Control And Operation Devices - Baxi Luna HT 1.850 Gebrauchsanleitung

16. Control anD operatIon DevICes

The boiler has been designed in full compliance with European reference standards and in particular is equip-
ped with the following
• overheat thermostat
Thanks to a sensor placed on the heating flow, this thermostat interrupts the gas flow 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 forbidden to disenable this safety device
• Flue thermostat
This device, positioned on the flue inside the boiler, interrupts the flow 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 flame sensing electrode guarantees safety of operation in case of gas failure or incomplete interlighting
of the main burner.
Under such conditions the boiler is blocked.
you must press the reset button on the boiler to restore the normal operating conditions.
• supplementary running of the pump
The electronically-controlled supplementary running of the pump lasts 10 minutes, when the boiler is in the
central heating mode, after the burner has switched off due to a room thermostat intervention.
• Frost protection device
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 as long as the boiler is connected to the a.c. power and gas supplies and the
pressure in the system is as specified.
• 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.
InstructIons pertaInInG to the InstaLLer
106
912.198.1 - GB