LENNOX S40 Smart Thermostat User Guide

LENNOX S40 Smart Thermostat

Features

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

Display Features

Specifications for the display are as followings:

• 7” Display Capacitive touchscreen display
• Screen resolution: 1280 x 800
• Screen ratio: 16:9
• Dots per inch: 72dpi

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.
• Ambient sensor – This sensor determines ambient light levels around
  the thermostat. If screen brightness is set to AUTO, the thermostat will automatically adjust screen brightness based on surrounding room light. To set to AUTO, go to Menu > Settings > Display and enable
• Auto Brightness Humidity sensor – This is the intake location for the built-in humidity sensor.
• Do not block the intake location. The indoor humidity percentage is displayed (enabled by default) on the home screen. The humidity percentage display on the home screen can be disabled by going to Menu > Setting > Display.
• Temperature sensor – This determines the room temperature.
• Reboot button – Using a paper clip, press and hold this button for approximately six (6) seconds to reboot the Thermostat. No settings are lost using this procedure.
• Micro USB connector with cover – For future use.

Comfort Features

• mart Away® mode brings Lennox innovation to energy savings by doing what regular programmable thermostats cannot. Rather than simply following a set schedule, Smart Away lets the Lennox S40 Smart Thermostat adapt to your life, perfectly. Smart Away works with the GPS in your family’s smartphones to detect when the house is empty. When it’s sure that nobody is home, it sets the temperature back to save energy. Then, when the Lennox S40 Smart Thermostat detects that someone is on the way home, it returns the system to normal operation so everyone always comes home to comfortable air.
• FEELS LIKE® brings Lennox innovation to comfort by optimizing and automating all the factors that affect how air feels. With the Lennox S40 Smart Thermostat, you simply set a single temperature that you want. The thermostat will then take into account all the factors that affect comfort, including heating, cooling and humidity, and create your ideal environment. It’s very similar to the way the “feels like” temperature on a weather report works.
• Allergen Defender brings Lennox innovation to cleaner air by monitoring the air quality and pollen levels in your zip code. When high levels of pollutants or allergens are reported, the Lennox S40 Smart Thermostat automatically increases fan speed to create more clean air per hour in your home.
• Climate IQ® – Monitors current climate conditions and automatically removes excess humidity when necessary (requires Lennox communicating outdoor unit).
• Schedule IQ – With this feature you only need to program the thermostat once. Whenever there’s a change in your routine, the thermostat adapts heating and cooling to match.
• Perfect Temperature (Single Set Point) – In non-zoning applications this allows a single temperature setting to be used to cool or heat the home.
• Supports air conditioning or heat pump units with up to four stages of heat / two stages of compressor operation (two stages of heat pump heating, two stages of auxiliary back-up heating and two stages of emergency heating).
• Variable – capacity / multiple – stage Heat  Cool, universal compatibility (gas/ electric/heat pump/air conditioner). When the S40 is used with the variable speed equipment homeowners can save up to 30% on their energy costs over single stage equipment and 15% over two stage equipment.
• Dual-fuel capable when using Lennox communicating heat pump unit with two balance points.
• Humidification measurement and dew point adjustment controls.
• Heat • Cool mode — Permits control of heating, cooling, humidification, and dehumidification without user involvement.
• Lennox® Smart Room Sensors for better temperature averaging throughout your home

Optional Accessories

• Lennox® Wireless Extenders can be used increase the range for your
• Lennox® Smart Room Sensors and Lennox® Smart Air Quality Monitor.
• Lennox® Smart Room Sensor. This sensor can be used for temperature averaging with up to a maximum of six (6) device.
• Lennox® Smart Air Quality Monitor. This device is an air quality monitor that provides alerts, recommendations, and triggers air purification on demand.
• It detects and tracks particulates, carbon dioxide and volatile organic compounds (TVOCs) inside the home. When poor quality air is detected, it triggers your system to cycle and clean the air, providing peace of mind that your family is breathing the most healthy, perfect air.
• PureAir™ and PureAir™S Air Purification Systems – Indoor air quality with time based notification of consumables including media filters, UVC bulbs, humidifier pads, and PureAir system catalyst service / replacement.
• Lennox® Smart Zoning with supports up to four zones.
• Humiditrol® Enhanced Dehumidification Accessory (EDA).
• ERV/HRV and fresh air dampers are supported when using an Lennox® Equipment Interface Module

Downloading Lennox Smart Applications

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

 

Connecting the Thermostat to the Home Wi-Fi

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

• This thermostat cannot connect to a home wireless router that uses more than 32 characters in the wireless access point name (visible or hidden).
• This thermostat will support up to a 63 character Wi-Fi password. Passwords cannot contain blank spaces or % symbol.
• If the home Wi-Fi connection is unsecured, then Wi-Fi security MUST be enabled. Consult your router documentation on how to enable Wi-Fi security
• This thermostat supports the following Wi-Fi security protocols: WEP, WPA, WPA2 and WPA3.
• Never use a home guest account.
• Always use a secure connection physically located in the home where the thermostat is located.
• Lennox S40 and S30 Smart Thermostats are not designed to communicate with each other even when on the same network.

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

• From the thermostat’s home screen, go to Menu > Settings > Wi-Fi.
• Slide the option to the ON position to enable Wi-Fi.
• Select Not Connected to display a list of available access points.
• Select your home Wi-Fi network.
• Enter the home Wi-Fi network password and select join to continue.
• NOTE: If you wish to see the characters you are typing, check show password.
• Verify the Thermostat Connectivity Status indicator appears  Thermostat Connectivity Status”. All connect icons will need to display green check marks across all connections.

Connecting to a Hidden Wi-Fi Access Point

• From the thermostat’s home screen, go to Menu > Settings > Wi-Fi.
• Slide the option to the ON position to enable Wi-Fi.
• Wi-Fi network indicator will show not connected. Select “not connected”.
• Scroll down and select other.
• The “enter new network information” screen will appear. Enter the name of the hidden network.
• Select your Wi-Fi access point Security. Options are: none, WEP, WPA, WPA2 and WPA3.
• Once a security type is selected, a password field will appear. Enter your Wi-Fi password to connect to your home Wi-Fi network.
• NOTE: If you wish to see the characters you are typing, check show password.
• Select join.
• Verify the Thermostat Connectivity Status indicator appears as illustrated in “Figure 2. Thermostat Connectivity Status”. All connect icons will need to display green check marks across all connection

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:

• Microwave ovens
• Wireless cameras
• Portable phones and bases
• Baby monitors
• Wireless speakers
• Bluetooth devices
• Garage door openers
• Neighbor’s wireless devices

Wi-Fi Terminology

• The following terminology is used in this troubleshooting section:
• Received Signal Strength Indication (RSSI). This indicates the signal strength of the Wi-Fi router being received by the scanning device (i.e., smart phone). So the higher the RSSI number (or less negative in some devices), the stronger the signal.
• Internet Protocol Address (IP address). This is an address assigned by your home router for each network device (e.g., computer, printer, thermostat). Received Signal Strength Indicator (RSSI)
• The RSSI can be viewed from the thermostat.
• From the home screen, select Menu > Settings > Wi-Fi > and select right arrow next to the Wi-Fi network name and then select it again.
• When selecting the right arrow (>) the second time, a screen will appearwhich will display an option to forget the network. In addition IP address, subnet mask, router IP, DNS, MAC Address, Speed, wireless type, BSSID and RSSI.

Creating an Account

Using the Thermostat

• Verify that the thermostat is connected to the home Wi-FI and that all indicators are green and check marked as illustrated in “Figure 2. Thermostat Connectivity Status” on page 6. From the home screen, go to Menu > Settings > Wi-Fi.
• From your thermostat’s home screen, go to Menu > User Account.
• Select Create New Account.
• Enter account details such as your first and last name, phone, email address, and password.
• Select whether you want to receive e-mail updates and reminders.
• Select allow your dealer to receive notifications (highly recommended
• Select agree to EULA.
• Enter your information and select Next. Enter your country/region, address, city, state, and zip code.
• Select Create Account.
• It is important that you provide your Lennox Home Comfort System
• Dealership remote sharing and Advanced Diagnostics and Troubleshooting (On / Always) options.

Using the Lennox Smart Thermostat App

• Download the Lennox Smart Thermostat App from either the Apple App Store or on 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 as illustrated in “Figure 2.
• Thermostat Connectivity Status” on page 6.
• Launch the Lennox Smart Thermostat app.
• Select Allow. This is required if you intend to upload a photo as a screensaver on the thermostat.
• On this screen select the Sign up option to create an account
• The next pop-up is asking to Allow Thermostat to access this device’s location. This is required if you intend to use the Smart Away feature to control your thermostat. Select While using the app
• If you plan to use the Smart Away feature, this select Settings > Location permissions. Select Allow all the time. Select the left arrow next to Location Permission to return to the previous screen.
• Complete all fields on the Sign Up screen. Also enable Email Updates and select the box that you agree to the Lennox EULA.
• Select the Sign Up button at the bottom of the screen. A pop-up screen will indicate that your account was successfully created. Select OK to continue.
• Now you will need to add your thermostat to your user account. First go your thermostat and from the home screen go to menu > user account and then near the bottom of the screen, select Generate pin. A five digit pin number will appear.
• Return to your mobile device and select the Plus sign on the screen. Then enter the 5 digit number displayed on the thermostat here. Then select Add.

Home Screen Details

Temperature Settings

• 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)

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

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

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. 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:

• If sensor is participating in temperature averaging.
• Humidity level in the room
• If the room is occupied or unoccupied.
• Battery percentage
• Wi-Fi connection strength

Lennox Smart Air Quality Monitor

• When selecting Monitor Settings the following options are available:
• Air Quality Monitor Name allows the user to rename the sensor using the virtual key board.
• Device Type will always show Monitor.
• 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)

Lennox Wireless Extender (BLE

• Selecting this icon will bring up the wireless strength indicator. There is an additional selection called Extender Settings. This screen includes:
• Extender Name: This will show the current name of the extender and can also be renamed from this screen.
• Device Type: Extender
• About Extender: This will list the model, serial number and firmware version

PureAir S

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:

• More Info: Information is listed here on the PureAir S product.
• Reminders: You can set service reminders here for 1 day, 1 week, 1 month, 3 months or custom.
• Service Contracts: This will list your service contact if it has been entered into the thermostat

Home and Status Screens Icon Descriptions

Menu

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.

General

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

• This section is only accessible if the thermostat has an active connection to Wi-Fi. On this screen you have the option to sign into an existing account or create a new account.
• Also available is the Generate Pin option if you are setting up your account using the Lennox Smart Thermostat App.
• Once the account has been created and thermostat added to that account, then information under this section can be edited at any time.
• Selecting User Account will take you to the User Settings screen. There you can select your Email (>) to view and edit information such as correct First and Last Name, Change Phone Number, Email and Password, View EULA and toggle on Email Updates and Monthly Report Email (System Performance Information).
• There is also a option to Move Out at the bottom of the User Settings screen.
• Selecting this option will remove the thermostat from your Lennox account.
• This would be done typically if your were selling your home or replacing the thermostat.

Display Settings

The available settings are:

• Auto Brightness with an option for either ON or OFF. When set to OFF, there is an adjustment bar to set the brightness level.
• Screen Lock with an option Unlocked, Partially Locked and Locked. Proximity Sensor which is ON by default. When set to ON, the display will automatically turn on when you approach it. When set to OFF, you will have to touch the screen for it to turn on.
• Screen Saver which by default is set to OFF. Options are OFF, Weather, Power Save (blank screen) and photo. Photo can be upload to the thermostat by using the Lennox S40 Smart Thermostat app

Lennox Dealer Support Access

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:

• Remote Sharing – Allow service provider to remotely view the status of your system. By default this option is set to OFF.
• Advanced Diagnostics and Troubleshooting
• » Off – You will not be give authorization to service provider to troubleshoot your system remotely.
• » On / Always -You will always give authorization to service provider to troubleshoot your system remotely

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

• No Schedule – System is not following a schedule. All changes are performed manually.
• Schedule IQ – This schedule operating in heat / cool mode and answering a few simple questions will allow the system to know how to set the temperature for the home based on time settings. By default there are two times and temperature settings which can be adjusted using the edit schedules option.
• At home day wake-up default time is 7:00am and low temperature setting of 67°F and high temperature setting of 80°F. Start time can be adjusted by press on the current time setting and can be adjusted as exampled
• » At home night sleep default time is 11:00PM and low temperature setting of 66°F and high temperature setting of 84°F.
• » Away – When away from home, Smart Away when enabled (see
• “Away” on page 12) is used to set the temperature while the home is unoccupied. Default low temperature setting of 62°F and high temperature setting of 85°F. Temperatures for any of the options above can be adjusted by sliding the low and high temperature circle left or right on the sliding scale.
• Summer – Provides the average Summer indoor cooling set points for home temperatures. Temperatures and time periods can be adjusted to provide your desired set points
• Spring/Fall – Provides the average Spring/Fall indoor cooling set points for home temperatures. Temperatures and time periods can be adjusted to provide your desired set points.
• Winter – Provides the average Winter indoor heating set points for home temperatures. Temperatures and time periods can be adjusted to provide your desired set points.
• Save Energy – Provides the recommended Energy Star set points recommended by the Environmental Protection Agency energy savings.

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
• NOTE: Profile labeled No Schedule cannot be renamed or edited. Profile Schedule IQ renaming is not allowed.

Settings

The system setting screen will allow the homeowner to connect to their home Wi-Fi router and give their system a name. 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:

• Lennox S40 Thermostat App continuously running on your mobile device (smart phone or tablet) and being logged in to your account.
• Requires Wi-Fi and location settings to be enabled on your mobile device. Android devices must also have the location mode set to “high accuracy.” Consult your mobile device user guide for instructions.

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:

• Away set points are 65ºF (18.5ºC) for heating and 85ºF (29.5ºC) for cooling.
• When the away fence is set to two miles for all participating mobile devices, and the closest participating mobile device is within the 0-2 mile (0 to 3.22 km) range of the home, the system is considered home.
  The system will use the set points from the schedule or what was manually set.
• If the closest participating mobile device moves into the 2.1 to 8 miles (3.40 to 13.04 km) range, the system is considered in transition, and the system will start to either increase or reduce the heating or cooling set point.
• Once all participating mobile devices have moved beyond the 8.1 mile (9.50 km) range from the house, the system sets the set points to the away set points (65ºF for heating and 85ºF for cooling).

Mobile Device Location Services

• Starting with Android versions 9 and 10, when allowing the Lennox Thermostat app access to device location you must select Allow all the time for the Smart Away feature to work correctly so go to Settings > Apps > Thermostat > Permissions > Locations and Allow all the time setting is enabled
• Starting with Android version 11, to ensure location services for the Lennox Smart Thermostat’s Smart Away feature are not auto disabled by Android operating system, go to:
  • Settings > Apps and Notifications > Select All Apps > Thermostat > Permissions and locate Remove permission if app isn’t used and ensure this setting is disabled.
  • Settings > Locations > Apps access to location > Thermostat and select Allow all the time.
• Starting with Android version 12, when you run the setup for the Lennox Thermostat App, you will be ask to enable permissions for precise location. Select the two options illustrated here.

Current Temperature

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.

 Using Smart Room Sensors
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

Fan

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.

• This option will only be available in non-zoning systems. This option allows the user to control both heating and cooling temperatures with one single temperature setting. Factory default is off (see the following figure for screen example).
• Select Heat Pump Mode: (only available with system using a heat pump). Options are normal and comfort. Default is normal. Descriptions for what each setting does is displayed on the screen

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.

• When the outdoor temperature is above the default high balance point of 50°F (10°C) (default), only the heat pump will be allowed to run (no auxiliary heat).
• When the outdoor temperature is below the default low balance point of 25°F (-4.0°C) (default), only the auxiliary heat is allowed to run (no mechanical heat pump operation).
• When the outdoor temperature is between the low and high balance point settings both heat sources are allowed to satisfy the heating demand.

Humidity

• 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
• Dehumidification Set Point Percentage — The slide bar adjustment tool allows desired humidity level in the home. Selection between 40% to 60% are available. Default is 55% when dehumidify is enabled Humidification Set Point Percentage- This adjustment tool is only visible when dew point is set to OFF. Range is 15% to 45% humidity. Default is 40%.
• Overcooling — This adjustment allows selection between 0°F to 4°F (0°C to -2°C). This adjustment is only available when Max or Climate IQ (Auto) is selected. This selection will limit how much overcooling is allowed when trying to achieve the dehumidification set point. Default is 2°F (1.0°C).
• Dew Point — This adjustment twill help reduce the amount condensation that may build up on windows and other glass surfaces. A dew point slider bar option will appear under the humidity menu. By default the dew point slider is set to OFF. When dew point is set to ON, the slide bar adjustment will appear with a range of -15% to 15%. Default is 0%.

Smart Zoning System

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 fulfill the demand from zone 1 until satisfied, or a maximum time of 20 minutes has occurred.
• If after 20 minutes the system is still operating based on satisfying the heating demand from zone 1, the system will terminate that demand.
• The system will then shut system down for five (5) minutes. This will allow for system temperatures and operating pressures to stabilize.
• After a five 5 minute delay the system will begin operations to satisfy the cooling demand from zone 2.
• 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

Equipment

PureAir™ S

• PureAir S is an air purification system that cleans the air in your home by addressing all three types of indoor air pollutants an:
• Airborne particles (like pollen, dust and pet dander)
• Germs and bacteria
• Chemical orders and vapors
• 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.

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

Lennox Smart Devices

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

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.

Occupancy Sensor Setting

The occupancy detection feature is built into every sensor. The settings are as follows:

• OFF – When the occupancy feature is turned OFF, the thermostat will always include the sensor in temperature averaging.
• ON – When the occupancy feature is turned ON, the thermostat will only include the sensor in temperature averaging if the room is occupied

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

Lennox Wireless Extender

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

Lennox Smart Air Quality Monitor

Status Indicator Light 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.

How the Smart Air Quality Monitor Works

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:

• If no IAQ equipment Installed – The thermostat will run the indoor unit blower to circulate the air.
• High Efficiency Filter – The thermostat will run the blower motor to circulate the air through the filter cabinet.
• Pure Air – The thermostat turns on system to run Pure Air to circulate the air through the Pure Air system
• ERV / HRV – The thermostat will check outdoor air quality and compare it to the indoor air quality. If outdoor air quality is better then it will bring in fresh outdoor air. If outdoor air is poorer it will run the indoor blower to circulate the indoor air

Definition of Contaminants

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.

Smart Air Quality Details Screen
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.

Indoor Level of Air Cleanliness Setting
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.

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

Third-Party Integration

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

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

• Select Settings.
• Choose your Amazon device.
• Select Measurement Units from the menu
• Toggle ON Temperature Units – Use metric measurements for temperature units.

Alert Code Priority Types and Notification Options

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

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:

• 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

RF Exposure Information
This device meets the FCC and ISED requirements for RF exposure in public or uncontrolled environments

Canada License-Exempt RSS Standard(s) Operation

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.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment

REFERENCE

DOWNLOAD MANUAL

Lennox S40 Smart Thermostat User Guide

LENNOX S40 Smart Thermostat User Guide