I'm not sure if you have the 513 or the 715..... But I think it's the 715. I have the same stove. A couple of items for you:
The 715 has a SINGLE piece hopper. Many of the links to the blowup diagrams have a 2 piece.....that's for the 513.
On top of the hopper are two feed plates and just under the cover door and above the hopper is another cover plate with a reducer. The hopper needs to be removed when burning wood.
In short, you can't burn coal during the day, then wood at night. It's one or the other. The reason is because the hopper will trap smoke from the wood fire, and you will see it leaking out the top regardless of the gasketing. The steel plates work as baffling to push the smoke into the side outlets and out to the rear plenum and out the chimney. I use wood and charcoal only in the ash pans and in the basket in order to start the stove. Then I slowly add the coal through front door until it gets going......then I feed coal in rough the hopper. This stove holds 80 lbs at a time.
Fully open you are looking at 70k BTU. Run only Pea coal as nut is larger and the voids between the coal chunks will cause faster and hotter firing, thus making it more difficult to control, and constantly in need of riddling.
I run my stove at between 400-600 degrees on the door, and my stack temp just above the top of the stove is 200 degrees. I have mine in a basement surrounded by concrete. You have to be careful of over firing in a living room setting because flashover can occur above 700 degrees. Keep combustibles away.
Keep in mind too, that sustained temps above 600 degrees are probably too hot, but that cast iron, which these stoves are, is capable of withstanding 1800 degrees without issue. It's chosen because cast iron transmits heat the best of all available metals, and is durable.
Let me know if you have any other questions and post some pics, or email me directly at firstname.lastname@example.org
I heat a 2400 sft colonial with this stove and 3.6 Tons of coal per year. $1200 in coal versus $3000 in oil.