"new" welder help, auction find Airco 300
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  1. #1
    Join Date
    May 2010
    Location
    Sparks, NV
    Posts
    5,285

    "new" welder help, auction find Airco 300

    Just got this at auction today and have not wired it up yet. I found a few threads about them.
    This one seems to have all the bells and whistles. I did read all the related threads I could find but none seemed to have any info on the control unit for the spool gun
    Model 3S/DDR-224 HPA/B-D
    Stock # 1341-0118
    Serial # HH61095 (can anyone decipher the manufacture date?)


    Aircomatic Control (would really like some more info on this part. does have a contactor inside.. the spool gun wires up like the Profax I have does to the Miller S52e...
    Model ACH-L
    Serial #2051

    MIGet Spoolgun
    Model AH20-E


    Airco Foot Pedal
    Model RFC-23A


    Water cooled torch and external pump which looks like one end draws from a bucket and the other just returns the water back

    about 50' of welding cable on the stinger and 25 or so for the ground.
    It came from a Diesel repair shop that closed/retired owner I think. Have not had a chance to wire it up or take side off to clean it but hopefully it works. looks like it was direct wired. What attracted me to this machine is that its a really heavy duty single phase machine.... I will be adding a dedicated 100 amp panel to the garage next month.
    Oh and got it all for $150 Which is a steal any way I see it... I will post once I get it (hopefully) working... I did download the Miller 330 BPA owners manual as it seems to be the same machine.

    Thanks in advance for any more info on these.
    4 Sale: GoWeld $395obo
    Demo machine: AHP200X
    MM350P w/ Spoolmatic 30A
    ESAB 300AVS
    Everlast PowerTig 185
    ESAB 875 plasma
    Evo 355. OA

  2. #2
    Join Date
    Oct 2009
    Location
    Palmer, Alaska
    Posts
    1,188

    Re: "new" welder help, auction find Airco 300

    nice deal, i only paid $100 for mine, but mine didn't come with the pedal.i run mine on a 50a breaker with no problems, but i have also never gone over 50% output anyways.
    Dynasty 200DX
    Passport plus w/ spoolmate 100
    victor 315c oxy/(act and prop)
    Miller digital elite
    milwaukee power tools

  3. #3
    Join Date
    May 2010
    Location
    Sparks, NV
    Posts
    5,285

    Re: "new" welder help, auction find Airco 300

    Quote Originally Posted by turk View Post
    nice deal, i only paid $100 for mine, but mine didn't come with the pedal.i run mine on a 50a breaker with no problems, but i have also never gone over 50% output anyways.
    Yeah I think they are worth more than what we paid in scrap copper. as I have an identical spool gun already I figured it was worth it just for the parts.
    4 Sale: GoWeld $395obo
    Demo machine: AHP200X
    MM350P w/ Spoolmatic 30A
    ESAB 300AVS
    Everlast PowerTig 185
    ESAB 875 plasma
    Evo 355. OA

  4. #4
    Join Date
    May 2010
    Location
    Sparks, NV
    Posts
    5,285

    Re: "new" welder help, auction find Airco 300

    Ok, got it cleaned up and hooked up and auxillary stuff seems to work, but no welding current AC or DC, I did try all ranges and current modes. Suggestions on what to check or where to start looking?
    Does this have a main fuse or contactor for striking up the arc current?

    On a side note, I figured out the box the tig pedal was in, is actually the bottom to the airco tig cooler pump duh!,, does this just get filled with a coolant/water mix
    Last edited by soutthpaw; 05-02-2011 at 12:35 PM.
    4 Sale: GoWeld $395obo
    Demo machine: AHP200X
    MM350P w/ Spoolmatic 30A
    ESAB 300AVS
    Everlast PowerTig 185
    ESAB 875 plasma
    Evo 355. OA

  5. #5
    Join Date
    May 2010
    Location
    Sparks, NV
    Posts
    5,285

    Re: "new" welder help, auction find Airco 300

    Got it working Took top off and cleaned all the contacts on the switches. seems good to go now.
    4 Sale: GoWeld $395obo
    Demo machine: AHP200X
    MM350P w/ Spoolmatic 30A
    ESAB 300AVS
    Everlast PowerTig 185
    ESAB 875 plasma
    Evo 355. OA

  6. #6
    Join Date
    Aug 2009
    Posts
    4,272

    Re: "new" welder help, auction find Airco 300

    You got a screaming deal! Congrats.

  7. #7
    Join Date
    May 2010
    Location
    Sparks, NV
    Posts
    5,285

    Re: "new" welder help, auction find Airco 300

    Haven't tried the TIG yet, need some electrodes for it. Just finished running 2 ga triplex to garage and installing sub panel with 100 amp breaker.

    Need to solve a weird problem I have with identical spoolguns on 2 different machines with 2 different controllers.

    Neither feeder motor will run when i depress the trigger even though the contactor on both units is closing and its getting welding current to the wire. The Airco MIGet will run the motor using the JOG button on the bottom of the handle. and it will strike and maintain the arc. it hooks through the Airco control box I mentioned above...

    The Profax gun I got connected to the Miller WC-3 is having the same issue but the miller does not use the JOG button so I removed and tested the motor to verify its good....

    I cannot make sense of the wiring diagrams to trace where the signal to run the motor finds is way back to the gun and also don't understand how the wire speed control signal gets routed, processed
    4 Sale: GoWeld $395obo
    Demo machine: AHP200X
    MM350P w/ Spoolmatic 30A
    ESAB 300AVS
    Everlast PowerTig 185
    ESAB 875 plasma
    Evo 355. OA

  8. #8
    Join Date
    Feb 2011
    Location
    South Plainfield NJ
    Posts
    697

    Re: "new" welder help, auction find Airco 300

    Remember the welder is a rebranded Miller . the Profax and Airco are also the same , should hook up the same too . John

  9. #9
    Join Date
    May 2010
    Location
    Sparks, NV
    Posts
    5,285

    Re: "new" welder help, auction find Airco 300

    Quote Originally Posted by Pavinsteelman View Post
    Remember the welder is a rebranded Miller . the Profax and Airco are also the same , should hook up the same too . John
    Yep I downloaded the 330 owners manual already. Think I need to call Profax and find out to how to trace the problem
    4 Sale: GoWeld $395obo
    Demo machine: AHP200X
    MM350P w/ Spoolmatic 30A
    ESAB 300AVS
    Everlast PowerTig 185
    ESAB 875 plasma
    Evo 355. OA

  10. #10
    Join Date
    May 2010
    Location
    Sparks, NV
    Posts
    5,285

    Re: "new" welder help, auction find Airco 300

    Got both spool guns working with a bit of help from Glenn at ProFax. relay on the airco that is powered by the current thru the electrode welding cable had too wide of a gap. the WC3 controlled gun had a bad contact in the the RC-3 relay and also had to change the high/low OC circuit voltage setting
    Miller WC-3
    High= jumper across terminal 10& 24 = CC power source = Aluminum only= DCRP
    Low= jumper across terminal 17&24 = CV power source = Aluminum and steel = DCRP

    That's what he told me.
    Anyone know why you cannot weld steel with one of these guns running a CC power source????
    4 Sale: GoWeld $395obo
    Demo machine: AHP200X
    MM350P w/ Spoolmatic 30A
    ESAB 300AVS
    Everlast PowerTig 185
    ESAB 875 plasma
    Evo 355. OA

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