Frequent tripping often indicates a mechanical issue within the compressor

ideally in a position that allows for oil return to the compressor and easy access for future core replacements

Featuring an angle body configuration with 1/4" x 1/2" SAE flare connections

specifically designed to match the static pressure requirements of your furnace or air handler

The orifice must be matched to the outdoor unit's capacity and manufacturer specifications to maintain balanced system pressures

Lochinvar & A.O. Smith 100208493 Board 318820-201 Frequent tripping often indicates aThe 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.