Stoker Operating Instructions
The stoker operating instructions found in the paragraphs that fol- low should be regarded as generalized suggestions or recommendations rather than specific instructions. They may prove useful in those situations in which no operating manual from the manufacturer can be found. When possible, always consult the manufacturer’s operating manual.
Coal Selection
A bituminous coal, low in ash (6 percent or less), with an ash fusion temperature of 2200F° to 2600F°and 1 1⁄4-inch to 3⁄8-inch maximum is ideal for stoker operation. Oil treatment of the coal is rec- ommended in order to eliminate dust and add lifetime to the stoker. Generally speaking, in most sections of the country, a high-quality coal is generally most satisfactory and most economical. The annual coal tonnage for domestic stokers is usually low. Convenience and satisfaction are usually the primary factors considered when mak- ing the decision to install a stoker; therefore, good coal is recom- mended. Consult your local coal dealer or the stoker manufacturer for recommendations.
Starting the Fire
Generally, the procedure involved in starting a fire in a stoker- equipped heating installation includes the following steps:
1. Set the room thermostat above the room temperature.
2. Set the coal feed and air setting to the proper rate.
3. Throw the line switch to the on position so that the stoker starts.
4. Open the hopper lid, and watch the feed screw to make cer- tain that it is turning. Sometimes in shipping or installing the stoker, the feed screw may slip off the shaft on the gear case. Be certain that the feed screw is engaged before putting any coal in the hopper.
5. Fill the hopper with coal.
6. Set the overfire air door on the furnace 1⁄4 to 1⁄2 open, and lock in this position.
7. Let the stoker run until the retort (inside the furnace or boiler) is filled with coal.
8. Place a quantity of paper, kindling wood, and a small amount of coal on top of the retort and ignite it.