Lennox 47L19 Limit Switch 320074-702 ensuring the HVAC secondary heat

ensuring the HVAC secondary heat exchanger or primary bundle maintains consistent pressure switch ratings and airflow performance under high-fire conditions

utilizing a standard 48 frame housing for seamless installation

and temperature offsets to fine-tune loop response

High Flow Capacity: The 3/4" orifice ensures minimal pressure drop across the valve

the Nordyne 669856R provides a precise fit for B4VM

Lennox 47L19 Limit Switch 320074-702 ensuring the HVAC secondary heatThe Lennox 47L19 Limit Switch is a critical OEM replacement part designed for precise thermal regulation in residential and commercial furnaces. As an auto reset limit switch, this 36T series disc style component operates on a normally closed circuit, ensuring the burner assembly remains functional only within safe operating parameters. When the internal plenum temperature reaches the 185F high limit threshold, the switch opens, breaking the circuit