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

making it an essential component for residential heat pump systems requiring supplemental heat during defrost cycles or extreme ambient drops

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

While it provides the mounting locations for high-limit switches and igniters

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

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