ARITERM SWEDEN AB
•
ARITERM OY
• Asennus ja käyttöohje • Installation och driftanvisning • Installation and operating instruction • UK 25.05.2012 •
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ARITERM-VTT-S-07229-11.1
Wood pellets are renewable bioenergy and provide fuel in a compact and uniform form, which
is easy to handle. The moisture content is less than 10%, which means that the pellets do not
freeze or become mouldy. No chemical substances are used in the manufacturing process. In-
stead, the binding agent is the tree’s own lignin.
The pellet diameter is 6 to 12 mm and the length is 10 to 30 mm. Due to their small size, the
pellets move freely in the feeding augers.
NOTE!
The Ariterm Bi series boilers are suitable for burning pellets of diameters ranging from
6mm through to 12mm. The burner is factory set for 8mm wood pellet having a mean density of
650kg/m3. Minor readjustment of the burner setting is required when utilizing alternative sizes/
densities of pellet.
Most of the disturbances that occur as a result of bad fuel quality are caused by incorrect han-
dling and intermediate storage before the product is delivered to the customer. Large contents
of fine materials may be due to insufficient sifting. Ash sintering is often caused by silicate
impurities (sand). These materials cannot be detected before burning. NOTE! If the ash is sin-
tered, all sintered material must be continuously removed from the burner head.
Fuel storage
Thanks to the feeding system, it is possible to build the pellet store for so-called bulk deliveries.
The store can be placed either inside or in a separate building outside the house. The shorter
the transport distance from the store to the burner, the better the feeding system functions.
Fire regulations must be taken into consideration when designing the boiler room and the stor-
age area.
The entire store must be insulated with extreme caution in order to prevent dust from spread-
ing.
The pellet delivery methods must be taken into account when choosing the store size. In gen-
eral, the pellets can be obtained in small sacks (20 kg), large sacks (500 kg) or directly to the
store by means of a blower truck. One tonne of pellet fuel requires about 1.6 m3 of storage
space. The smallest delivery batch for loose pellets is three tonnes. A store of 8 to 10 cubic me-
tres is a reasonable solution for many houses and involves lower delivery costs.
WOOD PELLETS AS FUEL
Fuel recommendation
Raw material
Chemically untreated, barkless wood
Diameter
8 mm
Length
15-32 mm
Volume weight
over 600 kg/m3
Moisture content
less than 10%
Ash content
less than 0.7 weight %
Fine material content
max 4 weight %
Ash melting temperature
> 1,100 °C
Energy content
>4.75 kWh/kg
