I reverse engineered the codes sent from the AR-RY16 remote control that came with my Fujitsu AC. I would expect these codes to work with any Fujitsu AC and they might work with other brands as well.

The Fujitsu remote sends out a 16 byte command string that contains the values of every AC parameter, even if only one item changed. (Although there are three short 6-byte command codes to turn off the AC and step the horizontal and vertical vanes.) I have programmed a subset of these into my Pronto remotes and you can find my
configuration in the Pronto files section.