{Collins} 30L-1 - convert between 115V and 230V

I have three 30L-1 amps, two wired for 115V and one wired for 230V.  I can discern absolutely no difference in the performance, and it'll be more convenient if all three are wired for 115V, so I'm converting the 230 back to 115.

I have this vague recollection that there was more to the conversion to 230 than just changing the jumpers on the power strip.  Someone on one of these reflectors had come up with a recommendation to do X in order to prevent some bad thing from happening.  But, I can't find, or remember, the details.

Ring any bells with anyone?


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