Residual Risks; Fume Exhaust Safety; Combustion Chamber Overpressure Safety - Ravelli HR EVO 290 Manuel D'installation

The appliance must not be used by children under the age of 8 or by people with reduced physical, sensorial or
mental capacities or without experience or without the necessary knowledge, and always with supervision.
Arrange the power cable and any cables of external sensors so that they do not touch hot parts of the unit.
Do not operate the unit with the fire door and/or ash box door open.
Do not handle easily flammable or explosive substances near the boiler while it is in operation.
Do not touch the hot surfaces of the boiler without suitable protective equipment, to avoid getting burned. When
it is running, the outer surfaces reach hot temperatures to the touch.
Do not modify safety or adjustment devices without the manufacturer's express permission.
Before any maintenance, unplug the power supply from the boiler and operate only with a cold boiler.
In case of anomalies, the boiler can only be restored after restoring the cause of the problem and in any case, it is forbidden to disable
the safety systems.
Clean the brazier at regular intervals every time.
To prevent accumulation of smoke and unburned during ignition and / or during normal operation, excessive buildup of unburned
pellets in the brazier must be removed manually before proceeding with a new ignition.
Regularly carry out the boiler maintenance, at least once a year, planning timely intervention with the authorized service center
personnel.
In case of anomalies, the boiler can only be restored after restoring the cause of the problem, otherwise contact the service.
The manufacturer declines any liability for improper use of the boiler for damage caused by operations not
covered by the technical documentation.

Residual risks

The boiler was designed so as to guarantee the user's essential safety requirements.
Safety was integrated into the boiler's design and construction as much as possible.

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'.

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,
810
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
HR EVO 290 - 350 - 390
> 85°C
use and maintenance manual
Rev.1 16/03/2018
ENG
Pag.53
T2 T1