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Lennox SignatureStat 81M26

Lennox SignatureStat 81M26
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Menu Driven Display
Fully Programmable
24 VAC with Worry-Free
Memory Storage
1 Heat / 1 Cool, 2 Heat / 2 Cool
and Heat Pump Models
Five Year Warranty
User's Manual
504, 684M
110-1052F
DELUXE
PROGRAMMABLE
THERMOSTATS
with Humidity Control
81M26
81M27
81M28
110-1052F 5/12/05 11:59 AM Page 1

Table of Contents

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Lennox SignatureStat 81M26 Specifications

General IconGeneral
CategoryThermostat
TypeSmart Thermostat
DisplayColor touchscreen
ConnectivityWi-Fi
Mobile AppLennox Mobile App
Voice ControlAmazon Alexa, Google Assistant
Model81M26
CompatibilityLennox HVAC systems
Control Featuresscheduling
Power SourceHardwired
Energy Saving FeaturesAdaptive recovery, usage reports

Summary

Basic Thermostat Operations and Adjustments

Changing Time and Day

Setting the current time and day of the week on the thermostat.

Activating Heating, Cooling, and Fan Modes

Guide on turning on heating, cooling, and fan operation modes.

Temporary Temperature Adjustments and Holds

How to temporarily change temperature and set holds for comfort.

Vacation Mode Configuration

Instructions for setting temperature during unoccupied periods to save energy.

Thermostat Programming and Scheduling

Programming Thermostat Schedules

Step-by-step guide for setting daily heating and cooling schedules with events.

Copying Program Schedules

How to copy one day's program to other days for efficiency.

Understanding Programming Events and Choice

Explanation of programming events and choosing the right program.

Humidity Control and Mode Settings

Humidity Control: Humidify, Dehumidify, and Modes

Setting humidity levels and understanding mode differences (Basic, Precision, Dew Point).

Humidifier Maintenance Reminder

Information on the humidifier maintenance reminder service interval.

User Settings and Personalization

Detailed User Settings Explanations

In-depth explanation of temperature units, clock, display, differential, and limit settings.

Security Settings and When to Adjust

Configuring security codes and guidance on adjusting user settings.

Installer Settings and System Configuration

Installer Settings Overview and Setup

Configuration for HVAC system type, heating, auxiliary heat, sensors, and EER.

Caution on Changing Installer Settings

Warning against unauthorized changes to installer settings to prevent damage.

Advanced Features and Status Indicators

Energy Efficient Recovery (EER) and Outdoor Sensor

How EER and the outdoor sensor enhance comfort and efficiency.

Display Lights Explained

Explanation of the meaning of the HEAT, COOL, AUX, CHECK, and EMER indicator lights.

Troubleshooting and Support Information

Power Outages and Resetting

Procedures for power outages and resetting the thermostat to factory defaults.

Identifying Status and Contacting Support

How to check system status and obtain further assistance.

Energy Cost Saving Tips

Reducing Energy Bills with ENERGYSTAR

Tips for lowering heating and cooling costs using recommended setpoints and features.

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