successfully burning anthracite coal in a clayton furnace

Dear Coal Crazy, I have an ashley 1602R. I'm having ahard time with it. When I read the manual, it said nut, not stove. So I'm using nut. I'm also not sure how much to pile on at night. and i'm not getting nearly the amount of heat i get when I burn wood in it. What am i doing wrong ?

When you put coal in it don't be afraid to fill it up to the top of the fire bricks and yes I know that's a lot of coal but if you don't you won't get the heat your looking for. You will need to add the coal slowly. Put a layer in and let it catch before you add more.