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Replies:
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| sinead26ohara
 |  "Re(1):Blower turns on briefly, then off."
, posted Wed 3 Sep 21:08  
Okay, this is going to sound crazy, but you haven't inadvertently replaced a 230 volt motor with a 110 volt motor, have you?
Sinead O'Hara
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| | tythan
| "Re(2):Blower turns on briefly, then off." , posted Wed 3 Sep 21:43
Nope, the motors are the same voltage. It is the proper replacement for this furnace.
I should know more tomorrow because I have a professional coming to have a look.
Thanks
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| yuri
| "Re(1):Blower turns on briefly, then off." , posted Mon 25 Aug 20:08
Is the motor getting excessively hot? Did you connect the wires the same as the original?
Yuri
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| | Tythan
| "Re(2):Blower turns on briefly, then off." , posted Mon 25 Aug 21:13
The motor does not get hot. It does not go long enough to get hot.
The wiring is a bit complicated. When I took the bad motor out I noted where the wires were connected. That document is now lost. When I replaced the new motor I connected the wiring as per the manual and the motor did not run. But I am quite sure the manual is different than the notes I took. I then moved one of the wires to what I remembered. This is when the motor started for 8 seconds.
Also, the original motor had 4 wires: black, bue, red, white. The new motor has a yellow wire, not white. I was assured that this is the proper replacement motor.
Thank you
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| | yuri
| "Re(3):Blower turns on briefly, then off." , posted Tue 26 Aug 17:02
I had one of those AO Smith motors and I believe the yellow is actually the neutral (white). Try get the OEM motor and use it instead. Sounds like a messed up wiring issue and we cannot easily solve it w/o seeing it.
Yuri
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| | tythan
| "Re(4):Blower turns on briefly, then off." , posted Mon 1 Sep 19:14
Yuri, sorry for the delay, and thank you for the help.
The OEM motor does not work at all. You are correct, the yellow wire is the neutral.
I was able to get the motor working by changing some of the wires. Here is what I have determined:
Yellow is neutral and can be connected on any of the neutral connections.
Black connects to either 'cont' or 'cool'. Fan works on either, but cool is best because cont is continous.
Blue goes on either 'hum' 'heat' or 'eac'. The fan only goes on when the blue wire is connected to 'hun'.
Red goes on either 'm1' or 'm2'. Does not seem to matter.
So.... the fan works properly when the termastat is in the 'off' or 'heat' position. The fan will not come on is the termastat is on cool. The A/C unit comes on, but the fan does not come on to blow cool air.
I understood that when the black wire is on 'hum' that the fan would only come on when the termastat was on 'off' or 'heat'. That the black wire has to be on 'eac' for the fan to come on for the 'cool' setting. But it does not.
It is a 3 speed motor and I found many different wire configurations for the different speeds. But I can only get the motor/fan to work with yellow(neutral), red(m1 or m2), black(cool), and blue(hum).
The motor is AO Smith Blower Motor 1/3HP; 1PH 115vac; 1075 3SPD; 48Y Frame.
Run Capacitor is 7.5uf; 370V.
Long post, sorry. A lot og information.
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