technical help? anyone? : LUSENET : Junkyard Wars : One Thread

i hav a question about wiring a 240v ac 1/2hp motor i pulled out of an air conditioner. i hav 5 wires coming out of it , blk, red, blue, brwn and yellow, i want to put an on/off switch on it. can anyone help? am i even in the right place? thx.

-- ranx arox (, February 04, 2001


if you only need/want a 1/2hp motor........most chain hardware stores have them in the swamp cooler or furnace section for all of about $35- $50US ... and they only have 2 wires.......yours is probably a multi speed unit

-- tim (, February 04, 2001.

Maybe you should try Bob Villa's website?

-- John Gap (, February 04, 2001.

That's an air cond. condenser blower motor with three speeds. The wires are as follows: Yellow; Common, connects to one line of the AC supply, also goes to one side of a capacitor,usually about 12.5 microfarad for 1/2 HP @ 230V. This wire usually has a white stripe on it also. Brown; Goes to the other terminal of the capacitor The remaining three connect to the other AC supply line, in this order; black = high speed, blue=med speed, red=low speed. Connect only one of these three wires at a time a time. If two speeds are hooked up at once, the motor will burn out before you can get your hand off the switch. Use a double pole switch, and switch both lines of the AC coming to the motor. The load should not exceed about 4 amps, but most blower motors have internal thermal protection and will shut down if they overload. Look closely at the label on the motor for a wiring diagram, and this should be evident. Good luck. You have used up your free help cookie here, so next post, please post something about "Junkyard Wars." Waddy Thompson, "Wreckspert" for the "Rusty Juveniles" Jan 3rd.

-- Waddy Thompson (, February 04, 2001.

Are you sure it's not a 3 phase motor???? Sounds to me like you need to check that out first. It should either say "single phase" or "3 phase" on the tag. A 3 phase motor can be made to make work on single phase (normal 240 volt), but it would be easier to get a different motor.

-- Rick The Rocket (, February 05, 2001.

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