Fujitsu AJ 126LELDH Series Design & Technical Manual page 847

 Entering setting mode
1. Press and hold the 3 buttons of MENU, <, and ENTER at the same time for 2 seconds or
longer. Initial display of the setting mode will be displayed.
2. In Menu 2 settings, select "13" by pressing < or > button.
3. Press ENTER button.
1-4. Address setting by remote controller
Setting mode initial display
- (07-51) -
1. System settings