If you try to even cut with the SC50, without air, you will likely damage your machine...and do so instantly. This unit does not have a low air pressure shut down feature...because it is a price unit. The PP50 does and will keep you from making this mistake. You cannot make an arc without air.
Unless you live in a 0% humidity environment, you have water/moisture issues. It is very sensitive to water...
BTW, have you downloaded the manual and read it? I believe this information is covered.
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