Hi Drew,
Here is a page with details:
http://www.hammondpowersolutions.comDrewE wrote:
I suspect there are not two taps, but rather that 32V boost comes if you use it in a 240V circuit and 16V in a 120V circuit.
By the way, I suspect the barn is well over 40 years old. A subpanel in the mid 70's would not typically have screw-in fuses, and a large barn built at that time likely would have had more than a 30A 240V service installed. (At least in this part of the country, an old barn is more like 100 or 150 years old and built with post-and-beam construction.)