Control And Operation Devices - Baxi ECO 3 Instructions Manual

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:
• Central heating temperature adjustment potentiometer (
This potentiometer sets the central heating flow max. temperature. Its temperature range goes from 30 °C min. to 80 °C max. To
increase the temperature turn knob (2 - figure 1) clockwise and anti clock wise to decrease it.
• Domestic hot water temperature adjusting potentiometer (
This potentiometer sets the domestic hot water max. temperature. Its temperature range goes from 35 °C min. to 60 °C max according
to the water inlet flow rate.
To increase the temperature turn knob (1 - figure 1) clockwise and anticlockwise to decrease it.
note:
domestic hot water is guaranteed even if the NTC sensor is damaged. In this case, the temperature control is carried out by
the boiler flow temperature.
• Flue pressure switch for forced draught model (240 Fi - 1.240 Fi - 280 Fi)
This switch allows the burner to switch on provided the exhaust flue duct efficiency is perfect.
In the event of one of the following faults:
• the flue 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 out error code E03 (see table on section 10).
• Flue thermostat for natural draught
This device has a sensor positioned on the left section of the flue extraction hood and shuts off the gas flow to the burner if the flue
duct is obstructed or in the event of draught failure.
Under such conditions the boiler is blocked and the display shows E03 error (see section 10).
To relight the main burner immediately, place the selector switch (figure 2) on " " position for at least 2 seconds.
It is forbidden to disenable this safety device
• Overheat safety thermostat
Thanks to a sensor placed on the heating flow, this thermostat interrupts the gas flow to the burner in case the water contained in
the primary system has overheated. Under such conditions the boiler is blocked and relighting will only be possible after the cause of
the anomaly has been removed.
Turn the selector (figure 2) to ( ) for at least 2 seconds to RESET normal operating conditions.
It is forbidden to disenable this safety device
• Flame ionization detector
The flame sensing electrode, placed on the right of the burner, guarantees safety of operation in case of gas failure or incomplete
interlighting of the burner. Under such conditions the boiler is blocked.
Turn the selector (figure 2) to ( ) for at least 2 seconds to RESET normal operating conditions.
• Hydraulic pressure sensor
This device 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 180 seconds, 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 flow temperature of 30°C when the system heating flow 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 requi-
red.
• Lack of water circulation (probable pump jammed)
If the water inside the primary circuit doesn't circulate, the display shows E03 error (see section 10).
• Anti-block pump function
In the event that no heat is required (during heating and/or sanitary mode), 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.
instructions pertaininG to the
)
(models 240 i - 1.240 i)
instaLLer
17
)
924.674.3 - GB