Ferlux FLORA 7 - FUEL; WHAT ARE WOOD PELLETS?; PROPERTIES OF WOOD PELLETS

15
4. FUEL
The FERLUX wood pellet heater has been designed to burn wood pellets that comply with the requirements established
in Regulation UNE-EN ISO 17225:2014 regarding Solid biofuels and in Regulation ONORM M 7135.
4.1 WHAT ARE WOOD PELLETS?
Wood pellets are a combustible fuel that are made by pressing natural dry sawdust. The sawdust is easily compacted and
the lignin of the material itself acts as a binder, meaning that no glue or other substance is required. This process lends them
a shiny appearance, as though they had been varnished, and makes them denser.
They are very small cylinders that measure just a few millimetres in diameter. Their level of humidity is very low and,
furthermore, they require little storage space (in order to produce the same amount of heat, around three times less volume
of wood pellets is required when compared to rewood).
4.2 PROPERTIES OF WOOD PELLETS
There are various types of wood pellet on the market and they are of varying quality and have di󰀨erent characteristics in
their manufacturing processes and types of wood used.
As was stated previously, this heater is designed to operate with DINplus size wood pellets (marking obtained according to
Austrian regulation Onorm M 7135) and ENplus (marking obtained according to Regulation UNE-EN ISO 17225-2:2004).
The main requirements of these aforementioned regulations are:
Characteristics of the wood pellet according to DINplus and ENplus regulations
Requirement Unit of measurement DINplus ENplus
Diameter mm 4 ≤ D < 10
D06: 6 ± 1
D08: 8 ± 1
Length mm ≤ 5 x D 3,15 ≤ L ≤ 40
Lower caloric value MJ/kg (b.h) Q ≥ 18 (MJ/kg en b.s.) 16,5 ≤ Q ≤ 19
Humidity % (b.h) ≤ 10
Ash % (b.s) ≤ 0,5 ≤ 0,7
A wood pellet that has gained certication under either of these two regulations is the best way to assure the proper
functioning of the FERLUX wood pellet heater.
If the wood pellet does not come suitably marked, the appropriate certicate must be requested.
If faced with an unidentied wood pellet, or one which, due to a variety of circumstances, could be deemed to have di󰀨erent
characteristics, there are a series of criteria that can be applied to judge whether or not it is suitable for use, for which you
should be guided by the following advice:
• DO NOT USE pellets with di󰀨erent dimensions than those stated in the previous table.
• DO NOT USE pellets that show coloured grains that do belong to the wood or which are excessively dark.
• DO NOT USE damp pellets.
• DO NOT USE pellets that contain mixed sawdust, resins, or chemical substances, binders, or additives.
The use of unsuitable fuels causes:
• The build-up of pellets in the brazier.
• Dirtiness in the brazier and smoke evacuation ducting.
• Poor combustion.
• Dirty glass.
• Reduction in the performance of the unit.
• Increased consumption of pellets.
• Normal operation of the heater not to be guaranteed.
• Needing to perform more frequent cleaning and maintenance of the heater.