Kärcher HD 9/100 Classic Originalbetriebsanleitung Seite 14

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Return flow of dirty water into the drinking water
network
Health risk
Observe the regulations of your water supply company.
According to applicable regulations, the device must
never be used with the drinking water network without a
system separator. Use a system separator from
KÄRCHER or a system separator as per EN 12729
Type BA. Water that has flowed through a system sep-
arator is classified as undrinkable. Always connect the
system separator to the water supply and never directly
to the water connection on the device.
Risk of damage
Damage due to cavitation can occur if air is present in
the high-pressure pump during operation.
Do not open the high-pressure gun during the venting
process.