13
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, if the tar looks glossy, runny and liquid
appears if removed with a poker: accordingly, wood that
is less damp must be used and/or the amount of loaded
wood must be reduced.
If, despite these measures, the tar does not dry, it is ob-
ligatory to report the anomaly to the After-Sales Service.
The condensate inside the firewood storage 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 load-
ing, 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 flue gas comes into contact with relatively cold sur-
faces (having minimum temperature below 60 - 70 °C),
the water vapour condensates and, combining with other
combustion products, leads to corrosion of the metal parts.
Check daily whether there are signs of flue gas conden-
sation (black liquid on the floor and behind the boiler). In
this case wood with a lower moisture content must be
used; check recirculation pump operation and the flue gas
temperature at partial load, and increase the operating
temperature. In order to control the room temperature,
it is therefore necessary to install a mixing valve.
The
corrosion caused by the flue 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, which should be white.
There must be only a few unburnt embers in the ash de-
posited in the cradle. If there is too much primary air, there
will be embers and small pieces of coal in the ashes, the
flame will be quick, dry, a cooler colour and will be noisier,
excessively powerful (chap. 6.7).
If the primary air is insufficient, the flame will be slow,
small, it will not caress the lower cradle, dragging few
ashes and the heat output will be insufficient.
If the flame is dark orange, the secondary air is insufficient
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 broken grates or foreign objects (nails,
metal pieces) have 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 advisable, unless the boiler
is run strictly following these rules:
1) Use very dry wood.
2) Load a small amount of wood in the boiler 1 or 3 times
a day as needed.
Important.
It is very wrong to load the boiler completely, providing it
with long self-sufficiency (for example 24 hours). This way
the boiler (with the fan stopped) would produce much acid
condensation corroding the wood storage compartment.
