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6. Ideally the large kindling should be burned until a thick bed of red embers is obtained. At
that point, add cordwood fuel and continue to operate the draft control wide open until the
fire is well established. Once the firebox is hot, the draft control can be partially closed by
moving the knob to the left to adjust the intensity of the fire.
Use table below to adjust the draft control to the desired burn rate:
Draft Settings
BURN RATE
DRAFT SETTINGS
Low & Medium Low
Gently push the draft control rod all the way in
Medium
Gently pull the draft control rod out to approx. 1/8"
Medium High
Gently pull the draft control rod out to approx. 1/2"
High
Gently pull the draft control rod all the way out
Closing the draft control down too soon will lower combustion efficiency, and may result in
creosote build-up in the chimney (which could lead to a future chimney fire).
Caution:
The Adjustment Range Should Not Be Altered For Increased Firing For Any Reason.
3.5 Maintaining the fire
Your Osburn insert will work best if a thick bed of hot embers is maintained in the bottom of the
firebox, and a minimum of two large pieces of seasoned fuel are added. Combustion efficiency
is largely related to establishing a hot ember bed, and hot firebox temperatures. The quicker the
insert and fuel get up to operating temperature, the better. A small intense fire is preferred to a
large smouldering fire, both to improve combustion efficiency and to reduce the amount of
creosote emitted. The best performance will be achieved by adding relatively small amounts of
fuel to a well established ember bed, and then operating with the air inlet control open long
enough to achieve a hot fire. Cordwood should be placed with air in between individual pieces.
Use a poker to make an air channel in the embers below the wood, this will allow air to flow
under the wood for a more efficient burn.
Extended burn times can be accomplished by first operating the insert on a full load with the air
inlet controls wide open. Once the fire is well established, and the moisture has been driven out
of the wood, reduce the air control to a lower setting. The unit should then burn cleanly without
smoldering. If the fire smolders without flame, re-establish a hotter fire before moving the air
control to the lower setting. A yellow flame burning in the top of the firebox is a good indication of
a clean efficiently burning fire.
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