Lennox 47K19 Defrost Sensor

The Lennox 47K19 Defrost Sensor is a critical OEM replacement part designed for high-performance heat pump maintenance. Engineered for residential and commercial HVAC applications, this defrost tube thermostat monitors the temperature of the outdoor evaporator coil to prevent excessive ice accumulation. The 47K19 features a precise tube mount design that ensures accurate thermal feedback, initiating the defrost cycle by closing at 32° F and terminating the process by opening at 55° F. This HVAC sensor is essential for sustaining the efficiency of Lennox CHP and PHP series units during cold weather operations. As a veteran-grade HVACR component, the 47K19 is identical to 47K1901 and serves as a direct 36327B006 cross-reference. Integrating this genuine Lennox part eliminates the risk of system failures caused by frozen coils and reduces unnecessary compressor strain, ensuring reliable reverse cycle heating performance in demanding environments.

Key Benefits

• Universal Compatibility: Fully interchangeable with 47K1901 and 36327B006 for seamless field replacement.
• Precise Calibration: Factory-set parameters of 32° F (close) and 55° F (open) optimize defrost cycle timing and energy consumption.
• Industrial Durability: Robust construction specifically built to handle the vibration and moisture typical of condensing units.
• Enhanced Efficiency: Prevents heat pump freeze-ups, maintaining consistent airflow and heat transfer across the coil.

Common Questions

• How can I tell if my 47K19 sensor is failing? If the outdoor coil is encased in thick ice or the system remains in defrost mode for more than 15 minutes, the sensor may be out of calibration or experiencing a short.
• Is this sensor compatible with 3/8" tubing? Yes, this defrost tube thermostat is specifically designed to clip onto 3/8" diameter copper tubing for direct temperature sensing.
• Will this part work if my model calls for part 47K1901? Absolutely. The 47K19 and 47K1901 are the exact same component with identical specifications.

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.