Adjustment And Safety Devices - Baxi LUNA3 COMFORT HT Gebrauchsanleitung Für Den Benutzer Und Installateur

23. ADJUSTMENT AND SAFETY DEVICES

This boiler has been designed in full compliance with European reference standards and, in particular, it is fitted with the
following:
• Safety thermostat
By means of a sensor placed on the heating delivery line, the thermostat interrupts the flow of gas to the burner if the
water in the primary circuit overheats. In these conditions, the boiler is blocked and only after the fault has been eliminated
will it be possible to light it again by pressing the OK button (section 9.1).
It is forbidden to disable this safety device
• NTC fumes probe
This device is positioned on the fumes-water exchanger.
The electronic board blocks the flow of gas to the burner if the temperature exceeds 110°C.
Press the OK button (section 9.1) to re-establish normal operating conditions.
N.B.: the above reset operation is only possible if the temperature is less than 90°C.
It is forbidden to disable this safety device
• Flame ionisation detector
The flame sensing electrode guarantees safety of operation in case of gas failure or incomplete ignition of the main bur-
ner.
In these conditions, the boiler blocks.
Press the OK button (section 9.1) to re-establish normal operating conditions.
• Hydraulic pressure switch
This device allows the main burner to be ignited only if system pressure is higher than 0.5 bars.
• Pump post-circulation
The electronically-controlled pump post-circulation function lasts 3 minutes and is enabled, in the heating mode, if the
ambient thermostat causes the main burner to go out.
• Frost protection device
The electronic boiler management system includes a "frost protection" function in the heating and DHW modes which,
if delivery temperature falls below 5°C, operates the burner until a delivery temperature of 30°C is reached.
This function is enabled when the boiler is switched on, the gas supply is open and the system is correctly pressurised.
• Anti-block pump function
If no heat demand is received in the heating and/or DHW modes for 24 consecutive hours, the pump will automatically
start and operate for 10 seconds.
• Three-way valve anti-blockage function
If no heat demand is received for a period of 24 hours, the three-way valve performs a complete switching cycle.
• Hydraulic safety valve (heating circuit)
This device is set to 3 bar and is used for the heating circuit.
• Heating pump pre-circulation
In case of a heat demand in the heating mode, the appliance can pre-circulate the pump before the burner is ignited. This
pre-circulation phase last from 0 to a few minutes, depending on the operating temperature and installation conditions.
Connect the safety valve to a drain trap. Do not use it to drain the heating circuit.
N.B.:
the functions performed by the adjustment and safety devices are only operative if the boiler is switched on.
INSTRUCTIONS FOR FITTERS
74
926.420.3 - EN