LENNOX S40 Smart Thermostat User Guide

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Dallas Home  

Temp  

Status  

My Home  

TM  

TM  

Feels Like  

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60%  

Heat to  

Cool to  

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Away  

Weather  

508223-03 03/2025  

Supersedes 01/2024  

Copyright 2025© Lennox Industries Inc.  

Dallas, Texas, USA  

Lennox^® S40 Smart Thermostat  

User Guide  

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Name	LENNOX S40 Smart Thermostat User Guide
Make	Lennox
Language	English
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File size	1.3 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• Lennox

LENNOX S40 Smart Thermostat User Guide Overview

Summary of Contents

• Page 1: Lennox S40 Smart Thermostat User Guide Copyright 2025© Lennox Industries Inc. Supersedes 01/2024
• Page 2: Temperature settings Wi-Fi Current temperature Using smart room sensors Humidity control Comfort features Setup and customization process Lennox smart room sensor Display features Smart zoning system
• Page 3: Humidification measurement and dew point adjustment controls. Heat and cool mode controls heating, cooling, humidification, and dehumidification without user involvement. Compatible with Lennox Smart Room Sensors for better temperature averaging throughout the home. Lennox Smart Air Quality Monitor provides alerts, recommendations, and triggers air purification on demand. The monitor detects and tracks particulates, carbon dioxide, and volatile organic compounds inside the home. PureAir systems provide time-based notifications of consumables including media filters and UVC bulbs. Lennox Smart Zoning supports up to four zones. Humiditrol Enhanced Dehumidification Accessory is available. ERV/HRV and fresh air dampers are supported when using a Lennox Equipment Interface Module. Improper installation or maintenance can cause property damage or personal injury.
• Page 4: Setup and customization process The S40 Setup Pending badge displays on the thermostat’s home screen after the dealer or installer has completed their portion of the setup process. Homeowners can complete the setup process by adding the Lennox S40 Smart Thermostat to their user account and later customizing their thermostat. The S40 Smart Thermostat has a built-in setup and customization process that guides the homeowner through steps like accepting the End User License Agreement and thermostat features. If the homeowner bypasses the setup and customization process, a S40 Pending Setup badge displays on the home screen until cleared. The setup process is completed in conjunction with the S40 Smart Thermostat and the Lennox Home app. The setup process allows homeowners to choose the language, accept the End User License Agreement, connect to the home Wi-Fi network, scan QR codes for the Lennox Home App, and pair the thermostat to the app. After installation, a S40 Setup Pending badge displays on the home screen, and Lennox recommends completing the setup process to experience the full potential of the thermostat. The customization process is completed through the Lennox Home App only. The customization process allows homeowners to start using the top features of the Lennox S40 Smart Thermostat according to their preferences. After completing the setup process, a “Customization is pending” badge appears on the home screen.
• Page 5: Press OK. Select No and press. The system asks whether the homeowner has an S40 User Account. Download the Lennox Home App screen displays. Scan the QR code and download the Lennox Home App. This phase of the Setup Process walks the homeowner through the steps of adding their Lennox S40 Smart Thermostat to their account. Follow the directions on the screen. The thermostat generates a PIN number. The Create Home or Select Existing Home screen displays. The Thermostat Added dialog displays. This message confirms the thermostat successfully paired with the mobile device and has been added to the user account.
• Page 6: Create home or select existing home. Select Create New Home and press. The Add Home screen displays. Complete the following fields: Home Name, Country/Region, Address 1, Address 2, City, State, Zip/Postal Code. Customize the S40 Smart Thermostat to advance to the next screen. The customization process guides homeowners through personalizing the top features of the Lennox S40 Smart Thermostat. Before customization, the thermostat must be set up and connected to a Wi-Fi network by a Lennox Dealer or installer. The newly entered Home Name now displays on the home screen of the thermostat. The customization process guides users through ten screens to personalize their Lennox S40 Smart Thermostat. Press the badge to begin the customization process.
• Page 7: Set schedules for energy efficiencies. The thermostat reduces system output and energy use when home occupants are away. Press Yes to set a schedule for energy efficiency or press No to bypass this step. Homeowners can press Exit at any point of the customization process to end the process. Press (-) or (+) to adjust the temperature for Heat to and Cool to. The Save Energy screen displays, enabling users to set a schedule. Press Add Period to customize a new schedule. The Allergen Defender feature monitors for poor air quality and high pollen levels. Select Yes to activate Allergen Defender or Circulate, or select No to opt out. Homeowners can reset Energy Efficiency schedules by pressing Restore to Default Settings.
• Page 8: Feels Like™ feature factors in outdoor temperature and indoor humidity for more accurate control of the temperatures in the home. Alerts and Notifications feature notifies homeowners when their S40 System requires service or maintenance. Select Yes to receive alerts and notifications or select No to opt out of the feature. Select Yes to activate Feels Like™ or select No to opt out of the feature. Performance Reports feature provides data on the system’s performance. Users that opt in are emailed a monthly performance report. Alerts and Notifications to Local Lennox Dealer feature notifies the homeowner’s local Lennox Dealer that the S40 System requires service or maintenance. Select Yes to alert the local Lennox Dealer or select No to opt out of the feature. Press to advance to the next screen. Alerts and notifications are sent to the email registered in the user account.
• Page 9: Advanced diagnostics and remote sharing feature enables the homeowner’s local Lennox dealer to remotely diagnose and troubleshoot system issues. Select Yes to grant permission for remote access to the system by a local Lennox dealer or select No to opt out of the feature. Homeowners can select from four screensaver options. The Smart Home Devices feature enables homeowners to access their Lennox S40 Smart Thermostat via various smart home devices. Tap the logo of choice for information on how to integrate the Lennox S40 Smart Thermostat. Select Yes to upload a photo as a screensaver or select No to opt out of the feature. Press to advance to the next screen. The selected photo displays in the Photo field. See “Display Settings” on page 24 for detailed instructions on how to change the display to one of the remaining three options.
• Page 10: S40 Smart Thermostat customization - complete Create a new user account Download the Lennox Home App from either the Apple App Store or Google Play to your mobile device. Verify that the thermostat is connected to the home Wi-Fi and that all indicators are green and check marked. The Lennox S40 Smart Thermostat must be set up before the homeowner can add the thermostat to their new account. Launch the Lennox Home App. Select Allow if the homeowner intends to upload a photo as a screensaver on the thermostat. The Allow Thermostat to access this device’s location pop-up dialog displays. Select Allow only while using the app if the homeowner intends to use the Smart Away feature to control the thermostat.
• Page 11: Select Create New Account. The Sign Up pop-up dialog displays. Click OK. The Registration screen displays. Complete all fields on the Registration screen. Select the box to agree to the Lennox End User License Agreement. Press Register.
• Page 12: Manually adding S40 smart thermostat to account If the home will have multiple S40 thermostats, then they all must be on the same 2.4GHz home Wi-Fi network to communicate with each other. The preferred method to create a new Lennox thermostat account and add the thermostat is through the Lennox Home App. This thermostat cannot connect to a home wireless router that uses more than 32 characters in the wireless access point name. This thermostat supports up to a 63 character Wi-Fi password, and passwords cannot contain blank spaces or % symbol. Lennox S40 and S30 smart thermostats are not designed to communicate with each other even when on the same network. Supported wireless network types include 802.11b, 802.11g, 802.11n, 802.11ac (Wi-Fi 5), and 802.11ax (Wi-Fi 6). It is important to provide your Lennox Home Comfort System dealership remote sharing and advanced diagnostics and troubleshooting options. Never use a home guest account and always use a secure connection physically located in the home where the thermostat is located. Consult router documentation on how to enable Wi-Fi security if the home Wi-Fi connection is unsecured.
• Page 13: Verify the thermostat connectivity status indicator appears as illustrated in “Figure 3. Thermostat Connectivity Status”. All connect icons will need to display green check marks across all connections. The thermostat and router should be located away from other devices that could possibly interfere with wireless communications. Examples of devices that could interfere include microwave ovens, wireless cameras, portable phones and bases, baby monitors, wireless speakers, Bluetooth devices, garage door openers, and neighbor’s wireless devices. To eliminate a possible source of interference, temporarily disable any devices and see if Wi-Fi performance has improved. Received Signal Strength Indication (RSSI) indicates the signal strength of the Wi-Fi router being received by the scanning device. The higher the RSSI number, the stronger the signal. Internet Protocol Address (IP address) is assigned by your home router for each network device. If the RSSI signal strength is between -9 to -69, then the signal strength is sufficient. Select Show Password to view characters entered.
• Page 14: Thermostat home screen details provide an overview of the system's functionality. Selecting status will display humidity level, various fan operations, schedules, and other system operations. Time and date selection shows detailed information and operational status of the thermostat and connected devices. Animated icons indicate active calls for cooling, heating, ventilation, and fan functions. The system name or zone name is displayed along with the actual room temperature marker. Heating and cooling adjustment tools are available for manual temperature control. Current room temperature may display Feels Like, Inside, or Average based on system setup. Various system operation status icons appear on the screen and under the status selection. Accuweather information is provided based on the user's account zip code. Manual settings allow the system to be configured to predefined set points.
• Page 15: In order to exit Away, select Cancel located on the bottom left-hand side of the Home screen. Selecting the Away is Active status notification will display the current set point range for high and low temperature settings. While in Away, the Away Set points are used to control the high and low temperature setting for the thermostat and all zones simultaneously if Smart Zoning is installed. The Away Set points can be changed from the default values by going to Menu > Settings > Away. Selecting the heat or cool set point indicators on the round temperature band displays the heat or cool menu screens. Both heating and cooling set point indicators on the round temperature band are displayed if the system is set to Heat/Cool mode. The default outdoor temperature is supplied by the outdoor air temperature sensor. This screen displays Lennox Smart Home devices and equipment such as multiple S40 Smart Thermostats on the same home network. Date and time are automatically set based on the address zip code if the thermostat is connected to the Internet. The user can manually put the system into away mode by pressing the Away icon located on the bottom left-hand side of the Home screen.
• Page 16: Selecting any item on this screen will display the detail screen for that device. When selecting Monitor Settings, the following options are available: Air Quality Monitor Name allows the user to rename the sensor using the virtual keyboard. A yellow or red dot with an explanation point indicates there is an alert condition for that specific device. About Air Quality Monitor will list model and serial numbers along with firmware version. Level of Indoor Air Cleanliness options are High, Medium, and Basic (Most Economical). For further details concerning zoning control, see “Smart Zoning System” on page 35. The Lennox Smart Room Sensor is currently not compatible with systems using the Lennox Smart Zoning System (iHarmony) installed. The Extender Setting screen includes: Extender Name, Device Type, and About Extender. The Lennox PureAir S is an optional product sold separately. You can set service reminders here for 1 day, 1 week, 1 month, 3 months, or custom.
• Page 17: Home and status screens icon descriptions provide an overview of various icons and their functions. The menu icon prompts user and installer menus. A notification icon appears when there are active notifications, indicating the number present. The Feels Like™ feature optimizes comfort by automating heating, cooling, and humidity settings. The Away icon activates energy-saving settings, adjusting temperatures to heat-to 62 and cool-to 85. Exiting Away mode can be done by pressing the Cancel icon. In zoning systems, all zones are set to a single heat-to and cool-to setting when Away is selected. The heating icon indicates the system is currently heating the home. The cooling icon shows the system is cooling the home. Humidifying and dehumidifying features help manage humidity levels in the home.
• Page 18: Defrosting indicates that the heat pump system is defrosting the outdoor unit coil. Supplemental heating is usually in the form of electric heating provided by the indoor unit for heat pumps operating in northern climates below 35°F (1.6°C). Emergency heat is used solely without the heat pump when temperatures are below the low balance point. If the outdoor temperature is above the high balance point, only the heat pump will operate. Auxiliary heating will operate if the outdoor temperature is below the low balance point. A five-minute safety delay prevents the compressor from operating too soon after shut-down. The ambient lockout notice appears on the home screen when the outdoor temperature is outside the balance point settings. Fan set to ON runs continuously until changed from the selected mode. Fan set to Auto follows the fan setting in the selected schedule. Fan set to Circulate cycles during periods of equipment inactivity based on user settings.
• Page 19: Allergen Defender can be activated through the menu settings to help clean the air during high pollen counts. The fan operates in Allergen Defender mode only when no other fan modes are active. Power interruptions may cause the thermostat to take longer to respond while searching for controls. Auxiliary heating is indicated when Aux Heat is active. Load shedding is an action taken to reduce electricity supply to avoid excessive load on the generating plant. Service Urgent indicates a problem with the system requiring a service call. Coasting allows the temperature to reach the desired set-point without system operation. The system actively ventilates and indicates the time the cycle will end. Canceling the energy savings function opts the system out of current events. Peak Monitoring will be active during specified time periods.
• Page 20: Home and status screens icon descriptions provide essential information about system functions. The system transitions to the next temperature setting based on a time indicator. Selecting the schedule hold icon displays a pop-up screen with options to hold, cancel, or set duration. Notifications appear when the air quality is poor, prompting the indoor unit fan to clean the air. Homeowners can view details or postpone air cleaning for specified time periods. Advanced diagnostics request icon indicates a local dealer's request for remote access to the thermostat. Access granted icon shows when the homeowner allows remote access for troubleshooting. Access denied icon appears when the homeowner does not permit remote access. Expired diagnostics request indicates the time period to accept remote access has lapsed. In-progress diagnostics icon signifies that the dealer is currently troubleshooting remotely.
• Page 21: Home and status screens icon descriptions provide important information about the thermostat's functionality. The advanced diagnostics access icon indicates that remote access has been canceled by the homeowner. This icon appears on the thermostat home screen when the cancellation occurs.
• Page 22: Press and hold the lock icon for 3 seconds to unlock (Partially Locked and Locked). Select the Menu button on the Home screen to display the Menu screen. Filters for displaying notifications include All Notifications, Service Urgent, and Maintenance. This section is only accessible if the thermostat has an active connection to Wi-Fi. Homeowners have the option to sign into an existing account or create a new account. The display will automatically turn on when approached if the proximity sensor is set to ON. Homeowners can view and edit information such as First and Last Name, Phone Number, Email, and Password. Options for the screen saver include OFF, Weather, Power Save, and photo. The available settings for outdoor temperature display are Accuweather or outdoor temperature sensor. Homeowners can turn on or off indoor humidity being displayed on the Home screen.
• Page 23: Lennox Dealer Support Access This screen allows the homeowner to set the operating mode of the system. Options are Emerg Heat, Heat Only, Heat/Cool, Cool Only, and Off. A great investment has been made in the home’s heating and cooling system and peak performance is expected by homeowners. With a simple ON/Always option, this S40 Smart Thermostat forever changes HVAC equipment diagnostics, maintenance, and repair. It provides basic maintenance notifications and alerts, performance reports, and the ability for dealers to remotely diagnose and troubleshoot. This proactive and responsive HVAC care is valid for the lifetime of the HVAC system. All schedule profiles can be customized including schedule name, starting time for each period, and related heating and cooling temperature settings for each period. Homeowners have the options to either display information already populated on this screen or edit the service contact information. Remote Sharing allows the service provider to remotely view the status of your system. Alerts and Notifications allow the service provider to be notified when the homeowner’s system needs maintenance.
• Page 24: Spring/Fall provides the average indoor cooling set points for home temperatures. Winter provides the average indoor heating set points for home temperatures. Save Energy provides the recommended Energy Star set points for energy savings. All of the above schedule profiles can be customized to meet your particular needs. On each schedule screen, there is an option to customize the experience further. At home day wake-up default time is 7:00 am with a low temperature setting of 67°F and a high temperature setting of 80°F. At home night sleep default time is 11:00 PM with a low temperature setting of 66°F and a high temperature setting of 84°F. Smart Away is used to set the temperature while the home is unoccupied. The default low temperature setting when away is 62°F and the high temperature setting is 85°F. Temperatures for any of the options can be adjusted using the sliding scale.
• Page 25: Homeowners can rename the schedule profile, assign day grouping, system mode, fan mode, and fan duration. Profile labeled No Schedule cannot be renamed or edited. Profile Schedule IQ renaming is not allowed. For a zoning system, any profile assigned to a specific zone will be affected by any customization made to that specific schedule profile. Options for fan operation include On, Auto, and Circulate. On indicates the system will run the fan continuously. Auto indicates the system will run during a call for heating or cooling only. Circulate will run a predetermined number of minutes to an hour, with settings ranging from 9 to 27 minutes per hour. It is recommended to rename Summer, Spring/Fall, Winter, and Save Energy to each specific zone for a unique schedule. The illustration shows how to rename the schedule profiles to match a specific zone.
• Page 26: Wi-Fi The system setting screen allows the homeowner to connect to their home Wi-Fi router and give their system a name. Most of the procedures listed in this section can be accomplished at the thermostat or using the Lennox Home App. The homeowner can manually put the system into away mode by pressing the Away icon. In away mode, the Away set points are used to control the system. The homeowner can modify the Away set points from the default values in Menu > Settings > Away. Smart Away is turned on for your system to run smart schedule. Use the Lennox Smart Thermostat app to control the temperatures in your home while you are away. Please make sure to install the S40 Thermostat App to participate in Smart Away. Selecting this menu item allows the homeowner to rename their system. There are currently 2 mobile devices participating.
• Page 27: Smart Away feature depends on the Lennox Home App running on the homeowner’s mobile device and being logged in to their account. The system will start to either increase or reduce the heating or cooling set point when the closest participating mobile device moves into the transition range. Once all participating mobile devices have moved beyond the specified range, the system sets the set points to the Away set points. Requires Wi-Fi and location settings to be enabled on the homeowner’s mobile device. Smart Away can be enabled from the mobile device once the Lennox Home App has been installed and launched. It is possible to have more than one mobile device participating in Smart Away for this system. The inner Away Fence is set by the user anywhere between 2 to 6 miles on the Lennox Home App. The outer fence for each participating mobile device will be automatically calculated by the Smart Away algorithm. Location services will need to be enabled for Smart Away to work correctly on mobile devices. Once all participating mobile devices have moved outside the transition range, the homeowner’s Away set points will be used to control the system.
• Page 28: Using Smart Room Sensors Homeowners can include individual Smart Room Sensors for better Feels Like™ control of the entire home. The temperature detected at each sensor factors into the Feels Like™ result when enabled. Ensure location services for the Smart Away feature are not auto-disabled by the Android operating system. When setting up the Lennox Home App, users must enable permissions for precise location. Feels Like™ is not a temperature setting but reflects the temperature based on current outdoor, indoor temperature, and indoor humidity. Sleep Mode allows one or more Smart Room Sensors to be the primary source for temperature in a room. Sleep Mode can turn off the temperature sensor in the main S40 Smart Thermostat. At least one Smart Room Sensor must be active during Sleep Mode, but multiple sensors can be set to Sleep Mode. Feels Like temperatures factor in outdoor temperature and indoor humidity for more accurate control. The words Feels Like™ will appear above the indoor temperature display when this feature is set to On.
• Page 29: Go to Menu > Settings > Current Temperature. The Sleep Mode feature displays beneath Participating Devices in Temperature Averaging Based on Sleep. Enable/disable Sleep Mode by clicking the toggle switch. When Sleep Mode is enabled, the time scheduling fields From and To display. When Sleep Mode is disabled, the From and To Scheduling fields are unavailable. Click the double dash in the From field to set the start time for Sleep Mode. Scroll to set the hour and minute to begin Sleep Mode. Select the Smart Room Sensor(s) and/or thermostat to participate in temperature averaging. The sensor(s) and Sleep Mode schedule display as confirmation of selections. Refer to figures for visual guidance on the Sleep Mode feature and settings.
• Page 30: At least one Smart Room Sensor must be ON to calculate the current temperature. This screen allows changes to how the system operates, including options for single set-point, heat pump mode, auxiliary heat, and safety protection. The Perfect Temperature option is available only in non-zoning systems, allowing control of both heating and cooling temperatures with one setting. When set to Perfect Temp, the Heat • Cool position indicator changes, displaying Auto instead of the normal mode. Perfect Temp is not compatible with Google Assistant, which cannot adjust the home temperature. The Heat Pump Mode option is available only with systems using a heat pump, with settings for normal and comfort. Auxiliary heat is used when the heat pump's capacity is insufficient, sometimes referred to as supplemental heat. Balance Point puts temperature limits on when the heat pump and auxiliary heat can operate together or independently. Allergen Defender can be turned on or off to help clean the air when the pollen count is high. Air circulation can be adjusted between 9 to 27 minutes per hour, running during any selected mode except when the system is off.
• Page 31: Humidity control options include settings for outdoor temperatures affecting heat sources. The system allows for both humidify and dehumidify options depending on installed accessories. Safety protection alerts homeowners when indoor temperatures reach set low or high thresholds. Humidification control options vary based on climate conditions and accessory installation. Dew point percentage slider adjustment tools are available for normal and max settings. Dehumidification set point percentage can be adjusted between 40% to 60%, with a default of 55%. No dehumidification accessory installed limits options to basic and max settings for humidity control. Dew point adjustments help manage condensation on windows, with a default setting of OFF. Overcooling adjustments are available to limit cooling while achieving dehumidification set points. Certain dehumidification settings are not applicable for systems using iHarmony zoning.
• Page 32: Climate IQ (Auto) automatically adjusts system run-time based on dehumidification set point and local weather conditions obtained from the Internet. Both overcooling and dehumidification set point slider adjustment tools are available for both Max and Climate IQ (Auto). The overcooling adjustment slider tool limits overcooling between 0ºF to 4ºF. Humidify + Dehumidify settings allow a combination of both humidification and dehumidification settings. When dew point is set to OFF, a dual purpose slider adjustment tool allows the homeowner to adjust the set point percentage for both humidification and dehumidification. Staged outdoor unit is recommended when the outdoor air is excessively humid. Variable capacity outdoor unit adjusts cooling based on installed duct sensor data and is recommended when the outdoor air is excessively humid. Discharge air temperature sensor is required for these thermostat modes to control relative humidity between 15% and 45%. This feature is applicable only to Lennox communicating thermostats with either Lennox communicating staged or variable capacity outdoor units. The following conditions must be met for either mode to operate: humidification mode has been enabled, unit is in HEAT mode, and humidification demand exists.
• Page 33: Smart zoning system Lennox Smart Zoning Control only functions with Lennox communicating systems. The Lennox Smart Room Sensor is not compatible with systems using the Lennox Smart Zoning System (iHarmony). By default, zoning is ON on the zoning control screen. If the homeowner wishes to place the system into central mode, then this setting must be OFF. The system will continue to fulfill the demand from zone 1 until satisfied or a maximum time of 20 minutes has been reached. After a five-minute delay, the system will begin operations to satisfy the cooling demand from zone 2. Dew point adjustment mode will change the humidification set point based on the outdoor temperature. Cooling demand is terminated when all zone demands for cooling are terminated. When Dehumidify is selected, a Dehumidification Set-Point adjustment tool is available and allows adjustments between 50% to 60%. Second stage cooling is energized when the discharge air temperature is 7°F higher than the set point of the cooling staging temperature settings.
• Page 34: Heating operation requires the consumer to register with their utility provider to enable the Peak Monitoring feature. When a zone thermostat demands heating, the zone damper opens, and heating equipment begins operating. Heating demand is terminated when all zone demands for heating are terminated or when the demand exceeds the changeover time limit while a cooling demand exists. A five-minute minimum off-time delay is initiated when heating demand is terminated. Enabling energy savings may result in a pop-up screen indicating success or failure. Second-stage heating activates if the discharge air temperature is lower than the heating staging temperature set point. Homeowners can enroll in energy savings by following on-screen prompts and verifying their utility provider's Demand Response Program. Reminders for maintenance can be set for various accessories, including filter replacements and UV bulb changes. Homeowners can customize temperature or pricing set points through their energy provider's settings. Peak Monitoring is a feature requirement for California, allowing utility companies to control the thermostat during peak energy events.
• Page 35: Canceling peak monitoring event is an option available on the Home screen. During an active energy savings event, updating certain settings will prompt a confirmation pop-up. PureAir S is an air purification system that addresses airborne particles, germs, and chemical odors. The option to cancel enrollment in Energy Savings is found in the settings menu. PureAir S utilizes a MERV 16 air filter, UVA light, and catalyst for air purification. Lennox Wireless Extenders and Smart Room Sensors can only be managed through the Lennox Home App. Ventilation options appear if a fresh air damper, ERV, or HRV is installed and configured. The homeowner can rename the thermostat and access information such as model and serial numbers. Ventilation mode offers selections for timed or ASHRAE settings, determined by the installer. Automatic updates for the thermostat are set to ON by default.
• Page 36: What is ASHRAE? ASHRAE 62.2 is a national standard that provides methods for achieving acceptable indoor air quality in typical residences. One of the standard three main components is whole house ventilation which is exhausting stale indoor air and replacing it with fresh outdoor air. The exhaust fan dilutes the air in the main living spaces with outside air to remove unavoidable contaminants. The whole house fan flow rate is determined based on the floor space and the number of bedrooms. The Lennox Smart Room Sensor is not compatible with systems that have the Lennox Smart Zoning System installed. The Lennox S40 Smart Thermostat can support up to six Lennox Smart Room Sensors. This section is for installers and technicians ONLY to customize system settings and run various diagnostic tests. The first device must be added by the technician in order to create the smart devices network. Unregister System means that the thermostat will no longer be linked to the homeowner’s email account. Options are to restart Smart Hub, thermostat, or both.
• Page 37: Selecting sensor settings allows the homeowner to include or exclude a specific Smart Room Sensor from temperature averaging. Verify that the sensor is not in direct sunlight, discharge vents, unconditioned space, or any other environmental conditions that could affect the temperature reading. If the Smart Room Sensor is in a suitable location and the actual room temperature does not match what the sensor is reporting, then the sensor may need to be replaced. Room averaging can be set using either the thermostat or Lennox Home app. Refer to the Smart Room Sensor Setup and Installation guide for information on devices, placement, and pairing with the S40 Smart Thermostat. The occupancy detection feature is built into every sensor, with settings for ON and OFF. When the occupancy feature is turned OFF, the thermostat will always include the sensor in temperature averaging. When the occupancy feature is turned ON, the thermostat will only include the sensor in temperature averaging if the room is occupied. The sensor temperature difference limit feature compares Smart Room Sensor readings to the thermostat's detected temperature. If the temperature reading difference is less or greater than 7ºF, the sensor will be excluded from participating in temperature averaging.
• Page 38: Lennox Smart Air Quality Monitor The Lennox S40 Smart Thermostat will begin displaying information from the Smart Air Quality Monitor once there is a blower/cooling/heating demand. Until the first thermostat demand, the SAQM will indicate it is calculating. When the Smart Air Quality Monitor detects poor indoor air quality (IAQ), it will pass that information on to the thermostat which will attempt to clean the air. If no IAQ equipment is installed, the thermostat will run the indoor unit blower to circulate air. A solid blue light indicates the signal strength is low or has lost connection to the thermostat. No blue light indicates signal strength is good. A flashing green light indicates the unit is in pairing mode. This device can only be installed by a professional installer. A single Lennox S40 Smart Thermostat can support one Lennox Smart Air Quality Monitor. The primary reason for the side switch is to turn off the internal fan if the device is installed in a bedroom.
• Page 39: The side switch on the SAQM when in the UP position turns on the internal fan and transmits air quality data to the thermostat. When the switch is set to the DOWN position, it will turn off the internal fan and stop air quality data to the thermostat. From the thermostat Home screen, select My Home. Select the Smart Air Quality Monitor icon to view the current details concerning your indoor air quality. An alert code 70003 displays, which indicates the switch is OFF. Homeowners can sign up to receive monthly performance reports of their system’s overall performance when customizing their thermostats. While the switch is in the DOWN position, the latest reading from the SAQM will be displayed on the thermostat. The dealer and homeowner may receive an email indicating that Alert Code 70003 is a no cool, no heat condition. PM stands for particulate matter, the term for a mixture of solid particles and liquid droplets found in the air. Volatile organic compounds (VOC) are a combination of gases and odors released from a variety of sources.
• Page 40: View details and postpone cleaning air. When the Lennox Smart Air Quality Monitor detects poor air quality, it activates the indoor unit fan or other air quality devices. Homeowners can view details or postpone air cleaning from the thermostat home screen. Options to postpone air cleaning include 1, 2, 4, 8, or 24 hours. The most current information from Lennox is available via QR codes on QuickStart Guides or product packaging. An icon displays on the home screen when the system is cleaning the air. Select Monitor Settings > Level of Indoor Air Cleanliness to adjust air quality settings. Options for air cleanliness levels are High, Medium, and Basic. For third-party applications to function, the thermostat must be connected to the Internet. Users can control the thermostat with Amazon Alexa after integrating it with the Amazon Alexa app.
• Page 41: Even though the thermostat supports half degree settings in Celsius, currently, users can pair only one home that is listed in their Lennox User Account with Amazon Alexa. Amazon Alexa only supports whole degrees. The first temperature adjustment that gets made will set the temperature to a whole degree, if it was not already. In Heat/Cool mode, the system can automatically switch between heating and cooling as needed. Amazon Alexa will confirm the request by saying, “Hallway is in Auto mode, aiming for 70 degrees.” Download the Google Home app from Google Play or the App Store on a compatible mobile device and then follow the on-screen steps to finish setup. Raising or lowering the temperature is not supported when using a schedule or Perfect Temp feature. The following voice commands must be used for systems that remain as “System” or “system.” If the thermostat is in Away or Smart Away mode, any Amazon Alexa commands to change thermostat temperature will not be successful.
• Page 42: Additional help is available through Google's online support. Control4 is a leading control and automation platform that integrates various smart devices for a seamless customer experience. Control4 provides an easy-to-use interface for controlling Lennox Smart Thermostats. Settings include displaying all systems and zones, turning systems on or off, changing manual modes, adjusting heating/cooling set points, and changing fan modes. Building36 is another leading control and automation company offering next-generation smart home solutions. Building36 integrates control for HVAC, water, video, lighting/appliance, and security into one location. The Building36 Dashboard and Home Mobile App allow users to control the Lennox S40 Smart Thermostat. Settings for Building36 also include displaying systems and zones, turning systems on or off, changing manual modes, adjusting heating/cooling set points, and changing fan modes.
• Page 43: Alert code priority types and notification options provide a framework for understanding system alerts. The alert priority condition visibility table outlines various notification options based on alert priority. Service urgent indicates that the system is in a no heat/no cool state or not operating, requiring a dealer service call. Service soon alerts indicate that the system is not reaching the set point or is partially operating, necessitating dealer service within 24-48 hours. Maintenance alerts serve as reminders for homeowners to change filters, replace UV lamps, and tune up systems. Information alerts are directed only to dealers and are for informational purposes. Homeowners must enable email notifications to receive alerts by going to the user account settings. Dealers need homeowner approval to receive service alerts and emails, which can be enabled through dealer support access settings. Alerts may escalate from service soon to service urgent after a specific timer period or number of instances. The document emphasizes the importance of timely service and maintenance for optimal system performance.
• Page 44: Temporary Advanced Diagnostics Access allows a local Lennox Dealer remote access to the homeowner’s thermostat for diagnostics and troubleshooting. Homeowners can opt out of this feature, which prevents remote troubleshooting by the dealer. Through the Service Dashboard, dealers can send a Temporary Advanced Diagnostics request to homeowners. Homeowners must accept the request to grant access, which lasts for 24 hours. After 24 hours, dealer access is automatically terminated. The Advanced Diagnostics in progress icon displays on the thermostat’s home screen during this period. Homeowners receive notifications on their mobile device when a Temporary Advanced Diagnostics Access Request arrives. The mobile device must allow notifications from the Lennox Home App to receive access requests. Homeowners can press Allow to grant the dealer temporary access to the thermostat. The Advanced Diagnostics Current Status confirms if a dealer/technician is connected to the thermostat.
• Page 45: End Advanced Diagnostics Access Press the Advanced Diagnostics in progress icon/badge. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: This device may not cause harmful interference, and this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. If this equipment does cause harmful interference to radio or television reception, the user is encouraged to try to correct the interference by one of the following measures: reorient or relocate the receiving antenna, increase the separation between the equipment and receiver, connect the equipment into an outlet on a circuit different from that to which the receiver is connected, consult the dealer or an experienced radio/TV technician for help. This device meets the FCC and ISED requirements for RF exposure in public or uncontrolled environments. This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: this device may not cause interference, and this device must accept any interference, including interference that may cause undesired operation of the device.