Lennox 98P78 Hot Surface Ignitor Els PW 17895 Professional-grade Intermatic K4221C Control units

Professional-grade Intermatic K4221C Control units are the industry standard for reliable dusk-to-dawn lighting control

ensuring the blower assembly maintains sufficient airflow while preventing thermal stress on the heat exchanger

This sensor is a genuine Lennox HVAC part but is also used in equipment from Allied

Multi-Refrigerant Compatibility: Rated for 3 tons with R-22 and 2 tons with R-404A

critical for maintaining system pressure

Lennox 98P78 Hot Surface Ignitor Els PW 17895 Professional-grade Intermatic K4221C Control unitsThe Lennox 98P78 Hot Surface Ignitor is a critical OEM replacement component designed to ensure consistent glow ignition in residential gas furnaces. Also identified by the part number 98P7801, this 120V silicon carbide igniter is engineered for high temperature durability and rapid thermal response. As a ceramic block style Type B ignitor, it serves as a direct drop in for various Lennox HVAC systems, as well as specific compatible units from Rheem