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Astra P-7 USER MANUAL
4. FUEL
The wood pellets are made from sawdust and wood shavings. The materials used for production of the wood pellets cannot contain
any unnatural components, for example, synthetic glue or paint. The density of the wood pellet varies according to the type of wood
and can be 1.5 – 2 times greater than that of conventional wood. The diameter of cylindrical rods is 6-10 mm and their length can vary
between 10 and 50 mm. Their weight is equal to about 650 kg/m3. Due to the low content of humidity (5-10%) wood pellets have
high energy content.
DIN 51731 standard defines the quality of wood pellets:
Length
10-50 mm
Diameter
6 - 10 mm
Weight
650 kg/m
3
Calorific value
4.9 kWh/kg
Residual humidity
6-12%
Ashes content
<1.5%
Specific weight
>1.0 kg/dm
3
Do not put a bag of pellets on the surface
of the stove during the loading operations!
The pellets must be transported and stored in a dry place. They
swell after contact with moisture and become unsuitable for
firing. The pellets must always be protected against humidity
both during transportation and storage.
Astra strongly advices using the 6 mm diameter
wood pellets for fuelling the Astra stove.
5. PLACEMENT, ASSEMBLY AND INSTALLATION
•CONSIDERATIONS FOR PLACEMENT OF THE STOVE
The residential space considered for the placement of the stove must meet the following technical requirements:
• Pipe connection to a chimney of 8 cm diameter must be installed;
• The supply of air for combustion must be assured either from other ventilated rooms through opening of at least 100 cm
2
, or directly
from outside through the 35 mm air intake pipe;
• The permanent humidity of air in the room must not exceed 80%;
• A connection of electrical supply of 230V, 50 Hz must be installed;
• CE compliant earthing system must be present.
The placement of the stove is important for the successful heating of the room. Please, take into account the next considerations
before deciding where to place the stove:
• If the supply air needed for combustion is to be taken from another room, that room must be ventilated or have air inflow from
outside. The stove can consume up to 40 m3 of air per hour at maximum, so the sufficient amount of it must be supplied either from
outside or from another inner space of a house;
• The stove cannot be placed in the bathroom, near a shower or bath, or in another space with high humidity level;
• If wooden flooring is present in the desired place of installation, first cover it with a protective fire-resistant plate made from steel,
glass or ceramic;
• The room in which the stove is to be placed must have at least 30 m3 of volume;
• It is recommended to place the stove in the largest room of a house or in a room which has good connectivity with other inner spaces
of a house, so that the maximum circulation of heat would be ensured;
• Connection to the electrical supply must be done through a grounded socket. If the cable of the stove is not long enough to reach the
nearest socket, use a grounded extension cable;
• If another heating installation (stove, fireplace) without autonomous air supply is present in the room of considered placement of the
Astra stove, evaluate, whether there would be a sufficient air supply for both appliances working simultaneously and if that kind of
double installation is allowed by local technical regulations;
The stove must be installed and assembled only by qualified personnel.
• The stove must be placed so that easy access to it and to a chimney is ensured.
• The joints of chimney pipes must have temperature resistant gaskets in order to ensure sufficient tightness of the connections;
• A separate chimney is mandatory for the Astra stove installation. It is not permitted to connect the stove to a shared flue;
• The connection of the air intake tube of the stove to an outside is not obligatory. If the air for combustion is taken from inner spaces
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