Heater element wiring

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Greetings experts. We have a set of Fire Wire heater elements that appear to be 240VAC, since the data sheet is depicting as such. However, the electrical panel only has 480VAC going to it. The heaters are working. How would a 2-wire, 240VAC element be wired to work on 480, 3P power?
Watlow fire wire.jpg
 
So one wire terminated to L1, and the other terminated to L2, of the 480 3P power?

Huh? that is not "series".
One lead from heater A to L1
One lead from heater B to L2
The other leads from A and B together.
Ok. I think that is how they have it wired now. Wired that way, actual voltage to the heater element would be ?? 240V since its only one leg, correct? What if there was only one heater? Where would that lead go to, or would it just not terminate anywhere and just wire nutted?
 
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