81M26 81M27 81M28 | Lennox International Inc instruction

110-1052F 5/12/05 11:59 AM Page 1

81M26

81M27

81M28

DELUXE

PROGRAMMABLE

THERMOSTATS

with Humidity Control

User's Manual

Menu Driven Display

Fully Programmable

24 VAC with Worry-Free Memory Storage

1 Heat / 1 Cool, 2 Heat / 2 Cool and Heat Pump Models

110-1052F
504, 684M	Five Year Warranty

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Lennox International Inc user manual 81M26 81M27 81M28

Contents

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