That's not my board, that's the old ERR board that hasn't been made in years.
If you want real chuffing smoke, smoke at idle, and even Rule-17 LED headlight and automatic cab light control, consider my product. Super-Chuffer II.
Here's the instructions for the ERR board you have: ERR Smoke Fan Chuffer Install Notes.pdf
Here's the schematic of that board, as you can see, it's just a power supply and a couple of transistors to isolate the chuff switch from the fan.