Mystery ESL 1500

Hi I have had this thing sitting in my closet and I don’t know how to wire it or do anything with it really. Also why does mine look different from the images online. I can provide more photos if anyone wants them.

Yours does not have any zone cards, that’s why: 1500s come with one zone by default, so that’s what yours has at present. As for the wiring, this diagram might help you with it.