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September 7, 2007
433-1390D
Page 49
7100FP EPA Woodburning Fireplace
R
J. Burning Process
Fire requires 3 things to burn: fuel, air and heat. If heat
is robbed from the fi replace during the drying stage, the
new load of wood has reduced the chances for a good
clean burn. For this reason, it is always best to burn dry,
seasoned fi rewood. We do not advise burning unsea-
soned wood, however if it happens, you must open the
Slide Air Control and burn the fi replace at a high burn
setting for a longer time to start it burning.
Kindling or 1st stage:
It helps to know a little about the actual process of burning
in order to understand what goes on inside a fi replace.
The fi rst stage of burning is called the kindling stage.
In this stage, the wood is heated to a temperature high
enough to evaporate the moisture which is present in
all wood. The wood will reach the boiling point of water
(212°F) and will not get any hotter until the water is
evaporated. This process takes heat from the coals and
tends to cool the fi replace.
2nd stage:
The next stage of burning, the secondary stage, is the
period when the wood gives off fl ammable gases which
burn above the fuel with bright fl ames. During this stage
of burning it is very important that the fl ames be main-
tained and not allowed to go out. This will ensure the
cleanest possible fi re. If you are adjusting your fi replace
for a low burn rate, you should close down the air to the
point where you can still maintain some fl ame. If the
fl ames tend to go out, the fi replace is set too low for your
burning conditions.
Final stage:
The fi nal stage of burning is the charcoal stage. This
occurs when the fl ammable gases have been mostly
burned and only charcoal remains. This is a naturally
clean portion of the burn. The coals burn with hot blue
fl ames.
It is very important to reload your fi replace while enough
lively hot coals remain in order to provide the amount of
heat needed to dry and rekindle the next load of wood.
It is best to open the air control for a short while before
reloading. This livens up the coalbed. Open door slowly
so that ash or smoke does not exit fi replace through
opening. You should also break up any large chunks and
distribute the coals so that the new wood is laid evenly
on hot coals.
Fireplace operation does require air. Do not take air from
other fuel burning appliances which can result in improper
venting (smoking) or air dilution. Always provide adequate
makeup air.
CAUTION
K. Automatic Combustion Control (ACC)
Typically, when you build a fi re, you need to open the
controls to give the fi re more air so the wood will start
burning. You would then have to physically watch the
fi re and shut down the air controls so the fi replace does
not overfi re and burn up your wood too quickly. With the
Automatic Combustion Control (ACC) system, you do not
have to physically watch the fi re. Once you set the ACC
system it will monitor the fi re for you.
Set the ACC slide control to HIGH by moving it all the
way to the right. As you move the control rod to the right,
about 3/4 of the way you will feel some resistance. You
must move past that resistance approximately 3/4 in.
(19 mm) to reach the HIGH setting. Start your fi re and
then
move the slide control to the left to the desired burn
rate. (See page 50 for the position of the slide control for
the different burn rates.) The fi replace will automatically go
to that level after the fi re is fully established. This allows
for less manual monitoring of the fi re and more effi cient
use of fuel while maintaining the desired heat output.
NOTE: Close controls when not burning.
Low
Setting
Meet
Resistance
Move past
3/4" to High
High
Setting
Left - Close
Right - Open
THE DECORATIVE FASCIA MUST BE REMOVABLE
ON YOUR FIREPLACE IN ORDER TO SERVICE THE
AUTOMATIC COMBUSTION CONTROL SYSTEM.
Figure 49.1 Operating the ACC Controls
*Slide Air Control
Slide LEFT to Stop
Stop to 1/8 in. -1/2 in. open
Stop to 1/2 in. - 1-1/2 in. open
All the way to RIGHT