ECB2-70-H006 Chilled Water Flow Control Diagram_R.pdf

This document is a technical schematic and operational diagram for a chilled water flow control system. The drawing depicts a secondary chilled water system with six identical control valve units arranged in parallel configuration, each featuring temperature and pressure sensing capabilities, control mechanisms, and associated piping connections. The system includes a utility tunnel and pump room section shown in the upper right portion of the diagram.

The document provides a detailed sequence of operation outlining the system's functional requirements and control logic. Key operational parameters include chilled water supply and return line management, differential pressure control across sensor transmitters, secondary water return temperature regulation, and automatic switchover protocols between primary and secondary systems based on temperature thresholds and system pressure conditions. The system incorporates multiple safety features including isolation valves, check valves, strainers, and relief mechanisms. A secondary chilled water system curve graph is included in the lower right, illustrating flow rate performance characteristics across various differential pressure conditions, with flow capacity ranging from approximately 2,000 to 14,000 GPM. The legend identifies various component types including temperature sensors, pressure switches, isolation valves, check valves, and flow control devices used throughout the system design.