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925.476.4 - EN

INSTRUCTIONS PERTAINING TO THE INSTALLER

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 draught model

This switch allows the burner to switch on provided the exhaust flue duct efficiency is perfect.

In the event of one of the following faults:

• the flue terminal is obstructed;

• the venturi is obstructed;

• the fan is blocked;

• the connection between the venturi and the air pressure switch is interrupted;

The boiler will stay on stand-by and the display shows error code E03 (see section 9).

• Overheat safety thermostat

Thanks to a sensor placed on the heating flow, this thermostat interrupts the gas flow to the burner in case the water
contained in the primary circuit has overheated. Under such conditions the boiler is blocked and relighting will only be
possible after the cause of the anomaly has been removed.

It is forbidden to disenable this safety device

• Flame ionization detector

The flame sensing electrode, placed on the right of the burner, guarantees safety of operation in case of gas failure or
incomplete inter- lighting of the burner. The boiler is blocked after 3 relight attempt.

See section 9 to RESET normal operating conditions.

• Hydraulic pressure sensor

This device (2 - figure 20) enables the main burner only to be switched on if the system pressure is over 0.5 bars.

• Pump overrun for central heating circuit

The electronically-controlled supplementary running of the pump lasts 3 minutes (F17 - Section 20), when the boiler
is in the central heating mode, after the burner has switched off due to a room thermostat or intervention.

• Pump overrun for domestic hot water circuit

The electronic control system keeps the pump operating for 30 seconds in domestic hot water mode after the D.H.W.
sensor has switched off the burner.

• Frost protection device (central heating and domestic hot water systems)

Boilers electronic management includes a “frost protection” function in the central heating system which operates the
burner to reach a heating flow temperature of 30°C when the system heating flow temperature drops below 5 °C.

This function is enabled when the boiler is connected to electrical supply, the gas supply is on and the system pressure
is as required.

• Lack of water circulation (probable pump jammed)

If the water inside the primary circuit doesn’t circulate, the display shows E25 error (see section 9).

• Anti-block pump function

In the event that no heat is required, the pump will automatically start up and operate for one minute during the following
24 hours. This function is operative when the boiler is powered.

• Three-way anti-blockage valve

In the case of no heat is request for a period of 24 hours the three way valve carries out a complete commutation. This
function is operative when the boiler is powered.

• Hydraulic safety valve (heating circuit)

This device is set to 3 bar and is used for the heating circuit.

The safety valve should be connected to a siphoned drain. Use as a means of draining the heating circuit is strictly pro-

hibited.

Note:

Domestic Hot Water is guaranteed even if the NTC sensor (5 - figure 20) is damaged. In this case, the temperature

control is carried out by the boiler flow temperature.

21. CONTROL AND OPERATION DEVICES