Lochinvar & A.O. Smith 100277940 Board Freon the Trane COM11139 is the

the Trane COM11139 is the manufacturer-designated direct replacement for the COM7478

As a 3-phase unit

providing superior reliability in high-temperature and high-pressure HVACR environments

This is an "Open High" SPST switch

Three-Phase Stability: The 460V 3Ph configuration reduces current draw and electrical stress compared to single-phase alternatives

Lochinvar & A.O. Smith 100277940 Board Freon the Trane COM11139 is theThe Lochinvar & A. O. Smith 100277940 Board is a critical low voltage connection board engineered for precision signaling in high efficiency heating systems. Specifically designed for the Knight KH055 285 fire tube boilers, this OEM replacement part serves as the central communication interface between the main controller and auxiliary system components. As a veteran technician knows, maintaining signal integrity in commercial water heating