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Lacquer sheets stacked — description and returns below the cascade board.
(Water Column) set point
or the control board displaying three flashes for a "failed open" switch
it utilizes a 2-10VDC control signal to deliver precise proportional positioning
This is an SPST control that opens the circuit on temperature drop and closes on temperature rise
Trane BRD4570 Control Board 320819-301 (Water Column) set pointThe Trane BRD4570 is a high performance Tracer VV550 VAV controller designed specifically for precision air distribution and multi zone climate management. Engineered to replace legacy Tracer VV550 units, this direct replacement VAV board ensures seamless integration with Trane building automation systems using the LonTalk communication protocol. Operating on standard 24VAC power input, the Trane BRD4570 HVAC control board manages dampt actuator