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Bad Transformer?Or capacitor?  Rate Topic 
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 Posted: Tue Jan 2nd, 2018 05:03 pm
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Nathan Nolan
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Joined: Mon Dec 25th, 2017
Location: Raleigh, North Carolina USA
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With the new hobby setting in I just got an Emerson Electric 77646-AS model and it was in some pretty bad condition.Cost me a pretty penny but I rand the stator thru and it showed to be good.I wired it up and the switch after some cleaning and used this diagram.I will post some pictures up asap but After checking and wiring it up and I bypassed the capacitor (as shown on the wire A circuit) and checked my switch and the switch seemed fine...But then plugging it in it would just hum.I tried giving it a spin.Still would just hum.Finally after multiple attempts I took it apart and checked my resistance and even cleaned and soldered wire C and A to the switch there.Still same thing.

Finally after multiple attempts after I hooked it all back up and it hummed I cut the red wire while it was live and the fan with a very hard and fast push suddenly spun and then slowly wound down and stopped.And with a hard enough push would continue to spin.But as soon as the red wire as reconnected it would cut off.So after I cut that red wire it just seemed like the motor was weak and having trouble even trying to start or barley turning.

So Im guessing wire A is a shut off winding?Then B and C are the main winding?Does this have something to do with me bypassing the capacitor?If so why is the capacitor hooked to the shut off wire?

Any questions answered or ANY info would be MUCH appreciated and thanks guys!

Attached Image (viewed 133 times):

Emer_77646-AS.jpg

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 Posted: Tue Jan 2nd, 2018 08:03 pm
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Lane Shirey
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The cap must be in the circuit for it to run. It's quite possible the cap is bad. Only by testing it can you tell. You will need a multimeter with a capacitor test function. Or you can just replace it and see if that does it. 


There is no stop circuit. What you have there is a run (main) coil and a start (auxiliary) coil and the third wire is the common of both coils. Using the ohm readings from each of the 3 headwire pair combinations, the headwires can then be connected correctly per the drawing. 


As you can see from Tom's schematic, take the pair that gives the highest reading, and that's the reading through both coils. Set the third headwire aside, that's the common. Then measure from the common to each of the other wires to determine the start and run coils. The headwire with the higher reading to the common is the start coil, and the lower reading is the run coil. 


Once you have each wire figured out it should match the drawing above. 


Oh, and I find it's best to continue the thread you started originally for the fan rather than starting a new thread for each question. It helps us to follow the whole chain of events. Something that was mentioned earlier might be relevant to your current question. Otherwise it's hard to follow sometimes. Just my suggestion. 


Last edited on Tue Jan 2nd, 2018 08:10 pm by Lane Shirey

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 Posted: Tue Jan 2nd, 2018 10:12 pm
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Nathan Nolan
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Ahhh I see so the red wire out must be the starting coil and yellow and brown must be aux and running.Thanks!

And sorry about that.Im a bit new to forums ill do that next time!

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 Posted: Fri Jan 5th, 2018 03:04 pm
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Lawrence Smith
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https://www.ebay.com/itm/CAPACITOR-CBB61-450VAC-1-5uF-HVAC-1-5-MFD-FAN-MOTOR-START-WW-/142636903999?hash=item2135d26e3fthis is a replacement capacitor that most people use-- cheap & easy to replace.

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