Carrier 53DFS250-HW Operating Manual page 21

Advanced functions
Program schedule on/off
Function
Press s/t to turn the program schedule on or off:
0160
Options: 0 Program schedule is off. Thermostat is non-programmable.
4 Program schedule is on (7-day programmable).
Temperature format (°F/°C)
Function
Press s/t to set the temperature display format:
0320
Options: 0 Fahrenheit
1 Celsius
Daylight savings time on/off
Function The thermostat is pre-programmed to automatically adjust to daylight savings time.
0330
Press s/t to select an option:
Options: 0 Off: No adjustment for daylight savings time
1 On: Auto-change to daylight savings time
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53DFS250-HW Thermostat
69-2566EFS—05