Question about AO Smith 1.5 hp Swimming Pool - Jet / Well Pump Motor - / Century B123

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A O Smith 2green motor with timer wiring.

Motor label shows line in to each of the "L" terminals. Most 2speed motors seem to need line in to L1, common to L2 and other line in to "A", What is the right way to wire this puppy?

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  • Master
  • 717 Answers

It is hard to say because each motor Mfg puts their own spin on the high low terminals.
there is usually a wiring diagram on the outside of each motor explaining that and it is clearly not on yours.
I would go to the motor Mfg website to get a wiring diagram for your particular brand.
Rod @ US Parts Center

Posted on May 09, 2013

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SOURCE: I'm trying to hook up

Yes, it will handle the voltage...

It is odd indeed as a normal AOSmith two-speed motor will have quick-connect AND screw posts for line connection terminals. If you are certain there are only two screws yet the motor is a two-speed then the answer to the first question is yes; you'll need a female quick-connect terminal for your second line connection to the A terminal.

John

Posted on Apr 11, 2011

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1 Answer

Proper wire hook up


black goes to L1 white goes to L2 make sure to look on side of motor to change from 220 volt to 110 volt either a knob or changing wires brown and white to different locations hope you didnt fry motor

Jul 26, 2013 | AO Smith 1.5 hp 3450rpm 48Y Frame 115/230...

1 Answer

Replaced an old Magnetek century two speed with a AO smith century two speed. Hooked the wires up the same but unable to get the motor to operate in the high speed mode, suggestions!


Each motor will have wiring diagram on label.
Compare diagram on old motor with new motor.

WIRE COLORS VARY
Which 2-speed timer do you have on the circuit?
Wire lead from NO terminal connects to High speed.
Wire lead from NC terminal connects to Low speed
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#2-speed
http://waterheatertimer.org/pdf/AO-Smith-motor-wiring.pdf

Oct 23, 2012 | Pool & Spa

1 Answer

Does it matter wrong connection (switching cables) on a single phase electric mottor


Most larger 120 V motors have the option to be wired for 240 V, and as a result need half the current - which translates to lower installtion costs do to a wire size the can be reduced.

These motors have simple terminals like L1, L2 and two or more similar to 1, 2, 3, 4 or A, B, etc. that can be connected that permits selecting rotation direction, speed(s) and voltages.

Nearly all these motors will require that L1 and L2 terminals be connected to the power, whether it is a hot and neutral for a 120 v supply, or hot and hot as would be the case for a 240 v supply. It would then require the correct connection / jumper connection of the other terminals to tell the motor which voltage is being supplied. An incorrect combination here could be disastrous. Either way, L1 & L2 is power in. Consult the label on the motor to correct wiring - and if by chance one of the L1 or L2 terminals is specified for neutral, it should be connected that way.

I hope this helps & good luck!

Apr 26, 2012 | Smith 2hp Pool Pump Motor A O Electric...

1 Answer

What happen with a wrong connection on a single phase 2hp sp motor


I'm not sure which motor you have - the heading shows a 1HP type - yet you talk about a 2HP type. Anyway, the label on the motor should have a wiring diagram. You must have a label on the motor to know how to wire. It may have two diagrams - one designated as "high voltage" and the other "low voltage". Check the label for voltage.. it likely says "120/240 volts". The 120 uses the low volts diagram and the 240 uses the high volt diagram. If the motor has terminals L1 and L2, these will most likely be the point of connection for power - regardless if it 120 or 240, unless the label states otherwise. Unless the neutral connection is specified on the label, it does not matter which L1 or L2 you connect it to.

The other terminals will be required to be connected properly. Motors use these connections or jumpers to set options such as voltage, direction of rotation, speed(s), etc. An incorrect setting here can cause unexpected results as far as speed and rotation, or catastrophic results if you supply this motor with 240 volts but set the jumper for 120 volts.

Here's a link to their catalog with telephone numbers for you to review.

Good luck!

Apr 26, 2012 | A O Smith Motors A O Smith 1hp 115/230v Ur...

1 Answer

My pool originally had a 2 speed AO Smith pump motor. Several years back it was replaced with an AO Smith single speed motor. I am replacing that motor with a new AO Smith single speed Centurion Switchless...


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.

If the voltage is not 230 between those two check between red and black. If that is the 230 then insulate white and put red and black to L1 and L2.

John

May 23, 2011 | AO Smith 2 hp 3450rpm 56C Frame 230 Volts...

1 Answer

I'm trying to hook up an AO Smith two speed motor to just run the low speed. The pump is for a water feature and it doesn't need the high speed, so I want to run it on low speed to save cost. My...


Yes, it will handle the voltage...

It is odd indeed as a normal AOSmith two-speed motor will have quick-connect AND screw posts for line connection terminals. If you are certain there are only two screws yet the motor is a two-speed then the answer to the first question is yes; you'll need a female quick-connect terminal for your second line connection to the A terminal.

John

Apr 03, 2011 | AO Smith 1.5hp Pool Pump Motor 2 Speed Ao...

2 Answers

I bought a red lion sprinkler pump with an A O Smith 1.5HP electric motor on it. A O Smith model # CET50ABH, serial # 27308J2. I knew I would have to wire it (115/230v capable) and I want to go the 115v...


Your black and white wires go on L1 and L2. It will not matter which wire goes on with line terminal as long as you just put one cord wire on L1 and one on L2. Be sure you properly switch the motor to run on 115V since it will facotry prepped for 230.<br /> <br /> John

Aug 18, 2010 | AO Smith 1 1/2 HP 115/230V 56C Replacement...

1 Answer

How do i convert motor from 120v to 220v


you should have a label on the pump that shows the connections. 120V=low voltage 220V=high voltage. Here is an example of a label:
Conect the internal motor wires to the terminals indicated. Then connect your line to the terminals indicated
f54dc74.jpg

Jul 19, 2010 | AO Smith 1.5hp Pool Pump Motor 2 Speed Ao...

1 Answer

Wiring new motor


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.

May 14, 2010 | AO Smith 1 1/2 HP 115/230V 56C Replacement...

1 Answer

I installed a new pump, motor and timer, but the


Be sure you are actually one the L1 and L2 posts and/or screws. On some of the motors there is a third quick connect tab that is not used when set for 230V lines but if you connect one of your incoming line leads to it the motor wont work. If that is not the case, be sure you have a resistance reading somewhere close to 1 ohm across the L1 & L2 terminals. If you get infinite, there is a problem with the motor. I assume the motor is completely silent when you turn on the switch? If not and it is humming but not starting, have the capacitor checked and if necessary, the motor start switch and winding.

Oct 30, 2009 | Hayward 2HP Pool Pump Motor A O Smith...

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