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Ravelli AURORA Manual

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Pag.17
EN
The manufacturer declines all direct civil or criminal responsibility due to:
•
poor maintenance
•
failure to observe the instructions in the manual
•
use not compliant with the safety instructions
• installation that is not compliant with the regulations in force in the country.
•
installation by personnel who are not qualified or authorized
•
modifications and repairs that are not authorized by the manufacturer
•
use of spare parts that are not original
•
exceptional events
3.2 Spare parts
Use original spare parts only. Do not wait for the components to be worn
before replacing them. Replace a worn component before it is completely
broken to prevent any accidents caused by the sudden breakage of
components, perform the periodic maintenance checks as described in
the dedicated chapter.
3.3. Majolica finishes
The cast majolica stoves with a special hand finish may cause
surface imperfections such as shadowing and details that make every
majolica one of its kind. As it is a delicate material, please handle with
care whilst cleaning and avoid blows as sudden breakage may occur.
Please also take care when loading the hopper (Ed.’s note; tank containing
the pellets) with the sack of pellets: do not place it on the stove!
3.4. What are the wood pellets
The wood pellets are made from sawdust and wood shavings produced in
joiners’ shops. The material used cannot contain any foreign substance
such as glue, varnish or synthetic substances.
Subjecting it to high pressure, the wood is pressed through a plate with
holes and due to the high pressure the sawdust is heated activating the
natural binders of the wood. Thus, the pellets keep their shape even
without the addition of bonding substances. The density of the wood pellet
varies according to the type of wood and can be 1.5 – twice greater than
that of natural wood. The diameter of the cylindrical rods is 6-10 mm and
their length can vary between 10 and 50 mm.
Their weight is equal to about 650 kg/m. Due to the low content of water
(8-10%) they have a high energy content.
The standards DIN 51731 define the quality of the pellets:
Length:
10-30 mm approx.
Residual humidity: 6-12% approx.
Diameter:
6 – 10 mm approx.
Ashes: <1.5%
Real weight:
650 kg/m
3
approx.
Specific weight: >1.0 kg/d
m
3
Calorific power:
4.9 kWh/kg approx.
Do not put the bag of pellets on the ceramic
parts during the loading operations.
The pellets must be transported and stored in a dry place. They swell on
contact with damp, and cannot be used, They must always be protected
from the damp both during transport and in storage.
Ravelli recommends using a pellet with a diameter of 6 mm for the
stove. Otherwise it will be necessary to ask the assistance centre for
the appropriate regulations.
3.5. The components of the stove
This drawing shows the internal parts of a pellet stove.
By filling the tank (7), the pellets are loaded into the fire pot (3) through
the loading screw (1).
Ignition is by means of the resistance (2), which overheats the air from
the special entrance (5) which on contact with the pellets will allow the
development of the flame. At this point the exhaust smoke is deviated to-
wards the stainless steel exchanger (6) and through the smoke extraction
tube (4) it is released into the flue, through the connection with the smoke
exhaust pipe. (9).
3.6. The combustion
The combustion is simply a chemical reaction between combustible and
carburant. The result of this reaction is the heat.
The three elements that are required for the combustion are:
•
Combustible (pellet)
•
Carburant (oxygen available in the air)
•
Ignition (electrical resistance for ignition)
To get the combustion, the combustible and the carburant must be avail-
able in a correct proportion.
The reaction between combustible and carburant is made by an external
starter. The start can be made by the hot reaction or by a sparkle.
The combustion is NOT CORRECT, the flame is too tight with too much
incandescent pellet in the firepot. Adjust the Set pellet/air reducing the air
percentage (from 0 up to -5); in the vent this is not enough to get a proper
flame, increase the loading quantity of the pellet (from 0 up to +5) to reach
the flame condition shown in picture 3.
The combustion is NOT CORRECT, the flame is
weak and a lot of unburned pellet wood into the
firepot. Check first that the ash pan is properly
closed. Then adjust set pellet/air increasing the air
percentage (from 0 up to +5); in the event this is
not enough, increase the loading quantity of the
pellet (from 0 up to -5) to reach the flame condition
shown in picture 3. If with the adjustments done,
the flame is not reaching the condition shown in
picture 3, contact After Sales Service.
Fig. 1
The combustion is NOT CORRECT,
the flame
is weak and a lot of unburned pellet wood into the
firepot. Check first that the ash pan is properly
closed. Then adjust set pellet/air increasing the air
percentage (from 0 up to +5); in the event this is
not enough, increase the loading quantity of the
pellet (from 0 up to -5) to reach the flame condi-
tion shown in picture 3. If with the adjustments
done, the flame is not reaching the condition
shown in picture 3, contact After Sales Service.
Fig. 2
The combustion IS CORRECT,
full flame yel-
low/white and minimum quantity of pellet in the
firepot.
The combustion if fine and no ad.
The picture 3 show a flame done with a stove
working at power P5.
Fig. 3
4. SAFETY DEVICES
The oven is fitted with sophisticated safety systems so that, in the case of
breakage of one of the individual parts or defects in the flue, no damage
will be caused to the stove and the room in which it is installed. In any
case, when a problem arises, the pellets stop falling immediately and the
switch off phase is activated.
The corresponding alarm will be shown on the display. The details can be
seen in the chapter on the alarms.
5. TECHNICAL FEATURES
All Ravelli products are manufactured according to the following direc-
tives:
• 89/106 EEC
construction materials
• 73/23 EEC
electrical safety
• 2006/42/EEC
machines
• 2004/108 EEC
electromagnetic compatibility
And according to the following standards:
• EN 14785
• EN 60335-1 EN 50165
• EN 292 EN 294 EN 349
• EN 55014.1 EN 61000-3-2 EN 61000-3-3
• EN 55014.2
7
2
3
6
1
8
9
5
4
9
1. pellet loading screw
2. resistance unit for ignition
3. combustion fi re pot
4. tube for passage of smoke
5. air intake tube
6. stainless steel exchanger
7. pellet hopper
8. fl ame trap
9. smoke exhaust tube
… 17 …


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