USER INSTRUCTIONS
Behaviour on the failure and reinstatement
of the bus power supply
When the bus power supply fails, the device performs no actions.
The time and date are maintained by the buffer power system (rechargeable battery)
whilst all the other settings are saved to a non-volatile memory.
When the power is supplied by battery only, the device has an autonomy of 36 hours in
the following conditions:
• display time active;
• measure and temperature display not active (dashes are displayed);
• backlighting not active;
• front keys are not enabled (except for the simultaneous pressing of FAN and SET).
When there is no bus power the simultaneous pressing of FAN and SET for 2 seconds will
cause the rechargeable battery to disconnect inside the device.
This function is used to conserve the efficiency of the battery when the device is not
used for a long period. The battery is then automatically reconnected when the device
receives power from the bus. The set programs are not lost when there is a failure in the
bus connection or when the battery is disconnected.
The device is in full operation mode within a maximum of 5 seconds from
reinstatement of the bus power supply.
If the buffer power (rechargeable battery) is absent or disconnected, the thermostat
will restart in OFF mode when the bus power is reinstated.
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