Carrier ZC Series Owner's Manual page 8

These buttons set the time hour by hour, up to 12 hours.
NOTE
To cancel this function, press the Timer
button again, and set the time to zero.
To increase or reduce the temperature in the room,
press the buttons (+) or (-), as required.
NOTE
The temperature ranges from 18ºC / 65°F
to 32ºC / 90°F. To set the maximum or the
minimum, the unit beeps twice.
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To display the room temperature, press buttons (+)
and (-) simultaneously for 3 seconds.
To cool, press the Cooling mode button.
When this function is activated, the letter is displayed
on the panel.
To heat, press the Heating function button.
NOTE
Only for models with heat feature.
When this function is activated, the letter is displayed
on the panel.