Lochinvar & A.O. Smith 100109978 Ignitor Assembly 321042-401 units at higher elevations may

units at higher elevations may require an additional de-rating kit to ensure proper gas-to-air ratios

This gas burner for HVAC is typically rated for Natural Gas but can be utilized in LP configurations provided the correct OEM conversion orifices are installed during the HVAC service

This Permanent Split Capacitor (PSC) motor operates on 208-230V single-phase power and draws 1

this part number specifically includes the 24V solenoid coil required for electronic actuation

Lochinvar & A.O. Smith 100109978 Ignitor Assembly 321042-401 units at higher elevations mayThe Lochinvar & A. O. Smith 100109978 Ignitor Assembly is a mission critical OEM component designed for precise ignition and flame rectification in high efficiency commercial gas water heaters and boilers. As a genuine 100109978 replacement part, this assembly integrates a high durability igniter element and flame sensor, a common configuration in the A. O. Smith BTN Series and various Lochinvar heating systems. For technicians out in the field, this