Lennox 24K55 – 507611-04
Commercial Touchscreen Programmable Thermostat

The Lennox 24K55 (507611-04) CS8500 Commercial Touchscreen Programmable Thermostat is built for precise comfort management in commercial HVAC systems. Designed to operate seamlessly with Lennox premium equipment featuring the CORE and Prodigy control platforms, this thermostat offers intuitive operation, advanced diagnostics, and flexible scheduling options for efficient building control.

The full-color touchscreen interface provides simple navigation and can be customized to limit user access, making it ideal for commercial spaces. With support for up to four stages of heating and cooling, intelligent recovery, automatic changeover, and scheduled occupancy control, the CS8500 offers reliable, optimized performance in a wide range of building environments.

Installation is streamlined with four-wire compatibility for most applications. Built-in temperature and humidity sensors reduce the need for separate components, while ASHRAE, IECC, and FDD compliance ensures it meets modern commercial standards.

Specifications
Brand: Lennox
Catalog Number: 24K55
Model/Part Number: 507611-04
Family: CS8500
Type: Commercial Touchscreen Programmable Thermostat
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
• Compatible with Lennox Energence and Strategos RTUs featuring Prodigy Control
• Supports up to four heating and cooling stages
• Full variable-speed operation when used with matching equipment
• 7-day or 5/2 programmable scheduling
• Automatic heating/cooling changeover
• Scheduled occupancy for ventilation control
• After-hours override via touchscreen or optional occupancy sensor
• Equipment fault detection and diagnostics
• BACnet compatibility through Prodigy 2.0
• Built-in temperature and humidity sensors
• Four-wire installation for most applications
• Customizable display and adjustable setpoint limits
• Screen lock to prevent unauthorized changes
• Performance reports track heating and cooling hours