johnstar, First off, make sure you had installed a barometric draft regulator in the stove pipe. If you don't have a draft gauge to measure the setting for the correct water colum, or got the chimney guy to do it. Build a wood fire get it hot and adjust the weight on the barometric draft regulator so it does not over fire. After that is set, now you can build your coal fire slowly over the wood charcoal. Adding a little more anthracite at at time, always leaving some red coals showing each time, until the coal is up to the top of the bricks. But, not over the bricks. This whole time you are building the coal fire, you don't use the draft combustion kit hooked up to the thermostat and make sure the draft fan slide is closed. When burning anthacite in the clayton the ash door spinner is all you have to control the heat to your house. The draft kit is only for a wood fire. This was disappointing because I thought there wouldn't be any control of the fire. But no. All you have to do is count the number of spins out from closed on the ash door to match the heat you need for the tempature outside. Finding that out may take some time, a few days, weeks, months, depending on the outside tempature. But once you know that, it doesn't change. You just have to be patient and spin out slow. Remember, you're burning coal not wood. During all that playtime, you may try different settings on the fan limit for the circulation cold air blower to the house, in combination with the three speed blower switch. Patience and short choppy shakes twice a day only until you see the red coal in the ash. That is the key to your CLAYTON.
I hope this helps you.