Question about AO Smith 2 Hp Spl 3450rpm M56 Frame 115/230 Volts Replacement Air Compressor Motor Electric Motor No.B381

2 Answers

Rewiring mootor from 230v down to 115v

I have a century pump motor, part number 8-152000-02. 2.0 hp. 3450 rpm. the motor is set on 230v and i would to change it to 115v but the wiring daigram on the cover plate is missing.
the motor is wired as:
terminals from the switch to the motor
1 white black and yellow
2 ----- -----
3 black
4 red
5 white
6 white yellow
can you help with this problem
thank you

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Not amperage draw doubles from 12 amp to 24 amp. A thirty amp circuit 10 gauge wire, will need to be wired from the breaker panel. a single 35 amp. breaker will be needed. Depending on the motor a larger circuit may be needed. Using 40 amp wire (8 guage wire) and a 40 amp circuit breaker may be required.

Posted on Oct 30, 2011

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Diagram for aosmith motor b381 is here: http://www.electricmotorwarehouse.com/IMAGES/B381_connection.htm

However, I believe that this motor will be more efficient at 230v depending on load conditions. At 115v this motor will draw more amps and tend to run hot, but situation rules. Enjoy

Posted on Dec 14, 2008

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