1. Introdução
The Lennox S40 Smart Thermostat is designed to provide precise control over your home's heating, ventilation, and air conditioning (HVAC) system. This advanced thermostat integrates with Lennox communicating products to automatically configure and optimize your system for enhanced comfort, performance, and energy efficiency.
Key features include a user-friendly touchscreen display, programmable schedules, geo-fencing capabilities, remote access via the Lennox Smart app, and compatibility with smart home ecosystems like Alexa and Google Assistant. The S40 also supports advanced accessories such as the Smart Room Sensor, Air Quality Monitor, and Wireless Extender to create a comprehensive home comfort solution.

Figure 1: Lennox S40 Smart Thermostat
The Lennox S40 Smart Thermostat features a sleek design with a large, intuitive touchscreen display for easy interaction and system management.
2. Configuração e instalação
Proper installation is crucial for the optimal performance and warranty validity of your Lennox S40 Smart Thermostat. It is strongly recommended to hire a certified HVAC installer for installation. Failure to use a professional HVAC installer may void the product warranty.
2.1 Compatibilidade
- Compatível com a maioria dos fornos, condicionadores de ar, unidades de tratamento de ar e bombas de calor de 24 VCA (até 3 stages de calor e 2 stages of cooling).
- Designed for Lennox communicating HVAC equipment.
- Supports conventional HVAC systems with the optional Equipment Interface Module (EIM).
- Requires 4-wire standard thermostat wiring. Use shielded thermostat cable to prevent noise interference.
2.2 Etapas de Instalação (Instalação Profissional Recomendada)
- Montagem: Secure the provided wall plate using the mounting kit (screws, anchors).
- Fiação: Connect the 4-wire standard thermostat wiring to the appropriate terminals on the wall plate.
- Thermostat Attachment: Attach the S40 thermostat to the mounted wall plate.
- Configuração inicial: Use the Lennox Smart Technician app for quick system configuration. The app assists with model and serial number recognition for hassle-free setup.
- Conexão de rede: Connect the thermostat to your home Wi-Fi network for remote access and smart features.

Figure 2: Lennox S40 Smart Thermostat with dimensions (2.5"D x 7"W x 4.5"H)
Ensure adequate space for installation, considering the thermostat's dimensions.
3. Operando seu termostato
The Lennox S40 features a 7-inch high-definition capacitive touchscreen display (1280 x 800 resolution, 16:9 screen ratio, 72dpi) for intuitive control of your home comfort system.
3.1 Interface de tela sensível ao toque
Navigate through menus and adjust settings directly on the touchscreen. The interface displays current temperature, humidity, system status, and weather information.

Figure 3: Annotated Lennox S40 Thermostat Display
This image highlights key areas of the S40 display, including time and date, menu access, temperature adjustments, system status, indoor humidity, and weather data.
3.2 Recursos inteligentes
- Vários horários: Create and customize various heating and cooling schedules to match your daily routine.
- One-Touch Away Mode: Quickly activate an energy-saving "Away" setting with a single touch.
- Smart Away (Geo-Fencing): Utilizes geo-fencing technology to automatically adjust temperature settings based on your proximity to home, optimizing energy usage.
- Weather-On-Demand: Access live weather data and a seven-day forecast directly from the thermostat screen.
- Smart Zoning System (iHarmony): If equipped with a Smart Zoning System, the S40 allows for whole-home zoning control, managing comfort in different areas of your home.
- Smart Room Sensor Integration: Enhance temperature balance across rooms by integrating Smart Room Sensors.
- Smart Air Quality Monitor Integration: Detects air pollutants and triggers air cleaning on demand when connected to a Lennox Smart Air Quality Monitor.
- Extensor sem fio: The Lennox Wireless Extender can nearly double the connection coverage area for your communicating equipment, ensuring reliable operation.
3.3 Acesso remoto e controle por voz
- Lennox Smart App: Control your thermostat remotely from anywhere using the Lennox Smart app on your smartphone or tablet.
- Assistentes de voz: The S40 is compatible with Amazon Alexa and Google Assistant for convenient voice control.
4. Manutenção
The Lennox S40 Smart Thermostat helps you maintain your HVAC system's efficiency and longevity through various alerts and diagnostic tools.
- System Warnings and Maintenance Alerts: The intuitive interface displays alerts for system issues or routine maintenance reminders (e.g., filter changes).
- Run Tests: Perform diagnostic tests on the complete system or individual components directly from the thermostat.
- Service Dashboard: Real-time monitoring of installed smart systems is available through the Service Dashboard, providing insights into operational parameters.
- Remote Diagnostics Sharing: If your system goes out of tune, the S40 can automatically alert you and allow you to remotely share diagnostic information with your local Lennox dealer for efficient service.
- Air Quality Management: When paired with a Smart Air Quality Monitor, the system can trigger air cleaning cycles based on detected pollutants. Fan options can also be configured to ensure minimum air circulation for improved air quality.
5. Solução De Problemas
If you encounter issues with your Lennox S40 Smart Thermostat, refer to the following common troubleshooting tips. For complex problems, contact a certified HVAC professional.
- Sem energia/Tela em branco:
- Check your circuit breaker for the HVAC system.
- Ensure the thermostat is properly seated on its wall plate.
- Verify 24VAC power supply to the thermostat.
- Leituras de temperatura incorretas:
- Certifique-se de que o termostato não esteja exposto à luz solar direta, correntes de ar ou fontes de calor.
- If using Smart Room Sensors, verify they are placed correctly and communicating with the S40.
- Problemas de conectividade Wi-Fi:
- Certifique-se de que sua rede Wi-Fi doméstica esteja ativa e dentro do alcance.
- Restart your Wi-Fi router and the thermostat.
- Verify correct Wi-Fi password entry during setup.
- Consider using a Lennox Wireless Extender if signal strength is weak.
- System Not Responding to Settings:
- Check system status messages on the thermostat display.
- Ensure the system mode (Heat, Cool, Auto, Off) is correctly selected.
- If connected to a communicating Lennox system, verify all components are powered and communicating.
- Problemas com o brilho da tela:
- Adjust screen brightness settings in the thermostat's menu.
- If automatic brightness is enabled, try disabling it and setting a manual level.
For further assistance, the Lennox Smart Technician app can provide diagnostic information, or you can contact your local Lennox dealer.
6. Especificações
| Recurso | Detalhe |
|---|---|
| Marca | Lennox |
| Nome do modelo | Lennox S40 (22V24) |
| Dimensões do produto | 2.5"P x 7"L x 4.5"A |
| Tipo de controlador | Amazon Alexa, Apple HomeKit, Control4, Google Assistente |
| Características especiais | Troca automática de modo de operação, controle de ventilador, indicador de filtro, tecnologia de geofencing, programável |
| Cor | Preto |
| Usos específicos | Ar condicionado, aquecedor, bomba de calor |
| Tipo de controle de temperatura | Aquecimento, Resfriamento |
| Tecnologia de Conectividade | Wi-fi |
| Componentes incluídos | 7" HD Display with 4-wire Connection, Mounting Kit (Screws, Anchors), Wall Plate |
| Fonte de energia | 24 V CA |
| Volumetage | 22 Volts (Nominal 24V AC) |
| Tipo de exibição | LCD, tela sensível ao toque capacitiva |
| Tamanho da tela | 7 polegadas |
| Resolução da tela | 1280 x 800 |
| Método de controle | Aplicativo, Controle Remoto, Toque |
| Tipo de montagem | Montagem na parede |
| Luz de fundo | Sim |
| Peso do item | 1.68 libras |
7. Informações de garantia
The Lennox S40 Smart Thermostat comes with a Garantia de 10 ano covering manufacturing defects or malfunctions.
Condição importante da garantia: To maintain the validity of this warranty, it is mandatory to have the thermostat installed by a certified HVAC installer. Installation by a non-professional HVAC installer may void the warranty. Products not professionally installed are also non-returnable and non-refundable.
Instructions for warranty registration are included in the product packaging.
8. Suporte e Contato
For technical support, service, or further inquiries regarding your Lennox S40 Smart Thermostat, please contact your local authorized Lennox dealer. They are equipped to provide expert assistance, diagnostics, and maintenance services for your system.
You can also utilize the Lennox Smart app for remote monitoring and to share diagnostic information with your dealer.
9. Recursos em vídeo
9.1 Lennox Smart Thermostat S40 (22V24) Overview
Vídeo 1: Oficial sobreview of the Lennox S40 Smart Thermostat, highlighting its features and benefits for home comfort and system control.





