Near Intersection of I-35 & I-90 Southern Mn. | BLUF. Your new valve uses 3 wires like your old but must be wired differently. You must provide a constant hot to the new valve. This will need to be a wire from some 12V source that can provide enough power to run the valve. One of your current wires is constant ground, it can be used for the constant ground on the new valve. Of the two remaining wires one of them goes to 12V when the section is ON. Use it to trigger the new valve. The other remaining wire would not be used and must be taped off as it goes "hot" when the section is to be off.
Here's why: For any ball valve to work the motor must be able to run in both directions. This means a polarity reversing scheme must be used.
Your original valves expected that this polarity reversing was done outside the valve in other words as part of the sprayer wiring. To open the valve, the sprayer sent + 12V to one wire and Ground to the other. To close the valve the sprayer sent ground to the first wire and +12V to the second wire. The third wire was a constant ground. Internal limit switches break the circuit when the ball is fully opened or fully closed.
The valve you have purchased has this polarity reversing arrangement built inside the valve itself. It needs a constant 12V (meaning always hot), constant ground and a trigger wire. With power and ground connected, the Normally Closed terminals of an internal relay will run the motor in the direction to close the valve until a limit switch is reached and then the motor will stop. When 12V is present on the trigger wire, the internal relay becomes activated and the Normally Open terminals of the relay send the opposite polarity to the motor causing it to turn the direction to open the value. The motor runs until another limit switch is reached.
The valve that you have purchased with the internal relay is the type most commonly used with spray controllers. Deere chose to do this the other way.
Edited by tedbear 7/11/2020 06:40
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4710 sprayer valve actuator wiring help
