Carrier 33CS250-01 User Manual

Owner’s Manual

Part Number 33CS250-01

IMPORTANT: Read entire instructions before pro­gramming the thermostat.

GENERAL

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 en­ergy savings.

All thermostats allow up to 3 occupied and one unoccu­pied time/temperature setting to be programmed per
24-hour period. Each thermostat stores programs for 7 in­dependent days. Batteries are not required. During power in­terruption the internal NEVERLOST™ memory stores pro­grams for an unlimited time.

IMPORTANT: The thermostat has a configurable se­curity level. If certain functions are not available (chang­ing set points, changing programming schedules), the
thermostat security level may be configured to ex­clude those functions. Call the installer to reconfigure
the security level.

CONFIGURATION

Thermostat Display —

cated in the center of the thermostat. See Fig. 1. The fol­lowing information can be displayed on the screen:

• mode (OFF, HEAT, COOL, AUTO, or PROGRAM ON)

• 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
mode.

The thermostat display is lo-

33CS

Commercial

Programmable Thermostat

Fig. 1 — Thermostat Display

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.

SET POINT BUTTONS — The UP ARROW and DOWN
ARROW buttons will raise or lower the current desired tem­perature set point. If the thermostat is inAUTOmode, press­ing the UPARROW 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 UPAR­ROW or DOWN ARROW buttons in Heating mode will ad­just only the heating set points. The UP ARROWand 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 Occu­pied 1 mode comfort settings. The Override period will be
set at 30 minutes. The thermostat will then return to Unoc­cupied mode. To increase the amount of time in Override
mode, press the Override button again. Thirty minutes of over­ride 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 Oc­cupied 1 icon will be displayed on the thermostat. The time
of day and the minutes remaining in Override mode will al­ternate on the thermostat display.

The set points are adjustable with the UP ARROW and
DOWN ARROW keys during Override mode.

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

NOTE: If the thermostat is in Occupied mode and the Over­ride button is pressed, the thermostat will go into Unoccu­pied mode immediately. The thermostat will remain in Un­occupied mode until the next Occupied start time.

Thermostat Programming Buttons — The ther-

mostat has programming buttons which are used to change
the set points of the thermostat, set the modes, and program
schedules. The programming buttons are accessible from un­derneath the thermostat cover. To access the programming
buttons, pull on the hinged thermostat cover.See Fig. 3. The
programming buttons are: Mode, Fan, Holiday ,Program, and
Set Clock.

Fig. 2 — Thermostat Front Panel Buttons

Fig. 3 — Thermostat Programming Buttons

When the fan is not set to FAN ON (no icon displayed on
thermostat screen), the fan will run during heating and cool­ing operation only.

MODE BUTTON OPERATION — The Mode button se­lects the operating mode of the thermostat. If OFF is se­lected, the thermostat will not enter Heating 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 thermostat will only enter Cooling
mode (if the room temperature 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 Unoccupied 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.

HOLIDAY MODE — The Holiday button places the ther­mostat into Holiday mode. During Holiday mode, the un­occupied set points are enforced. The number of days the
thermostat will be in Holiday mode can be set.

Set Clock — The Set Clock button allows the user to

change the time and day displayed on the thermostat. Press
the Set Clock button to enter Set Timemode. See Fig. 4. The
current time will blink on and off. Press the UP ARROW
and DOWNARROWbuttonsuntil the correct time is shown.
Hold down the buttons to quickly move through the time
display. The AM and PM annunciators will automatically
change. To scroll through by hours only, press and hold down
the fan button while pressing the UP ARROW or DOWN
ARROW buttons. To ensure the schedules are properly fol­lowed, make sure that AM or PM is correct for the time cho­sen. When the correct time is shown, press the Mode button
to modify the day of the week. The current day will blink on
and off. Press the UP ARROW and DOWN ARROW but­tons until the correct day is shown. Press the Set Clock but­ton again to exit the Set Time mode.

The UP ARROW and DOWN ARROW buttons are used
to scroll through programming set points. The buttons are
also used to answer yes or no.

KEYPAD LOCK — The thermostat has a keypad lockout
feature which will not acknowledge front panel buttons until
the lockout sequence is entered. To disable or lock the key­pad, press and hold the Override button. While holding down
the Override button, press the UP and DOWN ARROW but­tons simultaneously. The ‘‘Locked’’’ icon will appear on the
display.

The thermostat is unlocked by performing the same pro­cedure. Press and hold the Override button. While holding
down the Override button, press the Up and Down Arrow
buttons simultaneously. The ‘‘Locked’’ icon will be re­moved from the display.

FAN BUTTON OPERATION — The Fan button selects fan
operation. When the fan is set to FAN ON, the fan will run
continuously for improved air circulation.

NOTE: When the thermostat is in Unoccupied mode, the fan
will run only during heating or cooling operation, even if the
fan is set to FAN ON, this is the energy-saving smart fan
feature.

Fig. 4 — Setting the Clock

Programming Thermostat Schedules — Be-

fore programming the thermostat, plan the thermostat daily
schedule.Theschedule is divided into 7 days (Monday through
Sunday). Each day can have 2 (Occupied 1, Unoccupied), 3
(Occupied 1, Occupied 2, Unoccupied), or 4 (Occupied 1,
Occupied 2, Occupied 3, Unoccupied) time periods. Each
occupied time period has a start time, stop time, heating set
point, and cooling set point. The unoccupied time period has
a heating set point and a cooling set point. The unoccupied
time period is active whenever an occupied time period is
not active. Fill in Table 1 on page 5 as an aid to program­ming the daily schedules.

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PROGRAMMING MODE — To program the daily sched­ules, perform the following procedure:

1. Enter programming mode by pressing the Program but­ton. The Occupied 1 annunciator will appear on the ther­mostat display. See Fig. 5. Use the UP ARROW and
DOWN ARROW buttons to set the maximum number
of Occupied periods available. The thermostat can be
set to 1, 2, or 3. After the number of Occupied periods
has been selected, press the Mode button.

2. The cooling set point for Occupied 1 will be displayed.
Use the UP ARROW and DOWN ARROW buttons to
raise or lower the cooling set point until the desired tem­perature is shown. The range of acceptable values is 35
to 99 F (1 to 37 C). Press the Mode button to continue.
See Fig. 5.

3. The heating set point for Occupied 1 will be displayed.
Use the UP ARROW and DOWN ARROW buttons to
raise or lower the heating set point until the desired tem­perature is shown. The range of acceptable values is 35
to 99 F (1 to 37 C). Press the Mode button to continue.
See Fig. 5.

Fig. 5 — Setting Occupied 1 Set Points

4. The cooling set point for Unoccupied will be displayed.
Use the UP ARROW and DOWN ARROW buttons to
raise or lower the cooling set point until the desired tem­perature is shown. The range of acceptable values is 35
to 99 F (1 to 37 C) or ‘‘OF’’(no unoccupied cooling).
Press the Mode button to continue.

5. The heating set point for Unoccupied will be displayed.
Use the UP ARROW and DOWN ARROW buttons to
raise or lower the heating set point until the desired tem­perature is shown. The range of acceptable values is 35
to 99 F (1 to 37 C) or ‘‘OF’’ (no unoccupied heating).
Press the Mode button to continue.

6. The day of the week will be shown. Use the UP AR­ROW and DOWN ARROW buttons to change the day
of the week until the desired starting day is shown. Pos­sible choices are M (Monday) through S (Sunday). Press
the Mode button when the desired day is shown.

7. The Start Time for Occupied 1 will be displayed. Use
the UP ARROW and DOWN ARROW buttons to raise
or lower the time until the desired Start Time is shown.
Press the Mode button to continue. See Fig. 6.

8. The Stop Time for Occupied 1 will be displayed. Use
the UP ARROW and DOWN ARROW buttons to raise
or lower the time until the desired Stop Time is shown.
Press the Mode button.

9. The On/Off icon will be displayed. Use the UP AR­ROW to turn the Occupied 1 period ON for this day.
Use the DOWN ARROW to turn the Occupied 1 period
OFF for this day.

10. Repeat Steps 2 through 9 to program the remaining sched­ule for occupied periods 2 and 3 (if selected in Step 1).

Fig. 6 — Start Time Display

11. The Copy command can be used to copy the previous
day’s schedule if the schedules are the same. The copy
command becomes available after all the occupied pe­riods are programmed in a day. Use the UP ARROW to
change the copy command to YES. Use the DOWNAR­ROW to change the copy command to NO. Press the
Mode button when the choice has been made. See
Fig. 7.

If NO was selected, the schedule will automatically change
to the next day and the user must enter the occupied and
unoccupied schedules for that day.

NOTE: Occupied 1 schedule heating andcoolingsetpoints
are the same for each day. Occupied 2 and 3 set points
may be set to different values for each day of the week.

If YES was selected, the schedule will be copied to the
next day. The schedule copy may be repeated until Sun­day is reached. The Sunday schedule cannot be copied
to Monday.

12. After all the times and set points for each day have been
entered, press the Program button to finish entering the
schedule.

NOTE: The thermostat will continue to follow the schedule
until a new one is entered.

• If only one occupied schedule is selected, the Occupied 2

and 3 schedules are skipped.

• If the start time is set later in the day than the stop time,

the program will run from midnight of that day to the stop
time and then from the start time to midnight.

• If the same start and stop times are programmed for an

occupancy schedule, the thermostat will be in Occupied
mode for 24 hours.

• If one occupied period starts or stops within another oc-

cupied period, the lower numbered schedule has priority.
For example, if schedule Occupied 3 is running for 24 hours
and occupied schedule 2 comes on from 1 to 3 PM, the set
points from Occupied 2 are in effect from 1 to 3 PM.

OVERRIDING THE SCHEDULE — The schedule can be
overridden during operation by pressing the UP or DOWN
ARROW buttons to change the desired temperature. The ther­mostat will use the new set point until the next scheduled
time period starts.

Fig. 7 — Copy Command Display

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