
immediately contact distributor or carrier concerning
discrepancies.
1. Cut strapping band from pressure washer and pallet.
2. Remove pressure washer from pallet.
Check the contents of the pack before unpacking.
For scope of delivery see page 7.
INSTALLATION
Getting Started
IMPORTANT: Proper initial installation of equipment
will assure more satisfactory performance, longer
service life and lower maintenance cost.
WARNING: If connection is made to a potable water
system, the system shall be protected against back-
flow.
The pressure washer should be run on a level surface
where it is not readily influenced by outside sources
such as strong winds, freezing temperatures, rain, etc.
The pressure washer should be located to assure easy
access for filling of fluids, adjustments and maintenance.
Normal precautions should be taken by the operator to
prevent moisture from reaching the pressure washer. It
is recommended that a partition be made between the
wash area and the pressure washer to prevent direct

SAFETY DEVICES

Water Shortage Safeguard
The water shortage safeguard prevents the burner to
be turned on when there is water shortage and thus
protects the heat exchanger from overheating.
The lack of water fuse is a safety component and there-
fore its locking screw is sealed.
The lack of water fuse functions immediately.
It switches the burner off immediately in case of insuf-
ficient water volume and back on after the water level
has been replenished.
The dry run protection is initiated when the lack of water
fuse signals insufficient water volume for 2 minutes. The
appliance shuts off with a fault message and locks up.
The appliance can be started back up by switching it
off and on via the program switch.
Temperature Stop For Exhaust Gases
The temperature stop switches off the machine when
the waste gases have reached very high temperatures.
spray from the wand coming in contact with the pressure
washer. Moisture reaching the equipment will reduce the
pressure washer's life. All installations should comply
with the local codes covering such installations.
Placement
Do not locate near any combustible material. Keep all
flammable material at least 20 feet away.
Allow enough space for servicing the machine.
Local code will require certain distances from floor and
walls. (Two feet away from walls should be adequate.)
Venting
CAUTION: All venting must be in accordance with ap-
plicable federal and state laws, and local ordinances.
Consult local heating contractors.
If the pressure washer is to be used in an enclosed
area, a flue must be installed to vent burner exhaust to
the outside atmosphere. Exhaust gases should not be
vented into a wall, a ceiling, or a concealed space of a
building. Be sure the flue is the same size as the burner
exhaust vent on the pressure washer lid. Poor draft will
cause the pressure washer to soot and not operate
properly. When selecting the location for installation,
beware of poorly ventilated locations or areas where
exhaust fans may cause an insufficient supply of
oxygen. Proper combustion can only be obtained when
there is a sufficient supply of oxygen available for the
amount of fuel being burned. If it is necessary to install
the machine in a poorly ventilated area, outside fresh air
may have to be piped to the burner and a fan installed to
bring sufficient air into the machine. Locate the pressure
Operating Manual HDS Premium 9.808-215.0
9