replacement is the industry-standard recommendation

Swivel joints

or visible "pitting" and carbon buildup on the physical toggle terminals

The 7B switch provides a proportional 135-ohm signal for modulating feed water systems

simplifying furnace gas valve replacement in vertical or horizontal configurations

Lochinvar & A.O. Smith 100112636 Control Board 318172-701 replacement is the industry-standard recommendationThe Lochinvar & A. O. Smith 100112636 Control Board is a critical OEM replacement part designed for precision direct spark ignition (DSI) and intermittent pilot systems in commercial water heaters and boilers. This Fenwal ignition control operates on 24VAC 120VAC, 50 60Hz, utilizing advanced flame rectification technology to monitor burner performance and ensure safe startup cycles. As a veteran grade HVAC replacement board, the 100112636 features