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Since last I posted, I moved WAY south (lil warm down here) and the house I moved into was a foreclosure so a few things needed done, namely the AC and furnace. When the guy did the job he said he would (did?) leave the old motor behind so I could use it for some airflow in the garage. Here's what it looks like...

big huge honkin' fan

Onto my real questions -- I don't have the wiring diagram, but if I had to guess, I'd say that plug is a speed control (black the common?), and the white is the hookup. Is that right? And has anyone rigged one of these up and if so, how'd you do it?

==== updated 7/1/2012 ====

I got motivated today and started to clean it and look for tags that might help identify what it is -- and well, I think this answers everything (and I got a good picture of it!). It's a Westinghouse 323P683 1/4 hp, 115v motor so xcythe you we're close on those wires (much better than my guess).

Westinghouse 323 P 683, 3 speed 1/4 hp motor

If I'm reading this correctly...

White-Red : low speed
White-Blue : medium
White-Black : high

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What does the white sticker with the circles say? That looks like a little pin out diagram –  DaveNay Jun 19 '12 at 23:32
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Do you know the make and model of the furnace? You might be able to find a schematic online if you do. –  Tester101 Jun 20 '12 at 16:32

3 Answers 3

Squirrel cage blowers make great fans. Black is ground, white-negative and red-positive. Looks like blue, white and red coming from the motor. Read the info on the motor, it should have split capacitor in it, may have to change the wiring from 220 to 110. Looks like a 1/4-1/5 horse. Ask a local HVAC guy, feed his ego and be rewarded. If its a 110 just throw a three prong on it and breeze away. I pulled some romex off the coil and pulled a spare heavy duty three prong outta my tool bucket and had a great workshop fan w/ a super long cord.(put a triangle shaped piece of plywood on one side to stabilize it, and a small board 1x2 across the front as a foot/stabilizer, made it quiet)

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There's not enough information here to give you a straight answer. It looks like there is some control circuitry in the metal box that's attached. I'd normally say remove that and figure out the wiring directly to the motor, but it appears that the start capacitor goes into this control box, and since that's necessary for the motor to start, you may need to keep the control box and figure it out. I'd open the box and see if there's a schematic on the inside cover that gives any idea.

If not, then getting a schematic for your old furnace would be the first step, if that isn't available or known you can use some techniques with a multimeter to determine how the motor is wound and use that information to hook it up. Lastly, check with the guy that made the suggestion - he should have an idea of how to hook it up to a plug.

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Just get an extension cord, cut off one end and wire the ground to the green ground lug or wire. Next, wire the red to the 'fan" side of the cap and wire the black to the hot wire (could be black or white so read the diagram)

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