Lennox Hearth II-T C INS Damper Adjustment Guideline, AUTOMATIC SAFETY FEATURES Power Outage

CARE AND OPERATION

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Any adjustments for combustion air should be made at the damper by varying the spacing between the side of the stove and the inside of the damper set collar. The factory setting on the damper, as noted above, should correspond with the model you have.

If the fire goes out on the #1 setting, you will want to de- crease the combustion airflow. Loosen the set collar and push the damper in by 1/4” intervals. Tighten the collar at its new position (2 1/2” – 2 3/4”).

If the fuel is building up in the UltraGrateTM at the higher heat output settings, you will want to increase the amount of available combustion air. Loosen the set col- lar on the damper rod and pull the damper out. Do this 1/4” at a time. Tighten the collar at its new position (1 3/4” – 2”).

After making any adjustment to the damper set collar, pull the damper rod out fully and re-check the dimension between the stove side panel and the inside of the set collar.

NOTE: If the proper flame cannot be achieved with the damper control, adjustment of the trim controls may be necessary. See Control Board Operation on Page 21 for information.

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 Ultra- GrateTM, clinkers in the UltraGrateTM or leakage of air (if the UltraGrateTM is not properly seated) will starve the fire for air. See Routine Maintenance, on pages 26 through 30 for information on cleaning the stove.

Excessive Combustion Air: By closing the damper, this will reduce combustion air delivery. Symptoms of exces- sive 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 UltraGrateTM 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. It will not automatically restart when power is resumed un- less the exhaust temperature is still hot enough. A small amount of smoke may leak from the top of the window glass, the hopper and from the exhaust 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.

To re-light the stove, follow the normal procedure for starting your stove.

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 freestanding installation to induce a natural draft in the event of a power failure.

Overheating:

A high temperature switch will automatically shut down the stove if it overheats. The stove will need to be manu- ally re-lit. Allow up to 45 minutes cooling time before re- lighting. Keep enough convection air (room air blower) going through stove to keep it cooling properly, this will ensure long life of the stove. If the overheating continues, contact your authorized Lennox Hearth Products dealer for more information.

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