Tim: I have the same welder, tho mine is the Cetury 250 Amp AC-DC output. Yours is a 295 amp AC only output.
you have 2 AC ranges- LOW & HIGH The LOW range has more arc volts for small rods, and hard to run AC rods like Low hydrogen 7018, stainless and hard surfacing. High range is for all dia 6011,6013/7014/7024 rods.
They were made in the 1980's, and yours looks to be in beautiful shape, used very little. They are very tough welders that give long touble free service. Base on how expensive new welders are today, YOU GOT A GREAT DEAL!. You will need a to wire it for 240Volt-60 amp [min] input. Mine will trip off a 50 amp breaker, if I weld over 145 amps. I had to install a 60 amp breaker to weld up to 225-250 amp. It will pop that if you weld more than the duty cycle of the welder[2mins, out of 10mins] Also, you need to use a #6 input wire size. Do not go over 30ft [both welding cables] use #2 welding cable[too long will cause voltage drop = hard arc staring.
Always lengthen the input power cable, not the output welding cables on Transformer type welders.