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White Rodgers 1F90-51 manual If the outside temperature is below 50F, Operating Your Thermostat

Models: 1F90-51

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If the outside temperature is below 50°F,

use the button to move the tempera- ture below the setpoint temperature. See

OPERATING YOUR THERMOSTAT.

!CAUTION

If the outside temperature is below 50°F,

DO NOT use the button to move the temperature below the setpoint tempera- ture. Property damage may result due to compressor slugging.

9.Why doesn’t the temperature change at the time I programmed?

There may be a number of causes for this situation. The following are primary reasons.

•The EMR function is operating. The EMR function will bring on the system automati- cally to bring the temperature to the se- lected level by the beginning of the next

program period. See OPERATING YOUR THERMOSTAT.

•You have programmed the incorrect day or time. Check your programming (be sure that the times you programmed are correct AM or PM times). See PRO-

GRAMMING YOUR THERMOSTAT.

•The thermostat is in the HOLD mode. Press PRGMRUN to start program operation. See

OPERATING YOUR THERMOSTAT.

•The compressor lockout feature is oper- ating; wait about 5 minutes for system to begin running. See OPERATING YOUR THERMOSTAT.

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White Rodgers 1F90-51 manual If the outside temperature is below 50F, Operating Your Thermostat, Gramming Your Thermostat

Contents

1F90-51 Operator Save this booklet for future useOPERATION GUIDE WHITE-RODGERSAbout Your New Thermostat In This Guide QUESTIONS AND ANSWERSYOUR NEW THERMOSTAT’S PROGRAMMING YOURYOUR NEW THERMOSTAT’S FEATURES OPERATING YOUR THERMOSTAT to turn the thermostat OFF PARTS OF THE THERMOSTATThe Back of The Thermostat Body Other than and , the buttons are located behind the thermostat door. To open the door, put your fingernail in the indentation at the top of the door, then pull the door out from the top and swing it down on its hinges The Display WHITE-RODGERS SYSTEMDIGITAL COMFORT SET The Thermostat Buttons 18 The red indicator light glows whenever heat Lowers temperature set17 Blue arrow ting 40F or 4C minimumTWO HOUR TEMPERATURE OVER OPERATING FEATURESF/C CONVERTIBILITY - Press TIMEFWD and “ADVANCE PROGRAM” KEY - PressTo adjust heat anticipation, press CLOCKSET and a Return of power after a power outage PLANNING FOR YOUR NEEDS PROGRAMMING YOUR THERMOSTATIN YOUR HOME 4a. What time does the building become va- cant?running the factory preset program Heating/Cooling Schedule Plan SAMPLE Heating/Cooling Schedule Plan TO TURN THERMOSTAT OFF ENTERING YOUR PROGRAMBEFORE REATTACHING THERMOSTAT TO SUBBASE Set Current Time and DayEnter Heating Program program, press TIMEFWD or BACKTIME until your se Enter Cooling Program CHECK YOUR PROGRAMMINGoperation. USE TO TURN THERsystem. Then press PROGRAMMING YOUR THERMOSTAT QUESTIONS AND ANSWERSprogram. See PROGRAMMING YOUR THERMOSTAT ERATING YOUR THERMOSTAT GRAMMING YOUR THERMOSTATOPERATING YOUR THERMOSTAT the thermostat immediately, pressOPERATING YOUR THERMOSTAT If the outside temperature is below 50FGRAMMING YOUR THERMOSTAT OPERATING YOUR THERMOSTATsimply press ATING YOUR THERMOSTATGRAMMING YOUR THERMOSTAT ERATING YOUR THERMOSTATMING YOUR THERMOSTAT White-RodgersDivision, Emerson Electric Co Attn Technical Service Department9797 Reavis Road St. Louis, MO Part No. 37-5099B