I have a 30 ft well... 17 ft of it is water. A Flotec FP2222 2 wire 3/4 HP pump. A 20 gal pre charged pressure tank. A Sqaure D pressure switch (with NO Low pressure cut-off switch). I have 3 hydrants hooked up..(They are 1ft, 100ft, and 200ft away from well). I am using this for watering my lawn.

The minute I open my hydrant the pump kicks on and stays on maintaining 40psi. It will only shut off when I close the hydrant. How to I adjust my regular Square D pressure switch so that the pumps cuts off at 40 and turns back on at 20?

I do appreciate your help.