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Most of those fire boxes aren't lined, but they are extremely durable. Now before I go any further, you need to go buy a carbon monoxide detector. Nighthawk is the brand to buy. This furnace is extremely simple and you are probably just as qualified to work on it as anyone else. The lever on the side of the carb is a shut off, like you thought. The low med & high is just that, how high the flame is and thus how hot it gets. The fan may or may not be thermostatically controlled, but that isn't a big deal. Even a house fan will get the heat away. Many of these stoves never even had a fan, they heated by radiating the heat. The carb is pretty simple, but I wouldn't recommend monkeying with it unless you have to. There is a float inside that keeps the fuel at such and such level. Don't screw with anything in there unless you have to - parts are just about extinct for these. To light it, you turn on the carb to low med or high. You open the door to the fire pot. You wait until you can see a LITTLE wetness, light a small wad of toilet paper or something and put it in there on the wetness. Don't worry, it's diesel, it won't explode.
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