too much unburnt coal

new to my koker...almost been one full week. Husband's noticing a lot of unburned coal in the ashbin. is this because of the feed rate? if so, how much do we back it off? and is that because it's 25* warmer this week than last? Hubby says we're going through 3/4 of the 240 lbs. hopper a day...that seems high to me.. is it?

It could be your feed adjustment, and or too many pins in you timer running the feed too long. I have 3 or 4 pins in my timer at three different positions. Play with the feed stroke and see what happens in a day or so.
Gary

I'm down to three sets of four clips on my timer. I have minimal hot coal during extended idle.
My stoker screw is out about 7 or eight turns.

I've been burning 80#/day during January and had a couple days of 120# when the temps were very low.
My ash is pretty much the "granola" texture with very few pieces of unburned coal.

Keep in mind the clips and timer only make a difference when the stove is idling. When it's cold out and the thermostat is calling for heat, the timer, although still running, has no effect on the stoker time.

-Len

coal len- sorry for my ignorance, the manual is a bit lacking. the adjustment nut...which part are you supposed to turn? the end, middle, the whole screw? seems really tight to turn....

There's a gray rectangular tab under the nut on the end of the adjusting rod. Just turn the rod by holding the tab in your fingers. I have mine turned out 7 or 8 full rotations. I believe it comes set at four turns out. Just turn this with your fingers. Don't put any tools on it.
I'm attaching a photo of the adjusting rod. It's located under the hopper and above the expanded metal cage on the back of the furnace.
I hope this helps...
-Len

Sounds like you bought more rock than coal. Slate is black too. Don't know where you live but if you are near Mt. Carmel Harmony Coal mines has a great product. People call what you are burning "boney coal".

Peasefamily wrote:new to my koker...almost been one full week. Husband's noticing a lot of unburned coal in the ashbin. is this because of the feed rate? if so, how much do we back it off? and is that because it's 25* warmer this week than last? Hubby says we're going through 3/4 of the 240 lbs. hopper a day...that seems high to me.. is it?

When I had this problem with my KA-6 it was because of lack of air. I increased the air and it helped.
Jon