The problem is the schematics show 4 wires coming in. A red, white, black and green. But I'm using a 3 prong so I just have a black, white and green. So should I put the black where it's supposed to go or where the red should go? Its definately burning out my main contactor. Thanks again!
Black = L1
Red = L2
White = common
Green = ground
So back and red are the same, each being 120 Volts. You will not be able to build a 240 system unless you use both red and black. you either need to upgrade your connection of build a 120 system.
I'm going to assume that you are using a 240V dryer or range receptacle to plug this unit in. Please verify that this is the case.
The three wires coming into your receptacle should be black, red, and green, but I believe it is fairly common to use the more readily available cable that has black, white, and green. You have two hot lines each at 120V referenced to ground, that are 180 degrees out of phase with each other, so that the voltage between the two hots is 240V. So, you should treat the white wire as if it was a red wire.
Your problem is that you cannot run that panel design on a three wire supply, that only makes 240V available. Your contactor coils are rated at 120V, as are the pumps. To get 120V in the panel, you need to have two hots, and a neutral. Your contactors are failing because you are putting 240V on the coils that are only designed for 120V. This causes the coils to fail in a short amount of time.
You could replace your contactors with units that use 240V coils (as well as replacing the alarm light/buzzer, and the LED block in the alarm switch, with 240V rated units), but you still wouldn't be able to run the pumps from your panel without burning them up. You could of course also replace the pumps with 240V units.
The easiest solution appears to be getting a proper 4-wire receptacle wired for this controller.
Brew on