Rob R. wrote:Nice looking EFM. I suspect the unburned coal you are observing is due to lack of demand, and the coal itself. Some coal does not burn completely when the stoker just runs on the timer, and there is the possibility your coal quality is not great.
I do not recommend running the feed at less than 4 teeth. 4/4 is a great setting for these stokers, and if the unit doesn't overheat I would just leave it there. 150/200 is fine, timer setting of 2-2.5 minutes every half hour is fine also. -.02 of draft at idle should be plenty, that is what mine runs...sometimes a little less in the summer.
It is a shame you aren't producing domestic hot water with the boiler. It would reduce your electric bill and give the unit some additional run time to keep the fire happy. In small houses, the btu load from domestic water often exceeds the heating load.
Thanks for the reply Rob. Yeah, I'm running bagged Reading coal and with these warm days it really runs on the timer all day and a little at night. I have a log house so it soaks up heat in the day and takes a while to cool down unless it's really cold out. I'll bump it back up to 4/4 on the stoker and see if it makes a difference. Maybe the fire will get to the top of the coals faster. I definitely plan to add the DHW coil, I sort of pulled the trigger on this last minute and didn't get the coil with it. I'm glad I did though, my house hasn't been 70 in 8 or 9 years! I got the stoker from Dave up this way. Brought it home, ripped it all apart, sandblasted and painted good old Ford blue.
Still working on the outer jackets now that it's warm out and also building a steel hopper with a tapered bottom that I can eventually have a tube going outside to pour the bags in from. I'll post some pictures up when it's done.