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Water and cleaning system (e-therm 500 M 18)
Water must be supplied to the high-pressure pump under pressure or directly sucked
in out of a pressureless container. The water is then forced under pressure by the
high-pressure pump to the lance. The high-pressure jet is formed by the nozzle at
the end of the lance.
Water and cleaning system
(e-therm 500 M 24 – e-therm 873 M 48)
Water can be connected at mains pressure to the high-pressure pump.
A float valve in the water tank regulates the water inlet. Then, the water is sucked
by the high-pressure pump from the water tank and supplied to the lance under
pressure. The high-pressure jet is formed by the nozzle at the end of the lance.
Bypassing the water tank water can also be sucked directly out of a pressure-less
container (see direct suction).
Environmental, refuse disposal and water protection regulations
must be observed!
Safety jet pipe with safety trigger gun
The high-pressure cleaner can only be operated when the trigger of the safety
deactivation trigger gun‘s trigger is actuated. When the trigger is pulled, the
safety trigger gun opens. The liquid is then transported to the nozzle. The spray
pressure increases and quickly reaches the operating pressure. When the trigger
is released, the safety trigger gun closes and any further spraying of liquid from
the safety jet pipe is prevented. The increase in pressure when the safety trigger
gun is closed causes the pressure control valve-safety valve to open. The motor is
switched off by the pressure switch. When thesafety trigger gun is opened, the
pressure control valve/safety valve closes, the motor is started and the high-pres-
sure pump resumes pressure spraying from the safety jet pipe with the selected
operating pressure.
The safety trigger gun is a safety device. Repairs should only be
performed by qualified persons. Should replacement parts be required,
use only components authorized by the manufacturer.
Functional details Functional details
Pressure control valve/safety valve
The pressure control valve/safety valve protects the high-pressure cleaner from
a build up of excess pressure, and is designed not to permit an excess pressure
to be selected for operation. The limit nut on the handle is sealed with a spray
coating. The operating pressure and spray rate can be steplessly adjusted by
turning the handle.
Replacements, repairs, new adjustments and sealing should only
be performed by qualified persons.
Motor protection switch
Motor is protected against overload by means of a motor protection switch.
In case of motor overload or blocking, the motor of the high-pressure cleaner
switches off automatically. If motor tends to switch off repeatedly, make sure
to detect appears. Make sure to detect and remedy the cause of the failure.
Replacements and inspection work should only be performed by
qualified persons when the high-pressure cleaner is disconnected from
the power supply, i.e. with plug pulled out from the electrical socket.
Total stop system with delayed motor cut-off
When opening the trigger gun the motor is started via a total-stop system. When
closing the trigger gun the motor is switched off only after 38 seconds and the
device is in standby mode.
The delayed switch-off is necessary because switching
on and off motors frequently on high-pressure cleaners of this size may involve
heavy load on the power network and cause increased wear of internal electrical
parts. After 20 minutes in standby, the device will disconnect from the mains and
must be turned on again by the main switch. The machine restarts automatically
when the gun is re-opened, provided that the master switch is on.
14


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