NRPIM620-9-20131212 Rev 1
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CLINKER BUILDUP
The A-Maize-Ing Heat
®
furnace feeds biomass fuel into the bottom of the burner, therefore creating
the most efficient fuel consumption. The residual ash and clinkers are then spilled over the top of the
burner ring, falling into the ash pan below. This process essentially cleans the burner chamber.
CAUTION
If the furnace is installed in an unsuitable application, causing the furnace to run on high fire for
extended amounts of time, or if certain varieties of wood pellets are burned, clinkers can form
resulting in furnace inefficiency and possible fire outage.
The clinkers that stick to the side of the firepot must be loosened with a furnace poker (provided)
and removed manually with furnace tongs or the clinkers could render the furnace inoperative.
SUMMARY OF SETTINGS & OPERATION
HIGH FIRE
Adjustment of the opening on the combustion blower inlet controls fuel air mixture on high fire. This
opening should be adjusted during the high fire mode of operation to obtain an intense flame that
consumes the fuel at the same rate it is augered in.
The variable Btu timer relay controls the auger drive rate. It comes set from the factory at 15
seconds “ON” (red indicator) and 15 seconds “OFF” (green indicator). Allow the furnace to run for 4
hours, then evaluate if adjustment is necessary.
LOW FIRE
Adjustment of the chimney draft controls the rate of burn on the low fire mode of operation. Chimney
draft must remain below 0.04 inches water column and constant. The use of a second automatic
barometric damper may be necessary on some installations to insure the precise draft control. A
setting of 0.02 - 0.03 is ideal.
In most installations, the counter weight on the automatic barometric dampers should be set on the
minimum setting. Adjusting the on and off cycle time settings on the low fire timer controls the
amount of fuel fed to the firepot during the low fire mode of operation. The initial setting of this low
fire timer is 6 minutes “OFF” (green indicator) and 2 minutes “ON” (red indicator). After
approximately 24 hours of operation, a layer of ashes and clinkers form in the combustion area. After
this layer of ash and clinkers form, the “OFF” time can be increased to reduce the amount of fuel
consumed during this “low fire” mode of operation. Further adjustment can be made with user
experience.
Summary of Contents for NRP620-9
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