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.
NOTE: The screen can also be activated by touching it.

• 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

• Smart 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.

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.

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

1. From the thermostat’s home screen, go to Menu > Settings > Wi-Fi.
2. Slide the option to the ON position to enable Wi-Fi.
3. Select Not Connected to display a list of available access points.
4. Select your home Wi-Fi network.
5. 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.
6. 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 connections.

Connecting to a Hidden Wi-Fi Access Point

1. From the thermostat’s home screen, go to Menu > Settings > Wi-Fi.
2. Slide the option to the ON position to enable Wi-Fi.
3. Wi-Fi network indicator will show not connected. Select “not connected”.
4. Scroll down and select other.
5. The “enter new network information” screen will appear. Enter the name of the hidden network.
6. Select your Wi-Fi access point Security. Options are: none, WEP, WPA, WPA2 and WPA3.
7. 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.
8. Select join.
9. 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

To eliminate a possible source of interference, temporally disable any devices and see if Wi-Fi performance has improved.

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.

1. 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.
2. When selecting the right arrow (>) the second time, a screen will appear which 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.NOTE: If the RSSI signal strength is anywhere between -9 to -69, then the signal strength is sufficient. If outside this range, then either relocate the router closer to the thermostat, add a repeater, or move the thermostat. Adjusting antenna on router or extender/repeater may resolve the issue.

Creating an Account

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

1. 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.
2. From your thermostat’s home screen, go to Menu > User Account.
3. Select Create New Account.
4. Enter account details such as your first and last name, phone, email address, and password.
5. Select whether you want to receive e-mail updates and reminders.
6. Select allow your dealer to receive notifications (highly recommended).
   IMPORTANT Please verify that your dealer has already added their account and contact information when they installed your thermostat. That information can be found at Menu > Lennox Dealer Support Access > Local Lennox Dealer Info. If this information is missing, please contact your local Lennox dealer and get the information you need to complete your dealer contact information.
7. Select agree to EULA.
8. Enter your information and select Next. Enter your country/region, address, city, state, and zip code.
9. Select Create Account.
10. 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
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.

1. Download the Lennox Smart Thermostat App from either the Apple App Store or on Google Play to your mobile device.
2. 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.
3. Launch the Lennox Smart Thermostat app.
4. Select Allow. This is required if you intend to upload a photo as a screensaver on the thermostat.
5. On this screen select the Sign up option to create an account.
6. 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.
7. 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.
8. Complete all fields on the Sign Up screen. Also enable Email Updates and select the box that you agree to the Lennox EULA.
9. 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.
10. 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.
11. 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.
12. The next screen will provide the option to Add New Home. Select that option.
13. Enter the home information required on this screen.
14. It is highly recommend by Lennox to check the option to allow dealers to receive service alerts and if possible remotely fix any issue that may occur with your thermostat. See “Home Screen Details” on page 11 for understanding why it is important to allow your Local Lennox Dealer access.
15. Select Done.
16. A screen will appear asking that you verify your home address. If everything is correct, select Done.

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)
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.

• Selecting any item on this screen will display the detail screen for that device.
• A yellow or red dot with an explanation point indicates there is an alert condition for that specific device.

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.

Lennox Smart Room Sensor

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:

• 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. See “Lennox Smart Devices” on page 32 for further details.

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:

• 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)

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:

• 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. For further details, see “Lennox Wireless Extender” on page 33.

PureAir S

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:

• 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

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.
1	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.

Feels Like is Active or Turning Feels Like on

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