Lennox Hearth 32FS Turning Off Your Stove, Damper Operation, Damper Adjustment Guideline

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Turning Off Your Stove

Press the "STOP" button to initiate the shut down cycle (auger LED will be red). The pellets will stop feeding and the blowers will continue to run on a timed cycle. The stove will shut down safely upon completion of the shut down cycle.

Shutdown Mode - When the thermostat opens (not calling for heat), or the auger "STOP" button is pressed (feeding LED will be off), power to auger motor will be discontinued. The blowers will continue at the control board setting until the low limit thermal switch cools enough (below 120° F) to open. For safety, the blowers will continue to run for approximately 10 minutes before the unit shuts down.

Damper Operation

The damper assembly controls the amount of combustion air that is delivered to the firebox. With the damper adjusted all the way in, the airflow will be at its minimum. As the damper is moved outward, more air is delivered (see Damper Location and Adjustment on Page 9).

It will be necessary to monitor the appearance of the flame during the first 4-8 bags of pellets. If the flame is smoky red or orange with evidence of soot at the top of the flame, the damper will need to be adjusted to deliver more combustion air (see Damper Location and Adjustment on Page 9). If the flame is “short” at the higher burn rates, or if the pellets are burning up in the UltraGrate™ before new pellets are fed into the fire, the damper may need to be adjusted to deliver less combustion air.

After the damper is adjusted, re-evaluate the appearance of the flame. It may be necessary to continue adjusting the damper in increments until proper combustion is achieved (the flame should become yellow and begin to “dance”).

Once the damper has been properly set (and if the routine maintenance is performed as needed), the damper should not require re-adjustment unless you are changing from a premium grade pellet to a standard or high ash pellet, in which case the damper may need to be moved outward to help prevent the accumulation of ash in the UltraGrate.

Damper Adjustment Guideline

Lack of Combustion Air:

By opening the damper, this will increase combustion air delivery. Symp- toms of insufficient combustion air include; unburned fuel, lazy smoky or red / orange flame, excessive ash or soot, excessive buildup on glass.

Contributing factors:

•High Altitude – Lack of oxygen

•Restrictive Venting (elbows, horizontal runs, cold external chimneys, etc.)

•Dirty / Poor Quality Fuel

•Lack of Maintenance

Note: Excessive amounts of fly-ash built-up in the UltraGrate™, clinkers in the UltraGrate or leakage of air (if the grate is not properly seated) will starve the fire for air. See Routine Maintenance, on Pages 21 through 24 for information on cleaning requirements.

Excessive Combustion Air:

Adjusting the damper to a more closed position will reduce the combustion air delivery. Symptoms of excessive air include; fuel burns too quickly (results in smoking or smoldering pellets), white to yellow flame, etc. If the damper is open too far, the burning pellets will lift off the grate and fly up into the air much like popping corn does.

Note: Excessive combustion air reduces efficiency.

Contributing factor:

• Venting system providing excessive draft.

Correct Combustion Air / Proper Burn Characteristics:

When the damper is correctly set, the burning pellets should move (wiggle) around slightly and the flame should be bright yellow.

Automatic Safety Features

Power Outage:

During a power outage, the stove will shut down safely. The stove will automatically restart when power is resumed. The solid state control board has an internal memory that will retain heat output and blower speed settings through voltage interruptions.

A small amount of smoke may leak from the top of the window glass, the hopper and from the combustion air intake, if the stove is vented horizontally with no vertical pipe. This will not persist for more than 3 to 5 minutes and will not be a safety hazard. It may set off your smoke alarm.

Note: If the area in which you live is prone to frequent power outages, it is recommended that a minimum of 8 feet (2-1/2 meters) of vertical vent pipe be included in a free-standing installation to induce a natural draft in the event of a power failure.

Overheating:

High temperature thermal switches will automatically shut down the stove if it overheats. Allow up to 45 minutes cooling time before re-lighting. Keep enough convection air going through stove to keep it cooling properly (adjust convection [room air] blower speed to a higher setting), this will ensure long life of the stove. If the overheating continues, contact your Lennox Hearth Products dealer for more information.