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Emerson 77646-AS Wiring Issue  Rate Topic 
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 Posted: Fri Aug 30th, 2019 04:04 pm
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Bruce Varner
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All, I seem to be stuck.  Cleaning up & rewiring an Emerson 77646-AS fan.  Fan worked before I took it apart.  After clean-up and before soldering in the new wiring, I am attempting to use jumpers to temporarily connect the wiring & test work-ability.  Cannot get the fan to start.
 
I have images of the wiring from before it was disconnected and can upload if needed.  I drew out the wiring before removing the old.  Below is that diagram.  When connect, the fan does not work at all.  I also have provided an image of the temporary connections I have setup.
 
1) Does the diagram seem correct?
 
2) Does not the temporary connections not also follow the diagram?
 
3) Suggestions for what else I might try?

4) Any way to "test" the condenser to see if it has failed?
 
Thanks!
Update:
<<<<<THIS WIRING IS WRONG !!!!!!!!!!!!!!!!!  SEE CORRECTED DIAGRAM, LATER IN THE THREAD >>>>>






Last edited on Fri Aug 30th, 2019 10:07 pm by Bruce Varner

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 Posted: Fri Aug 30th, 2019 05:07 pm
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Zachary Parr
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I pm you on the fan

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 Posted: Fri Aug 30th, 2019 07:49 pm
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John McComas
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Here ya go:
http://www.fancollectors.org/info/mccomas/Emer_77646-AS.jpg

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 Posted: Fri Aug 30th, 2019 08:17 pm
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Bruce Varner
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I just found this diagram.  Tracing it out now.  Will see what happens.  Thanks!

Last edited on Fri Aug 30th, 2019 09:51 pm by Bruce Varner

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 Posted: Fri Aug 30th, 2019 10:08 pm
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Bruce Varner
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Funny how electrical items actually work, when you wire them correctly…………………  I had the fan improperly wired.  Not sure if I was not careful enough during disassembly, or I misdiagnosed dirty stator wire colors, or a combination of the two.
 
Thanks to John McComas for pointing me in the direction of a diagram for this fan, and to Greg Hylton for providing some offline support.
 
I was able to clean off the old wiring to discover the correct wire colors and do some comparisons.  My original diagram of how I believed the wiring should go was wildly in correct!!!!!!!
 
Below is the updated, corrected, and easier to follow diagram.  As I stated above.  Things actually work when connected to the right points………………..
 
Thanks to all who responded, and helped me resolve the issue.  Hope this helps others in the future that have similar issues.





Last edited on Sat Aug 31st, 2019 02:58 am by Bruce Varner

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 Posted: Fri Aug 30th, 2019 11:25 pm
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Lane Shirey
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Actually, the polarity of the AC in should be: the hot through the switch and the neutral to the headwire . You have them reversed in your drawing and that could leave the chassis hot. 

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 Posted: Sat Aug 31st, 2019 02:59 am
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Bruce Varner
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Yep, another correction.  I have changed the last diagram to reflect switching the hot wire, not the common.

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 Posted: Mon Sep 2nd, 2019 12:42 pm
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John McComas
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Glad you got it going Bruce!  That Emerson model is one of the most efficient air mover designs! :up:

Rule of thumb around here is to forget color coded wiring!  That only seems to work for telephones! :shock:

Most always with PSC motors (permanent split capacitor) the low resistance winding is the main winding,
and the high resistance winding is the auxiliary winding, where the capacitor is used.

Think of them as two separate circuits...  the main has the speed coil in series with the power,
and auxiliary is with the capacitor to create the phase shift to get the rotor turning, and also maintain
efficient running.

Referring to your latest diagram, the red circuit is the phase shift and the green circuit is the main.

If you remember the above, you can work on PSC motors even if you are color blind! :D :D :D
Happy Fanning!

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 Posted: Mon Sep 2nd, 2019 01:58 pm
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Bruce Varner
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Thanks John!  Yes, got that information offline and used it to make the determination.  Later cleaned the wires to the stator and found the colors.  Great information!

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