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it is compatible with an optional OS-100 kit if a physical outdoor reset is preferred
it typically requires a minimum pressure differential (usually 5 PSI) to function correctly and shift the diaphragm
Designed for the rigors of commercial and high-demand residential applications
How do I troubleshoot a failure to ramp up
the element is likely cracked or degraded and requires replacement
Lochinvar & A.O. Smith 100208493 Board 320734-701 it is compatible with anThe Lochinvar & A. O. Smith 100208493 Pump Relay Board is a critical OEM replacement component designed for high demand hydronic heating applications. Rated for 1. 5 HP pump motor control, this board serves as the primary switching interface between the boiler's integrated control logic and the external circulation pumps. It is specifically engineered for compatibility with Lochinvar Knight XL KB399 800 and FTXL series boilers, as well as several A.
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