Danfoss 003Z1333 Valve 323613-751 protecting against system freeze-ups or

protecting against system freeze-ups or stagnation

This is common in residential and light commercial units to power crankcase heaters

preventing costly water damage to the customer's property

a full replacement with this OEM 324645-701 is required

using the genuine 1946976 is recommended to ensure the specific internal pilot logic and port configuration match the factory control boards

Danfoss 003Z1333 Valve 323613-751 protecting against system freeze-ups orThe Danfoss 003Z1333 is a high performance Pressure Independent Control Valve (PICV) from the AB QM series, specifically engineered for 3 4" hydronic piping systems. This valve eliminates the need for complex Cv calculations by integrating a differential pressure controller directly into the assembly, ensuring 100% valve authority regardless of system pressure fluctuations. Designed with a robust CW 617N brass body, it handles an adjustable flow range