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Primary Pumps Location: Directly connected to the chillers themselves. Purpose: Circulate chilled water through the chiller's evaporator, where heat from the building is absorbed, and then back to the chillers. Flow Rate: Often designed with a constant flow rate to ensure the chillers operate at their optimal efficiency. Types: Can be dedicated (one pump per chiller) or headered (multiple pumps serving multiple chillers). Secondary Pumps Location: Part of the separate chilled water distribution loop to the building. Purpose: Distribute the chilled water from the primary loop out to the various air handling units, fan coil units, or other cooling equipment throughout the building. Flow Rate: Designed with variable speed drives (VFDs) to precisely adjust flow as cooling demand in the building changes. Control: Operate based on a differential pressure setpoint within the distribution loop, ensuring that there's a consistent supply of chilled water at the needed locations. Two way valve and Three way valve detailed explanation. • Two Way Valve and Three Way Valve Detailed...