Update
The 416V transformers feed GE panel boards rated for 480/277. The single pole breakers are rated for 277V.
My concern here was I have never seen an air conditioning unit fed with a 240 hot and a neutral. The PTACs are all by GE so I have a call in to them.
A majority of the PTACs have been in service since 1989,so I am really wondering if I have been worried about nothing.
