Lennox 49K43 - (49K4301) Heat Pump Switch, Defrost
The Lennox 49K43 (49K4301) Defrost Switch is a high-quality, temperature-sensitive control device designed to optimize the defrost cycle of heat pump systems. As frost accumulates on the outdoor coil during low ambient conditions, this switch ensures that your system activates defrost mode at the right time to prevent performance degradation and protect vital components.
Key Features and Benefits:
- Accurate Temperature Activation
The 49K43 is factory-calibrated to respond to specific coil temperatures, initiating defrost only when necessary—this reduces energy consumption while ensuring system efficiency. - Improved System Reliability
Prevents coil icing that can lead to compressor strain, airflow restrictions, and long-term system damage. This switch safeguards the heat pump’s operation by maintaining optimal coil conditions. - Durable Construction
Built using high-grade materials for consistent performance under harsh outdoor conditions including moisture, freezing temperatures, and thermal cycling. - Direct OEM Replacement
Designed by Lennox for Lennox systems, guaranteeing a perfect fit, proper electrical characteristics, and full compatibility with OEM defrost control boards. - Wide Application
Suitable for a variety of Lennox heat pumps used in both residential and light commercial applications. - Fast and Secure Installation
Equipped with mounting hardware and standardized connections for straightforward service or retrofit by HVAC professionals.
- Part Number: 49K43
- Alternate Part Number: 49K4301
- Function: Defrost temperature switch
- Application: Outdoor coil frost detection for heat pumps
- Operating Temperature Range: Designed to trip at a precise temperature set point (exact set point may vary by model—refer to unit-specific service documentation)
Using a genuine Lennox OEM part like the 49K43 ensures compatibility, durability, and continued warranty compliance. It eliminates guesswork and performance risks associated with aftermarket alternatives.
Keep your heat pump running at peak efficiency all winter long. Order the Lennox 49K43 Defrost Switch today—available now at Beenimax.com.