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30
910.026.1 - EN (AUS)
ISTRUCTIONS PERTAINING TO THE INSTALLER
The boiler has been designed in full compliance with European reference standards and in particular is equipped
with the following:
• Overheat safety thermostat
Thanks to a sensor placed on the heating ow, this thermostat interrupts the gas ow to the main burner in
case the water contained in the circuit has overheated. Under these conditions the boiler locks out and you
can only repeat the ignition procedure by pressing the reset button on the boiler after you have remedied
the cause of the trip.
It is strictly forbidden to disable this safety device.
• Boiler circuit circulation test
The boiler electronic management unit is tted with a “boiler circulation test” function which involves con-
tinuously checking the primary circuit delivery and return temperatures. In case of an irregular increase in
the delivery and return temperature or a temperature reversal, the boiler stops and signals the error on the
display (see error table).
• Flue thermostat
This device, positioned on the ue inside the boiler, interrupts the ow of gas to the burner if the temperature
exceeds 90 °C. After verifying the cause of the trip, press the reset button positioned on the thermostat
itself, then press the release button on the boiler.
It is forbidden to disenable this safety device
• Flame ionization detector
The ame sensing electrode guarantees safety of operation in case of gas failure or incomplete interlighting
of the main burner.
Under such conditions the boiler is locked out.
You must press the reset button on the boiler to restore the normal operating conditions.
• Pump overrun
The electronic control system keeps the pump operating for 3 minutes in central heating mode after the
room temperature thermostat has switched off the main burner.
• Frost protection device
Boilers electronic management includes a “frost protection” function in the central heating system which
operates the burner to reach a heating ow temperature of 30°C when the system heating ow temperature
drops below 5 °C.
This function is enabled as long as the boiler is connected to the a.c. power and gas supplies and the
pressure in the system is as speci ed.
• Pump-blocking prevention
In case there is no call for heat either from the central heating system or from the DHW system for 24 hours
on end the pump will automatically switch on for 10 seconds.
• Hydraulic pressure sensor
This device enables the main burner only to be switched on if the system pressure is over 0.5 bar.
15. CONTROL AND OPERATION DEVICES
