Carrier P274-0150 User Manual
OWNER’S
MANUAL
Part Number P274-0150
IMPORTANT: Read entire instructions before programming the thermostat.
GENERAL
Totaline® thermostats are wall-mounted, low-voltage thermostats which maintain room temperature by controlling the
operation of an HVAC (heating, ventilation and air conditioning) system using separate heating and cooling set points and
auto-changeover capability.
Batteries are not required. During power interruption the
internal memory stores set points indefinitely.
OPERATION
Thermostat Display —
ed in the top center of the thermostat. See Fig. 1. The following
information can be displayed on the screen:
• mode (OFF, COOL, AUTO, or HEAT)
• fan setting (ON or AUTO)
• room temperature
• desired temperature
• clean filter status
• outdoor temperature (optional)
Thermostat Buttons and Operation —
Down Arrows are used to change the current, desired temperature set point. The Up and Down Arrows are accessible from
the outside of the thermostat. Press the up or down arrow. The
LCD readout will be illuminated and the heating or cooling
temperature set point will be displayed, but will not change.
HEAT, or COOL next to the temperature display indicates
which temperature set point is being displayed. Continue to
press up or down arrows until desired heating or cooling temperature set point is displayed. Press the Mode button to select
the second temperature setting (either HEA T or COOL).
NOTE: Your COOL setting must be at least 2 degrees higher
than the HEAT setting. The thermostat will automatically
change the previously set temperature to maintain that
2-degree difference.
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. The FAN icon will be displayed on the LCD. When the fan is set to AUTO, the fan will
run during heating and cooling operation only and provides
energy savings.
The thermostat display is locat-
The Up and
Residential
Thermostat
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.
Auto-Changeover —
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.
When the auto-changeover mode is selected, a change from
heat to cool (or vice versa) will not occur until an opposite
mode demand has existed for 20 minutes. If the set point is
changed, the 20-minute requirement is ignored.
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.
Reset Filter —
user when it is time to change or clean the filter of the unit. The
Reset Filter function is initiated by Pressing the RESET
FIL TER button after you have changed or cleaned your filter to
restart the ti mer. The Reset Filter f unction is used to c lear the
CLEAN FIL TER icon on the display screen.
The CLEAN FILTER icon reminds the
Display Outdoor-Air Temperature —
and Down Arrows are pressed at the same time, the display
will show the temperature of the sensor wired to the thermostat. The display then returns to normal. If a sensor is not connected, then “--” is displayed.
The valid temperature range for the outdoor-air sensor is
–38 to 145 F .
POWER OUTAGE — An internal po we r s o ur ce m a in t a in s th e
desired temperature settings indefinitely.
System Error —
sends a -- reading to the LCD display . This indicates your th ermostat’s internal or outdoor temperature sensor is no longer
able to measure temperatures. An E2 reading on the LCD display means there is not enough voltage for the system to
operate.
When the thermostat mode is set
When the Up
The temperature sensor failure indicator
Manufacturer reserves the right to
discontinue, or change at any time,
specifications or designs without notice
and without incurring obligations.
REPLACEMENT COMPONENTS DIVISION LITERATURE NUMBER P274-6SO
© CARRIER CORPORATION 6-01 REPLACES: NEW
PRINTED IN U.S.A. CATALOG NUMBER 570-458
*OUTDOOR TEMPERATURE
DISPLAY SHOWS THE
OUTDOOR TEMPERATURE
FAN BUTTON CHOOSES
BETWEEN ON OR AUTO
FAN OPERATION.
MODE
OFF
COOL
HEAT
AUTO
FAN
AUTO
ON
CLEAN FILTER
CLEAN FILTER INDICATOR LETS YOU
KNOW IT IS TIME TO CLEAN OR REPLACE
YOUR SYSTEM’S AIR FILTER
RESET FILTER BUTTON
RESTARTS THE TIMER THAT
DETERMINES THE NEXT AIR
FILTER CHANGE OR
CLEANING
MODE BUTTON SELECTS
BETWEEN OFF, HEAT,
COOL, AND AUTO
OPERATION.
Thermostat
RESET FILTER
FAN MODE
NOTE: Not all messages displayed in the above illustration will appear at once in any situation.
Fig. 1 — Thermostat Display and Buttons
ROOM TEMPERATURE
DISPLAY SHOWS THE CURRENT
ROOM TEMPERATURE ON THE
LCD READOUT.
UP AND DOWN ARROWS
INCREASE OR DECREASE THE
DESIRED TEMPERATURE
SETTING.
*AVAILABLE AS AN ACCESSORY.
2
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