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2. Installation – understanding the basics
Pellets
2.1.
Wood pellets are manufactured by hot-extruding compressed sawdust which
is produced during the working of natural dried wood. The compactness of
the material comes from the lignin which is contained in the wood itself, and
allows the production of pellets without the use of glues or binders.
The market offers different types of pellet with characteristics which
vary depending on what mixture of woods is used. The diameter varies
between 6 mm and 8 mm, with a standard length in the range ¼" to 1
½". Good quality pellets have less than 0.5% ash with a moisture
content which varies from 5% to 8% by weight.
Besides being an ecological fuel (exploiting timber residues to the
maximum and achieving cleaner combustion than is possible with fossil
fuels), pellets also have technical advantages. While good-quality
timber has a calorific power of 4.4 kW/kg (with 15% moisture,
therefore after about 18 months' seasoning), the equivalent figure for
pellets is 5.3 kW/kg.
To ensure good combustion, the pellets must be stored in an area that
is free of humidity and protected from dirt. The pellets are usually
supplied in 40 lb. sacks, so storing them is very convenient.
Good quality pellets ensure good combustion, thus lowering the
emission of harmful agents into the atmosphere.
The poorer the quality of the fuel, the more
frequently cleaning will be necessary. Especially the
internal parts, such as the grate and the combustion
chamber.
The main certifications of quality for pellets in the European market are
DINplus and Ö-Norm M7135; these ensure respect of:
Calorific power: 4.9 kW/kg
Water content: max 10% of weight
Percentage of ashes: max 0,5% of weight
Diameter: 5 – 6mm
Length: max 30mm
Contents: 100% untreated wood, with no added bonding
substances (bark percentage 5% max)
Packaging: in sacks made from ecologically compatible or
biologically decomposing material
MCZ strongly recommends using certified premimun
quality pellet fuel in its stoves
The use of poor quality high ash fuel compromises
the running of your stove and could void the
warranty.
MCZ pellet stoves run exclusively on pellets with a
diameter of 6-8 mm with lengths from ¼" to 1 ½".
Theoretical notions for installation
PELLET STOVES
INSTALLATION AND USE MANUAL
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Chapter 2
Fuel pellets
9
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