Lennox International Inc 81M26, 81M28, 81M27 user manual What should I do if my power goes out?

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110-1052F 5/12/05 11:59 AM Page 26

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What should I do if my power goes out?

Make sure your family is safe and don’t worry about the thermostat. Your thermostat automatically retains the time of day for approxi- mately two hours in the event of a power outage. All other programmed parameters are stored permanently in memory. So, if your power is out for more than two hours, simply reset the clock. See page 4.

How do I reset the thermostat program to factory conditions?

To reset the thermostat to factory conditions, press the UP button and the LEFT button at the same time. Hold for 8 seconds. The time of day will display 12:00 indicating a reset has occurred.

NOTE: This will erase all programming and return the thermostat to the factory conditions (including the installer settings) along with erasing current security codes. Use this only as a last resort.

How do I know if the heating or cooling is on?

The display of the thermostat will indicate the operating mode, HEAT or COOL. When the temperature in your home decreases or increases, the heating or cooling cycle will come on based on the displayed mode. Also, lights along the bottom crease of the thermo- stat will indicate various equipment operations.

Who do I contact for more information?

Simply call 1-800-9LENNOX or visit us on the web at www.lennox.com.

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Contents 81M26 81M27 81M28 Important Safety Information Do not USE with Commercial EquipmentTable of Contents How do I change the time of day and day of the week? MenuHow do I turn on the heating or cooling cycles? How do I cycle the fan? How does Intermittent FAN work?How do I temporarily change the temperature? SET Temperature ATCan I set a temporary adjustment for longer than 3 hours? 70 ˚How do I return to the Program Mode after being in HOLD? 70 ˚70˚ How do I set the Vacation Mode?How do I program my thermostat? Day to be set the same. MON-FRI allows for weekdaySET Cool How do I copy one day’s program to another day? Monday ProgramWhat is an event? How do I know what program is right for me?What is the difference between Basic and Precision modes? How do I set the Dehumidify Levels?Can I change the Humidifier Maintenance Service Intervals? What happens if the mode is set to OFF?What is the Dew Point Adjustment Function? What are the User settings? Or CNumber of Events PER DAY Clock SettingsSetpoint Temperature More Detailed Information on the User Settings Differential SettingsSecurity Code When would I need to change the User settings?Security Settings What are the Installer settings? System SetupResidual Cool Installer settingsAuxiliary Heat Balance PointsHumiditrol Energy Efficient RecoveryDeadband Setpoint Temperature Offset When would I need to change the Installer settings?Service Monitor Menu Contact InformationHow does my remote outdoor sensor work? How does Energy Efficient Recovery EER work?Where should I install a remote outdoor sensor? What do the lights below the display mean?Who do I contact for more information? What should I do if my power goes out?How do I know if the heating or cooling is on? My energy bills are too high. Is there anything I can do? 504, 684M