PID controller wiring schematics

After the wiring schematics for the PID controller I use? 

I use this PID to sterilize 500kg of substrate at once. It connects into my home made boiler, and runs perfectly. 

The current setup has a 4.5kw element. 

This does NOT contain the parts list. Your own parts will need to be sourced in the country you live in. This schematic is for educational purposes only, and professional advice should be sought prior constructing any high power devices.