Harman Stove Company Super Magnum Coal Stoker Stove Feed Rate Adjustment, Mode Selection

Super-Magnum Coal Stoker Stove

a. Feed Rate Adjustment

The Circuit board runs on a one minute timer cycle. Each minute, the board is thinking ahead to what it needs to do for the next minute to maintain or achieve the demanded temperature. What you are setting on the feed adjuster dial is the maximum amount of feed time, per minute, that you'll allow. The circuit board will make its own determination of how long to run the feeder, UP TO the maximum as set on the dial. For instance, a number 4 setting on the feed adjuster will allow a maximum of 40 seconds per minute of feed. If the room temperature is satisfied, with only feeding 20 seconds, then that is all the circuit board will run the feeder. In most tested scenarios, the number 4 setting is adequate, however, fuel quality may dictate a higher or lower setting. If you see un-burned or burning coal being pushed off of the grate during a high demand period, the feed rate is set too high. Ideally, you'll want to see about an inch of ashes in front of the burning coal during a peak demand period. Setting the feed rate too low may not allow the demand temperature to be met. Keeping the setting at #4 or above will work with most batches of coal. Allow a minimum of one hour between adjustments.

Note: Since the circuit board is feeding as needed, only adjust the feed rate while maximum demand is occurring. (Stove Temp Mode, with a temp dial setting of #7 will create maximum demand.)

b. Mode Selection

Room-Temp mode is the ideal mode of operation if you wish to maintain a comfortable temperature in the room. As the outdoor temperature fluctuates, the Super Magnum will adjust the feed rate to maintain the desired temperature setting in the room. For best results, be sure the room sensor is located outside of any drafty areas and not positioned on the floor or near an exterior wall.

Stove-Temp mode is more of a manual method of operation. The stove will run at a constant heat output, regardless of outside air temperature. Note that on the coldest days, your indoor heated space will be cooler than on the warmer days. The only real benefit to this mode of operation is that you'll be able to know exactly how long a hopper full of coal will last, because the consumption is going to stay relatively the same.

c. Temperature Dial

The temperature dial is a dual purpose dial. In Room- Temp mode, you select the room temperature you want the stove to maintain at the room sensor probe. This is marked in fahrenheit scale from 50 to 90 degrees. In Stove-Temp mode, you select a temperature setting based on the #1 - 7 with 1 being a minimum burn and 7 being a maximum burn rate.

d. Blower Speed Adjustment

The mode selector is also marked with a L to H scale, in each mode. This is a variable speed control for the distribution blower. L is the low setting, and H is the high setting. It is important to note that the blower will not come on until the ESP reaches a high enough temperature to ensure that cold air is not being blown out into the room. Also, the speed of the blower, when set on lower speeds, will automatically increase as the temperature of the stove increases.

Keep Hopper Lid, Ash Pan, and Fire viewing doors closed while in operation. Maintain all door seals and gaskets in good condition. Replace gaskets when necessary using parts obtianed through your Harman dealer.

Burning with one or more of the unit doors open will lead to overfiring which could damage the appliance, chimney, or connector, or could cause a house fire.

3-90-02702R4_08/12 Do Not Burn Wet Coal! 21