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Thread: Motor Grounded
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07-13-2012, 11:55 PM #1
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Motor Grounded
Go to a w/i freezer call to find a frozen over coil. I put the timer into defrost and find one of two evaporator fans running half speed (208-230) and the other full speed. Solenoid valve still energized so no pump down. Compressor still running.
Long story short........ends up that the grounded motor (one running half speed ) was sending voltage back to the second ones dead side ( because the clock was in defrost mode and opens that side of the motor ) therefore allowing it to get the 208-230 voltage. Also grounded that first motors common side giving it half voltage. The feedback was powering up the open side of the solenoid as well. I went back with a new motor and everything worked as normal. Why do some calls have to be so difficult ?
P.S.
When I pulled the motor & bracket out, it was sparking where it mounts.
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07-13-2012, 11:59 PM #2
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Wow! Tricky one! Good diagnostic work!
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07-14-2012, 12:07 AM #3
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Funny thing is the whole time I wanted to blame the last tech. Thinking what fool wired this thing.

I need to be less quick to blame and think more on the job at hand.


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