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Verfiying Fan Connections With A Wiring Diagram


By Dave Rongey - Summary:

How to Verify Fan Motor Wiring Connections: Checking the Motor and Capacitor Connections.


Guide for Wiring a Table Fan Motor with Capacitor

Electrical Question: I am rewiring a Table Fan Speed Control Switch.

  • I have a Bionaire brand table electric fan.
    • It has a 3 speed fan motor.
    • The electric motor is a BM-122 Decomin brand 3 speed motor.
      • There are 6 wires:
        • Red wire.
        • Black wire.
        • White wire.
        • Yellow wire.
        • Gray wire.
        • Blue wire.
          • The motor has a 4mu 250volt capacitor.
  • This fan has an oscillating grill with independent sync motor, and timer circuit.
  • Something was wrong with the solid state circuitry (everything worked but the motor!), but a quick test of the motor indicated it does work.
  • The motor uses a start and run capacitor.
  • I decided to change controls to a simple mechanical switch and fore go for now anything beyond 3 speeds.
  • The printed circuit board shows the following connections:
    • Black wire
    • Blue wire
    • Yellow wire
      • Are respective for the:
        • High fan motor speed
        • Medium fan motor speed
        • Low fan motor speed
  • I think the gray wire goes out to the oscillator motor.
    • The Red wire is marked as Line, for the power source.
  • All wires are in continuity with each other EXCEPT RED is not with any other wire.

I see you’re a contractor, so this question might be a little out of your ballpark, but might you help me figure out how to direct wire to a mechanical switch.

Thanks.

Background: Eddie, a Homeowner from Houston, Texas.

Dave’s Reply:
Thanks for your electrical question Eddie.

How to Verify Fan Motor Wiring Connections

  • Checking the Motor and Capacitor Connections
  • Double check your connections using the fan wiring diagrams.
  • You should see that there is a separate motor winding for high speed.
    • The concern is that there is a capacitor for the motor.
    • So I’m thinking that the motor may have to start with the slower speeds first.
    • and not start in the high speed because the motor or capacitor has not been designed for that type of operation.

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2 Responses to “Verfiying Fan Connections With A Wiring Diagram”
  1. ramanathan says:

    I would like a wiring diagram showing a meter board connection.

  2. charles williams says:

    I have a Airtech pedestal fan. It runs with a capacitor, but I’m not sure where these wires go not sure which 2 are the capacitor wires and not sure which ones are the switch wires. There are 2 blue wires, 1 white, 1 black, 1 yellow and 1 red. Airtech fan Model FS22-40.


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