Fujitsu AUU7RLF Design & Technical Manual page 26

 Switching remote controller custom code
Code selector switch eliminates unit being wrongly switched. (Up to 4 codes can be set.)
* I.U.: Indoor unit
 Temperature unit switchable
Easy to change the temperature unit between °F and °C by button operation.
After code change
Mixed-up A
I.U. I.U. I.U. I.U.
I.U.
A
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B C D
I.U. I.U. I.U.
B C D