Wiring the SD Controller

Initially I will use the PIDs from my brewery to fire my element, but the long term goal is to wire up a SD Controller, adding a Volt meter.
I will either use a 5500 or 4500 watt element.

My issue is, I have a 4 prong twist lock outlet in my garage NEMA L14-30, and the controller, IIRC, only needs 3 wires.

So I am not sure how or what to drop, modify, or in other words change to make it work.

Can someone shed some light on this for me?



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