There should be two of these hanging on the hooks:
And one of these hanging at the top of the firebox:
CoalBurner5 wrote:I just don't understand why the stoker would run everytime that the pumps are triggered to run.
That is how the aquastat is designed, when there is a heat call (contract across the TT terminals or 120v to ZR terminal) the stoker will run until the boiler reaches the high limit. If your boiler never reaches 190, then the stoker will start whenever there is a heat call.
I am wondering if your coal is not so great. If you were running 4 teeth of feed before, the stoker would have to run 24 hours per day to generate two full tubs of ash...and even then the ash content would have to be greater than average.
At this point, I am out of ideas. Get a real EFM pro to stop by and look at the boiler, stoker, piping, and control strategy.