DAKA 521FB Manual page 27

OPERATING CONTROLS – continued
Automatic Damper Control (ADC)
The Automatic Damper Control (ADC) controls
 Fresh air to fire  Heat output  Burn time  Amount
of fuel burned  Efficiency  Stack temperature. By
understanding how simple adjustments to the ADC
will affect the output of the furnace you will be better
able to obtain the results you are looking for. There
are two things that you can control with any wood
burning appliance: 1) The amount of available fuel
and 2) the rate at which the furnace burns fuel. All
other things are bi-products of that combination.
You control the amount of fuel every time you refuel
the fire. The fuel burn rate is controlled by how
much air the fire is allowed to have. For example, a
full load of wood can be burned in as little as 4
hours, or can last up to 8 hours or more, by simple
limiting the amount of air to the fire. In cold weather,
your home will require more heat, which means you
will most likely burn more wood because you will
need to supply the fire with more air and more fuel.
More air is supplied by simply adjusting the ADC to a
higher setting and more fuel is supplied by refueling
the fire more frequently. The higher the heat output
the shorter the time between refueling. Maximum
heat output and maximum burn time cannot occur
simultaneously. Maximum heat output requires a
wide open air supply and maximum burn time
requires limiting the air supply. Somewhere
between the two extremes is the result you are
looking for.
The ADC below the fire door consists of a bimetal
coil spring and draft door assembly. As the heat
from the firebox reaches the spring, it automatically
expands and lowers the draft door. This reduces the
combustion air and the fire dies down. As the coil
spring cools down, it automatically lifts the draft door
open. This adds more combustion air and refreshes
the fire.
To start the fire, we recommend the knob control be
set on "HIGH." A setting between "OFF" and "HIGH"
will have to be found through experimentation for
your particular installation. Opening the ash door
slightly to aid in starting a fire is permissible, but
never for more than a few minutes.
DAKA 521FB Manual
XI. OPERATING INSTRUCTIONS
Page 27 of 32
FIRE CHAMBER AND ASH PAN
Check ash pan every few days and safely
dispose of ashes. Keep ashes from building up
on grate and interfering with combustion airflow
from below.
At end of heating season, clean out all residual
ashes & soot from furnace. The moisture they
contain could rust your furnace over the
summer months & shorten the life of the unit.
EMERGENCY OPERATION
Operation During Power Failure
Remove furnace filter(s) to prevent fire
hazard. Set automatic draft control to no higher
than "EPF"(Electrical Power Failure").
Continue firing the fire with smaller loads, more
frequently. NOTE: Use extreme care and
vigilance during power failure to keep furnace
from overheating. This could cause severe
warpage or breakage. For prolonged power
failure, removing the top and side air jackets
may help provide extra heat and help cool the
unit.
CAUTION:
DO NOT expect the DAKA furnace to keep the
house as warm during power failure as when
power is on. Do not attempt to increase heat
output by opening ash door or fire door.
IN CASE OF A CHIMNEY FIRE
Call the fire department immediately!
Turn Automatic Damper Control Knob to "OFF"
position to cut off oxygen to the chimney. Use
chimney fire extinguishing flares if you have them
(available at fireplace and woodstove shops).
After chimney fire, do not attempt to use
chimney again until a professional inspection is
made to determine safety.
BURNING COAL
If you are burning coal, you must have a coal
burning grate (DAKA Part #238) and a fire door with
a spinner knob (DAKA Part # 34200). Both are
available at your local dealer or through the DAKA
factory at www.dakacorp.com.
January 2009
Rev. 2, June 2012