Safety Devices - Ferroli NATURFIRE EVO 27 Instrucciones De Uso, Instalación Y Mantenimiento

3.2 SAFETY DEVICES

To ensure total safety of the user, the boiler is fitted with a number of safety devices.
Device
Fume exhaust safety
Combustion
chamber
overpressure safety
Overheating -
Safety thermostats
Safety against flare-
back in the pellet
chute
Overcurrent
protection device
Water circuit
overpressure safety
Fume extractor fan
failure
Opening safety
device for fire-door
ash-door
54
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 that switches off the auger rotation
motor, signalling the anomaly with a message on the control panel
"AL8 NO NEG PRESS" or "AL9 INSUF DRAUGHT".
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.
There are two temperature probes connected to the respective
safety thermostats which, in case of overheating, automatically
switch off pellet feed. 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: > 85°C
Heating chamber thermostat activation temperature: > 95°C
The solutions preventing flare-back are:
▪ negative pressure in the combustion chamber.
▪ the siphon shape of the pellet chute.
▪ the hopper temperature safety.
The unit is protected against overcurrent by 2A fuses on the power
supply of the electronic card.
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.
If the fume extractor fan stops for any reason, the electronic
controller instantly stops the pellet supply, displaying the message
"AL4 FAN FAIL".
The safety microswitch operates when it detects fire door or ash
door opening, during normal boiler operation, the electronic control
instantly stops the pellet supply, displaying the message "AL M
DOOR OPEN".
cod.48427M013_11/19
NATURFIRE EVO 27 - 34
Description
EN