The strictly dictates the electrical setup. For submersible models, this includes checking the insulation resistance (Megger test) of the power cables before the pump is even submerged. A reading below the threshold specified in the manual (often 1 Mega-ohm or higher) indicates moisture ingress in the cable or motor, requiring immediate attention before startup.
Disclaimer: This guide is a synthesized reference. Always refer to the original Naniwa Pump Manual provided with your specific unit for exact specifications. naniwa pump manual
A (from manual): Absolutely not. Reverse rotation loosens the impeller nut, causing the impeller to travel forward and smash into the casing volute. The strictly dictates the electrical setup