Carrier 33CS User Manual
Commercial Thermostat
Owner’s Manual
Part Number 33CSPTN-02
33CS
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 thermos tats allow up to 4 time/temper ature settings t o
be programmed per 24-hr period. Each thermostat stores programs for 7 independent days. Batteries are not required. During power interruption the internal memory stores programs for
an unlimited time.
OPERATION
Thermostat Display —
located in the top center of the thermostat. See Fig. 1. The following information can be displayed on the screen:
• mode (OFF, EHEAT, COOL, AUTO, or HEAT)
• fan setting (ON or AUTO)
• hold status
• auxiliary heat status
• room temperature
• desired temperature
• clean filter status
• time of day
• day of the week
• schedule period (OC1, UN1, OC2, or UN2)
• outdoor temperature (optional)
• leaving air temperature (optional)
The thermostat display is
Thermostat Programming Buttons and Operation —
used to change the set points of the thermost at, set the modes,
and program schedules. The programming buttons are accessible from underneath the thermosta t cover. To access the programming buttons, pull on the hinged thermostat cover. See
Fig. 2. The programming buttons are: Copy Previous Day , Program, Mode, Change Day, End, Fan, Set Time/Temp, Occupied, and Hold.
desired temperature set point and to scroll through programming set points. The Up and Down buttons are accessible from
the outside of the thermostat.
the Hold button, pressing the Up and Down buttons to change
the temperature set point, or pressing the Occupied button.
PROGRAMMING BUTTON LOCKOUT — The thermostat has a lockout feature which will not acknowledge programming buttons until the lockout code is entered. A fter the
lockout code has been entered, the keypad will remain unlocked until the user has stopped pressing buttons for 2 minutes. The lockout feature is configured by the installer.
NOTE: The lockout code sequence is Mode, Copy Previous
Day, Set Time/Temp, and Hold.
The thermostat has programming buttons which are
The Up and Down buttons are used to change the current,
The daily schedule can be overridden in 3 ways: pressing
NOTE: During lockout, the Occupied button will not be
disabled.
HOLD BUTTON OPERATION — Pressing the Hold button
disables the time and temperature schedule and holds the current desired tempe rature set point. When a Hold is active, the
HOLD annunciator is displayed on the thermostat screen. To
release the Hold, press the Hold button a second time. The
Hold will rema in acti ve i nde fini tely.
FAN BUTTON OPERATION — The Fan button selects fan
operation. When the fan is set to ON, the fan will run continuously for improved air circulation. When the fan is set to
AUTO, the fan will run during heating and cooling operation
only. During setback mode (UN1, UN2), the fan will always
be in AUTO mode, unless programmed for continuous operation by the installer in set up.
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 wi ll only enter Heating mode (if the
room temperature is below the heating set poi nt). 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 w ill enter Heating or Cooling mode
based on the room temperature and the heating and cooling set
points. Units also have an EHEAT selection. If EHEAT is configured by installer, the unit will use the second stage of heating to provide heating if necessary. The annunciator for each
selection will be displayed on the thermostat when selected.
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 des ired temperat ure setting. Th e thermostat do es
not need to be manually changed from heat ing to cooling or
cooling to heating operation.
NOTE: It is recommended that auto-changeover mode not be
used if the outdoor temperature is consistently lower than 50 F
or greater than 80 F. In these cases, select heating or cooling
mode only.
SMART RECOVERY (HEATING MODE) — The smart
recovery function is designed to save energy by gradually
adjusting temperatures to meet scheduled set points. The thermostat has 2 schedule modes, normal occupied mode and setback mode (a time when the space is unoccupied). The Smart
Recovery function begins 1 to 1.5 hours before the scheduled
occupied mode and gradually adjusts room temperature so the
temperature is at the occupied mode se t point when the occupied time period begins. This is more efficient than making the
system run at full capacity until the desired temperature is met.
NOTE: Smart recovery does not apply to cooling operation.
Set Current Day —
the day shown on the thermostat display to the next day. If a
schedule has been entered, the thermostat will follow the
schedule of the new selected day.
The Change Day button will change
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Ta b 1 1 a 1 3 a
PC 111 Catalog No. 533-357 Printed in U.S.A. Form 33CS-14SO Pg 1 9-99 Replaces: 33CS-3SO
Set Current Time —
The Set Time/Temp button allows
the user to change the time displayed on the thermostat. Press
the Set Time/Temp button. The TIME annunciator will flash.
Press the Up and Down buttons until the correct time is shown.
Hold down the buttons to quickly move through the time display. The A M and PM annunciators will automatically change.
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 End button to exit the Set Time mode.
Reset Filter —
The Reset Filter function is initiated by
pressing the Hold and Occupied buttons simultaneously. The
Reset Filter function is used to clear the “Clean Filter” icon on
the display screen. The “Clean Filter” icon reminds the user
when it is time to change or clean the filter of the unit.
Unoccupied Override —
The Occupied button is only
active during unoccupied periods. The Occupied button is
inactive during occupied periods. If the thermostat is in unoccupied mode and the user presses the Occupied button, the set
points are changed to the OC1 set points for heating and cooling. The OC1 icon will flash to show the user that the thermostat is in override.
The thermostat will remain in override until the next scheduled time period or for the number of allowed override hours
programmed in the thermostat configuration (Option 18)
whichever comes first.
NOTE: If the set point is changed during unoccupied override,
the thermostat will change the unoccupied 1 (UN1) set point.
Programming Thermostat Schedules —
Before
programming the thermostat, plan the thermostat daily schedule. The schedule is divided into 7 days (Monday through Sunday). Each day has 4 time periods (OC1, UN1, OC2, UN2).
Each time period has a start time, heating set point, and cooling
set point. Fill in Table 1 below as an aid to programming the
daily schedules.
When choosing the times for OC1, UN1, OC2, and UN2,
the following rules must be followed:
• The maximum number of hours allowed from OC1 to
UN1, or from OC2 to UN2 is 12 hours. For example, if
OC1 has a value of 6:00 AM and UN1 had a value of
5:00 PM, this would be acceptable. If however, OC1 has
a value of 6:00 AM and UN1 has a value of 7:00 PM,
this would not be acceptable because the difference is
greater than 12 hours.
• The value of UN2 must be greater than or equal to the
value of OC2, while the value of OC2 must be greater
than or equal to the value of UN1, and the value of UN1
must be greater than or equal to OC1. For example,
acceptable values would be:
OC1 UN1 OC2 UN2
6:00 AM 5:00PM 5:00 PM 10:00 PM
In the example above, the thermostat will be occupied from
6:00 AM to 10:00 PM. However, if the following values
were entered, the thermostat would not be occupied as one
may expect:
OC1 UN1 OC2 UN2
6:00 AM 7:00 PM 6:00 PM 12:00 AM
In the new example, the thermostat will display UN2 from
12:00 AM to 6:00 AM, then OC1 from 6:00 AM to 6:00 PM,
then OC2 from 6:00 PM to 7:00 PM, then UN1 from 7:00 PM
to 12:00 AM. The thermostat, in this example, would be occupied from 6:00 AM to 7:00 PM because OC2 has a value less
than the va lue o f UN 1.
PROGRAMMING MODE — To program the daily schedules, perform the following procedure:
1. Enter programming mode by pressing the Program
button. The PROGRAMMING annunciator will
appear on the thermostat display. The current day of
the schedule will be displayed and the current programming time period of that day will be displayed.
The TIME annunciator will flash.
NOTE: If a programming button is not pushed for 2 minutes,
the thermostat will exit programming mode and any changes
made will be saved.
2. Press the Up and Down buttons to set the start time for
the schedule day and period shown.
3. Press the Set Time/Temp button once the correct time
is shown. The TIME annunciator will stop flashing
and the HEAT annunciator will flash.
4. The heating and cooling set points can now be programmed. The HEAT and COOL annunciators will
flash for the heating and cooling set points respectively. The Set Time/Temp button is used to toggle
between the time, heating, and cooling set points. Use
the Up and Down buttons to raise and lower the temperature set points.
NOTE: There must be at least 2 degrees difference betwe en
the cooling and heating set points. The thermostat will automatically change any set points closer than 2 degrees.
5. Press the Program button to advance to the ne xt time
period.
6. Perform Steps 2 through 5 until the times and temperature set points have been entered for the entire day.
Press the Change Day button to move to the schedule
for the next day.
7. Repeat Steps 2 through 6 to program the remaining
schedule days. The Copy Previous Day button can be
used to copy the previous day’s s chedule if the schedules are the same.
8. After all the times and set points for each day have
been entered, press the End button to finish entering
the schedule.
NOTE: The thermostat will continue to follow the schedule until a new one is entered. The schedule may need to
be updated for different seasons or prolonged changes in
temperature.
Table 1 — Daily Schedule Planner
DAY OF
THE WEEK
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
NOTE: The cooling temperature set point must be at least 2 degrees higher than the heating temperature set point.
OC1 UN1 OC2 UN2
Time / Heat / Cool Time / Heat / Cool Time / Heat / Cool Time / Heat / Cool
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SCHEDULE
2
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