The FL-2100B primary taps can be easily set for 234v operation. Although not specifically indicated in their wiring diagrams, it can be done.
I have my FL-2100 wired this way... works great.
See the pic (and attachment) of the OEM diagrams with an amendment for the 234v wiring arrangement (I made this change on my schematic).
73,
~Alan
W5ARM
Alan - W5ARM