31
Instructions for the installer
4.9 - WARNINGS
HOW TO AVOID CORROSION IN THE FIRE WOOD STORAGE
The use of wood with a high moisture content
(higher than about 25%)
and/or loadings not
proportioned to the system’s heat request (long
OFF periods with the wood storage full) can
cause considerable condensate formation in
the wood storage’s internal wall.
Check, once a week, the internal steel walls of the wood storage
room: they must be covered by a slight layer of dry tar, opaque
coloured, with bubbles tendind to break and fall off.
On the contrary, if the tar is bright, runny and, if removed with
the fire stoke, some liquid appears, it is necessary to use wood
with a lower moisture content and/or to reduce the quantity of
the wood when loading the boiler.
If, in despite of these interventions the tar does not dry, you must
inform of this the local After Sales Service.
Corrosion is not covered by the guarantee, because it is
caused by a bad use of the boiler (wet wood, excessive
loadings, etc.).
CORROSION IN THE SMOKE CIRCUIT
The smokes are rich in water steam, due to combustion and the
use of wood which always retains water.
If the smoke come into contact with relatively cold surfaces
(having a temperature below 60 - 70 °C), the water steam con-
densates and, in combination with other combustion products,
originates corrosion phenomena of the metallic parts.
Every day check if there are signs of smoke condensation (black
liquid on the floor and behind the boiler). In this case you must use
a wood with a lower moisture content; check that the recirculation
pump is working correctly and the smoke temperature at part
load, and increase the working temperature. In order to control
the room temperature it is therefore necessary to install a mixing
valve.
The corrosion
caused by the smoke condensation is
not covered by the
guarantee, because it is caused by the
wood’s moisture content and the
way the boiler is used.
PRECAUTIONS TO BE TAKEN DURING BOILER OPERATION
4.8 - CHECKS TO BE CARRIED OUT AFTER
THE FIRST START
CHECKING SEALS
During the initial start-up check the tightness
of the smoke circuit and the connection to the
chimney. If there is any noticeable smoke leaks
alert the installer and / or the authorized After
Sale Service. If there is any noticeable aspira-
tion of air through the door seals, tighten the
handle with greater force.
Check the proper operation of the thermostat, Te (32) at full
capacity (chapter 3.12) up to stop the fan.
Check for leaks from pipe connections.
After the initial start, with the boiler off, open the lower door
and inspect the internal walls and insulation of the door: they
should be of a light colour, indicative of a proper air adjust-
ment.
Otherwise, if the walls are blackened, it will mean a wrong
adjustment of secondary air (chapter 4.7 and 4.9).
GENERAL ADVICES
- Best performances are obtained after two/three days of ope-
ration. Refractory material must be cooked and the tar must
encrust the walls of the wood storage room.
- The flame should have a good size and fairly fill the combu-
stion chamber.
- The flame shouldn‘t be too red (lack of secondary air S).
- The flame shouldn‘t be too blue (excess of second. air S)
- The flame should not be too noisy (excess of primary air P)
- The flame must not be too small (lack of primary air P).
- If the ash doesn‘t go down well increase the primary air P).
- If too much ash falls decrease theprimary air P).
- If the chimney is smoking (open completely the secondary
air S).
- If it continues smoking give max. secondary air S, and even
close partially the primary air P).
AIR ADJUSTMENT FAULTS
1) If
the primary air is excessive
a lot of ash and small pieces
of embers will fall through the slot into the combustion chamber:
the flame is too fast, dry, of a cold colour and makes noise.
The boiler is consuming a lot of wood and the door’s refractory
insulation is white.
2) If
the primary air is insufficient
the flame will be slow, hesi-
tant, influenceable by air currents and by the chimney draught,
very small, incapable of touching the lower cradle, with low ash
production and the door’s refractory insulation will be of a dark
colour.
3) If
the secondary air is excessive
the flame will be small, of
a blueish colour and very transparent.
4) If
the secondary air is insufficient
the flame will be big, it will
touch the lower cradle, it will completely fill the combustion cham-
ber and, above all, it will be of a red colour and not transparent
The condensate inside the firewood storage room
causes the corrosion of the steel plate.
