Carrier P274-0150 owner manual General, Operation, Owner’S, Residential, Manual, Thermostat

OWNER’S	Residential
MANUAL
	Thermostat

Part Number P274-0150

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.

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

•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.

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.

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.

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 — 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	LITERATURE NUMBER P274-6SO
© CARRIER CORPORATION 1106 6-01	REPLACES: NEW
PRINTED IN U.S.A.	CATALOG NUMBER 570-458