the Lennox 46K91 HVAC heat exchanger is essential for restoring AFUE ratings and preventing premature inducer motor failure or limit switch tripping caused by airflow restriction or blockages

ensuring system stability and precise load tracking in proportional terminal unit configurations

What are the diagnostic codes for this board

protecting the internal components from moisture

Compatibility: Direct replacement for part numbers 36M22

Carrier 331709-759 Valve Kit 320074-702 the Lennox 46K91 HVAC heatThe Carrier 331709 759 Expansion Valve Kit is a critical OEM replacement part designed for precision refrigerant metering in residential and light commercial cooling systems. This Thermostatic Expansion Valve (TXV) is engineered specifically for R 410A systems with a capacity range of 1. 5 to 2. 5 tons. As a direct successor, it functions as the factory authorized replacement for legacy part numbers 331709 761 and EA36YD085, ensuring seamless