Description
The Trane BRD04878 Dual Relay Output Board is a control module used to manage multiple electrical switching operations within heating and cooling equipment. It operates by converting low-voltage input signals into relay actions that regulate connected components such as fans, compressors, and auxiliary loads. In modern HVAC systems used in commercial and industrial applications, it is configured inside control panels of air-handling units and packaged units to coordinate sequential operations. The board is mounted within the electrical enclosure and wired to the main controller for signal communication. It improves operational accuracy, supports system coordination, reduces control errors, and ensures stable performance during continuous duty cycles.
