Ferroli TERMO MODENA Manuel D'installation page 39

3.2 Fume exhaust safety
In normal operation the combustion chamber is in a negative pressure, guaranteeing seal against possible smoke
leaks in 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 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 overpressures in the combustion fumes inside the chamber and fume exhaust ducts are
discharged by opening of the safety valves located on the heat exchanger. During normal operation these valves
are kept closed by their weight and the negative pressure in the combustion chamber, guaranteeing a seal against
any smoke escaping.
Periodically check closing, the integrity of the device and its operation.
3.4 Overheating - safety thermostats
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.
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the siphon shape of the pellet chute.
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the hopper temperature safety see par. 3.4
3.6 Overcurrent protection device
The unit is protected against overcurrent by 2A fuses on the power supply of the main stove switch located at the
back.
3.7 Power failure safety
A temporary power failure does not limit stove safety and the hopper temperature does not reach high values
(< 85°C), given the small quantity of pellets burning in the brazier.
This anomaly can result in some smoke briefly escaping into the room, which does not involve any risk.
Do not tamper with the safety devices.
3.8 Plumbing circuit overpressure safety
A possible overpressure of the water inside the chamber, by P>3 bar, is discharged through activation of the safety
valve installed in the plumbing system inside the stove.
Do not tamper with the safety devices.
3.9 Fume extractor fan failure
If the fume extractor fan stops for any reason, the electronic controller instantly stops the pellet feed, displaying the
message 'AL4 FAN FAIL'.
On the front and bottom of the hopper, and precisely 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 stove to cool down rapidly. The fault is
displayed on the control panel with a message 'AL 7 THERMAL SAF'. In case
of activation, proceed as follows:
►
Allow the stove to cool down for at least 45 minutes.
►
Reset the thermostat by pressing the button near the switch on the back of
the stove (figure opposite).
►
Restart the stove normally.
Pellet hopper thermostat activation temperature: > 85°C
Heating chamber thermostat activation temperature: > 95°C
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TERMO MODENA