Here is a photo and a repost of the connection diagram. Note the unused
center terminal at the top and at the bottom. Primariy connections are at
top an can be seen in the photo.

I'm glad you are the one working all this out, I would like to see more
information on the construction of the transformer and the disposition
of the windings before speculating too much. If the transformer is of
open frame construction and is not potted, the OP should be able to
easily determine if an E-core is used and if all the windings are on the
center leg?


Regards,

John Byrns

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