Hi all: My daughter asked me to wire power to her deep water well... I will be using #12 2 wire w/ ground through a 20 amp circuit breaker to a 20-40# pumptrol pressure control switch... The pumptrol has four terminals in a line, the two end terminals are marked "L" and the two center terminals are marked "M"... The 240V wire to the pumtrol is provided by 1 black feed line and 1 white line, (each 120V)... The lines from the pumptrol to the pump are 1 black and 1 red. Each set has a ground wire... My question is; To which terminal does each individual wire connect too? Any help will be appreciated. Many thanks in advance. Don