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Airco 300 Heliwelder IV Continuous Post Flow

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  • Airco 300 Heliwelder IV Continuous Post Flow

    I have an Airco Heliwelder IV, 300 AMP; serial #MG912011 that is exhibiting continuous post flow regardless of the post flow or other panel settings. I have tested with and without the remote, no change. After review of the troubleshooting guide in the owner’s manual, I replaced the post flow potentiometer (w/ Honeywell Clarostat RV4NAYSD105A) which did not cure the issue. It appears the potentiometer may have been changed previously and I’m suspect of the timer as well ((#CLF-41-30060) 24v). I can't see any movement of the contact - they to stay in the middle position. Can anyone provide insight into curing this problem? I can provide further details related to the current installed components as well as photos.

  • #2
    I have been hunting for a manual on the 300 Heliwelder and was wondering if there is a possibility of getting a copy of yours???
    You can email me at [email protected] if you are so inclined.
    Thanks in advance.
    Bill
    With the proper motivation & given enough time anything can be fixed

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    • #3
      Best thing would be if you could post a readable copy if the schematic from your book.

      Miller made a lot of the Airco welders, but not all. Couldn't find anything under those numbers on their site. Might be Esab?
      Last edited by Aeronca41; 11-04-2016, 08:02 AM. Reason: Added info

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      • #4
        Here is schematic of my Heliwelder IV - 1341-0176
        Miller Dynasty 350, Dynasty 210 DX, Hypertherm 1000, Thermal Arc GTSW400, Airco Heliwelder II, oxy-fuel setup, metal cutting bandsaw, air compressor, drill press, large first aid kit, etc.

        Call me the "Clouseau" of welding !

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        • #5
          Unfortunately with the (lack of) ability to post photos to this forum with any degree of success, it is unreadable when enlarged above postage stamp size. Thanks for the attempt.

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          • #6
            Have you tested the solenoid that controls the gas flow? Its quite possible that its stuck open. Try to determine the solenoid valve coil voltage, apply it and see if anything happens.
            Last edited by fcanaan; 11-07-2016, 11:19 AM.

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            • #7
              Click image for larger version

Name:	Airco 730x730.jpg
Views:	313
Size:	304.4 KB
ID:	574521 Resized photo of schemetic - hope it is useable. -
              Attached Files
              Miller Dynasty 350, Dynasty 210 DX, Hypertherm 1000, Thermal Arc GTSW400, Airco Heliwelder II, oxy-fuel setup, metal cutting bandsaw, air compressor, drill press, large first aid kit, etc.

              Call me the "Clouseau" of welding !

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              • #8
                Are you getting preflow? Do you have preflow on? Is the torch outputting gas as soon as you turn on the bottle or only after you stomp the pedal?

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                • #9
                  Originally posted by fcanaan View Post
                  Are you getting preflow? Do you have preflow on? Is the torch outputting gas as soon as you turn on the bottle or only after you stomp the pedal?
                  Good question. Please provide more detail of exactly what happens fron power on through attempts to weld. Was able to print out a readable copy of the schematic.

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