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Thread: 115 volts or 220 volts to well pump

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    Default 115 volts or 220 volts to well pump

    My brother in law tore down his house. The only thing left is the well with two wires coming out of it. One yellow and one red. Should we run 115 volts or 220 volts. Thanks

  2. #2
    Electrician Chris75's Avatar
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    Quote Originally Posted by JoeBarth View Post
    My brother in law tore down his house. The only thing left is the well with two wires coming out of it. One yellow and one red. Should we run 115 volts or 220 volts. Thanks
    You should have looked at how it was wired before, now you'll have to pull the pump to check the HP and voltage of the pump. Also, is there a ground wire for the pump?

  3. #3

    Unhappy

    I don't see a ground wire. Live and learn. Need to use the well temporarily on the new house. How easy does the pump pull out? Can I run 115v and check the amps?

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    Engineer Furd's Avatar
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    Some (most-all?) submersible pumps have a "control box" located in the house or well house. If you need, but don't have, this control box you may be SOL.

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    In the Trades Bob NH's Avatar
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    Measure the resistance between the two wires. Then see if it corresponds to values for any particular size motor. Even if it does, that doesn't mean it is going to work.

    With only 2 wires it is either a 2-wire pump or it isn't going to work.

    Red and yellow might indicate that it is a 2-wire 220 Volt pump.

    Older pumps had no ground wire.

    220 Volt pumps had no neutral; therefore usually no white wire.

    I would try connecting 115 Volts for a few seconds. If it is a 2-wire pump it is probably thermally protected. If no water (or little water) comes out in 30 seconds, try 220 Volts. You don't have much to lose.

    If you put 220 Volts on a 115 Volt pump it should trip out on thermal protection in a few seconds.

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    Wire colors for a three wire Pump are usually Red, Yellow and Black. Two wire Pumps have a Red and a Black. If you have a Yellow and a Red, you have probably not yet located the Black wire. It may be broken off in the Well. So chances are you will have to pull the Pump to make repairs anyway.

    bob...

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