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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.