the 400R is a steam primary low water cut-off

This specific model is a high pressure limit control designed to shut down the burner when the maximum safe system pressure is exceeded

Veteran techs will recognize this as the standard specification for various Heil

Built with a robust zinc-plated housing and a high-performance silicone diaphragm

Johnson Controls VG2231TL Valve Els PW 29614 the 400R is a steamThe Johnson Controls VG2231TL is a heavy duty, 2 way normally open globe valve engineered for precision flow control in commercial HVACR systems. Built with a rugged cast iron body and durable brass trim, this 2 1 2 inch valve is designed to handle hot water, chilled water, and 50% glycol solutions, as well as saturated steam up to 35 psig. It features an ANSI Class 125 flat faced flange connection and a 51 Cv flow coefficient, ensuring high capacity