42 - Attachment 0004 SEED PROJ SOW 1991 ENL BRKS PH 4 MCH RM PLN SCT 041827.pdf

This is a technical schematic and control system flow diagram for a U.S. Army facility's heating, ventilation, and air conditioning (HVAC) system. The document, prepared by the Corps of Engineers, illustrates the interconnected control systems for multiple building components including dual-team operation, circulator pumps, fan coil units, air handling units (AHU-B-1 or B-2), make-up air units (MAU-B-1 or B-2), and heat recovery system controls. The diagram depicts operational sequences for water supply circuits, temperature regulation, and automated valve positioning with detailed narrative descriptions of operating procedures for each system component.

The schematic specifies control logic and operational thresholds for various system elements, including instructions for dual-pump operation with changeover mechanisms, fan coil unit modulation based on temperature setpoints, and heat recovery system functionality. The controls are designed to manage water distribution, heating/cooling cycles, and air handling to maintain facility temperature regulation. Technical annotations throughout the diagram reference specific valve positions, temperature set points, pump operation parameters, and interlock sequences necessary for coordinated system operation. The document includes a system flow diagram legend and references to multiple control sub-systems, all integrated to support the overall HVAC operation for the Barracks Building identified in the title block.