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OPERATIONS MANUAL Rev. 1.4
Description and Function of the Safety Installations
• Unloader Valve for Bypass Mode
The high-pressure valve limits the operating pressure. When the maximum operating pressure is
exceeded or the handle is closed, the unloader valve administrates the water over a bypass connector
back to the water tank through the water diffuser.
• Safety Valve
The safety valve limits the maximum operating pressure to 550 Bar. If the maximum operating pressure
exceeds the specified limit due to closing of the spray handle the unloader valve receives a switching
surge and the channels the water through its bypass.
In case of excessive pressure more than the permittable limit for any other reason, the safety valve is
activated and allows to leak through it, thus reducing the pressure.
• Protection against freezing
Freeze can destroy equipment which has not been emptied completely of water.
To protect the machine against frost it must be stored with antifreeze fluid filled inside the water tank.
Fill approximately 4lt into the water tank and run the machine without high pressure hose in order to fill
the pump with antifreeze liquid.
In order to reach the antifreeze in all the parts please start the machine 2-3 times, till antifreeze comes
out of the high-pressure outlet.
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