We have moved into an new home that has a hearthstone unit purchased and installed in the 1970s. The previous owner had kept and passed on a lot of information, but we are missing instructions on how to start and maintain a fire using the scissor based coal grate inside our unit. The company website no longer provides user guides for coal, only wood and pellets. Does anyone know if user manuals for previously made units from this company are avialable anywhere? Or have any advice to give us? I love the unit and we have recently had it reconnected to the flue. The flue has a little motorized fan, not sure what this is for? We have tried to ignite with some succes but the fires always die out quickly and we don't seem to be able to get the coal to get to the temperature to become self sustaining. I.e. Burning glowing red and ready to receive new coal on top.