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IndustryArena Forum > MetalWorking > Welding Brazing Soldering Sealing > Airco 300 Heliwelder IV Need to know Proper wiring
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  1. #1
    Join Date
    Sep 2008
    Posts
    3

    Airco 300 Heliwelder IV Need to know Proper wiring

    I have a old Airco 300 Heliwelder IV machine. I have just ordered a new reactor pwb for replacement and apprehensive to power the unit up. I need to know what color wires go to the 25 Amp bridge rectifier mounted directly above the reactor board. There are four wires, colors are blue, white, red & black. I know the white & blue go to the AC terminals. Does anyone know the correct wiring for the red & black leads? I have a picture of the wires in question. If anyone knows some type of an answer, I would greatly appreciate your comment or suggestions.


    Thank you for your time.
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  2. #2
    Join Date
    Jul 2008
    Posts
    24

    Bridge wiring

    Black is positive+ and red is negative-, just backwards of what you would think.

  3. #3
    Join Date
    Sep 2008
    Posts
    3

    Airco 300 Heliwelder

    Thank you for your reply. I just needed to confirm the wiring before I power the unit up. The picture shows what you have said. This must have been a mistake at the factory during production or it must have been made overseas.

    Thanks again!

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