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While the S21535 is a widely used Aaon HVAC part
it features a 1/2 inch bore and a clockwise rotation (viewed from the hub end)
Built with a durable brass body and stainless steel power element
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 While the S21535 is aThe 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.
