Combustion Chamber Overpressure Safety; Safety Against Flare-Back In The Pellet Chute - Ravelli HR EVO 200 SMART Manual De Uso Y Mantenimento

switches off the auger rotation motor, signalling the anomaly with
a message on the control panel 'AL8 NO NEG PRESS' or 'AL9
INSUF DRAUGHT'.

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.
Overheating - safety thermostats 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:
- T - heating chamber water temperature thermostat
- T - pellet chute temperature thermostat
• Restart the boiler normally.
Pellet hopper thermostat activation temperature:> 85°C
Heating chamber thermostat activation temperature:>
95°C

Safety against flare-back in the pellet chute

The solutions preventing flare-back are:
Use and maintenance manual
HR EVO 200-250 SMART
Rev.0 21/12/2020
Pag.15
T2
T1