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    SLCamp's Avatar
    SLCamp Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 5, 2008, 06:05 PM
    Dealing with "Old Smokey" a coal furnace
    Does anyone out there know about coal furnaces? Sounds silly but you would not believe how hard it is to get help with one of these monsters. By working and taking the
    Thing apart several times my daughter finally was able to install a new gear box and motor but in the meantime the thermostat seems to have stopped working and the clock is only
    Running the stoker on hold fire. We put in a new mercury switch type and it is level so my
    Next guess is something else on the furnace.
    On the furnace bonnet there are 2 boxes, one is the limit control but I have no idea what the other one is except that the wire that comes out of it goes into the same place that
    The thermostat wires go, and on the front of this box is a little switch that say automatic or
    Manual. Does this have to do with the thermostat?
    Thanks for any help anyone can give.
    SLCamp
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 5, 2008, 06:18 PM
    One is a limit and the other is for the coal stoker. The thermostat passes through the switch and the switch tells the stoker to add coal. It also acts as a stop so too much coal is not added. It has been 30 years since I worked on one so I do not have much onfo to offer. I used to keep all the different stoker shear keys on the truck as a memento.
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