OWNER'S
MANUAL
Commercial
Thermostat
Part Number P274-21 00
GENERAL
The Totaline@ 7-day, commercial, programmable thenno-
stats are wall-mounted, low-voltage thennostats which main-
tain room temperature by controlling the operation of an
HVAC (heating, ventilation and air conditioning) system. Sep-
arate heating and cooling set points and auto-changeover capa-
bility allow occupied and unoccupied programming schedules
for energy savings.
All thennostats allow up to 4 timeltemperature settings to
be programmed per 24-hr period. Each thennostat stores pro-
grams for 7 independent days. Batteries are not required. Dur-
ing power intemlption the internal memory stores programs for
an unlimited time.
lockout code has been entered, the keypad will remain
unlocked 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 TIlDe!Temp, and Hold
NOTE: During lockout, the Occupied button will not be
disabled
HOLD BUTTON oPERAnoN -Pressing the Hold button
disables the time and temperarure 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 oPERAnoN -The Fan button selects fan
operation. When the fan is set to ON, the fan will ron 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 (UNl, UN2), the fan will always
be in AUTO mode, unless programmed for continuous opera-
tion by the installer in set up.
MODE BUTTON oPERAnoN- 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 temperarure is consistently lower than 50 F
or greater than 80 F. In these cases, select heating or cooling
mode only.
SMART RECOVERY (HEAnNG 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 tempera-
ture so the temperature is at the occupied mode set point when
the occupied time period begins. This is more efficient than
OPERATION
Thermostat Display -The thennostat display is locat-
ed in the top center of the thennostat See Fig. 1. The following
infomlation 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 (OCl, UNl, OC2, or UN2)
.outdoor temperature (optional)
.leaving air temperature (optional)
Thermostat Programming Buttons and
Operation -The thennostat has programming buttons
which are used to change the set points of the thennostat, set
the modes, and set program schedules. The programming but-
tons are accessible from underneath the thennostat cover. To
access the programming buttons, pull on the hinged thennostat
cover. See Fig. 2. The programming buttons are: Copy Previ-
ous Day, Program, Mode, Change Day, End, Fan, Set TIme/
Temp, Occupied, and Hold
The Up and Down buttons are used to change the cmrent,
desired temperature set point and to scroll through program-
ming set points. The Up and Down buttons are accessible from
the outside of the thennostat.
The daily schedule can be ovenidden in 3 ways: pressing
the Hold button, pressing the Up and Down buttons to change
the temperature set point, or pressing the Occupied button.
PROGRAMMING BU1TON LOCKOUT -The thenno-
stat has a lockout feature which will not acknowledge pro-
gramming buttons until the lockout code is entered After the
Manufacturer reserves the right to
discontinue, or change at any time,
specifications or designs without notice
and without incurring obligations.
REPLACEMENT COMPONENTS DIVISION
@CARRIER CORPORATION 11-99
PRINTED IN U.S.A.
LITERATURE NUMBER P274-1S0
REPLACES: 997-550011-22
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