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I do know what you are talking about now, the transformer has a terminal board attached to it.

If the terminals are index with a letter such as C, R,W, G, Y. The C terminal goes to the limit and...

I don't understand what you mean by "Fan Center" so if you will describe this a little better maybe I can help.

It sounds like you are wanting to know how to change from heat to AC or visa -versa,...