Nilfisk-ALTO NEPTUNE 5-46 PE, Service Manual

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NEPTUNE PE-DE_en_Ver.1.0_October 2010
Function
Functional desription of Circuit Board, A1
Control Circuit Board (A1) is functioning the same way in all the NEPTUNE PE/DE models. The
power supply to A1 is supplied by the 230V generator G2, which is driven by the motor. This means
that the motor must be running—and running at full RPM—before the A1 is working. In cold water
mode the S1 main switch can be in position ON or OFF. If S1 is turned to the temperature area (red)
the hot water mode is activated.
When S1 is turned to ON power is supplied through the fuse F1 to the microprocessor. The micro-
processor is starting up, and the 5 status LED’s is lightening up for 1 sec. If there is a failure during
start up, the control circuit board goes into failure mode.
If the S1 main switch is turned to “hot water mode”, and the spay gun is open, and desired tempera-
ture set at S1, B1 temperature sensor is measuring lower temperature that the set point at S1, and
B9 fuel level sensor is measuring fuel in the tank, and B2 flow switch, and B4 flow switch is register-
ing water flow, the burner motor M2 is started, and the ignition transformer T2 is started over the
burner relay K3. A high voltage spark is generated between the electrodes in the burner.
The burner motor M2 is driving the burner fan, which is blowing pre-heated air into the boiler. The
self-sucking fuel pump is pumping fuel pressure up to the fuel solenoid valve Y1. When the burner
motor/fan has been running in 1 sec., the fuel solenoid valve Y1 opens, and the fuel is pumped un-
der pressure to the fuel nozzle. The atomized fuel is leaving the fuel nozzle and is ignited.
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