The Lennox® S40 Smart thermostat recognizes and connects to all Lennox communicating products to automatically configure and control the heating/ cooling system (based on user-specified settings) for the highest level of comfort, performance and efficiency
Specifications for the display are as followings:
External Component Locations
Reboot Button, Micro USB Connection and Built-in Sensors
The following diagrams in this section illustrates the basic Lennox control wiring for all compatible components.
NOTE: The screen can also be activated by touching it.
IMPORTANT
Due to Lennox’ ongoing commitment to quality, features and options are subject to change without notice and without incurring liability.
Improper installation, adjustment, alteration, service or maintenance can cause property damage or personal injury. Installation and service must be performed by a qualified installer or servicing agency.
Scan the QR codes listed as follows to download the specific application that is compatible with your mobile device.
Lennox Smart Technician App
Lennox Smart Thermostat App
Multiple S40 Thermostats in the Home
If your home will have multiple S40 thermostats then they all MUST be on the same 2.4GHz Home Wi-Fi network in order to communicate with each other.
Wi-Fi Considerations
Supported Wi-Fi Network Types
Supported wireless network types are listed as follows:
| Standard | Description |
| 802.11b | Compatible. |
| 802.11g | Compatible. |
| 802.11n (Wi-Fi 4) | Compatible. |
| 802.11ac (Wi-Fi 5) | Compatible. NOTE: MIMO is not supported. |
|
802.11ax (Wi-Fi 6) | Not directly supported. Wi-Fi 6 routers are 100% backwards compatible with Wi-Fi 5 and older Wi-Fi devices. NOTE: MIMO is not supported. |
Connecting to a Visible Home Wi-Fi Access Point
Connecting to a Hidden Wi-Fi Access Point
Electromagnetic Interference Causing Poor Connectivity
Locate the thermostat and router away from other devices that could possibility interfere with wireless communications. Some examples of other devices that could interfere are:
To eliminate a possible source of interference, temporally disable any devices and see if Wi-Fi performance has improved.
The following terminology is used in this troubleshooting section:
Received Signal Strength Indicator (RSSI)
The RSSI can be viewed from the thermostat.
IMPORTANT The preferred method to creating a new Lennox thermostat account and adding the thermostat is by using the Lennox Smart Thermostat App . You have two methods in creating your account. You can use either the thermostat or the Lennox Smart Thermostat App.
Using the Thermost
Using the Lennox Smart Thermostat App
NOTE: The following example was using and Android 11 mobile device. Starting with Android 12 there are new screens addressing precise location. Always enable precise location when using the Smart Away feature. All iOS mobile devices as well will require precise location be enabled for the Smart Away feature to function correctly.
Large display of current inside temperature (°F or °C) Heating and Cooling Set point Indicators on the round temperature band
Current cooling set point temperature Button (Cool-To)
Current heating set point temperature Button (Heat-To)
Selecting the heat or cool set point indicators on the round temperature band, or selecting the Heat-To or Cool-To buttons displays the heat or cool menu screens Both heating and cooling set point indicators on the round temperature band and the Heat-To and Cool-To buttons are displayed if the system is set to Heat/Cool mode or if an active schedule is set to Heat/Cool mode.
Current Outdoor Temperature and Weather Forecast
Displays current outdoor temperature in °F or °C and the current weather forecast. The default outdoor temperature is supplied by the outdoor air temperature sensor or the Wi-Fi data connection (homeowner selectable on the thermostat). The outdoor sensor is furnished as standard with Lennox® Communicating outdoor units, optional for conventional units.
Time and Date Display
Displays current date and time
NOTE: Date and time are automatically set based on the address zip code if the thermostat is connected to the Internet and user account completed. Manual adjustment can be made if the thermostat is not connected.
Humidity Display
Displays the current inside relative humidity below current indoor temperature.
Away
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. When the system is in Away a status notification (Away is Active) is displayed on the right-hand side of the home screen.
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. There is also the option to select Cancel here as well by selecting Yes. 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.
Temp
Returns to the thermostat home screen or the home screen for a specific zone if Smart Zoning is installed. Displays current temperature screen for the current system where the thermostat and sensors are located.
Select the Temp button from the Status or My Home screen to return to the thermostat home screen or last zone viewed.
Status
Displays current system operating status for the current system/area where the thermostat and sensors are located. Details such as humidity levels, Feels Like being active, any of the various fan modes and various other system background activities.
My Home
Lennox Smart Home devices and equipment such as multiple S40 Thermostats on the same home network, Smart Room Sensors, Wireless Extenders, Air Quality Monitor, PureAir S and Zoning Control are all optionally purchased items and will appear on this screen if installed.
This screen will display multiple thermostats in the home. It will also display others devices such as Lennox Smart Zoning (up to four zones per thermostat), Lennox Smart Sensor, Lennox Smart Air Quality Monitor and PureAir S.
Thermostats and Zones
Selecting the icon will bring up either the thermostat home screen or in a zoning system the home screen for the specific zone selected if zoning is installed. For further details concerning zoning control, see “Smart Zoning System” on page 28.
IMPORTANT The Lennox Smart Room Sensor is currently not compatible with systems using the Lennox Smart Zoning System (iHarmony) installed.
NOTE: The Lennox Smart Room Sensor is an optional accessory sold separately.
Selecting this options will display the details for the sensor selected. What is displayed is the current temperature for the room that the sensor is located in.
Additional details include:
Lennox Smart Air Quality Monitor
NOTE: The Lennox Smart Air Quality Monitor is an optional product sold separately.
Selecting this option will display the Current Air Quality. Color indicators are Green indicates good, Yellow indicates fair and Red indicates poor. In addition a bluetooth signal strength indicator is provided to show the signal status.
There are also three options that can be selected. Those options are Monitor Settings, Air Pollutants and More Information.
When selecting Monitor Settings the following options are available:
Information concerning Air Pollutants and More Information can be found further in this guide (see “Lennox Smart Air Quality Monitor” on page 33).
Lennox Wireless Extender (BLE)
NOTE: The Lennox Wireless Extender is an optional product sold separately.
Selecting this icon will bring up the wireless strength indicator. There is an additional selection called Extender Settings. This screen includes:
NOTE: The Lennox PureAir S is an optional product sold separately.
Selecting this option will display the PureAir S filter life. Red indicates 1-10% filter life left, yellow indicates 11-30% filter life left and green indicates 31-100 filter life left. Also available are:
Table 2. Home and Status Screens Icon Descriptions
| Icon | Function or Screen Text | Purpose |
| | Menu | Selecting this icon will bring up user and installer menus. |
| Menu with Notification Icon | If there are one or more notifications this icon will appear over the menu icon. The number in the center indicates how many active notification are present. | |
| | Feels Like is Active or Turning Feels Like on | |
| | Smart Away is Active or Away is Active | When the away icon is Selected, the system will automatically use energy saving settings – heat-to 62 (16.5) and cool-to 85 (29.5). Temperatures can be adjusted by pressing on the available temperature setting (i.e., heat-to or cool-to). To exit away, press the cancel icon. In a zoning system, all zones are set to a single heat-to and cool-too setting. Note that when manually selecting Away from the home screen, the Smart Away feature (if enabled under settings) will be temporally disabled until Away is canceled. |
| | Heating | System is heating the home. This animated icon will appear above the system name on the home screen. |
| |
Cooling |
System is cooling the home. This animated icon will appear above the system name on the home screen. |
| | Humidifying | If humidification equipment is installed and configured, the system will display this message when adding humidity to the air in the home. |
| | Dehumidifying | The system can be used in cooling mode to help remove excessive humidity as determined by the user setting. Go to Menu > Settings > Humidity > and turn on dehumidify. Then adjust the acceptable low and high humidity levels in the home with the dehumidification set-point slider. |
Table 2. Home and Status Screens Icon Descriptions
| Icon | Function or Screen Text | Purpose |
| |
Defrosting |
The heat pump system is defrosting the outdoor unit coil (only when required). |
| | Emergency Heat | All heat pumps operating in northern climates below 35°F (1.6°C) normally need a supplemental heating source. Usually it is in the form of electric heating provided by the indoor unit. Other sources could be gas, oil, or hot-water back-up systems as well. The supplemental heat is also referred to as “second-stage” or “back-up” heating, with “first-stage” being the heat pump only. Emergency heat is when you use your supplemental heat (2nd stage) by itself, without the use of your heat pump (1st stage heat). Not available for non-heat pump systems. |
| |
Auxiliary Heat | Is only available with heat pump system. If outdoor temperature is above the high balance point, only the heat pump will operate – default 50°F (10°C) high. If outdoor temperature is below the low balance point, only auxiliary heating will operate – default 25°F (-4.0°C) low. If outdoor temperature is in-between the high and low balance point, both the heat pump and auxiliary heat sources can operate. |
| | Will start soon | A five minute safety delay prevents the compressor from operating too soon after shut-down to allow internal pressures to equalize. |
| |
Ambient lockout | This indicates that either the outdoor temperature is above or below the balance point temperature settings. The low balance point setting prevents heat pump heating below the set point and back up heat will be used. Typically the default is 25°F (-4.0°C), but that setting can be adjusted by your dealer. At 25°F (-4.0°C) or below for example, only auxiliary heating (electric or gas) is used. If the high balance point is set to 50°F (10°C) for example, which is also adjustable by your dealer, then auxiliary heat will not be allowed. Only heat pump heating will be used. Anytime the outdoor temperature is below or above the balance point temperature settings, the ambient lockout notice will appear on the home screen. |
| | Fan is running | Fan set to ON. Fan is NOT following the schedule and runs continuously until it is changed from the selected mode. |
| | Fan in auto mode is active. | Fan set to Auto. Fan will follow the fan setting in the selected schedule. |
| | Fan in circulate mode is active. | Fan set to Circulate. Fan is following schedule and cycles during periods of equipment inactivity. Circulate run time is dependent on user settings. |
| Icon | Function or Screen Text | Purpose |
| | Fan in Allergen Defender mode is active | Allergen Defender: Go to Menu > Settings > Fan to turn on or off Allergen Defender. Internet weather must be enabled and the pollen count is high for the following pollens (Grass, Ragweed, Mold, Tree and Overall Pollen) the fan will run between heating or cooling demands to help clean the air. Works best with MERV 11 or higher filter. Allergen Defender only runs when no other fan modes (On, Auto or Circulate) are being utilized. |
| | System Under Test | Typically occurs when the system has had a power interruption. The thermostat starts to look for the indoor and outdoor controls. Sometimes the outdoor control takes longer to boot up and therefore does not respond to inquiry by the thermostat. Recycle power to system may resolve issue. |
| |
Aux Heat |
Auxiliary heating is active. |
| | Load shedding, wait time 45 min | Action to reduce the load on something, especially the interruption of an electricity supply to avoid excessive load on the generating plant. |
| | Service Urgent | Service Urgent means that a service call is needed to get the system running. Selecting the icon will display a pop-up screen. Service Urgent. The system has encountered a problem. Alarm ID: xxxx and a description of the alarm is provided. Select OK to cancel the pop-up screen. |
| | Coasting to Perfect Temp |
Coasting allows the current temperature to reach the desired single set-point without the system doing any work. The red arrow indicates the temperature is less than the desired set point. The blue arrow indicates is greater than the desired set point. |
| | Coasting to Perfect Temp | |
|
| Ventilating or Ventilating unit (specific Time) | This indicates the system is actively ventilating and the precise time the cycle will end. Selecting cancel will terminate the current ventilation session. Selecting the icon will display a pop-up screen. Ventilating until x:xx pm. Do you wish to cancel. Options are No or Yes. |
| Icon | Function or Screen Text | Purpose |
| | Peak Monitoring until x:xx pm – x:xx pm | The utility company will automatically set the energy savings time period. You can select cancel to exit this mode. By canceling you will be opting the system out of the current active energy savings events. A pop-up screen will ask you to verify this is what you wish to do. Selecting the icon will display a pop-up screen. Peak Monitoring will be active from x:xx pm to x:xx pm. |
| Transitioning to next schedule | The system is following an active schedule and is transitioning to the next temperature setting based on a time indicator. | |
| Schedule hold until next period | Selecting the icon will display a pop-up screen. Schedule will hold until next schedule setting. There is also the option to select duration of hold or cancel. Options to select are Cancel, Duration and Hold. | |
| Schedule Hold until xxxx | Two pop-up may appear. Schedule will hold. Do you wish to cancel? Options are Yes or No. Schedule will hold until xxxx. Do you wish to cancel? Options are Yes or No. | |
| | Cleaning Air | When the Lennox Smart Air Quality Monitor has determined that there is poor air quality in the home it will run the indoor unit fan or any other indoor air quality devices installed to clean the air. Selecting this notification on the thermostat home screen will allow you to view details concerning the air quality or postpone the air cleaning for a specified time period. From the thermostat home screen select Cleaning Air and then you have the option to view details and postpone. Selecting postpone will display a screen where you can select 1, 2, 4, 8 and 24 hours. |
| | Postponing Cleaning Air |
Select the Menu button on the home screen to display the Menu screen. If multiple thermostat control systems are available they will be shown below the General menu settings.
Notifications
Filters for displaying notifications are All Notifications (options that can be checked off are All Notification, Service Urgent and Maintenance) The second filter option is All Time Periods and the selection options are All Time Periods, Last 24 hours, Last 30 days and Last 12 months.
User Account
Display Settings The available settings are:
NOTE: Lock screen can also be used to clean the thermostat screen.
IMPORTANT You have made an investment in your heating and cooling system and you expect peak performance. With a simple, ON / Always option, this new 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. Promising peace of mind by doing away with unnecessary dealer visits, avoiding potential repair costs, and ensuring nothing short of perfect air. In some instances, the dealer may be able to correct a problem without ever having to come to your home, saving you time and money.
Local Lennox Dealer Info: Here you have the options to either just display information already populated on this screen or add or correct the service contact information. This is where you can add details such as Name, Country, Address, phone, email and website information.
Dealer Support Access:
Alerts and Notifications:
Allows service provider to be notified when your systems needs maintenance. By default this is set to OFF.
Mode This screen will allow the user to set the operating mode of the system. Options are Emerg Heat, Heat Only, Heat / Cool, Cool Only and Off
Schedule (Single Zone) All schedule profiles shown in Figure 7 can be can be customized including schedule name, starting time for each period and related heating and cooling temperature settings for each period.
Schedule Profiles
Schedule Options
On each schedule screen except for Schedule IQ, there is an option located in the top right-hand corner of the screen that will allow you to customized your experience even further.
On the schedule options screen, you can rename the schedule profile, assign day grouping, system mode, fan mode, fan duration and restore to default.
Schedules (Zoning)
For a zoning system, any profile that is assigned to a specific zone will be affected by any customization you make to that specific schedule profile.
IMPORTANT If you need a unique schedule profile for a specific zone, it is recommended to rename Summer, Spring/Fall, Winter and Save Energy to each specific zone. Doing so will allow you to have a unique schedule for a specific zone.
The following illustration is an example how the to rename the schedule profiles to match a specific zone in order to have a unique schedule just for a specific zone.
NOTE: Profile labeled No Schedule cannot be renamed or edited. Profile Schedule IQ renaming is not allowed.
Options are:
Settings
The system setting screen will allow the homeowner to connect to their home Wi-Fi router and give their system a name.
System Info
Selecting this menu item will allow you to rename your system.
Wi-Fi
See “Figure 2. Thermostat Connectivity Status” on page 6 for information on how to connect to your home Wi-Fi network.
NOTE: Most of the procedures listed in this section can be accomplished at the thermostat or using the Lennox S40 Thermostat App or consumer web portal.
Manual Away
The user can manually put the system into away mode by pressing the “away” icon. When the system is in away mode, the horseshoe is grayed-out and shows the “away” status text. In order to exit away mode, the user can press the “cancel” icon. In away mode, the away set points are used to control the system. The user can modify the away set points from the default values in Menu > Settings > Away.
Smart Away
Both Home Info and Account options must be completed before this feature can be enabled.
The Smart Away feature depends on:
Smart Away can also be enabled from your mobile device once you have installed the Lennox S40 Thermostat App and logged in. Go to the Menu > Settings > Away and turn ON Smart Away. To allow the mobile device you are on to use this feature, turn ON participate. The away fence option will appear and by default, the setting is two miles (3 km). The range for this setting is 2 to 6 miles (3.00 to 9.50 km).
Inner and Outer Away Fences
The inner away fence is set by the user anywhere between 2 to 6 miles (3.00 to 9.50 km) on the mobile app. This setting can be different for each participating mobile device. When any of the participating mobile devices are located inside of its inner away fence, the system will not be in Smart Away; the system will use the temperature set points defined by the schedule or what was manually set. Once the inner away fence is set, the outer fence for each participating mobile device will be automatically calculated by the Smart Away algorithm.
Transition Set Points
When the closest participating mobile device is between the inner and outer away fences, the thermostat will show the Smart Away indicator. The system will use transition set points to heat or cool the home. The transition temperature set points are automatically calculated by the Smart Away algorithm using a combination of the home and away set points.
Away Set Points
Once all participating mobile devices have moved outside the transition range, the thermostat will continue to show the Smart Away indicator, and the user-set away set points will be used to control the system.
Example:
Multiple Mobile Devices
It is possible to have more than one mobile device participating in Smart Away for this system. The away fence can be set to the same value or different values for each mobile device. The thermostat will not show the Smart Away indicator until all devices have moved past their inner away fence, and the system will not reach the user-set away set points until all devices have moved past their outer fence.
NOTE: Smart Away will be canceled when the system is enrolled in energy savings with a utility provider and a energy saving event is active.
Mobile Device Location Services
To use Smart Away you need to be running IOS 12, 13, 14 or 15 for Location Services Settings.
To use Smart Away on your Android device, you will need to be running Android Version 9 or higher. Location Services Settings are as follows:
Feels Like
This feature is not a temperature setting but the temperature that the space feels like based on current outdoor and indoor temperatures and indoor humidity.
When Feels Like is set to On, the words Feels Like will appear above the indoor temperature display on the home screen.
When Lennox Smart Room Sensors are installed in the home the homeowner has the option to include individual smart room sensors for determining a better Feels Like control of the entire home. Using the temperature detected at each sensor will be factored into the Feels Like result when enabled.
Current Temperature
Allergen Defender
Go to Menu > Settings > Fan to turn on or off Allergen Defender. Internet weather must be enabled and the pollen count is high for the following pollens (Grass, Ragweed, Mold, Tree and Overall Pollen) the fan will run between heating or cooling demands to help clean the air. Works best with MERV 11 or higher filter.
Circulation Timer Adjustment
Circulate air can be adjusted on this screen. Adjustments between 9 to 27 minute duration per hour. The circulate option runs during any mode selected except when the system is turned off.
Heat / Cool
This screen allows changes to how the system operates. Options are single set-point, heat pump mode (normal or comfort), auxiliary heat and safety protection.
Perfect Temperature
Wider Set-Point Range
Changes the default low and high maximum temperature setting from 60-90°F to 40-99°F (15.5 – 32.0°C to 4.5 – 37.0°C).
Auxiliary Heat
When the outdoor temperature is above the high balance point, only the heat pump is allowed to run. When outdoor temperatures are below the low balance point, only the auxiliary heat source is allowed to run. When outdoor temperatures are between the high and low balance points, then both the heat pump and auxiliary heat source are allowed to run.
Auxiliary heat is the use of an additional heat source, when the heat pump BTU capacity is not sufficient to keep up with the home’s heating demand; sometimes it is also called supplemental heat. When used in a dual-fuel mode, auxiliary heating is accomplished with a gas or oil fired unit. In this mode of operation, the heat pump must shut down and uses just the auxiliary heating unit for heating.
If the system is an air handler with electric heat, the auxiliary heat will be in conjunction with the heat pump when the home heating requires it. Another use of auxiliary heat with heat pump systems includes a setting called balance point. Balance point puts temperature limits on when the heat pump and electric heat work together or independently.
Safety Protection
Alerts you if the home gets too cold or hot. This is set under this menu option on the setting for both low and high temperatures. The system will automatically turn on either cooling or heating if the home’s interior temperature reaches either the low or high setting. A notification is also sent to the Home screen notification area and Lennox S40 Thermostat App.
Some options that are available under this section are dependent on type of equipment (indoor and outdoor units) and humidification accessory is installed.
Adjustment Slider Tools
Humidity Control
The following options are available under humidity control:
When a humidification accessory is installed and humidify is enabled, the options are as follows:
IMPORTANT The following dehumidification settings are not applicable and ignored on systems employing iHarmony Zoning.
No Dehumidification Accessory Installed
When dehumidify is enabled and no dehumidifier accessory is installed, the dehumidification options are as follows:
Humidify + Dehumidify Settings
When this option is selected, a combination of both humidification and dehumidification settings are available.
When dew point is set to OFF. Then a dual purpose slider adjustment tool will appear. This tool will allow you to adjust the set point percentage for both humidification (left slider) and dehumidification (right slider). Range is 15% to 60% humidity.When this option is selected, a combination of both humidification and dehumidification settings are available.
When dew point is set to OFF. Then a dual purpose slider adjustment tool will appear. This tool will allow you to adjust the set point percentage for both humidification (left slider) and dehumidification (right slider). Range is 15% to 60% humidity.
Table 3. Humidity Control Modes of Operations
| Function | Setting Mode |
Description |
| Humidification Only |
Normal | These thermostat modes allow the homeowner to control the relative humidity (RH) between 15% and 45%. The following conditions must be met for either mode to operate: • Humidification mode has been enabled • Unit is in HEAT mode • Humidification demand exists Additionally, the NORMAL mode requires that heat demand exists. |
|
Max | ||
| Dehumidification Only |
Normal | This setting is recommended when the air outside is not too humid and the outdoor unit is either staged or variable capacity. |
|
Max | • Staged Outdoor Unit: This setting is recommended when the outdoor air is excessively humid. This setting may cool your home below the set temperature in order to remove excessive indoor humidity. • Variable Capacity Outdoor Unit: Recommend when the outdoor air is excessively humid. This setting adjusts cooling based on installed duct sensor data. This setting may cool your home below the set temperature. NOTE: Discharge air temperature sensor (catalog number 88K38) is required. | |
| Function | Setting Mode |
Description | |||
| Dehumidification Only |
Climate IQ (Auto) | This feature is applicable only to Lennox communicating thermostats with either Lennox communicating staged or variable capacity outdoor units only. This setting automatically adjusts both indoor fan speed and cooling power based on local climate conditions using Climate IQ® technology. This setting may cool your home below the set temperature. | |||
| The below adjustment tools are only available with either Max or Climate IQ setting selected. | |||||
| Function | Setting Mode |
Description |
| Dew Point | Dew point adjustment mode will change the humidification set point based on the outdoor temperature and a user-defined dew point adjustment setting. NOTE: Dew Point – Adjustment requires an outdoor temperature sensor and is automatically controlled by the outside temperature. | |
Dehumidification Accessory Installed
When either an Auxiliary Dehumidifier or Humiditrol equipment is installed the settings available are Off and Dehumidify. When Dehumidify is selected a Dehumidification Set-Point adjustment tool is available and allows adjustments between 50% to 60%.
NOTE: Lennox Zoning Control only work with Lennox communicating systems.
IMPORTANT The Lennox Smart Room Sensor is not compatible with systems using the Lennox Smart Zoning System (iHarmony) installed.
For user setting options, go to Menu > Settings > Zoning Control. By default Zoning is ON on the Zoning Control screen. If you wish to place the system into central mode then turn this setting OFF. You can also rename each zone from this screen.
Heating / Cooling Changeover
The following is an example of how the zoning system operates during a heating / cooling changeover. When the system is satisfying a call from zone 1 for heating and receives a call for cooling from zone 2, the following will occur:
The system will continue to operate in this manner each time it receives a zone call that is opposite of the current mode of operation (heating or cooling).
Cooling Operation
When a zone thermostat makes a demand for cooling, the zone damper opens and the cooling equipment begins operating. Cooling demand is terminated when:
Heating Operation
When a zone thermostat makes a demand for heating, the zone damper opens and heating equipment begins operating. Heating demand is terminated when:
This section allows the user to setup reminders for various accessories. By default all listed items are disabled. The reminders can be set for 3, 6, 12 or 24 months and a custom reminder by specific date can be set. Reminders options are:
Table 4. Maintenance Alerts
| Number | Reminder |
| 3000 | Filter 1 |
| 3001 | Filter 2 |
| 3002 | Humidifier Pad |
| 3003 | UV Light |
| 3004 | Maintenance |
| 3005 | PureAir Maintenance |
Peak Monitoring
Peak Monitoring is currently a feature requirement for the State of California. Enrolling into the energy saving program will allow your utility company to control your thermostat during peak energy events. An icon on the home page will indicate when the system is in an active energy savings event. Enrollment is a two-step process for consumers. The first step requires the consumer to register with their utility provider before the thermostat settings can be enabled to take advantage of the Peak Monitoring feature.
Enable Peak Monitoring
Go to Menu > Settings > Peak Monitoring and turn on enable energy savings. This will automatically get the required certification for your thermostat.
NOTE: If enabling energy savings is successful or not successful a pop-up screen will appear indicating either. If unsuccessful, try again in a few minutes.
Enroll in Peak Monitoring
The next screen will allow you to enroll in energy savings. Follow the on-screen prompts to continue. Detail on-screen instructions are provided.
Peak Monitoring Settings
This screen will allow you to use your energy provider’s default temperature or pricing set points. You can also customize these settings by selecting the following.
Canceling Peak Monitoring Event
The option to cancel will appear along the right side of the home screen. When in an active energy savings event and you attempt to update any of the following settings, a pop-up window will appear confirming you wish to exit the active energy savings event which could result in higher energy consumption during the event period:
Cancel Enrollment
The option to cancel enrollment in Energy Savings can be found by going to Menu > Settings > Peak Monitoring > Energy Savings Settings > Cancel Enrollment.
Devices
Lennox Wireless Extenders and Smart Room Sensors can only be added or removed using the Lennox Thermostat App. For more information concerning Lennox Smart Devices, see “Lennox Smart Devices” on page 32. The homeowner can add or remove Lennox Smart Room Sensors and Lennox Wireless Extenders to the thermostat only if at least one device has already been added first by your installer.
NOTE: For more information on setup, placement and pairing of smart room sensors and wireless extenders, see the Smart Sensor Installation and Setup Guide provided with the device.
PureAir S is an air purification system that cleans the air in your home by addressing all three types of indoor air pollutants an:
PureAir S uses a MERV 16 air filter, UVA light and catalyst to work. On this screen you can turn ON or OFF the PureAir S Life. You can also send a maintenance reminder based on sensor, calendar or run-time.
Ventilation
This option will only appear if a fresh air damper, ERV or HRV is installed and configured by your installer. Either ERV or HRV could be configured as single or two-stage if applicable.
Menu Selection
For Ventilation Mode, there are three possible selections which are:
What is ASHRAE?
ASHRAE 62.2 is a national standard that provides methods for achieving acceptable indoor air quality in typical residences. It was developed and is maintained by the American Society of Heating and Air-Conditioning Engineers (ASHRAE). 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 from people, pets, cleaning, off gassing, etc. The whole house fan flow rate is determined based on the floor space and the number of bedrooms. The whole house fan provides multiple air exchanges within the home each day. The operation can be continuous or intermittent (much higher airflow cycled by a timer) if 1 zone or less. For more information about ASHRAE, go to https://www.ashrae.org.
Advanced Settings
This section is for installers and technicians ONLY to customize system settings and run various diagnostic tests.
View Support Service Control Center
Allows installers and technicians to perform custom configurations tailored for the homeowner’s unique requirements.
Restart
Options are to restart Smart Hub, thermostat or both.
Unregister System
Unregister System means that your thermostat will no loner be linked to your email account.
IMPORTANT The Lennox Smart Room Sensor is not compatible with systems that have the Lennox Smart Zoning System (iHarmony) installed. The Lennox S40 Smart Thermostat can support up to six Lennox Smart Room Sensors.
Adding and Removing Smart Room Sensor
Please refer to the Smart Room Sensor Installation and Setup Guide for information on the devices, placement and pairing using the Thermostat App.
IMPORTANT The first device must be added by the technician in order to create the smart devices network. Thereafter the homeowner can add or remove devices using the Lennox Smart Thermostat App.
View and Understanding the Smart Room Sensor Detail Screen. From the thermostat’s home screen, select the My Home option. Then select the wireless extender icon. This will display the details for that Smart Room Sensor.
Room Averaging using Occupancy Detection
The following two features can be set using either the thermostat or thermostat app using the system setting screen. From the home screen, go to Menu > Settings > Current Temperature.
The occupancy detection feature is built into every sensor. The settings are as follows:
Sensor Temperature Difference Limit
There is feature for temperature averaging that limits how much of a difference in temperature readings there can be by comparing any Smart Room Sensor detected temperature to the S40 thermostat detected temperature. By default, if the smart room sensor temperature reading difference is less or greater than 7ºF, it will be excluded from participating in temperature averaging. The message “Device is not participating as temperature readings are abnormally high/low” will appear at the bottom of the Smart Room Sensor Detail screen.
Verify that the sensor is not in direct sunlight, discharge vents, unconditioned space or any other types of environmental conditions that could affect the smart room sensor temperature reading.
NOTE: 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 smart room sensor may need to be replaced.
Adding and Removing the Lennox Wireless Extender
Please refer to the Smart Room Sensor Setup and Installation guide for information on the devices, placement and pairing using the Lennox Thermostat App to the S40 Smart Thermostat.
View and Understanding the Wireless Extender Detail Screen
From the thermostat’s home screen, select the My Home option. Then select the wireless extender icon. This will display the details for that wireless extender.
Wireless Signal strength indicators are illustrated as follows:
Status Indicator Light Color Descriptions
NOTE: Light is only on when there is an issue with signal strength.
Table 1. Sensor Light – Two Color Descriptions
| Function | Light Color | Description |
| Signal Strength | BLUE | • 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. |
| Pairing | GREEN | A flashing green light indicates the unit is in pairing mode. |
Adding and Removing the Smart Air Quality Monitor (SAQM)
This device can only be installed by your professional installer. A single S40 Smart Thermostat can support one Lennox Smart Air Quality Monitor.
How the Smart Air Quality Monitor Works
IMPORTANT The 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) in the home it will pass that information on to the thermostat which will attempt to clean the air. Depending on the IAQ equipment installed in the home, one of the following methods will be used by the thermostat:
Side Switch
The primary reason for this switch is to turn off the internal fan in case the device is installed in a bedroom. 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.
An alert code 70003 will be displayed indicating the switch is OFF. The alert code will automatically clear once the switch has been set back to the ON position.
While the switch is in the DOWN position, the latest reading from the SAQM will be displayed on the thermostat. It will not update that information until the switch is moved back to the UP position.
IMPORTANT The dealer and homeowner may receive an email indicating that Alert Code 70003 is a no cool, no heat condition. This is not true and the HVAC system will operate normally. This type of notification is due to alert code being classified as a Service Urgent.
Table 5. Terminology
| Term | Definition |
|
PM2.5 | PM stands for particulate matter (also called particle pollution), the term for a mixture of solid particles and liquid droplets found in the air you can breathe. The 2.5 is the fine inhalable particles, with the diameters that are generally 2.5 micrometers and smaller. Breathable air particles can include pet dander, bacteria, mode, chemicals form cleaning products, building materials, fuel-burning equipment such as furnaces, upholstered goods, cooking, sweeping, copy machines, skin flakes, clothing fibers, combustion, cooking, smoke, dust, dirt, spores, and pollen. Sources vary seasonally. |
|
VOC | Volatile organic compounds (VOC) are a combination of gases and odors released/emitted/off-gassed from a variety of sources. VOCs include a variety of chemicals, some of which may have a short- and long-term adverse health effects. Alternate terms are odors, gases, vapors and chemicals. |
| CO2 | CO2 or carbon dioxide is an odorless, colorless, non-flammable gas. Carbon dioxide is a by-product of combustion, as well as a result of the metabolic process in living organisms (for example, you remove it from your body via the lungs in exhaled air). |
| Term | Definition |
| BLE | BLE stands for Bluetooth Low Energy. BLE is a variation of the Bluetooth wireless standard designed for low power consumption. |
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.
When the system is cleaning the air an icon will be displayed on the home screen. There will also be a message listed under the Status screen.
On the Smart Air Quality Monitor detail screen, select Monitor Settings and then select Level of Indoor Air Cleanliness. Options are High, Medium and Basic (most economical).
The intend for these options is to allow the installing technician to fine-tune the thresholds telling apart Good and Fair air quality. If the technician selects the High option, this will result in the system triggering cleaning actions at lower levels of pollutants and contaminants.
NOTE: Only Volatile Organic Compounds (VOC) thresholds will be affected by these settings.
Likewise, Basic mode will trigger air cleaning at higher levels of VOC compared to Medium.
View Details and Postpone Cleaning Air
When the Lennox Smart Air Quality Monitor has determined that there is poor air quality in the home it will run the indoor unit fan or any other indoor air quality devices installed to clean the air. Selecting this notification on the thermostat home screen will allow you to view details concerning the air quality or postpone the air cleaning for a specified time period.
From the thermostat home screen select Cleaning Air and then you have the option to View Details and Postpone. Selecting postpone will display a screen where you can select 1, 2, 4, 8 and 24 hours.
The most current information provided by Lennox is available using the QR codes listed on the QuickStart Guides or product packaging.
Apple, the Apple logo, iPhone and iPad are trademarks of Apple Inc. registered in the US and other countries.
Android is a trademark of Google Inc. Use of this trademark is subject to Google permission. Amazon, Echo, Alexa and all related logos are trademarks of Amazon.com, Inc. or its affiliates.
IMPORTANT For any of these third party applications to work with your thermostat, the thermostat MUST be connected to the Internet and you MUST be logged into your Lennox Thermostat account.
Amazon Alexa
Download the Amazon Alexa app from Google Play or the App Store™ on a compatible phone or tablet. Then follow the on-screen stops to finish setup.
Once you have added the thermostat to your Amazon Alexa app, then you can use Siri® to voice control.
Changing to Celsius
Using your Amazon Alexa mobile app, select the three bar icon in the upper left-hand of the screen.
Alexa will control your thermostat a bit differently when in Heat / Cool mode. In Heat / Cool mode the system can automatically switch between heating and cooling as needed.
For instance, if you ask Alexa to set the hallway temperature to 70 degrees, your thermostat will use this as a midpoint temperature, setting the Heat set point to 69 and Cool set point to 72. Alexa will confirm your request, saying “Hallway is in auto mode, aiming for 70 degrees”.
NOTE:
Additional Help
Amazon’s on-line help at https://alexa.amazon.com.
Google Home and Assistant
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. Once you have added the thermostat to your Google Home app, then install and enable the Google Assistant app (Android and IOS) to enable voice control.
NOTE: Google Assistant app may be already installed on your Android device.
Perfect Temp and Schedule Mode Functions
Raising or lowering the temperature is not supported when using a schedule or Perfect Temp feature. When attempting to change the temperature when in either reference mode, Google Assistant will respond with “mode not supported“.
Heat / Cool Mode (Auto-Changeover)
Although Google Assistant supports heat / cool mode temperature adjustments, it will do so only by maintaining the currently established temperature ranged. For example, if you set your heat set point to 60ºF and your cooling set point to 80ºF at the thermostat itself, then you have established a temperature range of 20 degrees. Any adjustment using Google Assistant, either through the app or by voice will maintain a 20 degree range differential as well. Let’s say you change your heat set point to 65ºF. Now your thermostat will indicate the heating is at 65ºF and cooling is set at 85ºF.
Adjusting the cooling set point will result in the range being maintained as well. In the Google Home app, the thermostat image will only display the approximate center temperature between the current heating and cooling set points. In this example it would display 75ºF.
Additional Help
Google’s Online help at https://support.google.com/googlenest/gethelp.
Control4® Smart Home | Operating System
Control4 is a leading control and automation platform which works with thousands of smart devices integrating audio, video, lighting, security, intercom, and climate control into a seamless customer experience
Control4 gives the customer an easy-to-use interface to control any Lennox Smart Thermostat.
Settings include:
BUILDING36 PRACTICAL HOME AUTOMATION
Building36 is a leading control and automation company that delivers next-generation smart home solutions which work with thousands of smart devices, integrating control for HVAC, water, video, lighting/appliance and security into one location.
Building36 gives the customer an easy-to-use interface via the Building36 Dashboard or the Building36 Home Mobile App to control the Lennox’ S40 thermostat.
Settings include:
To expand a specification notification to access a more detailed description of the alert code, press the down arrow.
|
Alert Priority |
Alert Priority Description n | Notifications Displayed or Email Notifications Sent | ||||||
| Displayed for Homeowner on Thermostat | Displayed for Dealer on Thermostat | Lennox® S40 Smart Thermostat Application | Lennox® Smart Technician Service Application** | LennoxPros Service Dashboard** | Homeowner Emailed* | Dealer Emailed | ||
| Service Urgent | Your system is in a No Heat/ No Cool or not operating. Dealer service call is needed to get the system running. | √ | √ | √ | √ | √ | √ | √ |
| Service Soon / Service Urgent | This alert priority indicates that the system will likely recover on its own and no interaction is necessary. Typically, either after a specific timer period or a specific number of instances, some Service Soon alerts will escalate to Service Urgent. |
X |
√ |
X |
√ |
√ |
X |
X |
| Service Soon | System is not reaching set point or is partially operating. A Dealer will need to service it with 24-48 hours. | X | √ | X | √ | √ | X | X |
| Maintenance | Maintenance alerts are those intervals you put in the thermostat as reminders to change filters, replace UV lamps, tune up systems. |
√ |
X |
√ |
X |
√ |
X |
X |
| Information Only-Dealer | This alert priority is for information and is directed to the dealer. | X | √ | X | √ | X | X | X |
| * For homeowner to receive email notifications, email updates has to be enabled. From the home screen, go to menu > user account > Email updates and set to ON. ** For dealers to receive service alerts and service alert emails the feature needs to be enabled by the homeowner. From the home screen, go to menu > user account > Dealer Email updates and set to ON. | ||||||||
FCC Compliance Statement — PART 15.19
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
FCC Interference Statement — PART 15.105 (B)
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. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:
RF Exposure Information
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:
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Download Manual
Lennox S40 Smart Thermostat User Guide
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