Carrier 33CS Thermostat User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 533-357 Printed in U.S.A. Form 33CS-14SO Pg 1 9-99 Replaces: 33CS-3SO
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Owner’s Manual
Part Number 33CSPTN-02
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 4 time/temperature settings to
be programmed per 24-hr period. Each thermostat stores pro-
grams for 7 independent days. Batteries are not required. Dur-
ing power interruption the internal memory stores programs for
an unlimited time.
Thermostat Display —
The thermostat display is
located in the top center of the thermostat. See Fig. 1. The fol-
lowing information can be displayed on the screen:
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)
Thermostat Programming Buttons and Opera-
tion —
The thermostat has programming buttons which are
used to change the set points of the thermostat, set the modes,
and program schedules. The programming buttons are accessi-
ble from underneath the thermostat cover. To access the pro-
gramming buttons, pull on the hinged thermostat cover. See
Fig. 2. The programming buttons are: Copy Previous Day, Pro-
gram, Mode, Change Day, End, Fan, Set Time/Temp, Occu-
pied, and Hold.
The Up and Down buttons are used to change the current,
desired temperature set point and to scroll through program-
ming set points. The Up and Down buttons are accessible from
the outside of the thermostat.
The daily schedule can be overridden in 3 ways: pressing
the Hold button, pressing the Up and Down buttons to change
the temperature set point, or pressing the Occupied button.
stat has a lockout feature which will not acknowledge pro-
gramming buttons until the lockout code is entered. After the
lockout code has been entered, the keypad will remain un-
locked until the user has stopped pressing buttons for 2 min-
utes. The lockout feature is configured by the installer.
NOTE: The lockout code sequence is Mode, Copy Previous
Day, Set Time/Temp, and Hold.
NOTE: During lockout, the Occupied button will not be
HOLD BUTTON OPERATION — Pressing the Hold button
disables the time and temperature schedule and holds the cur-
rent desired temperature 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 remain active indefinitely.
FAN BUTTON OPERATION — The Fan button selects fan
operation. When the fan is set to ON, the fan will run continu-
ously 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 opera-
tion 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 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. Units also have an EHEAT selection. If EHEAT is con-
figured by installer, the unit will use the second stage of heat-
ing 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 desired temperature setting. The thermostat does
not need to be manually changed from heating 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.
recovery function is designed to save energy by gradually
adjusting temperatures to meet scheduled set points. The ther-
mostat has 2 schedule modes, normal occupied mode and set-
back 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 set point when the occu-
pied 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 Change Day button will change
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.
IMPORTANT: Read entire instructions before program-
ming the thermostat.
Commercial Thermostat