Question about AO Smith 1 1/2 HP 115/230V 56C Replacement Motor

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Wiring new motor

I bought a new motor for my pool an ao smith B855 2 hp but I neglected like so many others to tag the wires. Problem...i have the green ground wire but both others are black. Diagram is L1 and L2 both have two terminals. L2 has a white wire attached to one side. I also have one terminal B that stands alone at the top of the motor and terminal A that also stands alone at the bottom of the motor. I'm sure it matters which line goes where? Help?

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The L1 and L2 are the load terminals. Connect the black wires to the L1 and L2 and the green one to the green colored screw.

Posted on May 16, 2010

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SOURCE: Wiring new motor

I am assuming you are running 110 vac. Usually there is a diagram on the plate with the motor specification. You want the low voltage for110 and high for 220 motor wiring diagram you connect the motor as shown. If it is not on that motor it maybe on the old one they are usually the same.


You will need wire nuts to tie together the wires.

Note if this is a capacitive start or switch start. Allot of pool pumps are Switch start.

Posted on Mar 24, 2010

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Is it going to run on 230V then? If so you would normally use red and black. The white wire should be a neutral and the ground wire is obviously ground.

Do you have a meter you can use to confirm the voltage between the wires? If you do you'll want to start with red and white since you seem to think black was not being used before. If the voltage reads 230 and the motor is set up for 230 then attach one wire to L1 and the other to L2...it will not matter which is connected where as long as one is on each terminal. Insulate the black and ground the ground lead to the motor ground screw.

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Wiring new motor


I am assuming you are running 110 vac. Usually there is a diagram on the plate with the motor specification. You want the low voltage for110 and high for 220 motor wiring diagram you connect the motor as shown. If it is not on that motor it maybe on the old one they are usually the same.


You will need wire nuts to tie together the wires.

Note if this is a capacitive start or switch start. Allot of pool pumps are Switch start.

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IF THE SCREW ABOVE IS IN THE METAL MOTOR HOUSING IT IS MOST LIKELY THE GROUND. GREEN WIRES ARE ASSOCIATED WITH GROUND IN ALL ELECTRICAL APPLICATIONS. YOU SHOULD BE SAFE IN HOOKING THE GREEN TO THE SCREW. HOPE THIS HELPS, JODY

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