this specific 10k or 12k ohm-style immersion probe is utilized for both the inlet and outlet headers to monitor the temperature delta across the heat exchanger

the EF33CW180 offers a direct-fit solution for models like the 58CTA and 312AAV series

Universal Compatibility: The interchangeable hub design means one blade can fit multiple motor shaft diameters

and LB-107228T

A failed or tripped 1320547 limit switch often forces the blower into a continuous "on" state as a safety measure to dissipate excess heat

Johnson Controls VG2231VM292NGGA Valve Assembly 30067439-890 this specific 10k or 12kThe Johnson Controls VG2231VM292NGGA is a heavy duty 4 inch 2 way normally open flanged globe valve designed for precise flow control in demanding hydronic systems. Built with a rugged cast iron body and durable brass trim, this assembly handles high capacity chilled or hot water applications with a 150 Cv rating. The ANSI Class 125 flat faced flange connection ensures a secure fit for industrial piping. Performance is driven by a tandem mount spring