Carrier P274-0200-C User Manual
TOTALINi;
Part Numbers P274-0100-C, P274-0200-C, P274-0300-C
OWNER’S
MANUAL
Residential
Non-Programmable
Thermostat
IMPORTANT: Read entire instiuctions before program
ming the tliermostat.
GENERAL
Totaline® thermostats are wall-mounted, low-voltage tliermostats which maint;rin room temperature by controlling the
operation of an HVAC (heating, ventilation and air condition
ing) system, Sepru'ate heating and cooling set points and
auto-changeover capability allow occupied and unoccupied
programming for energy savings.
During power internjption tlie internal memoiy stores tem
perature and mode settings for an unlimited time. Batteries are
not required.
OPERATION
Thermostat Display — Tlie thermostat display is locat
ed in the top center of the thermostat. See Fig. 1. Tlie following
information can be displayed on the screen:
mode (OFF, FIEAT, COOL, EFIEAT, or AUTO)
fan setting (ON or AUTO)
auxiliary heat status (P274-0200-C, -0.Ì00-C only)
room temperature
desired temperature
reset filter
outdoor temperature (P274-0200-C, -0.700-C only)
Thermostat Buttons — The thermostat has buttons
which are used to change the set points of the thennostat and
set the thermostat modes. The buttons are accessible from
behind the thermostat cover. To access the buttons, pull on the
hinged tliermostat cover. The buttons ai'e: MODE, FAN. and
RESET FILTER. See Fig. 1,
Tlie UP and DOWN buttons are used to change tlie cuirent,
desired temperature set point and to scroll through program
ming set points. The UP and DOWN buttons are located on the
front of the thermostat.
Setting Indoor Temperature Set Points
1. Press the UP or DOWN button one time. The LCD
(liquid crystal display) will illuminate and the current
temperature set point will be displayed. Next to the
temperature display, FIEAT or COOL will be dis
played. SET TEMP will appear above the temperature
display.
2. To change the temperature set point, continue to press
the UP or DOWN buttons until desired temperature is
reached. Press the MODE button to set temperature for
another setting (Ffeat or Cool).
.7. The thermostat will automatically return to regular
operation within 5 seconds.
NOTE: The cool setting must be at least 2 degrees higher than
tlie heat setting for proper operation.
Fan Operation — Tlie fan button selects fan operation.
Tlie fan can operate in either Fan ON or AUTO mode.
Press the FAN button to switch between fan ON or AUTO
mode. When the fan is set to ON, “FAN” is displayed in the
LCD on the thermostat. The fan will nm continuously for im
proved air circulation while in the ON position.
When the fan is set to AUTO mode, the fan nms only as
needed to maintain indoor £iir temperature.
NOTE: The “FAN” indicator will not be displayed in the LCD
when thermostat is operating in AUTO mode.
Mode Operation — The Mode button selects the operat
ing mode of the tliermostat. Pressing tlie MODE button will
rotate the following options on the LCD: OFF, FfEAT, COOL,
AUTO, and EFFEAT (heat pump models only). The mode
for each selection will be displayed on the tliermostat when
selected.
NOTE: If AUTO is selected, the thennostat will enter Pleating
or Cooling mode based on the room temperature and the heat
ing and cooling set points.
Display Outdoor Temperature — To display the
outdoor-£tir temperature on thermostats offering this feature,
simultaneously press the UP and DOWN buttons for twenty
seconds. Tlie outdoor temperature will then be displayed on the
LCD.
NOTE: Two dashes ” appearing on tlie LCD indicates that
tlie thermostat either does not have this feature installed or the
temperature sensor is not properly connected.
Reset Filter Display — Tlie thermostat win display
“FILTER” on the LCE) when it is time to change or clean the
filter
After cleaning or changing the filter, press the RESET
FILTER button to restart the timer and turn off the indicator.
Auto Changeover Operation — The themiostat win
provide automatic changeover from Heating to Cooling mode
and Cooling to Heating mode when required. The tliermostat
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.
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 2004 9-04
PRINTED IN U.S.A.
LITERATURE NUMBER P274-7SO
REPLACES: 997-510011-19
CATALOG NO. 570-352
Battery Changeout — if tlie installation requires the
usage of batteries, the batteries will require replacement eveiy
12 months.
Open thermostat door and slide the batteiy compartment
door to the right. Remove two AA alkaline batteries. Instiill
two new AA alkiiline batteries following the polarity markings
(+ / -) on the thermostat.
Table 1 — Error Codes
SYMPTOM WHAT TO CHECK
Blank LCD Check tor 24 vac between R and C at terminal connections or battery.
{2 dashes) on temperature display
"E2" on temperature display
"E3" on temperature display The outdoor temperature sensor is open, not connected, or shorted.
"SERVICE FILTER" on temperature display
Cooling will not come on
Heating will not come on
Temperature sensor reading out of range. Check sensor for damage. If recycling power
does not clear display, thermostat should be replaced.
Brownout condition or too low of voltage to thermostat. Double check wiring and check for
24 vac between R and C. E2 will clear 15 sec after proper voltage is restored.
After the selected number of hour of blower operation "FILTER" will display on LCD. This is
to remind the home owner to "check" the filter. Press RESET FILTER button to clear display
and reset timer to 0.
Select COOL mode. Set desired temperature to 10° F below room temperature. Simulta
neously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check tor
COOL ON icon and 24 vac at Y (first-stage) terminal. If present, thermostat is okay and
problem is with equipment or wiring. If not present, replace thermostat.
Select HEAT mode. Set desired temperature to 10° F above room temperature. Simulta
neously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check for
HEAT ON and 24 vac at Y (first-stage) terminal (with heat pump) or W/W1 (with air condi
tioner) terminal. If present, thermostat is okay and problem is with equipment or wiring. If
not present, replace thermostat.
NOTE: If installation is hard-wired, batteries are not
required and will not need to be replaced.
Error Codes — if the thermostat displays “E2”,
“E3”, or “E4” in the LCD, an error is present. See Table I for
error codes and descriptions.
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