A(red)—Upper water level control point. When water level gets to A point,
the probe touch water and controller can stop the pump by auto.
B(blue)—Lower water level control point. When water level gets off B point,
the probe out of reach water and controller can start the pump by auto.
C(black)—Should be placed in bottom of pool as the common line.
D(green) and E(yellow)are connected with C (black).