Harman 300i Wood Insert
7
For Installation In Masonry Fireplace Only
Controls
Two important controls - the damper bypass handle and the
air control lever regulate the operation and output of the stove.
To open the front loading door, you must open the damper
bypass, or smoke will spill into the room. In this mode of
operation the combustion gases go directly from the main
combustion chamber to the flue collar and exit into the
chimney.
Lift upward on the damper handle to open the bypass
damper and push down to close it.
NOTE: The bypass damper must be open for
smokeless loading.
Damper Closed
Damper Open
The Combustion Process
Combustion in the Harman 300i is precisely controlled
and is best explained in two parts.
During a wood fire, combustion air enters at the bottom
front of the stove where it travels upward through channels
at either side of the front door. From the manifold located
above the front door, it is directed into the firebox as a sheet
of air flowing between the glass and the wood. This concept
helps to keep the glass clean, while providing the oxygen
needed to sustain burning. This is what is known as "Primary
Combustion".
Additional air enters at the bottom rear of the stove body.
Some of this air enters through holes in the rear bricks where
it invigorates the fire at the rear of the firebox. The remaining
air is delivered into the "Firedome" combustion package
where it combines with the heated exhaust gases. This re-
burning of the smoke is known as "Secondary Combustion".
During combustion, the burning of wood proceeds
through several stages. The initial or evaporation stage is
where the moisture in the wood is driven off in the form of
steam. A second stage is where the volatile gases contained
in the wood are released and burned. This represents most of
the wood's heating capacity. The final stage is the charcoal
stage where the charcoal burns the remaining heat content
in the wood fuel. Ash remains after the burning is complete.
Within the primary firebox, two or more of these stages of
combustion are occurring at once.
Never build a fire directly against the glass. Always
keep the fuel load behind the andirons.
Summary of Contents for 300i
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