Lennox 19L22 Return Air Temperature Sensor 20K Ohm NTC

The Lennox 19L22 is a duct-mounted return air temperature sensor designed for residential and light commercial HVAC systems. This sensor monitors the temperature of air returning to the heating and cooling system, providing critical data to the control board for precise climate regulation and optimal system performance.

Key Features:

• 20K ohm NTC non-linear thermistor for accurate temperature sensing
• 6-inch aluminum insertion probe for reliable duct mounting
• Operating temperature range of 45°F to 99°F (7°C to 37°C)
• Compatible with Lennox electronic control systems and Excel 10 Series controllers
• Mounts on flat duct or plenum surfaces with integral mounting flange
• Rugged 1/4-inch diameter aluminum probe construction
• Direct-wired connection for reliable signal transmission

This genuine Lennox sensor (cross-reference: Honeywell C7770A1006/U) is designed to work seamlessly with Lennox furnaces, air handlers, and HVAC control systems. The sensor provides accurate temperature feedback that enables the system to maintain consistent indoor comfort while optimizing energy efficiency.