Lochinvar & A.O. Smith 100109978 Ignitor Assembly 320735-701 ensuring identical footprint and wiring

ensuring identical footprint and wiring logic

and PCB board integration

Contractors should note that CNT3457 is frequently superseded by CNT03457

verify local codes and appliance specifications before substituting

measure the signal wire (white/green) to ground

Lochinvar & A.O. Smith 100109978 Ignitor Assembly 320735-701 ensuring identical footprint and wiringThe 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