Selve commeo Timer BT Operating Instructions Manual page 35

Installation
Installation steps
1. Switch off the voltage of the cables in the junction box.
2. Remove the protective caps at the power supply unit.
3. Connect the power supply unit according to your application
according to the following connection diagram.
4. Put the protective caps back on the power supply unit.
5. Fix the power supply unit in the box.
6. Insert the battery CR2032 on the backside of the operating device.
(The battery is only used for the buffering of the time during a
power failure.)
7. Put the operating device in the frame and plug it into the power
supply unit.
8. Switch on the voltage in the junction box.
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