Boiler Safety; Safety Distance From Flammable Materials; Fume Exhaust Safety; Combustion Chamber Overpressure Safety - Cola DOMUSFIRE C17 Manuel D'installation, D'utilisation Et D'entretien

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BOILER SAFETY

3.1 Safety distance from flammable materials

To prevent the risk of fire, unit positioning must respect a minimum distance from flammable materials, according to
that given in the technical table of the manual and on the data plate.
Pay attention to the type of floor and ceiling-covering in the place of installation: for delicate and flammable materials
it is advisable to use adequate thermal diaphragms or panels (see par. 2.2 ).

3.2 Fume exhaust safety

In normal operation the combustion chamber is in a negative pressure, guaranteeing seal against any smoke leaks
into the room. If a certain vacuum level is not reached or the fume exhaust outlet is blocked, the vacuum switch
detects the lack of a negative pressure inside the combustion chamber or the air flow meter detects a lack of
combustion air flow and, through the electronic controller, switches off the auger rotation motor, signalling the
anomaly with a message on the control panel 'AL8 NO NEG PRESS' or 'AL9 INSUF DRAUGHT'.

3.3 Combustion chamber overpressure safety

Any and/or sudden combustion fume overpressures inside the chamber and fume exhaust ducts are discharged by
opening of the safety valves located above the ash door. During normal operation these valves are kept closed by
their weight and the negative pressure in the combustion chamber, ensuring a seal against any smoke escaping.
Periodically check closing, the integrity of the device and its operation.

3.4 Overheating - safety thermostats

T1
T2

3.5 Safety against flare-back in the pellet chute

The solutions preventing flare-back are:
- negative pressure in the combustion chamber see par. 3.2.
- the siphon shape of the pellet chute.
- the hopper temperature safety see par. 3.4.

3.6 Overcurrent protection device

The unit is protected against overcurrent by 2A fuse/s on the power supply of the main boiler switch located at the
back.

3.7 Water circuit overpressure safety

Any overpressure of the water inside the chamber, by P>3 bar, is discharged through activation of the safety valve
installed in the hydraulic system inside the stove.
Do not tamper with the safety devices.

3.8 Fume extractor fan failure

If the fume extractor fan stops for any reason, the electronic controller instantly stops the pellet supply, displaying the
message 'AL4 FAN FAIL'.
On the bottom of the hopper, and namely on the pellet chute and on the top part
of the heating chamber, there are two temperature probes connected to the
respective safety thermostats that automatically shut off the pellet supply in case
of excessive heating. In this case the extractor and/or fans continue working,
allowing the unit to cool down rapidly. The fault is displayed on the control panel
with the message 'AL 7 THERMAL SAF'. In case of activation, proceed as
follows:
- Allow the boiler to cool down for at least 45 minutes.
- Reset the thermostat by pressing the button near the switch behind the boiler
(figure opposite) after removing the protection, and namely:
T1 - heating chamber water temperature thermostat
T2 - pellet chute temperature thermostat
- Restart the boiler normally.
Pellet hopper thermostat activation temperature :
Heating chamber thermostat activation temperature : > 95°C
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> 85°C
DOMUSFIRE C17-C24 HR