Ravelli BLOCK 7 STONE, Installation, Operation And Maintenance Manual

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5.4 CHARACTERISTICS OF THE FUEL
Wood pellet is a fuel made of pressed wood
sawdust, often recovered from processing scraps
of carpentries. The material used cannot contain
any extraneous substance such as, for example,
glue, lacquer or synthetic substances.
The sawdust, once it has been dried and cleaned
from impurities, is pressed using a die with holes:
as a result of high pressure, the sawdust heats
up by activating the natural wood binders; this
way the pellet maintains its shape even without
adding artificial substances.
Wood pellet density varies based on the type of
wood and can exceed that of natural wood by 1.5
- 2 times.
The cylinders have a diameter of 6 mm and a
variable length between 10 and 40 mm.
Their density is equal to approximately 650 kg/m
3
.
Due to their low water content (< 10%) they have a
high energy content.
The UNI EN ISO 17225-2:2014 standard (that
replaces the EN PLUS standard) defines pellet
quality by specifying three classes: A1,
A2 and B. Maintain fuels and other flammables at
a suitable distance.
Ravelli recommends using wood pellet classified
A1 and A2 according to the EN ISO 17225-2:2014
standard, or certified DIN PLUS (more restrictive
than the A1 class) or ONORM M 7135. Pellet may be
light or dark coloured, it is normally bagged into
bags that show the name of the producer, the
main characteristics and classification according
to standards.
Pellets must be transported and stored in a dry
area. Upon contact with humidity they swell and
become unusable.
Using fuel that is not compliant with the above
will void the warranty.
5.5 DESCRIPTION OF OPERATION
Ravelli Block pellet stoves are home heating
appliances powered by wood pellets with
automatic loading.
The heat generated by the combustion of the
pellets is diffused in the installation room thanks
to the ventilation system as well as by radiation.
It is possible to choose whether to activate the
front fan or keep the stove in operation by natural
convection.
The stove is controlled by an electronic control
unit that manages the start-up, operation and
shutdown phases and also includes many other
functions for control, programming and safety.
The user can choose the operating power from
5 levels, or set the temperature to be maintained
in the room. In this case the stove will manage
the power to ensure maximum comfort. Among
the functions of the electronic control unit there
is also that of being able to program the start-
up and shutdown of the stove, setting the weekly
chronothermostat.
All this can be done remotely, using the
application available for your phone.
5.6 AUTOMATIC CLEANING SYSTEM
The stove is equipped with autuomatic brazier
cleaning system. This means that there is no
need to carry out daily manual cleaning of the
brazier or every time the stove is lit. The automatic
cleaning system is activated every time the stove
is lit and after 6 hours of continuous operation.
The cleaning cycle, which involves shutting down,
automatic cleaning and restarting the stove,
takes about 10 minutes. During this period the
heating is guaranteed by the heat accumulated
by the appliance itself.
Note: the times indicated are those set by default
by the Manufacturer.
5.7 REFUELLING
During pellet loading prevent the pellet bag from
coming into contact with hot surfaces.
It is not recommended to empty the pellet bag
directly into the hopper to avoid depositing wood
sawdust on the bottom of the hopper.
To load the pellets inside the hopper, proceed as
described below:
STEP ACTION
1 Slide the top forward
2 Open the pellet hopper cover
3 Pour the pellets into the hopper
4 Close the pellet hopper cover
5 Slide the top back
Fig. 5.1
Fig. 5.2