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Emerson 2-speed fan - wiring question  Rate Topic 
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 Posted: Sun Jun 23rd, 2013 03:46 pm
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Dan Wyatt
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First thanks for any assistance.

I am in the process of restoring an old Emerson 78646-BC and I have a question. I took pictures of the stator and wiring after I removed it and thought that I would easily be able to use these pictures for reference when color coding the 3 wires during a re-assembly if needed as a "back up plan".......well in my haste to attach the new head wires I used shrink tubing and liquid tape and whatta ya know.......I covered up the color of each head wire.......not to worry I thought ........I refer to my aforementioned pictures and find out that being able to see the colors of the sheathing on the old head wire stubs was questionable.......I think I can see the yellow, red, and green, but that is why I am double checking my hypothesis concerning how to hook this old fan back up correctly. 

Here is what I do know and instead of me telling you my hypothesis I will present numbered wire combinations with ohms readings and then someone that is a motor expert can convert each numbered wire to what color each number is for proper re-wiring.

With my ohms meter set on 200 ....... I get the following readings from the different combinations of numbered wires 1,2, and 3 coming from the stator:

1 to 2 = 27.8
2 to 3 = 17.1
1 to 3 = 12.4  

Given the numbered wire ohms readings, please tell me what numbered wire should correspond to what color of wire. 
wire #1 = what color
wire #2 = what color
wire #3 = what color

Again I have my ideas, but want to check them out as I am not an electric motor expert.

Thanks again for any help and ..........now here is a picture of my 2 speed switch and the incoming power "line connection block" that is the other part of the equation which obviously when the wiring question is figured out .........should correspond to the numbered / colored wires in this picture: 
  

Attached Image (viewed 1465 times):

4 colors of wire questions.jpg

Last edited on Mon Jun 24th, 2013 12:01 am by Dan Wyatt

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 Posted: Sun Jun 23rd, 2013 04:45 pm
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Steve Stephens
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This is identical to Dan's fan.

Attached Image (viewed 1020 times):

CIMG2048.JPG

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 Posted: Sun Jun 23rd, 2013 07:21 pm
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Tom Newcity
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Dan, This is the best I can do for you with my logical way of understanding your fan.  I've kept notes on all the different fans I have worked on, but this one isn't one of them.  Unless someone of more motor knowledge offers some suggestions, you might try this.  With 2 speeds, 3 headwires, and no centrifugal switch, this is how I see it working.  The main (or run winding) has a mid-tap for running at a lower speed. 

Attached Image (viewed 2555 times):

emerson 2 spd 3-wire diagram.jpg

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 Posted: Sun Jun 23rd, 2013 11:59 pm
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Dan Wyatt
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Tom,

Thanks for the post and I will look at your schematic closer later. I think I can see the relationship, but to make sure ......... can you please use my numerical wire listings of ohms coming from the stator and convert your A, B, and C to those corresponding numbers? 

Thanks ~ Dan 

Last edited on Mon Jun 24th, 2013 12:00 am by Dan Wyatt

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 Posted: Mon Jun 24th, 2013 12:50 am
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Tom Newcity
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Try this.  2 - A, 1 - C, 3 - B.

To make it easier, the yellow wire is A and the other two can go to either of the other two headwires.  One side of the AC coming from the terminal block goes directly to A and the other side to the center tap of the switch.  

To avert any serious problems with this hookup, you should have an amp meter in line to monitor current draw.  I wouldn't think that this motor would draw over 1 amp.

Hope this works for you.  I wish one of the motor experts had responded to this post, but give this a try and keep us posted.

Last edited on Mon Jun 24th, 2013 12:31 pm by Tom Newcity

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 Posted: Mon Jun 24th, 2013 09:41 pm
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John McComas
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Based on the ohm relationships I have seen before where the low speed is built into
the motor, this is my best guess...

Attachment: JMM_scan_0624201314332500.pdf (Downloaded 209 times)

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 Posted: Tue Jun 25th, 2013 03:44 am
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Dan Wyatt
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Tom and John,

Thanks a bunch for the advice and I have other projects that have come up today and will possibly get back to this one tomorrow afternoon.........again thanks for the help.

Over & Out ~ Dan 

Last edited on Tue Jun 25th, 2013 03:45 am by Dan Wyatt

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 Posted: Tue Jun 25th, 2013 12:22 pm
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Tom Newcity
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John McComas wrote: Based on the ohm relationships I have seen before where the low speed is built into
the motor, this is my best guess...

Thanks John.  So it's a shaded pole motor.  I was trying to make it more complicated than it is. 

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 Posted: Wed Jun 26th, 2013 01:41 am
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Dan Wyatt
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Thanks again.

I will wait until I can put an amp meter in line and test these wiring diagrams out.

Here are the wires before I covered them up with shrink tubing and liquid tape as shown in the picture. I think #2 yellow & #3 red are seemingly close together on the left and #1 is green. Then if I am reading John's schematic correctly they can be connected to the switch as shown in the second picture........

Tom and John .......thanks again for your wisdom. 

Attached Image (viewed 903 times):

1 colors of wire questions.jpg

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 Posted: Wed Jun 26th, 2013 01:41 am
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Dan Wyatt
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v

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4 colors of wire questions.jpg

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 Posted: Wed Jun 26th, 2013 02:32 pm
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John McComas
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I can't tell if the toggle switch is "keyed"  so that it can not rotate
in the hole in the base???  Is the base stamped High and Low?
You need to make the switch conform to high and low markings if there are any
on the base.  See picture.

Forget the wire colors, label them 1, 2, 3, in the base, after replacing the headwire,
like you did when you made the ohms measurements.
The simple way to do this is with jumpers, until you figure it out.

http://www.allelectronics.com/make-a-store/item/MTL-10/10-MINI-JUMPERS/1.html


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SPDT_Throw.jpg

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 Posted: Wed Jun 26th, 2013 06:25 pm
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Dan Wyatt
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Hi John,

Thanks again John........Yes there is a high and low on the base and I was going to wire it accordingly.

Is there any rhyme, reason, or rule for there being 2 wires close together on the left side of the stator in the picture and a lone wire on the right? 

Thanks again.......I will have to remember to buy you and Tom a cold beverage of your choice at Goeff's get-together this November.  ~ Dan 

Last edited on Wed Jun 26th, 2013 06:28 pm by Dan Wyatt

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 Posted: Fri Jun 28th, 2013 10:01 pm
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John McComas
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Dan Wyatt wrote: Is there any rhyme, reason, or rule for there being 2 wires close together on the left side of the stator in the picture and a lone wire on the right? 

Maybe.
I don't know.  I would just measure ohms like you did and tag them, jumper per
the diagram, verify it is working correctly with a Kill-A-Watt meter or amp meter.
Shift the jumpers until you get the motor working correctly, the switch handle
in the correct position according to fan base, then permanently wire it up!
Good Luck
Happy Fanning!

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 Posted: Sun Jun 30th, 2013 05:31 am
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Dan Wyatt
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John.........again, thanks a lot for all of your help. 

I have a Kill-A-Watt meter along with a bunch of fans that is coming up with a friend from Oklahoma in the near future and I will get back on this Emerson project.

Thanks again ~ Dan

Last edited on Sun Jun 30th, 2013 05:37 am by Dan Wyatt

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