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This is a technical drawing showing a chilled water system schematic and control sequence for Building 1 at Peterson Air Force Base in Colorado Springs. The drawing (W-201-2) details the layout and components of a chilled water system including pumps, valves, sensors, and an expansion tank, along with associated part numbers and specifications listed in a bill of materials.

The drawing includes detailed sequence of operations for chiller control, secondary chilled water control, primary chilled water pump control, and flow metering systems. Key operational parameters are specified, such as temperature differentials, flow rates (500 GPM threshold), and control logic for the HVAC control CRT system. The system incorporates monitoring of chiller safeties, equipment status, and automated control sequences for starting/stopping chillers and pumps based on specific temperature and pressure conditions. The drawing appears to be part of a controls upgrade project, as indicated by the project title referencing "PAFB DSC8506 Replacement."