Hitachi ZW 120-6 Operator's Manual page 129

 Temperature Control Switch (9)
Sets the air temperature in the range of 18 to 32.0 °C (65 to
90 °F) in the MANUAL and AUTO modes. Temperature can
be set by 0.5 °C (0.9 °F) increments. The set-temperature is
displayed on the LCD (8) center.
 Increasing Temperature
Each time the top side mark " " on temperature control
switch (9) is pressed, the set-temperature is increased by
0.5 °C (0.9 °F) increments.
 Decreasing Temperature
Each time the bottom side mark " " on temperature
control switch (9) is pressed, the set-temperature is
decreased by 0.5 °C (0.9 °F) increments.
 Temperature Mode Change (Centigrade  Fahrenheit)
Press both " " and " " marks on the temperature
control switch for longer than 5 seconds at the same
time to change the temperature mode (Centigrade 
Fahrenheit). (Unit in temperature mode is abbreviated.)
Temperature Mode
Centigrade
Fahrenheit
OPERATOR'S STATION
Display on LCD
18.0 to 32.0
63 to 91
9
1-71
8
MNDB-01-011