Lennox 74N47 HSI Ignitor 30067439-890 High Isolation Efficiency: Engineered as

High Isolation Efficiency: Engineered as a Class 2 power source to isolate the low-voltage control loop from the 120V primary feed

Optimal Drainage: Engineered with internal pitching to facilitate moisture removal and prevent standing water

this sensor utilizes a glazed alumina ceramic insulator to maintain high dielectric strength and electrical integrity in environments reaching temperatures up to 2100°F

this is the official replacement limit switch for several generations of the Defender series

the 117U5043 is specifically calibrated for SC model compressors

Lennox 74N47 HSI Ignitor 30067439-890 High Isolation Efficiency: Engineered asThe Lennox 74N47 HSI Ignitor is a high performance, OEM grade hot surface ignitor specifically engineered for precision ignition in Lennox gas furnaces and condensing water boilers, including GWB9 series models. As a veteran technician knows, maintaining reliable combustion starts with a fast acting 120V element. This silicon carbide ignitor provides the necessary thermal mass to reach ignition temperatures rapidly, ensuring the gas valve opens to a