Lennox 22V24 Smart Stat

The Lennox 22V24 S40 Smart Thermostat is a high-performance communicating HVAC control designed for precise 3HT/2CL system management. As a veteran-grade digital thermostat replacement for the legacy Lennox 19V30 and 10F81 models, the S40 eliminates the need for external gateways by utilizing a one-piece architecture that interfaces directly with Lennox communicating equipment. Its 7-inch HD touchscreen serves as a comprehensive command center, allowing technicians to access the Dealer Service Center for real-time HVAC diagnostics, including refrigerant pressure, compressor speed, and sensor calibration. This Wi-Fi enabled thermostat supports remote monitoring via the Lennox Smart Technician app, enabling advanced configuration of multi-stage heat pumps and furnaces. When paired with an Equipment Interface Module (EIM), the S40 can also regulate non-communicating 24VAC systems, ensuring maximum flexibility for residential retrofits and complex smart home integrations using the Matter standard or Control4.

Key Benefits for Technicians and Contractors

• Direct Compatibility: Engineered as the primary replacement for Lennox 10F81 and 19V30, ensuring seamless RSBus communication without hardware adapters.
• Advanced Diagnostics: Provides real-time performance monitoring of indoor and outdoor units, significantly reducing troubleshooting time during service calls.
• Flexible Control: Supports universal 3-heat/2-cool stages and integrates with PureAir S purification and iHarmony zoning systems.
• Precision Comfort: Features Feels Like technology to balance temperature and humidity, alongside Schedule IQ and geofencing for optimized energy efficiency.
• Streamlined Installation: Designed for 4-wire standard thermostat wiring (R, C, I+, I-) with a simplified sub-base mounting process.

Common Technical Questions

Is the 22V24 compatible with non-communicating systems?
Yes, by adding a Lennox 22X18 Equipment Interface Module (EIM), the S40 can control conventional 24VAC HVAC equipment, supporting up to 3 stages of heat and 2 stages of cooling.

Does this unit replace the S30 without changing the wiring?
The 22V24 is the direct upgrade path for the S30; however, unlike the S30, the S40 does not require a separate Smart Hub, so the remote hub must be bypassed to wire the display directly to the RSBus.

Can I add remote sensors to this thermostat?
Absolutely. The S40 supports Lennox Smart Room Sensors and Smart Air Quality Monitors, which are commissioned via the Smart Technician App for enhanced indoor air quality (IAQ) management.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.