Crazy new-fangled gadgets!!
With the massive chimney here no amount of messing with the timer prevented out fires in the summer. It stays the same now, about 2 minutes once an hour. When I see a cold morning followed by a warm afternoon in the forecast, or when we get into the Summer months I switch on the draft inducer. It has been shut off for quite some time now.
In the photos it looks like I have it set for under 2 minutes, but that printed scale is not accurate. Actual run time is about 2 min. 10 sec.
The timer will run the stoker regardless of what's going on with calls for heat, etc., as stated, unless the boiler is at or above the high limit setting.