Nilfisk-ALTO NEPTUNE 5-46 PE, Service Manual

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NEPTUNE PE-DE_en_Ver.1.0_October 2010
Function
Flow switch function NEPTUNE PE
Flow switch
Plug with Shaft
Water supply connected to the machine.
Water from the pump is pressed through the high pressure hose to the first flow switch.
When water is entering the first flow switch, the piston with magnet is pressed to the top of the flow
switch housing, and the reed switch is making contact and closing the circuit.
(Reed switch is a NO contact)
Water is now pressed through the second flow switch, the piston with magnet is pressed to the far
end of the housing, and the reed switch is making contact and closing the circuit.
When the spray handle is released and the water flow stops, the flow switch pistons will move away
from the reed switches, and the will brake off the circuit and the burner will stop.
When the water flow stops, the piston in the first flow switch will fall down and be stopped by the
plug with the shaft. The plug with shaft is installed to reduce the movement of the piston.
The signals from the two flow switches must come simultaneously. (MAX. difference between the
two signals are 4 seconds)
The signals from the flow switches are controlling the fuel pump solenoid valve. This to make sure
that the burner is not starting if there is no flow of water through the heating coil.
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