Lennox Bella Installation And Operation Manual page 11

Draft Adjuster Adjustment Guidelines
Lack of Combustion Air:
By opening the draft adjuster, this will increase combustion air delivery.
Symptoms 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 burn pot, clinkers in
the burn pot or leakage of air (if the burn pot is not properly seated) will
starve the fire for air. See Routine Maintenance, on Pages 25 through
30 for information on cleaning requirements.
Excessive Combustion Air:
Adjusting the draft adjuster 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 draft adjuster is open too far, the burning pellets will lift
off the bottom of the burn pot and fly up into the air much like popping
corn does. Another flame characteristic of a draft adjuster that is open
too far is a flame that has significant variation in height on any single
burn setting.
Contributing factor:
• Venting system providing excessive draft.
• Dry, hot burning fuel
Correct Combustion Air / Proper Burn Characteristics:
When the draft adjuster 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 Bella™ 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 3" ID pipe to
accommodate outside air installations. The air intake on the exterior of the
home should always be located substantially 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.
Thermostat installation
The Bella pellet stove can be operated manually or by thermostat. The
stove comes from the factory wired to operate manually - see control
board operation on Pages 19 through 21. A low voltage thermostat can
be installed on the stove. To install the thermostat:
1. Unplug the stove from the electrical outlet. Open the control board
access door. Locate the black wiring block at the top right on the back
side of the control board (see Figure 14). Loosen the two screws
B at the back of the block, and remove the U shaped jumper wire A
protruding from the block.
2. Insert a wire from the thermostat into one of the slots from which the
jumper wire was removed. Repeat this process for the other thermostat
wire.
Retain the jumper wire for future reinstallation. See Page 21 for ther-
mostat operation instructions.
IMPORTANT NOTE: Install the thermostat per the manufacturers instruc-
tions, provided with the thermostat. Failure to follow manufacturers
instructions could result in a malfunction. Pay special attention to the
thermostat location requirements. If the location requirements are not
adhered to the appliance, erratic operation or failure may occur.
Do not mount the thermostat where it may be affected by:
• Radiant heat from the stove, fireplaces, sun or other heat
sources.
• Drafts or dead spots behind doors or in corners.
• Hot or cold air from ducts.
Figure 14 - Back of Control Board
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE
B
A
Wiring Block
Remove jumper if
Thermostat IS to
be used
Leave jumper on, if
thermostat is NOT
used
A = Jumper Wire
B = Screws
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