I have heard it said that a ceiling fan with a built in three speed manual switch should be set on the high speed setting when using an electronic speed control. I have not found an answer as to why this is. Is this a true statement or can the manual switch be set on a slower speed and also have the electronic control set to a lower speed as well?
If the manual switch is set to the slower speed, then the electronic control will only be able to increase the speed up to that lower speed. If the manual switch is set to the higher speed, the electronic control will be able to adjust the speed over the entire range.