Lennox International Inc 81M26 Important Safety Information, Do not USE with Commercial Equipment

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IMPORTANT SAFETY INFORMATION

!WARNING:

•DO NOT USE WITH COMMERCIAL EQUIPMENT.

•Always turn off power at the main power source by unscrewing fuse or switching circuit breaker to the off position before installing, removing, or cleaning this thermostat.

•Read all of the information in this manual before programming this thermostat.

•This is a 24V AC low-voltage thermostat. Do not install on voltages higher than 30V AC.

•All wiring must conform to local and national building and electrical codes and ordinances.

•Do not short (jumper) across terminals on the gas valve or at the system control to test installation. This will damage the thermostat and void the warranty.

•Do not connect ground to any terminal in this unit.

•This thermostat is equipped with automatic compressor protection to prevent potential damage due to short cycling or extended power outages. The short cycle protection provides a 5-minute delay between heating or cooling cycles to prevent the compressor from being dam- aged.

•Do not switch system to cool if the temperature is below 45°F (7°C). This can damage the cool- ing system and may cause personal injury.

•Use this thermostat only as described in this manual.

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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