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Exception TL200 Wood Stove
6
The Combustion Process
Combustion in your Harman Exception is controlled
very precisely. During a wood fire, primary combustion air
enters the bottom of the stove, is directed up to the top of
the load door and then down past the glass, finally enter-
ing the combustion chamber. Secondary combustion air
enters the bottom of the stove and is delivered directly to
the afterburner behind the firebox, where it provides the
additional oxygen required for clean burning
During combustion, burning proceeds through
several stages - an initial evaporation stage, where mois-
ture is released from the wood; a stage where volatile gases
containing much of the wood’s heating capacity are re-
leased and burned; and a charcoal stage, where the re-
maining charcoal burns to release the additional heat avail-
able. What is left after this final stage is ash. Within the
firebox, two or more of these stages are generally occur-
ring at once.
Operation
Controls
Two important controls - the top loading door handle
and the air control lever regulate the operation and output
of the stove.
Top loading door handle/damper interlock. The
top loading door handle is linked to the bypass damper
and serves two purposes. Move the handle forward one
position (approximately 3") and the handle automatically
opens the bypass damper. In this mode of operation the
combustion gases go directly from the main combustion
chamber to the flue collar and exit into the chimney.
Continue moving and lifting the handle and it opens
the top loading door.
NOTE: The bypass damper must be open for
smokeless loading. This is particularly important to re-
member when loading wood through the front door since the
front door and the bypass damper are not interlocked in the
same way that the top loading door is interlocked with the
bypass damper. Open the bypass damper by moving the
top door handle forward one position before opening the loading
door.
Top Load Door Open and Locked
Damper Closed
Damper Open