Lochinvar & A.O. Smith 100208493 Board 320734-701 Common Questions: Which valve models

Common Questions: Which valve models are compatible with the ASCO 304-361

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

the 322676-701 harness is engineered to withstand the thermal stress and vibration common in rooftop environments

the element is likely cracked or degraded and requires replacement

Lochinvar & A.O. Smith 100208493 Board 320734-701 Common Questions: Which valve modelsThe 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.