Convert a 3 wire well pump with control box setup to a 2 wire pump.

[Dahole]

I currently have an older well pump that is a 3 wire with a control box that sits next to the pressure tank in the house and the pump is being replaced with a new 2 wire with built in relay. I already have the wire coming from the new pump spliced on and a new seal kit installed on the connections. 1 black to red, 1 black to black and the green yellow to green on my wire that will go down the well to the pump. My question is how to wire this to the line from the control box down by the well and then what I do with the wires from the pressure switch to the control box and then the control box itself since I no longer need the actual stuff in the control box?

I searched the forum and also the web for an answer and can’t seem to find it.

 

[Valveman]

Two wire pumps don't need the control box. Just wire from the breaker to the two outside posts on the pressure switch. Grounds go to the green screw on the pressure switch metal case. The two hots to the motor go in the inside two posts of the pressure switch. Two wire motors can't stand as much cycling on and off as a three wire, so make sure to use a Cycle Stop Valve to make it last a long time.

 

[Dahole]

Thanks this was helpful. What I also learned is you can pop open the control box and pop out the white plastic bar that everything is wired to and just use lever locks to tie the wires together if you can’t easily get the wire from the control box over to the pressure switch.

 

[Valveman]

Never had to remove the terminal strip. The wires should go from the pressure switch to L1 and L2 on the terminal block. Twist locks or Scotch locks don't work so well splicing pump wires as the high amperage causes the connection to get hot and arc out.