Damper Adjustment - Lennox Cascade Installation And Operation Manual

Installation Check List
It is strongly recommended that you have an authorized Lennox Hearth
Products dealer install your stove. If you install your stove yourself, you
should review your installation plan with an authorized Lennox Hearth
Products dealer.
Check list:
Check off each item as you proceed with the installation process.
q Read the ENTIRE stove installation section first.
q Determine the appropriate measurements and locations for your
installation.
q Follow the general installation directions under Installation.
q Be sure to pre-fit all items before you install, fasten, or set up the
stove permanently.
q Measure for exhaust (also outside air tube when applicable) and mark
the location. Place the unit in place to make sure it's correct before
cutting holes in your wall.
Prior to lighting your appliance:
q Review the Important Warnings section (see Page 2).
q Review Fuel Specifications (see Page 19).
q Review and follow instructions in the Care and Operation Section (see
Pages 17 through 19).
q Plug power cord connector into corresponding connector on the back
of appliance.
After you have begun operation of your appliance:
q Review the routine cleaning / maintenance information.
q Enjoy the warmth from your new Lennox Hearth Products pellet appli-
ance!
Damper Location and Adjustment
The damper is a plate that helps control the amount of airflow supplied
for combustion. With the damper pulled out all the way, the airflow is
at its maximum. As the damper is pushed in, the amount of air that is
allowed to flow is reduced.
It is very important to preset your damper prior to burning your pellet
stove. The damper rod is located on the right side of the stove as shown in
Figure 7. The damper should be pulled all the way out to the full open
position during initial operation. It may need to be manually adjusted
inward depending on the type of pellet fuel being burned. Adjust in 1/4"
increments until optimum combustion air flow is achieved. The damper
control adjusts the amount of combustion air to the UltraGrate™. When
the damper has been correctly adjusted, you will observe a brisk, yellow-
to-whitish flame. Fuel should not "pile-up" in the grate. The proper air
settings will vary from stove to stove due to installation, altitude, and
the fuel being burned.
Top View of Stove
Front
Figure 7 - Damper Control
8
Initial Setting - Pull damper
out to the full open position,
then adjust in 1/4" increments
until optimum combustion air
flow is achieved.
Damper Rod
Push in for less air
Pull out for more air
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 Figure 7). If the flame is "short" at the higher
burn rates and appears to burn the pellets out of the UltraGrate™ faster
than they can be resupplied, or there are significant variations of flame
height within a single burn setting, 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 a brighter
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 com-
bustion air delivery. Symptoms of insufficient combustion air include;
unburned fuel, lazy smoky or red / orange flame, excessive ash or soot,
excessive buildup on glass, fuel may "pile-up."
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 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, on Pages 20 through 24 for
information on cleaning requirements.
Excessive Combustion Air: Adjusting the damper to a more closed posi-
tion 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.
Another flame characteristic of a damper that is open too far is a flame
that has significant variation in height on any single burn setting.
Note: Excessive combustion air reduces efficiency.
Contributing factor:
•· Venting system providing excessive draft.
• Dry, hot burning fuel
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 and stay at relatively even height.
Outside Air Installations
Connecting the Cascade™ pellet stove to outside combustion air is
optional, except in manufactured (mobile) home installations and when
required by local building codes. The stove's air intake will accept 1-5/8"
ID pipe to accommodate outside air installations. The air intake on the
exterior of the home should always be located a minimum of 18" below
the flue termination and must remain free of obstruction. The inlet must
also have a screen with openings not larger than 1/4" to prevent rodents
from entering.