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Summary of Contents for Lennox L40
- Page 1 Lennox L40 Smart Thermostat 508674-01 1/2025 Copyright 2025 Lennox Industries Inc. © Installation and Setup Guide Dallas, Texas, USA...
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Page 2: Table Of Contents
Service and Support - Service Access and Connecting Lennox L40 Smart Thermostat Wiring ...4 Remove Home ............26 Remote In ..............18 Lennox L40 Smart Thermostat - Exploded View ..5 Delete Account ............26 Notifications (Service and Alert Codes) ....19 Lennox L40 Smart Thermostat - Installation ....6 Restart Thermostat ............26... -
Page 3: Shipping And Packing List
Warranty certificate Lennox Home Application Additional Support ® Smart Applications The Lennox L40 Smart Thermostat is a residential, touch-screen, Energy Star certified wall unit. It offers features such as: • Wi-Fi • Bluetooth • Remote monitoring • Advanced Diagnostics (Remote-In) •... -
Page 4: Dimensions - Thermostat
System Wiring Diagrams 4-7/16 in. (25.4) (25.4) (112 mm) For system diagrams, see the included fold-out Lennox L40 Smart Thermostat Diagrams sheet. Connecting Lennox L40 Smart Thermostat Wiring Use “Table 2. Terminal Designations” on page 4 for connecting the BACK PLATE thermostat wiring to the back plate terminals. -
Page 5: Lennox L40 Smart Thermostat - Exploded View
Lennox L40 Smart Thermostat - Exploded View 1. LCD Module 7. Antenna 13. Product Label 2. Display Frame 8. Phillips Rounded Head Screw (2x) 14. Back Plate Terminal Box 3. PCB Assembly 9. Back Plate 4. Phillips Rounded Head Screw (4x) 10. -
Page 6: Lennox L40 Smart Thermostat - Installation
New Installation 1. Remove existing thermostat. The following procedure is for new installation or installing the Lennox L40 2. Note the wire colors and what terminals they are connected for future Smart Thermostat in a new location in an existing home. -
Page 7: Commissioning Using Lennox® Smart Tech
The Download App screen displays. The screen lists QR codes to scan and download Lennox Smart Tech from either App Store or Google Play. If the app is already installed, touch continue and proceed to step 6. -
Page 8: Configuration Screens
Screen Titles Selections or Status established between the thermostat and the app. NOTE: See “Table 4. Lennox Smart Tech App Configuration Screens” on page 8 for sequence of configuration. Configuration Screens The following table describes the screen sequence of configuration. - Page 9 Table 4. Lennox Smart Tech App Configuration Screens Table 4. Lennox Smart Tech App Configuration Screens Screen Titles Selections or Status Screen Titles Selections or Status Language • English • Español Add the dealer’s ID number, Dealer • Franҫais phone number, name, email, Information website, and address.
- Page 10 Dealer Service Center. Select to view system Notifications, Equipment » Settings, Information, Tests, Diagnostics and the Installation Report. When the service technician selects Exit Dealer Service Center, the Lennox Smart Tech disconnects from the thermostat. Enter a name for the HVAC...
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Page 11: Lennox L40 Smart Thermostat - Setup
Enter your dealer’s phone number. Lennox L40 Smart Thermostat - Setup b. Touch to return to the Dealer Information screen. NOTE: The setup process is completed in conjunction with the Lennox L40 5. Touch Smart Thermostat and the Lennox Home mobile app. -
Page 12: Wi-Fi Setup
NOTE: If you wish to see the characters you are typing, check show • Communication will not occur among the S30, L40, and S40 thermostats password. The thermostat will support up to a 63 character password. even if all thermostats are on the same network. -
Page 13: Wi-Fi Terminology
Whether connecting to a visible or hidden network, if successful, a check Received Signal Strength Indication (RSSI) mark will appear beside the Thermostat, Router, Internet, and Lennox Cloud The ideal signal strength range for the thermostat is -1 to -69 RSSI. The icons within the app. -
Page 14: Equipment Settings
Equipment Settings Table 6. Parameter Description Selections listed in this section are dependent on system hardware Parameter (In alphabetical Description configuration. Not all options listed in this section will be available. order) NOTE: When changing the default settings for any parameter, there is a Access and set up Balance Point Control via Internet Weather. - Page 15 This setting when enabled controls the temperature in the home Number of stages in thermostat is dependent on installed equipment. Smart Away when no one is home. For this to function, the Lennox Mobile app NOTE: Applicable to heat pumps in electric configurations when the needs to be installed on a mobile device.
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Page 16: Notifications
Notifications Installation Report Any active alert conditions will be listed in this section. Reminders will also be This section lists installer and customer information. In addition, the displayed on this screen as well. A list of already cleared notifications is also installation report indicates the installation date along with the current date, available. -
Page 17: Information
Smart Tech ® Users can enter or add the dealer ID or phone number. Once the system This feature allows the service technician to connect Lennox Smart Tech for ® is connected to the Internet, the remaining information is automatically servicing purposes. -
Page 18: Service And Support - Service Access And Remote In
From the thermostat home screen, go to Menu > Lennox Dealer Support Access > Local Lennox Dealer Info and verify that all fields are complete. Select Dealer Support Access and press the slide buttons to ON to enable Remote Sharing, Alerts and Notifications, and Advanced Diagnostics. -
Page 19: Notifications (Service And Alert Codes)
To expand a specification notification to access a more detail description of the alert code, press the down arrow to expand the description. Table 10. Alert Code Priority Condition Visibility Notifications Displayed or Email Notifications Sent Displayed for Displayed Lennox LennoxPros ® Alert Priority Alert Priority Description n... -
Page 20: Service Notification Alert Codes
Service Notification Alert Codes Table 1. Alert Codes and Troubleshooting Actual Displayed Alert Priority Text Under Alert Code Component or System Operational State and Troubleshooting Tip How to clear alert code Condition dealer control center > Notifications The thermostat is reading an indoor temperature that is higher than 90ºF (factory default). - Page 21 Table 1. Alert Codes and Troubleshooting Actual Displayed Alert Priority Text Under Alert Code Component or System Operational State and Troubleshooting Tip How to clear alert code Condition dealer control center > Notifications The HD display’s internal temperature sensor is not operating correctly. To resolve this issue, try the following: •...
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Page 22: Installation Checklist
Is the Wi-Fi connected? Has the homeowner downloaded the Lennox Thermostat application from either Google Play or IOS App Store to their mobile devices? Is the Lennox Dealer account number or your main shop phone number been added to the dealer information screen? This will tie the homeowners system to your LennoxPROS account. -
Page 23: Technical Support And Mobile App For Installers/Technicians Only
HVAC Professionals and businesses need in one place. From NOTE: Selecting a customer from the list or map pin will display the following: shopping for parts and supplies to using Lennox’ FREE e-tools, your needs are covered. Home System(s) »... -
Page 24: Home Systems
NOTE: Clicking on a card with an alert expands to display the Remote In than one system control (if enabled by the homeowner) and Troubleshoot (access to the Lennox Troubleshooting Center, which includes error code System History lookups and any available documentation). -
Page 25: Equipment Configuration Profile (Ecp)
The profile is removed from the Custom Profiles list. 2. Select the Custom Profiles tab (to build a completely new profile) or the Equipment Profiles Default Properties tab (to build a profile using a Lennox default profile) and click Create New Profile. Equipment profiles automatically download to Lennox Smart Tech after the ®... -
Page 26: Unregistering The Lennox L40 Smart Thermostat
Unregistering the Lennox L40 Smart Thermostat Delete Account The Lennox L40 Smart Thermostat is linked to a home profile in the (Lennox Home Application Only) ® homeowner’s account. Any action that impacts the home profile will impact all thermostats associated with that home profile. -
Page 27: Re-Configure System
Re-Configure System (Lennox Home) ® Navigate to: Menu > Advanced Settings > View Support Service Control Center > OK > Equipment Settings > Reset > Re-Configure System Table 16. Re-Configure System Parameter Description Account Not affected by restart Home Home profile is not affected Target Zoning, Air Flow, and Ventilation settings may be affected. -
Page 28: Installation
Index Temporary Advanced Diagnostics Access (Remote In Button) 24 Alert Code Priority Types and Notifications Options 19 Alert Codes and Troubleshooting 20 Mobile Applications 23 Commissioning New Installation 6 Using the Mobile Setup App 7 Common Practices 6 Received Signal Strength Indication (RSSI) 13 Re-Configure System 27 Delete Account 26 Remove Home 26...
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