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Help with wiring shop made air filter

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Forum topic by Bob_B posted 10-29-2009 04:14 AM 1450 views 0 times favorited 14 replies Add to Favorites Watch
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Bob_B

29 posts in 2742 days


10-29-2009 04:14 AM

I’m finally getting around to building my air filter. I picked up a furnace blower (squirrel cage fan) from a local heating guy. I have 2 questions about the electrical. (FYI – the motor is 1/3hp 1050 rpm)

1. There are White, Black, Green and Red wires coming from the motor. I was expecting white, black and green, but the red was a surprise. Why is there a red wire and what do I do with it?

2. I’m guessing this fan is going to be a bit more powerful than I actually need. What would be the best way to add “speeds” to the unit?

Thanks,
Bob

-- Bob B - Warwick, Rhode Island


14 replies so far

View ChunkyC's profile

ChunkyC

856 posts in 1950 days


#1 posted 10-29-2009 04:19 AM

It may be a 4 wire 240Vac motor or maybe it’s a dual voltage motor. The name plate on the motor will tell you exactly how it should be connected. But all of my experience is industrial 3 phase, I’m sure the guys that have more residential experience than me will chime in.

The best way to speed the fan is by gearing / belt pulleys. If it’s not a capacitor start motor than you can use a variac to change the speed but I’m confident that it’ll have a cap start on it.

-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135

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papadan

1156 posts in 2064 days


#2 posted 10-29-2009 04:20 AM

Well Bob, without more info, that wiring could be one of 2 ways. 1. black and red being 2 legs of 220 v with white being neutral and of course green being ground. The other possibility is black is one speed and red is another speed of a 110 v motor, white and green as before. No label on or in the motor?

-- Carpenter assembles with hands, Designer builds with brains, Artist creates with heart!

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a1Jim

112366 posts in 2273 days


#3 posted 10-29-2009 04:27 AM

I it’s a little scary to give wiring info without being there.

-- http://artisticwoodstudio.com Custom furniture

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Bob_B

29 posts in 2742 days


#4 posted 10-29-2009 04:30 AM

It’s a direct drive unit, so gearing thru pulleys is out.

The only plate I can see on the motor (without pulling it out) is the 1/3hp , 1050rpm plate. Looks like I’ll have to pull the motor.

Thanks.

-- Bob B - Warwick, Rhode Island

View Luke's profile

Luke

540 posts in 1990 days


#5 posted 10-29-2009 04:51 AM

I think the red is either one half of a 220 or it is a lower speed than the black. If it was me I’d take an old plug and cut the wires off the female side. Use that to “hot wire” the motor while the blower is securely mounted to something so it won’t jump. Try it with just the black and then just the red and see if you notice a difference. Of course you need to be really safe. Connect the wiring while its unplugged and then step back and plug it in really carefully being ready to pull it out quickly if something crazy should happen. The only way to add speeds to a unit would be to get different gears or something. If you vary the voltage to change the speed I believe you would damage the motor as it probably wasn’t made to do that. I’m no electrician so whatever I say is just from my experience. I took a motor out of an old blower once and now have it mounted in my band saw. I went through many a gear to find one that slowed it down enough to be strong and do some resawing of thick boards. Of course if you have the time and know someone who claims to be an electrician, it would be best to get them to look at it. I just don’t have that luxury.

Good luck

-- LAS, http://www.abettersign.com

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papadan

1156 posts in 2064 days


#6 posted 10-29-2009 04:55 AM

As Skywalker said, the wite wire is used with either the black or red for the test plug.

-- Carpenter assembles with hands, Designer builds with brains, Artist creates with heart!

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ChunkyC

856 posts in 1950 days


#7 posted 10-29-2009 05:00 AM

If you have a lathe, you can always turn a test pulley from hardwood until you get the speed that your looking for. Then purchase the size pulley that you need.

Oh never mind, direct drive. You said that once.

—Memory’s the second thing to go, I can’t remember what the first was.

-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135

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ChunkyC

856 posts in 1950 days


#8 posted 10-29-2009 05:03 AM

From a DIY web site: It’s a two speed motor. Red and Black are your hot wires, green to ground world round and white is common. One (red or black) is fast and the other is slow speed.

-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135

View Bob_B's profile

Bob_B

29 posts in 2742 days


#9 posted 10-29-2009 02:20 PM

Thanks guys for helping with this, I really appreciate it.

-- Bob B - Warwick, Rhode Island

View JimF's profile

JimF

141 posts in 1989 days


#10 posted 10-29-2009 05:12 PM

I have one of these rigged up for air circulation. It had a diagram for wiring the motor on the housing. I don’t recall wire colors and am 50 miles from the shop, but there were two speeds based on which wires were used. If it has a manufacturer’s name and model number an internet search may get you a wiring diagram.

-- Insert clever tag line here

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Bob_B

29 posts in 2742 days


#11 posted 10-29-2009 05:24 PM

Just finished wiring it up. After finding a wiring diagram for the motor, the white wires are connected and then it’s either black to black (for high speed) or black to red (for low speed).

Thanks for all of the replies!

Bob

-- Bob B - Warwick, Rhode Island

View TopamaxSurvivor's profile

TopamaxSurvivor

14905 posts in 2372 days


#12 posted 10-30-2009 01:44 AM

Most 120 v single phase blower motors have multiple speeds with different colored wires for each speed. I havce seen them with as many as 5 or 6 speeds.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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MarkwithaK

370 posts in 1874 days


#13 posted 10-30-2009 05:57 AM

TopamaxSurivor is correct. One most blower moors you will find a minimum of 2 speeds (only one on a really old motor) a high speed for A/C and a lower speed for heat. More often then not you will see 3-4 speed motors. And for what it’s worth, the black is usually your high speed.

-- If at first you don't succeed then maybe skydiving isn't for you.

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MarkwithaK

370 posts in 1874 days


#14 posted 10-30-2009 05:57 AM

Opps, see you figured it out. Sorry.

-- If at first you don't succeed then maybe skydiving isn't for you.

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