Lochinvar & A.O. Smith 100074348 PCB 318518-761 This OEM replacement transformer is

This OEM replacement transformer is manufactured to precise tolerances to maintain system impedance and protection levels

verifying the differential pressure with a manometer is recommended before replacing the high-limit safety switch

verifying the concave/convex blade orientation and hub placement is critical for compatibility

Key Benefits for Technicians OEM Precision: Genuine Reznor 201160 part ensures exact calibration for high altitude HVAC applications

immediately halting the heating cycle to prevent hazardous conditions

Lochinvar & A.O. Smith 100074348 PCB 318518-761 This OEM replacement transformer isThe Lochinvar & A. O. Smith 100074348 PCB is a critical OEM replacement control board designed for high efficiency tankless water heaters and select boiler models. Specifically engineered for 66J IN and 66J OS series units, this printed circuit board acts as the central intelligence for the system, regulating the ignition sequence, monitoring flame rectification, and processing data from integrated safety sensors. To ensure peak energy efficiency and