Wiring a Doorbell Transformer

Hello,
I'm trying to replace a doorbell transformer, and ran into a stubmling block. Does it matter to which posts I attach the wires? The markings don't seem to match up, and just curious if it matters for the wiring? I don't want to blow the doorbell by any means, or electrocute myself. On the old transformer, the red wire is hooked into the terminal that says 16v30va and the white wire is hooked into the terminal that says, 8V20va. There is a center terminal that says Load. On the new transformer, there are 2 teminals. Is it that the original transfomer is a multi-voltage terminal, and depending on how you hook up the wires, gives you the proper voltage? The instructions with the new transformer were of no help.
Regards, Van
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old one was wired 8+16= 24v - designed for 8 or 16 or 24 volts terminals 8v + load = 8v 16v + load = 16v 8v +16v= 24v a/c transformer generally would not matter which wire is on which terminal
what volt rating is the new transformer ?

the
16v30va
is
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