Fujitsu ARXG22KMLB Design & Technical Manual page 285

 SW6: Memory backup setting
Set to "ON" to use batteries for the memory backup.
When batteries are not used, all of settings stored in memory will be deleted if there is a power
failure.
SW6 Memory backup Factory setting
OFF Disable ♦
ON Enable
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14-6. Wired remote controller (UTY-RNNYM) 14. Function settings