Control And Operation Devices; Positioning Of The Ignition And Flame Sensing Electrode - Baxi LUNA HT 1.450 Gebrauchsanleitung Für Den Verbraucher Und Den Installateur

16. Control and operation
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17. Positioning of the ignition
and flame sensing electrode
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The boiler has been designed in full compliance with European reference standards and in particular
devices is equipped 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 3 minutes, when the boiler
is in the central heating mode, after the burner has switched off due to a room thermostat inter-
vention.
• 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.
Figure 15
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