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3.2.4 Accelerated Combustion
The maximum heat output for the
BIS ULTRA™ fireplace is achieved by
burning with the combustion air damper
opened. By this method, the BIS
ULTRA fireplace can produce up to
60,000 BTU of heat per hour.
However, it will be necessary to reload with wood every one or two hours. This is the
least efficient method of burning the BIS ULTRA fireplace.
Use caution when firing with the combustion air control wide open. Only burn cordwood
in this manner. Small dry pieces of softwood and construction scraps will burn very
intensely using this method and may damage the firebox.
3.2.5 Medium Combustion
This is the recommended mode of
operating the BIS ULTRA fireplace and
should be the one normally used since it
will deposit the least amount of
creosote on the glass and in the
chimney. The combustion air damper
must be ¾ closed.
The precise setting will depend on many factors, including chimney length and the
moisture content of the wood. For instance, a long chimney will necessitate closing the
damper more. To obtain the proper combustion, close the damper completely, and then
open it about ½" to ¾". Three medium size pieces of wood should be burning on a bed of
hot coals. The heat output will be approximately 30,000 BTU per hour and the loading
time will be about every 3-4 hours. Softwoods may be burned using this method but the
time will be substantially reduced.
3.2.6 Slow Combustion
When the air combustion damper is
closed, the fireplace is in a slow
combustion phase. Slow combustion
will not stop the fire, but there will be a
noticeable change in the flame pattern.
The flames will be slow and may appear
dirty if the wood is too wet (moisture
content of 20% and more).
Always set the damper so that flames are visible, that way you maintain a good clean
combustion process. This method of burning should be used only after operating the BIS
ULTRA fireplace with the air control opened to produce a hot fire for about an hour.
Slow combustion can be used at night in order to reduce the heat output and prolong the
burn. The loading time will be between 6-10 hours.
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