Why does the JOY room control unit show the wrong time after a power failure?

The room control unit JOY is equipped with a real-time clock. This clock provides the real time even after a power failure.

 

If this power failure occurs shortly after the commissioning, the energy storage of the real time clock has not been charged sufficiently.

If the time has been set once and the JOY room control unit has run for min. 24h, it will be able to bridge about 4 days without power supply and running the real-time clock. After power on it will still display the real time.



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