Help wiring my dual voltage Chinese welder

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I have a Mitech MTC130D welder. I bought this welder back in 2007 from eBay.  It has tig, plasma cut and Arc welding all in one.  When I bought the machine it came without a plug and do remember installing a 110V plug on the machine. I have used the machine since 2007 with 110V. I’m moving my shop to a new pole building next to my house and I’m planning out the electric.  I noticed the machine says 220v input, the label on the back gives spec for both 110V and 220v. I can’t find the manual, and Mitech does not have any history of this machine.  They did tell me the D in the model number does mean dual voltage.  They said I can hook up to 220v and recommend it to get full capacity from the machine.  They also told me they can not advise me on how to wire it since they don’t have any documentation on the machine.  If I hook this up to 220v will the inverter automatically detect the voltage and adjust?  I see no jumpers inside or any wire diagrams.

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Reply:Are the red, blue and yellow/green wires in the second picture coming from the source(receptacle)? Could it be that the adapter cord is absent? I would think that internal connections would be done on a terminal block.IMPEACH BIDEN!NRA LIFE MEMBERUNITWELD 175 AMP 3 IN1 DCMIDSTATES 300 AMP AC MACHINEGOD HELP AMERICA!"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.” BENJAMIN FRANKLIN
Reply:

Originally Posted by CAVEMANN

Are the red, blue and yellow/green wires in the second picture coming from the source(receptacle)? Could it be that the adapter cord is absent? I would think that internal connections would be done on a terminal block.
Reply:It would be a guess 🤔.  Can you post a wiring diagram of welderhttp://www.mitech.cc/product.asp?ClassID=001004Dave

Originally Posted by matridium

I have a Mitech MTC130D welder. I bought this welder back in 2007 from eBay.  It has tig, plasma cut and Arc welding all in one.  When I bought the machine it came without a plug and do remember installing a 110V plug on the machine. I have used the machine since 2007 with 110V. I’m moving my shop to a new pole building next to my house and I’m planning out the electric.  I noticed the machine says 220v input, the label on the back gives spec for both 110V and 220v. I can’t find the manual, and Mitech does not have any history of this machine.  They did tell me the D in the model number does mean dual voltage.  They said I can hook up to 220v and recommend it to get full capacity from the machine.  They also told me they can not advise me on how to wire it since they don’t have any documentation on the machine.  If I hook this up to 220v will the inverter automatically detect the voltage and adjust?  I see no jumpers inside or any wire diagrams.
Reply:I'm no electrical wizard, but that second pic you provided looks like a dual voltage auto switching pcb. With no user manual, guess away.  Maybe someone who's an electrical engineer may answer up
Reply:If I was in front of the welder it not take long.But trying to do over the internet is hard to do without a wiring diagram.But if look at the third photo you see a 220 input that may give the answer. Need a bigger photo 📷Dave

Originally Posted by kize

I'm no electrical wizard, but that second pic you provided looks like a dual voltage auto switching pcb. With no user manual, guess away.  Maybe someone who's an electrical engineer may answer up
Reply:Here is a larger picture of the pc board

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Reply:More pictures

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Reply:Need bigger view of last photo. Sorry I edit the post. Dave

Originally Posted by matridium

More pictures