Posted by jdemaris on January 04, 2010 at 10:45:53 from (67.142.130.47):
In Reply to: Well pump???? posted by old on January 04, 2010 at 08:35:54:
Seems you'd better do your homework before believing some of the replies you've gotten. A 1 horse pump motor that draws 20 amps at 120 VAC is no less efficient than the same 1 horse motor run at 240 VAC and drawing 10 amps per line - but with two lines instead of one (still 20 amps). A 1 horse motor that's 2400 watts is 20 amps one-line on 120 VAC and 10 amps two-lines on 240 VAC.
Watts is watts, period. Only gain with 220-240 is the ability to get the job done with smaller wire. If wired correctly, it makes no difference.
In your case, what are the three wires for? Some 120 VAC setups use a power, neutral, and a capacitor/start wire and have a "start box" inside the house.
I don't know what you have, but if changing from 120 VAC to 240 VAC, you'd better make sure you've got the correct wires to do it. If the new one is a two-wire pump with built in start capacitor, you'll probably be fine. Just look at your exisiting wires, see what gauge and how many, and read the new pump specs.
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