10
User operating instructions
6.9 - WARNINGS
HOW TO AVOID CORROSION IN THE
WOOD STORAGE COMPARTMENT
The use of wood with a high moisture content (higher
than about 25%) and/or loads not proportioned to
the system’s heat request (long OFF periods with the
wood storage full) can cause considerable condensate
formation in the storage compartment’s internal wall.
Check the steel walls of the upper wood storage once
a week.
They must be covered by a slight layer of dry tar, opaque
coloured, with bubbles tending to break and fall off.
On the other hand, the tar will have a glossy, runny
appearance and liquid will appear if it is removed with
a poker: accordingly, it is necessary to use wood that is
less damp and/or reduce the amount of loaded wood.
If, despite these interventions, the tar does not dry, you
must inform the local After-Sales Service.
T h e c o n d e n s a t e i n s i d e t h e f i re w o o d s t o r a g e
compartment causes the steel sheets to corrode.
Corrosion is not covered by the warranty, as it is caused
by improper use of the boiler (wet wood, excessive
loading, etc.).
CORROSION OF THE FLUE CIRCUIT
Flue gas is rich in water vapour, due to combustion and
the use of wood which retains water.
If the fl ue gas comes into contact with relatively cold
surfaces (having a temperature below 60 - 70 °C), the
water vapour condensates and, combining with other
combustion products, originates corrosion of the
metallic parts.
Check daily whether there are signs of flue gas
condensation (black liquid on the fl oor and behind the
boiler). In this case you must use wood with a lower
moisture content; check that the recirculation pump is
working correctly and the fl ue gas temperature at partial
load, and increase the working temperature. In order to
control the room temperature, it is therefore necessary
to install a mixer valve.
The corrosion caused by the
fl ue gas condensation is not covered by the warranty,
as it is caused by the wood’s moisture content and
the way the boiler is used.
WARNINGS DURING USE
Every time the air is adjusted, wait 5-10 minutes before
proceeding with the next adjustment
. When you have
established the best air adjustment, at the end of the
day, check the surfaces of the combustion chamber and
the door insulation as they should be white.
There must be only a few unburnt embers in the ash
deposited in the cradle. If there is too much primary
air, there will be ember and small pieces of coal in the
ashes, the fl ame will be quick, dry, a cooler colour and
will make more noise, with excessive power (chap. 6.7).
If the primary air is insuffi cient, the fl ame will be slow,
small, it will not caress the lower cradle, dragging few
ashes and the heat output will be insuffi cient.
If the flame is dark orange, the secondary air is
insuffi cient and the surfaces of the combustion chamber
will not be white; if it is small and blue, there is too much
secondary air.
Always open the loading door and the internal anti-
smoke door slowly.
If despite this warning there are blowbacks, you must
use large logs which are a bit moister, make sure the
boiler is not stopped for too long (reduce primary air -
par. 6.7) and check whether any grates are broken. Also
check that foreign objects (nails, metal pieces) have not
obstructed the refractory burner hole.
6.10 - SUMMER MODE
The use of the boiler in summer only for the production
of domestic hot water is not advised, unless you follow
these rules meticulously:
1) Use very dry wood.
2) Load a small amount of wood in the boiler 2 or 3
times a day as needed.
Important.
It is very wrong to load the boiler completely, providing
it with long self-suffi ciency (for example 24 hours). This
way the boiler (with the fan stopped) would produce
much acid condensation corroding the wood storage
compartment.
