Technicians should look for a humming motor with no shaft movement

This valve is designed to handle duty cycles up to 600 psi

Operating it at 120V will lead to torque failure and potential coil damage

the EP2121S is the manufacturer-designated direct replacement for the EP2121S1

'NO PP' stands for No Pre-Purge

Johnson Controls VG1245CNH943GGA Valve Assembly 321894-709 Technicians should look for aThe Johnson Controls VG1245CNH943GGA is a high performance 1" 2 way normally closed ball valve assembly engineered for precise proportional control in demanding HVACR environments. Built with a rugged forged brass body and a 300 series stainless steel ball and stem, this assembly is designed to handle hot water, chilled water, and 50% glycol solutions. The stainless steel trim ensures compatibility with 15 psig saturated steam, providing superior