Ferroli AT 18 Manual De Instalación, Uso Y Mantenimiento página 43

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:
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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'.
4 STOVE USE
4.1 Introduction
The pellet stove has the advantage of combining the heat generated by the combustion of wood with the
convenience of automatic water temperature management and the possibility of weekly programming of switching
on/off, as well as the connection of a thermostat and/or chronothermostat and start-stop remote control.
For safe and reliable use:
- when lighting and using the unit the first time, unpleasant odours may be created, therefore air the room
thoroughly;
- the hopper must only be filled with good quality pellets; make sure the bag does not come into contact with the hot
surfaces of the stove ;
- do not put any fuel other than the prescribed pellets in the hopper;
- the unit must not be used as a waste incinerator;
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:
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Allow the stove to cool down for at least 45 minutes.
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Reset the thermostat by pressing the button near the switch on the
back of the stove (figure opposite).
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Restart the stove normally.
Pellet hopper thermostat activation temperature: > 85°C
Heating chamber thermostat activation temperature: > 95°C
43 AT 18