Elec. motor ?

kswillie · Feb 7, 2011

Making a squirrel cage fan using a 110v motor from a furnace. Three wires from the motor black, gray, red. If I put voltage to the black and gray wires the motor comes on. What is the red wire for and where should it go?

John Harmon. · Feb 7, 2011

You sure it's a 110V ? Black and Red are common 110V run circuits, the gray? Whats the HP?

LilFarmer · Feb 7, 2011

Probably a two speed motor, black and gray or red and gray.

kswillie · Feb 7, 2011

Plate says it's 110v 1/3 hp. Do you just leave one wire caped or tie it to one of the other wires?

LilFarmer · Feb 7, 2011

Use the gray as the common or neutral, use black or red for the hot. Cap the one you do not use. If it has a plate on it you should be able to find which color is hi and which is low.

504 · Feb 7, 2011

In case you do not know it, the fan will work better if you restrict the out flow. I thought the guy was crazy when he told me, but try it yourself.

Geo-TH,In · Feb 8, 2011

Usually common is a white wire, black is high speed and red is low speed. I'm guessing that your gray is common. I would use black and gray and measure the amp draw. Most motors have the amps draw on them and the wiring diagram too. Harbor freight sells a cheap amprobe for around $20.

If you want to take a chance, just use black and gray and wait for a few minutes. If the motor doesn't get hot and stink, I'd say you are good to go.

Elec. motor ?

kswillie

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John Harmon.

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LilFarmer

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504

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Geo-TH,In

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