Replacement of Chillers at Adult Detention Center, Leesburg, VA

This Project consists of improvements to the HVAC system at the Loudoun County Adult Detention Center located at 42035 Loudoun Center Place, Leesburg, Virginia 20177. The HVAC improvements consist of the replacement of two existing air-cooled chillers located at grade. The new chillers shall be installed on the existing concrete pads with manufacturer-provided support rail curbs and reconnection to the existing chilled water system distribution piping and electrical connections. The existing distribution pumps and Variable Frequency Drives will also be replaced. A new glycol feed tank system shall be provided for the chilled water distribution system and the chilled water loop shall be filled with a thirty-percent (30%) propylene glycol solution. The equipment start-up and testing shall be performed by the factory authorized service agency. All exterior chilled water piping insulation shall be removed and replaced. All exterior piping shall be heat traced. New control sensors and devices shall be provided for the new equipment and shall be integrated with the Siemens building control system. The existing electrical system shall be reused for connection of the replacement chillers and pumps to the existing distribution equipment. The Project shall be performed in multiple phases in order to maintain an operational chilled water loop to the greatest extent possible, with the requirement to provide a temporary roll-up chiller as the existing chillers are being replaced. The system would need to be offline only for the draining and refilling of the glycol solution. Q&A due by 5pm, 8/17/21. Bonds required.