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INSTRUCTIONS PERTAINING TO THE INSTALLER924.493.3

The boiler has been designed in full compliance with European reference standards and in particular is equipped with the

following

• Overheat 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 forbidden to disenable this safety device

• 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 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 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.

Figure 15

010905_0200

17. POSITIONING OF THE IGNITION AND FLAME SENSING ELECTRODE

16. CONTROL AND OPERATION DEVICES

Baxi Luna HT 1.650 User Manual

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