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TW2000 WOOD-FIRED BOILER – INSTRUCTION MANUAL
TW2000 10/6/05
4
IN CASE A SERIOUS CREOSOTE FIRE BEGINS:
a) Close the damper door by disconnecting chain
b) Close all draft regulators
c) Throw ½ lb, of coarse or table salt on the fire and reclose door immediately.
d) Call the FIRE DEPARTMENT at once!
Have a firmly established Emergency Procedure in place for the handling of a flue
fire.
CREOSOTE
Wood combustion is never 100% complete. Wood smoke always contains some
unburned gases and a mixture of unburned tar-like liquids. A percentage of
these materials will condense out on any cool surface, leaving a dark brown or
black substance with an unpleasant acrid odour. This substance is commonly
called creosote.
If these wood gases condense out on cool surfaces such as a cold chimney or a
long smoke pipe they retain large amounts of water and will be very fluid. At
higher temperatures the condensed creosote will resemble tar (thick and tacky).
Creosote generation is highest during low heat outputs common with long
smoldering burns. Creosote generation is lowest during high heat outputs
common with intense fires. It is recommended that a small intense fire be used
for best results against creosote build up even though the Wood-Fired Boiler will
require refueling more often.
Creosote generation is also higher when burning green wood. The moisture in
the green wood absorbs the heat from the fire, cooling the fire below the point at
which the creosote can be consumed. The low temperature smoke is then
further cooled in the upper boiler chamber; smoke pipe and chimney allowing
large amounts of creosote to form.
To reduce creosote build-up during periods of low heat requirements (i.e Spring
and Fall) it is recommended to fuel the Wood-Fired Boiler with smaller quantities
of smaller diameter logs. Matching fuel loads and heat requirements will result in
cleaner combustion and higher efficiency.
1.3 Storage of Wood
Once cut, green wood dries (or seasons), quickly at first and then at a slower
rate. When the wood has been cut to the proper length and split, it should be
piled outside during the summer months. Place two poles on the ground to serve
as rails to keep the firewood off the moist ground. Stack the wood so that both
ends of the logs are exposed to the air if space is available, since more drying
occurs through the cut ends than through the sides. This is true even with wood
that has been split. The woodpile should be under cover so that it will not absorb
moisture from the rain and snow before it is used, but still open on the sides and
ends to the drying effect of the wind and sun. Store wood in neat, well-supported
piles.