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CARE AND OPERATION
Page 21
FUEL REQUIREMENTS
Using the UltraGrate burn system, this appliance has
been designed to burn wood residue pellets with up to
3% ash content. Agricultural pellets (i.e…corn, alfalfa
etc.) are not permitted to be burned in the stove. Dirty
fuel will adversely affect the performance of the stove.
Caution: The use of unapproved, dirty, wet and / or high
salt content fuel will void the warranty!
Wood pellets manufactured to the Pellet Fuels Institute
(P.F.I.) certification standard are available in two grades,
standard and premium. The primary difference between
the two is the ash content of the pellets.
The P.F.I., specification for standard grade & premium
grade residential pellet fuel is as follows:
• CHLORIDES (Salt): Less than 300 p.p.m..
• BULK DENSITY: 40 lb. / cu. ft. minimum
• MOISTURE CONTENT: 8% maximum
• ASH CONTENT: < 3% maximum (standard
grade) < 1% maximum (premium grade)
• FINES: 0.5% maximum through a 1/8” screen
Pellet Feed / Pellet Size:
The pellet feed system is designed to handle a wide
range of pellet sizes up to a maximum of 5/16" diameter.
Different pellets may feed at considerably different rates.
You may notice a difference in the burn if you change
pellet fuel sizes. The longer the pellet, the slower it will
feed and vice versa. If the stove will not stay burning at
the minimum fuel feed setting, those particular pellets
may not be feeding fast enough. If this happens, reduce
the amount of combustion air by adjusting the damper.
See page 8 before adjusting the damper.
Long Burn Time:
When operated correctly, this appliance cannot be over-
fired. Continuous operation at a maximum burn can,
however, shorten the life of the electrical components
(blowers, motors, and electronic controls), and is not rec-
ommended. Typical approved operation would include
running at the low to mid range setting with occasional
running on the maximum setting during the coldest peri-
ods of the winter. The blower speed control should be
turned to high when operating the stove on the high heat
setting. A lower heat setting is recommended for over-
night operation or when the room is vacated for long pe-
riods of time.
Note: See Fuel Delivery Rate on page 18 for burn times.
CLINKERING
Silica (or sand) in the fuel, along with other impurities,
can cause clinkering. A clinker is a hard mass of silica
formed in the burning process. Clinkering is a function of
the fuel, (not the stove), but adversely affects the per-
formance of the stove by blocking off the air passages in
the grate. Even P.F.I. approved pellet fuel may tend to
clinker. A clinker can be removed from the UltraGrate
and placed in the ash pan with the use of the grate
scraper / ash pan tool furnished with your stove. See
Routine Maintenance, pages 22-25 for more information
on cleaning.
ASH
The frequency of removal of the ash and maintenance
performed on the stove is directly proportional to the ash
content of the fuel and the operation duration of your pel-
let stove. Low ash fuel may allow longer intervals be-
tween cleaning, however, a stove burning high ash fuel
may need to be cleaned as often as everyday.
PLEASE NOTE: Lennox Hearth Products has no control
over the manufacturing of pellet fuel and will not be held
responsible for poor stove performance or any damage
caused by inferior pellet fuels.
FUEL FEED RATES
Different brands of pellets will feed at varying rates due
to their size and density (length and diameter). This may
require a slight adjustment in the damper control (see
page 8) or the fuel feed trim to compensate (see Note on
page 16).
UltraGrate