The Lennox 24K53 (507611-04) CS8500 Series Commercial Touchscreen Programmable Thermostat with CO2 sensing is designed for advanced comfort management and precise indoor air quality monitoring in commercial HVAC systems. Built to integrate seamlessly with Lennox premium equipment using the CORE Control System and Prodigy platforms, this thermostat delivers flexible scheduling, intuitive operation, and real-time environmental monitoring.

Featuring built-in temperature, humidity, and CO2 sensors, the 24K53 provides a comprehensive control solution that helps maintain optimal ventilation, comfort, and energy efficiency. With support for up to four stages of heating and cooling, intelligent recovery, automatic changeover, and scheduled occupancy modes, it is an ideal choice for modern commercial applications requiring both comfort and air quality oversight.

The full-color touchscreen interface offers simple navigation and customizable user access limits, helping prevent unintended adjustments in shared spaces. Installation and service are streamlined with four-wire compatibility for most applications, built-in diagnostics, and BACnet integration through CORE or Prodigy controls.

Specifications
Brand: Lennox
Catalog Number: 24K53
Model/Part Number: 507611-04
Family: CS8500
Type: Commercial Touchscreen Programmable Thermostat with CO2 Sensing
Wi-Fi Enabled: No Wi-Fi
Programs per Week: 7-Day
Changeover: Automatic
Intelligent Recovery: Yes
Stages: Conventional 4 Heat / 4 Cool
Screen Type: Full-color touchscreen
Product Height: 3.3125 in
Product Width: 4.3125 in
Product Depth: 0.875 in
Gross Weight: 0.6 lb

Key Features
• Integrated temperature, humidity, and CO2 sensing for enhanced indoor air quality
• Designed for Lennox Model L and Enlight RTUs with CORE Control, and Energence/Strategos RTUs with Prodigy
• Supports up to four heating and cooling stages and heat pump applications
• Full variable-speed operation when used with compatible equipment
• Automatic changeover between heating and cooling modes
• 7-day or 5/2 programmable scheduling
• Scheduled occupancy for ventilation control
• After-hours override via touchscreen or optional occupancy sensor
• Built-in equipment fault detection and diagnostics
• BACnet compatibility through CORE or Prodigy
• Four-wire installation for most applications
• Customizable display, user limits, and setpoint adjustments
• Screen lock to prevent unauthorized changes
• Performance reporting tracks heating and cooling hours