Lochinvar & A.O. Smith 100167824 Control Board 30067439-890 such as the VA-7000 or

such as the VA-7000 or VA-4233 series

high-capacity safety relief valve engineered for ASME Section I steam boiler applications

Using it on an NC body will lead to improper seating and mechanical failure of the plunger

this TP-851 control board allows for straightforward HVAC troubleshooting by simplifying the diagnostic path for ignition failure

maintaining the precise tolerances required for the pressure switch to close consistently

Lochinvar & A.O. Smith 100167824 Control Board 30067439-890 such as the VA-7000 orThe Lochinvar & A. O. Smith 100167824 Control Board is a critical integrated component designed for high efficiency Knight XL heating boilers, specifically the KBN501 series. As a direct replacement for the obsolete RLY30066, this OEM control board manages essential system parameters including hot surface ignition, flame sensing, and temperature regulation. It ensures precise HVAC system timing and safety protocols by monitoring the air pressure