11
The wood must have the following length:
a) 50 cm (+ 1 cm, - 4 cm)
for model FIREX 34
b) 50 cm (+ 1 cm, - 4 cm)
for models FIREX 45
c) 70 cm (+ 1 cm, - 4 cm)
for model FIREX 55
tagliare
=
=
L
L
6.7 - COMBUSTION AIR
MODULATION
PRIMARY AND SECONDARY AIR ADJUSTMENT
The FIREX boiler is equipped with a combustion air intake
fan, a combustion air adjustment unit (pos. 1) and primary
air (pos. P) and secondary air regulators (pos. S).
When commissioning the boiler, the primary and sec-
ondary air need to be adjusted bearing in mind that the
primary air determines the boiler heat output and therefore
the amount of wood that is burned, and the secondary air
completes combustion.
The following are the optimal adjustments of primary and
secondary air using good quality wood (beech) with low
moisture content (15%).
These measurements must always be strictly com-
plied with.
As even wood feeding is essential for good combustion,
it is necessary to ensure the length of the wood logs fed,
their shape and the manner of loading do not prevent
regular feeding of the fuel.
The wood logs must be placed lengthwise and horizontally.
No log should be tilted or placed sideways.
Once you have checked flame inversion, it is possible to
proceed with further loading (bear in mind that the primary
and secondary air adjustment indications in the table are
approximate).
FURTHER LOADING
Before loading wood once again, consume the previous
one as much as possible.
You can add more wood when the bed of embers in the
firewood compartment is about 5 cm deep.
Open the loading door and the internal anti-smoke door
slowly.
It is necessary to use wood logs with the length stated in
the previous paragraph.
Place the new wood logs as described above.
USEFUL TIPS AND WHAT TO AvOID
- Logs which are too long do not fall down properly and
can cause "bridges".
- Logs which are too short cause irregular air ducts, with
consequent reduction in output and efficiency.
- If the quality of the wood causes "bridges", it could
become necessary to load logs cut in half so that the
total length “L” is as indicated in the previous paragraph.
To avoid the formation of "bridges", it is unadvisable to
place logs against the side walls of the wood storage
compartment.
- Always open the upper door slowly, in order to avoid
blowbacks and smoke formation.
During normal operation, it is strictly
forbidden to open the lower door
.
primary air
secondary air
pos.
pos.
FIREX 34
3÷4
~1
FIREX 45
4÷5
1÷2
FIREX 55
3÷4
1÷2
For proper air adjustment based on the type of wood used
and its actual moisture level, it is necessary to observe the
flame through the flame sight glass placed on the lower
door. The flame should fill about two-thirds of the lower
combustion chamber and gently lap the bottom cradle,
without dragging too much ash and without noise.
The flame must have an orange-pink-white colour, it must
not too transparent and the centre should tend towards
blue.
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