PELLET STOVES
Chapter 2
USE AND MAINTENANCE MANUAL
page
10
Theoretical recommendations for installation
Technical dept. - All rights reserved by MCZ Group S.p.A. - Reproduction prohibited
2.
THEORETICAL RECOMMENDATIONS FOR INSTALLATION
2.1.
THE PELLET
Pellets are obtained from sawdust drawing produced when working
natural dried wood (unpainted). The compact nature of the material is
ensured by the lignin that is contained in the wood itself and allows
pellets to be produced without using glue or fixing materials.
There are various types of pellet on the market, with characteristics that
vary depending on the mix of wood used. The diameter of the pellets
varies between 6 and 8 mm and the standard length is between 5 and 30
mm. Good quality pellets have a density that varies between 600 and
over 750 kg/mc and a water content that is kept between 5% and 8% of
the pellet's weight.
As well as being an eco-friendly fuel that makes maximum use of wood
residues to obtain cleaner combustion than fossil fuels, pellets also offer
technical advantages. While a good wood has a calorific value of 4.4
kW/kg (15% humidity after approximately 18 months of ageing), pellets
have a calorific value of 4.9 kW/kg.
Pellets must be kept in a dry place protected from dirt to ensure good
combustion. Pellets are usually supplied in 15 kg bags to make storage
very practical.
A good quality pellet ensures good combustion and lowers harmful
emissions into the atmosphere.
The poorer the quality of fuel, the more often the
brazier and combustion chamber must be cleaned.
The main quality certifications for pellets on the European market are
DINplus
and
Ö-Norm M7135.
These certifications guarantee that the
following values are adhered to:
Calorific value:4.9 kWh/kg
Water content: max 10% of weight
Percentage ash: max 0.5% of weight
Diameter: 5 - 6 mm
Length: max 30 mm
Content: 100% untreated wood without any added fixing
substances (max. percentage bark 5%)
Packaging: in bags made from environmentally friendly or
biologically decomposable material
Pellet fuel
15 kg bag of fuel
