When should the RCW-42 be used over a standard RC-4264 core

ensure the torsion arms are seated correctly within the blower housing to prevent housing resonance or airflow restrictions

This is the transformer only

Dual Secondary Output: Configurable for 115V or 230V systems

Johnson Controls V47AR-2 Regulating Valve Els PW 17895 When should the RCW-42 beThe Johnson Controls V47AR 2 is a heavy duty, direct acting temperature actuated water regulating valve designed for precision thermal management in demanding industrial and commercial HVACR applications. Built with a rugged cast iron body and a 1 1 2" ASME flange connection, this valve is engineered to modulate the flow of cooling water or glycol to maintain setpoint stability in heat exchangers, internal combustion engines, and large scale air