Carrier Thermostat P274 0150 User Manual

TOTA-

OWNER’S

MANUAL

LINE 1c.eps

Residential

Thermostat

gold-

1.pdf

Part Number P274-0150

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.

IMPORTANT: Read entire instructions before pro-

gramming the thermostat.

GENERAL

Totaline® thermostats are wall-mounted, low-voltage ther-

mostats which maintain room temperature by controlling the

operation of an HVAC (heating, ventilation and air condition-

ing) 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.

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.

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.

OPERATION

Thermostat Display — The thermostat display is locat-

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

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.

• desired temperature

• clean filter status

• outdoor temperature (optional)

Thermostat Buttons and Operation — The Up and

Down Arrows are used to change the current, desired tempera-

ture 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 tem-

perature set point is displayed. Press the Mode button to select

the second temperature setting (either HEAT 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 continu-

ously for improved air circulation. The FAN icon will be dis-

played on the LCD. When the fan is set to AUTO, the fan will

run during heating and cooling operation only and provides

energy savings.

Reset Filter — The CLEAN FILTER icon reminds the

user when it is time to change or clean the filter of the unit. The

Reset Filter function is initiated by Pressing the RESET

FILTER button after you have changed or cleaned your filter to

restart the timer. The Reset Filter function is used to clear the

CLEAN FILTER icon on the display screen.

Display Outdoor-Air Temperature — When the Up

and Down Arrows are pressed at the same time, the display

will show the temperature of the sensor wired to the thermo-

stat. The display then returns to normal. If a sensor is not con-

nected, then “--” is displayed.

The valid temperature range for the outdoor-air sensor is

–38 to 145 F.

POWER OUTAGE — An internal power source maintains the

desired temperature settings indefinitely.

System Error — The temperature sensor failure indicator

sends a -- reading to the LCD display. This indicates your ther-

mostat’s internal or outdoor temperature sensor is no longer

able to measure temperatures. An E2 reading on the LCD dis-

play means there is not enough voltage for the system to

operate.

Manufacturer reserves the right to

discontinue, or change at any time,

specifications or designs without notice

and without incurring obligations.

REPLACEMENT COMPONENTS DIVISION

PRINTED IN U.S.A.

LITERATURE NUMBER P274-6SO

REPLACES: NEW

CATALOG NUMBER 570-458

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RESIDENTIAL THERMOSTAT

LIMITED FIVE-YEAR WARRANTY

FIVE-YEAR WARRANTY — This CARRIER CORPORATION product is warranted to be free from defects in

material and workmanship under normal use and maintenance for a period of five years from the date of original

installation. A new or remanufactured part to replace the defective part will be provided without charge for the