Mt. Vernon original 4 speed board dial

[tmeric7]

Hello, surprised I can't seem to find the answer to this question...

On the side of my 4 speed control board, there is a dial that can be set from 0 - 7. What is this?

I'm troubleshooting missed ignitions (crossed a lot off the list) and wonder if this could possibly be related. Thanks!

 

[tmeric7]

For anyone coming across this in the future... I found the answer to my question. It deals with feed rate, which I suspected. This is a model selection switch that tells the board what stove it's in and whether to adjust the feed rate based on kind and quality of fuel.