Daikin 4MXS-R Series Service Manual page 246

Field Settings
5.2.2 Temperature Display Switch
You can select Fahrenheit or Celsius for temperature display.
ARC452A21, ARC452A23
ARC466A21, ARC466A36
233
Press TEMP and TEMP
temperature display.
Press the upper side of Temp button and On button at the same time for 5 seconds to change
the unit of temperature display.
buttons at the same time for 5 seconds to change the unit of
SiUS121736EA
(R14477)
(R22009)
Trial Operation and Field Settings