Trane BRD4874 Board 321894-706 This helps verify the functionality

This helps verify the functionality of the 24V AC reversing valve signal and ensures the outdoor fan cycles off correctly during the defrost sequence

making it ideal for low-pressure solenoid valve applications

Whether you are performing a seasonal overhaul or a critical breakdown repair

While the S21535 is a widely used Aaon HVAC part

Field technicians often source the Lennox 97L01 to resolve furnace limit switch tripping issues or diagnostic codes related to primary limit circuit faults

Trane BRD4874 Board 321894-706 This helps verify the functionalityThe Trane BRD4874 Dual Hi Voltage Binary Input Board (MPN: BRD4874, also identified as X13650734060) is a critical interface module for Trane chiller controls, specifically engineered for Tracer CH530 and Tracer TD7 automation platforms. This OEM board acts as a precise signal translator, converting high voltage binary inputs from external field devicessuch as pressure switches and safety relaysinto digital data the HVAC control module can process.