Nordmann AT4 - Replacing the Backup Battery on the Control Board

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7.5 Replacing the backup battery on the control board
1. Set the Nordmann AT4 out of operation as described in chapter 4.4,
disconnect it from the mains and secure the unit against inadvert-
ent power-up.
2. Undo the screw of the front cover of the control compartment, then
remove the front cover.
CAUTION!
The electronic components inside the humidier are very sensitive to
electrostatic discharge. Before carrying out the next step, appropriate
measures must be taken to protect the electronic components against
damage caused by electrostatic discharge (ESD protection).
3. Carefully liftoff the display and control unit from the housing frame,
swivel it 90° to the left, then x it to the unit frame again.
4. Undo the fastening screws of the control board, then carefully pulloff
the control board from the control unit assembly.
5. Replace the backup battery (CR2032, Lithium 3V).
6. Reassemble the unit in reverse order.
7. If necessary set date and time (see chapter 5.4.9 and 5.4.10).
WARNING! Environmental hazard!
The old battery must be returned to an authorised collecting
point for correct disposal/recycling in accordance with local
regulations. In no case the old battery must be disposed of
in the domestic waste or into the environment.