Carrier DEBONAIR 33CS - Manual (Page 4)

OPERATION
The Mode button selects the operating mode of the ther-
mostat. If OFF is selected, the thermostat will not enter Heat-
ing or Cooling mode. If HEAT is selected, the thermostat
will only enter Heating mode (if the room temperature is
below the heating set point). If COOL is selected, the ther-
mostat will only enter Cooling mode (if the room tempera-
ture is above the cooling set point). If AUTO is selected, the
thermostat will enter Heating or Cooling mode based on the
room temperature and the heating and cooling set points. If
PROGRAM ON is selected, the stored schedule is enabled
and the thermostat will follow the Occupied and Unoccu-
pied schedules stored in its memory.
Auto-Changeover — When the thermostat mode is set
to AUTO, the thermostat will provide automatic changeover
from Heating to Cooling mode and Cooling to Heating mode
when required. The thermostat will automatically switch to
maintain the desired temperature setting. The thermostat does
not need to be manually changed from heating to cooling or
cooling to heating operation.
Two-Stage Operation — The second stage of heat or
cool is turned on when the first stage has been on for a mini-
mum of 2 minutes and the temperature differential from the
set point is equal to or greater than the set point plus the
deadband plus 2 degrees.
Clock Backup — In the event of a power loss, the ther-
mostat will keep time for a minimum of 48 hours without
external power or batteries.
Fan Operation — If Fan On is selected, the fan will
run continuously during occupied schedule (except when Mode
is switched to OFF). The fan will be off during unoccupied
schedule except during heating or cooling operation.
If Fan On is not selected, the fan will only operate during
heating or cooling operation.
Emergency Heat — Emergency heat is available only
for heat pump applications. To turn on emergency heat, press
and hold the Override button. While holding the Override
button, press the UP button. An ‘‘EH’’ will be displayed. Dur-
ing emergency heat, the fan will operate and the second stage
of heat will be energized (locking out the first stage com-
pressor). To exit emergency heat, press and hold the Over-
ride button. While holding the Override button, press the UP
button. During emergency heat, only OFF and HEAT modes
are available.
Electric Heat — When the Electric Heat option in the
advanced setup is set to ON (configured by installer), the
thermostat will turn on the fan immediately any time there
is a heat demand. This feature should only be used on elec-
tric heating applications. Do not use with gas heat.
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