"165" is the opening temperature (Fahrenheit) where the circuit breaks

effectively prohibiting pressure mixing between separate control loops

this unit optimizes refrigerant flow in both heating and cooling cycles without the need for external check valves

Precision Thermal Response: High-sensitivity NTC thermistor technology provides rapid feedback for tighter temperature regulation and improved modulation

Resideo VCZBB3600 Valve 318423-701 "165" is the opening temperatureThe Resideo VCZBB3600 is a high performance 1 2" NPT two way cartridge cage valve engineered for precision control in hydronic systems. Featuring a 1. 3 Cv flow coefficient and a modified equal percentage flow characteristic, this valve ensures stable temperature regulation for both chilled and hot water applications. Built with a rugged bronze body and a stainless steel stem, it is designed to withstand demanding environments, including systems