Lennox Hearth T300P Care And Operation, Damper Operation, Damper Adjustment Guideline

CARE AND OPERATION

DAMPER OPERATION

The damper is a plate that helps control the amount of airflow supplied for combustion. With the damper pushed in all the way, the airflow is at its minimum. As the damper is pulled out, more air is allowed to flow.

It will be necessary to monitor the appearance of the flame during the first 4-8 bags of pellets. If your flame is smoky red / orange with evidence of soot at the top of the flame, you need more combustion air; pull the damper out one notch and re-evaluate the appearance of the flame. It may be necessary to continue this process, moving the damper one notch at a time until proper com- bustion is attained (the flame should become yellow and begin to “dance”). If the flame is “short” at the higher burn rates, or if the pellets are burning up in the grate before new pellets are fed into the fire, push the damper in one notch and monitor the flame. Continue the proc- ess of moving the damper one notch at a time and evalu- ating the flame until proper flame appearance is achieved.

Once the damper has been properly set, it should not need adjusting unless you are changing the grade of pel- let fuel, in which case the damper may need to adjusted.

DAMPER ADJUSTMENT GUIDELINE

Lack of Combustion Air: By opening the damper, this will increase combustion air delivery. Symptoms of insuf- ficient 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.

Note: Excessive amounts of fly ash built-up in the grate, clinkers in the grate or leakage of air (if the grate is not properly seated) will starve the fire for air. See Routine Maintenance, pages 22-25 for information on cleaning the stove.

Excessive Combustion Air: By closing the damper, this will reduce 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 much, the burning pellets will lift off the grate and fly up into the air much like popping corn does.

Contributing factor:

•Venting system providing excessive draft.

Correct Combustion Air / Proper Burn Characteris- tics: When the damper is correctly set, the burning pel- lets 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 re- sumed. 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 combus- tion 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 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 ½ meters) of vertical vent pipe be included in a freestanding installation to induce a natural draft in the event of a power failure.

Overheating:

A high temperature disc (thermal switch) will automati- cally 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, this will ensure long life of the stove. If the over- heating continues, contact your authorized Lennox Hearth Products dealer for more information.

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