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Emerson exhaust ventilator wiring help needed  Rate Topic 
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 Posted: Sat Sep 9th, 2017 02:09 pm
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Lucas Beshara
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We have a 4 wire head wire 2 speed emerson fan we are working on and wondering how to hook up with 2 speeds and switching between the 2.  It sounds like it has a start switch, as we have hear it clicking on and off. The fan won't start on it's own though. And one of the wiring combos is pulling high amps when hooked up. (2.8).  And the other reads at rated (1.8) but we have to push start. Below is the fan motor tak and ohms between the 4 head wires






















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 Posted: Sat Sep 9th, 2017 02:53 pm
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David Allen
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Lucas Beshara wrote: We have a 4 wire head wire 2 speed emerson fan we are working on and wondering how to hook up with 2 speeds and switching between the 2.  It sounds like it has a start switch, as we have hear it clicking on and off. The fan won't start on it's own though. And one of the wiring combos is pulling high amps when hooked up. (2.8).  And the other reads at rated (1.8) but we have to push start. Below is the fan motor tak and ohms between the 4 head wires





Hi Lucas.  That is a really nice looking fan. It also looks to be in very good shape.

As for the motor, I would have to have a similar motor to "figure out" the wiring. Hopefully someone else has one which they know the correct wiring for. 

Have you taken any pictures of the motor, with an end cover removed? Knowing if there's a centrifugal switch (and if so, is it damaged) would be very helpful.

I believe Ryan Nguyen has an Emerson exhaust fan that he has repaired. Yours looks a little different, however his findings could prove helpful. http://www.afcaforum.com/forum1/44651.html

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 Posted: Sat Sep 9th, 2017 03:25 pm
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Chris Kelly
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i have the same fan but rated for 220v and i have the same issue of not knowing which wires are for what

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 Posted: Sun Sep 10th, 2017 12:45 am
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Lucas Beshara
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We did end up figuring this one out once we got it disassembled. Once we found the start switch wire then it was a typical 3 wire head wire and we just needed to find the high medium and low wires to pinpoint the common wire between the high/low main windings. From there we had the common wire going to power and we spliced the low and start together for low (1.3 amps). For high we spliced the start and high to one side of power and the common to the other (1.8 amps).  I'll have to find a switch to go from high/low/off
Such a well built fan with ball bearings and super stout design!













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 Posted: Sun Sep 10th, 2017 01:32 am
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David Allen
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Lucas Beshara wrote:
We did end up figuring this one out once we got it disassembled. Once we found the start switch wire then it was a typical 3 wire head wire and we just needed to find the high medium and low wires to pinpoint the common wire between the high/low main windings. From there we had the common wire going to power and we spliced the low and start together for low (1.3 amps). For high we spliced the start and high to one side of power and the common to the other (1.8 amps).  I'll have to find a switch to go from high/low/off

Such a well built fan with ball bearings and super stout design!




Excellent work there!  That motor does look like it's very well built. The only thing that (from the pictures) looks like it could use some attention is the winding varnish.  It looks like the coils are very thinly varnished if at all. I would coat them heavily to seal, secure, and preserve them. 

Interesting wiring scheme. That makes sense though. The switch will have to be a double-pole double-throw with center-off.

If I understand correctly how you described it, this could be your 2-speed setup:


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 Posted: Sun Sep 10th, 2017 02:14 am
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Lucas Beshara
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Thanks for the schematic  David!  That looks right as long as the connections when u throw the switch are 1-2-4 and 3-5-6. I'll have to get that switch and give it a shot. 
And yes I'm gonna pull the stator and give it a revarnish, cleaning, etc. may have a start winding issue but have connectivity so I don't know yet. Revarnish could solve a few issues.  :up:

Last edited on Sun Sep 10th, 2017 02:18 am by Lucas Beshara

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 Posted: Mon Sep 11th, 2017 04:14 am
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Kevin Massey
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Hi Lucas. It sounds like the start winding wasn't working and maybe trying to start on the main winding. I've seen motors that ran and the start switch didn't open up. That pulled high current. Nice fan and good luck. Looks like you got it handled.

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