MCZ Omega '05 - Manual (Page 10)

PELLET STOVES Chapter 2
INSTALLATION AND USE MANUAL page
9
Theoretical notes for installation Technical service – Rights reserved MCZ S.p.A. – Reproduction prohibited
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2. THEORETICAL NOTIONS ON INSTALLATION
2.1. PELLETS
Wood pellets are manufactured by hot-extruding compressed sawdust
which is produced during the working of natural dried unpainted 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 goes
from 6 mm to 8 mm and the standard length is between 5 mm and 30
mm. A good quality pellet has a density between 550 kg/m 3 and 700
kg/m 3 with a water content that is between 5% and 8% by weight.
In order to guarantee the stated hourly consumption rates and
to optimise combustion, for pellet stoves MCZ has prepared a
patented method which makes it possible to identify and
classify any kind of pellet with a diameter of 6 mm and 8 mm
based on its specific weight and piece size.
By using the special PelletBox® and following the procedure set out in
the paragraph on lighting the stove, the user can determine the correct
settings for configuring the stove.
Along with being an ecological fuel which makes the best use of wood
residues thus producing cleaner combustion than that produced with
fossil fuels, pellets also have technical advantages. Whereas good wood
has a calorific power of 4.4 Kw/kg (with 15% humidity, so after about
18 months of seasoning), that of pellets is 5.3 Kw/kg.
To guarantee good combustion, the pellets must be stored in a clean,
dry place. The pellets are usually supplied in 15 kg. sacks, therefore
storage is very handy.
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 will intervention be necessary for cleaning
the internal parts, such as the grate and the
combustion chamber.
The pellets must be produced from pure wood which has not been
treated chemically.
The standards DIN 51731 and ONORM M 7135 certify a high-quality
pellet with the following characteristics:
Calorific power: 5.3 kW/kg
Density: 700 kg/m 3
Moisture content: 8% max by weight
Ash percentage: 1% max by weight
Diameter: 6-6.5mm
Length: 30 mm max
Pellet fuel
PelletBox®
15 Kg fuel sack