BAXI - 925.200.1
20
GB
HU
CZ
INSTRUCTIONS PERTAINING TO THE INSTALLER
925.492.2
21. CONTROL AND OPERATION DEVICES
The boiler has been designed in full compliance with European reference standards and in particular is equipped with the following:
•
Air pressure switch for forced draught model (240Fi - 310 Fi)
This switch allows the burner to switch on provided the exhaust fl ue duct effi ciency is perfect.
In the event of one of the following faults:
• the fl ue terminal is obstructed;
• the venturi is obstructed;
• the fan is blocked;
• the connection between the venturi and the air pressure switch is interrupted;
The boiler will stay on stand-by and the display shows error code E03 (see section 9).
• Overheat safety thermostat
Thanks to a sensor placed on the heating fl ow, this thermostat interrupts the gas fl ow to the burner in case the water contained in the
primary circuit has overheated. Under such conditions the boiler is blocked and relighting will only be possible after the cause of the
anomaly has been removed.
It is forbidden to disenable this safety device
• Flame ionization detector
The
fl ame sensing electrode, placed on the right of the burner, guarantees safety of operation in case of gas failure or incomplete inter-
lighting of the burner. The boiler is blocked after 3 relight attempt.
See section 9 to RESET normal operating conditions.
• Hydraulic pressure sensor
This device (3 - fi gure 20) enables the main burner only to be switched on if the system pressure is over 0.5 bars.
• Pump overrun for central heating circuit
The electronically-controlled supplementary running of the pump lasts 3 minutes (F17 - Section 20), when the boiler is in the central
heating mode, after the burner has switched off due to a room thermostat or intervention.
• Pump overrun for domestic hot water circuit
The electronic control system keeps the pump operating for 30 seconds in domestic hot water mode after the D.H.W. sensor has
switched off the burner.
• Frost protection device (central heating and domestic hot water systems)
Boilers electronic management includes a “frost protection” function in the central heating system which operates the burner to reach
a heating fl ow temperature of 30°C when the system heating fl ow temperature drops below 5 °C.
This function is enabled when the boiler is connected to electrical supply, the gas supply is on and the system pressure is as required.
• Lack of water circulation (probable pump jammed)
If the water inside the primary circuit doesn’t circulate, the display shows E25 error (see section 9).
• Anti-block pump function
In the event that no heat is required, the pump will automatically start up and operate for one minute during the following 24 hours. This
function is operative when the boiler is powered.
• Three-way anti-blockage valve
In the case of no heat is request for a period of 24 hours the three way valve carries out a complete commutation.
This function is operative when the boiler is powered.
• Hydraulic safety valve (heating circuit)
This device is set to 3 bar and is used for the heating circuit.
The safety valve should be connected to a siphoned drain. Use as a means of draining the heating circuit is strictly prohibited.
Note:
domestic hot water is guaranteed even if the NTC sensor (5 - fi gure 20) is damaged. In this case, the temperature control is
carried out by the boiler fl ow temperature.
