Emerson Climate Technologies 789A-801A1 Hot Surface Ignitor

Product Description

The EMERSON CLIMATE TECHNOLOGIES 789A-801A1 is a 120-volt silicon nitride hot surface ignitor designed as a direct OEM replacement for residential gas furnace applications. Silicon nitride construction delivers faster warm-up times and greater resistance to thermal shock compared to traditional silicon carbide igniters. Lead wires feature white high-temperature Teflon coating rated to 250 degrees C, and the ignitor ships with OEM-spec lead length and connector configuration to simplify swap-out. The assembly measures 1.26 inches by 0.75 inches by 12.01 inches and weighs 0.19 pounds. Licensed HVAC technicians are the typical installers for this component.

This ignitor is designed for use in residential gas furnace systems requiring a 120-volt hot surface ignition circuit. It serves as a direct replacement in systems originally equipped with a silicon nitride ignitor. Specific compatible Lennox part numbers include 70W16 and LB-112237B, making it a verified fit for Lennox furnace applications where those OEM parts were originally installed. The OEM-matched connector and lead dimensions allow for a fast, like-for-like installation without wire modification.

Key Features

• Silicon nitride construction for improved thermal shock resistance versus silicon carbide
• 120-volt operating voltage matches OEM ignition circuit requirements
• White high-temperature Teflon-coated lead wires rated to 250 degrees C
• OEM-spec lead length, dimensions, and connectors for direct plug-in replacement
• Compact profile: 1.26 inches by 0.75 inches by 12.01 inches

Compatibility

Direct OEM replacement for Lennox applications. Replaces Lennox part numbers 70W16 and LB-112237B.

Installation Notes

Installation should be performed by a licensed HVAC technician. Always shut off power to the furnace at the disconnect and allow the ignitor to cool completely before handling, as silicon nitride igniters are fragile and susceptible to cracking from oils or physical contact on the element. Do not touch the ignitor element with bare hands. Work should comply with applicable local mechanical and electrical codes.