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22. ADJUSTMENT AND SAFETY DEVICES
The boiler has been designed in full compliance with European reference standards and in particular is equipped with the following:
• Air pressure switch for forced-flow models (140Fi, 240Fi, 280Fi and 320Fi)
This device only allows the burner to ignite if the exhaust flue duct is in perfect working order.
In the event of one of the following faults:
• the flue terminal is obstructed;
• the venturi is obstructed;
• the fan is blocked;
• pressure switch is tripped
The boiler will stay on stand-by and the display shows error code 03E (see table in section 9).
• Flue thermostat for natural draught (240 i and 280 i)
This device has a sensor positioned on the left section of the fumes hood and shuts off the gas flow to the main burner
if the flue is obstructed and/or if there is no draught.
Under such conditions the boiler is blocked and only after the fault has been eliminated can it be ignited again
(see section 9).
It is forbidden to disable this safety device
• Safety thermostat
This device has a sensor positioned on heating delivery and shuts off the gas flow to the burner if the water in the primary
circuit is overheated. In these conditions the boiler is blocked and ignition can be repeated only after having removed the
cause of tripping (see section 9).
It is forbidden to disable this safety device
• Flame ionisation detector
The flame sensing electrode, located on the right-hand side of the burner, guarantees safety of operation in case of gas failure
or incomplete ignition of the burner.
In these conditions, the boiler is blocked after 3 ignition attempts. See section 9 to RESET normal operating conditions.
• Hydraulic pressure switch
This device allows the main burner to be ignited only if system pressure is higher than 0.5 bars
• Pump overrun for heating circuit
The electronically-controlled pump post-circulation function lasts 3 minutes (F17 - section 21) and is enabled, in the heating
mode, if the ambient thermostat causes the burner to go out.
• Pump overrun for DHW circuit
The electronically-controlled pump post-circulation function lasts 30 seconds and is enabled at the end of pump operation
in DHW mode.
• Frost protection device (heating and DHW systems)
The electronic boiler management system includes a "frost protection" function for the heating system which, when delivery
temperature falls below 5°C, operates the burner until a delivery temperature of 30°C is reached.
• Water not circulating in primary circuit (pump probably blocked or presence of air)
If there is insufficient or no water circulating in the primary circuit, the boiler blocks and the error code 25E is shown on the
display (section 9).
• Anti-block pump function
If no heat demand is received for 24 consecutive hours, the pump will automatically start and operate for 10 seconds.
This function is operative when the boiler is powered.
• Three-way valve anti-blockage function
If no heat demand is received for a period of 24 hours, the three-way valve performs a complete switching cycle. This function
is operative when the boiler is powered.
• Hydraulic safety valve (heating circuit)
This device is set at 3 bar and is used for the heating circuit.
Connect the safety valve to a drain trap. Do not use it to drain the heating circuit.
INSTRUCTIONS FOR FITTERS
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7864176 - en
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