Carrier 33CS250-01 Thermostat User Manual

Owner’s Manual
Part Number 33CS250-01
IMPORTANT: Read entire instructions before pro-
gramming the thermostat.
Carrier’s 7-day, commercial, programmable thermostats
are wall-mounted, low-voltage thermostats which maintain
room temperature by controlling the operation of an HVAC
(heating, cooling and ventilation) system. Separate heating
and cooling set points and auto-changeover capability allow
occupied and unoccupied programming schedules for en-
ergy savings.
All thermostats allow up to 3 occupied and one unoccu-
pied time/temperature setting to be programmed per
24-hour period. Each thermostat stores programs for 7 in-
dependent days. Batteries are not required. During power in-
terruption the internal NEVERLOST™ memory stores pro-
grams for an unlimited time.
IMPORTANT: The thermostat has a configurable se-
curity level. If certain functions are not available (chang-
ing set points, changing programming schedules), the
thermostat security level may be configured to ex-
clude those functions. Call the installer to reconfigure
the security level.
Thermostat Display
The thermostat display is lo-
cated in the center of the thermostat. See Fig. 1. The fol-
lowing information can be displayed on the screen:
fan setting (FAN ON or blank)
override indication
room temperature
desired temperature
service filter indicator
time of day
day of the week
schedule period (Occupied 1, 2, or 3; or Unoccupied)
setup indicator (programming mode)
lock indicator
start/stop indicator (schedule period program mode)
Heat or Cool Indicator A Heat or Cool indicator is
located on the bottom left cover of the thermostat. See
Fig. 2. The light will be red if the thermostat is in Heating
mode. The light will be green if the thermostat is in Cooling
Thermostat Front Panel Buttons The thermo-
stat has buttons on the front cover which are used to raise or
lower the desired set point and override the current program.
See Fig. 2.
ARROW buttons will raise or lower the current desired tem-
perature set point. If the thermostat is in AUTO mode, press-
ing the UP ARROW or DOWN ARROW buttons will adjust
both the heating heating and cooling set points. Pressing the
UP ARROW or DOWN ARROW buttons in Cooling mode
will adjust only the cooling set points. Pressing the UPAR-
ROW or DOWN ARROW buttons in Heating mode will ad-
just only the heating set points. The UPARROW and DOWN
ARROW buttons are also used in programming mode.
OVERRIDE BUTTON The Override button is used to
force the thermostat from Unoccupied mode into the Occu-
pied 1 mode comfort settings. The Override period will be
set at 30 minutes. The thermostat will then return to Unoc-
cupied mode. To increase the amount of time in Override
mode, press the Override button again. Thirty minutes of over-
ride time will be added for each time the Override button is
pressed up to a maximum of 4 hours. After the 4-hour limit
has been reached, press the Override button again to cancel
override mode.
While in Override mode, the Override icon and the Oc-
cupied 1 icon will be displayed on the thermostat. The time
of day and the minutes remaining in Override mode will al-
ternate on the thermostat display.
The set points are adjustable with the UP ARROW and
DOWN ARROW keys during Override mode.
Fig. 1 Thermostat Display
Programmable Thermostat
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 11a 13a
PC 111 Catalog No. 533-318 Printed in U.S.A. Form 33CS-4SO Pg 1 12-97 Replaces: New