24
CLEANFIRE OUTDOOR FURNACE • OWNER'S MANUAL
5. The combustion air inlets must be kept open and clear of ash and coals
to allow the furnace to operate properly. If needed, remove enough ash
to keep the combustion air inlets free of obstruction.
NOTE: It is important to understand that when the water temperature setpoint (185°F)
is reached, the combustion air is shut off until the water temperature drops to the
setpoint minus the differential setting. During this cycle-off time there will be no
active fire in the firebox. If the firebox door is opened, the wood might begin to
burn again but will be shut down when the door is closed if the water temperature is
above the setpoint. If the door is opened and closed when the water temperature is
below the setpoint the fan will cycle on again to achieve the setpoint even though the
differential point has not been reached. If the combustion cycle is activated with the
water temperature at least to the differential below setpoint and the fire is not actively
burning when the door is closed, first confirm that proper operating and maintenance
procedures are being performed before considering testing mechanical components.
6. When refilling the firebox, the new wood load will ignite quickly and
burn more efficiently if these instructions are followed. This will prevent
creosote buildup in the heat exchanger, air channels or primary elbow.
The operating procedures will maintain good air flow and very efficient
combustion.
DAILY
• Run the cleaning rod through the ash and coal bed and along both
sides of the air tube as shown on previous page to keep ash loose.
Use care near the refractory. This will allow excess ash to flow down
into the Reaction Chamber. If the coal bed/remaining wood is more
than 4 inches deep, it may be necessary to use the cleaning rod to
open a passage through the coals on each side of the air tube. Air
flow down past the air tube is essential for a good combustion rate
to be maintained. To confirm adequate air flow, cautiously open the
Reaction Chamber door to visually identify the combustion air flow
while the furnace is in a burn cycle with the fan on and the bypass
closed.
• To ensure the fire will maintain good combustion, it is important to
refill the firebox when an adequate amount of the previous wood load
is remaining (enough to provide enough heat and fire to dry and ignite
the new wood load). If the coals burn out from under the new wood
load and are unable to keep the fire going, there are not enough coals
and wood left from the previous load. Enabling the Easy Refire mode
will help keep part of the wood load for a quicker, more efficient fire
up after reloading. Easy Refire is enabled as default setting on version
6.72 and later.
• Be sure to fill the firebox with enough wood so there is adequate wood
left the next time you load to dry and ignite the new wood.
• Keep in mind that burning dry, well-seasoned wood requires less coals
to ignite the new wood load.
