I'm attempting to reconnect an outdoor irrigation pump and I'm unsure which wires should connect to which terminals (labeled L1 and L2) in the pressure switch. The pump is a Myers HJ100S and the power is supplied by a 20A/250V three-prong plug with white, red, black, and bare copper wires.
Here is an image showing the setup. On my pump the connector on the left is labeled L1 and the one on the right is labeled L2.
I know where the grounding wire connects, but I'm not used to working with 240V. I believe that black and red are hot and white is neutral. Which wire(s) should be connected to each terminal?