ABB ACH550-01 User Manual page 382

Control panel
Cleaning
Use a soft damp cloth to clean the control panel. Avoid harsh
cleaners which could scratch the display window.
Battery
The battery keeps the clock operating in memory during power
interruptions.
The expected life for the battery is greater than ten years. To
remove the battery, use a coin to rotate the battery holder on the
back of the control panel. Replace the battery with type CR2032.
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ACH550 User's Manual
Diagnostics and maintenance