Replace Pool Dehumidification Unit (PDU) and Air-Cooled Condenser
AGENCY: U.S. Department of the Navy
LOCATION: Naval Station Newport, Rhode Island
SIZE: $656,893
PRIME: AACON General Contractors
AWARD DATE: June 2023
COMPLETED: October 2023
AACON General Contractors served as the prime contractor for the replacement of a large custom Pool Dehumidification Unit (PDU) and Air-Cooled Condenser (ACC) at Naval Station Newport in Rhode Island. This project highlights AACON’s expertise in executing complex mechanical renovations within active federal facilities, requiring precision integration of new systems with existing ductwork, piping, and controls infrastructure. The effort demonstrated direct experience with HVAC and environmental control systems of comparable scope and complexity to air handling unit (AHU) replacements, such as those defined under Solicitation 1232SA25R0013.
The project involved complete demolition and replacement of the rooftop PDU and ACC at Building 1109. The new custom dehumidification system featured 100% outdoor air capability, DX cooling, hot gas reheat, and hot water heating — providing precise humidity and temperature regulation for the facility’s pool area. AACON managed all phases of execution, including submittals, rigging, electrical and mechanical tie-ins, controls integration, and final commissioning. Work was performed under strict coordination with the Navy to ensure safe utility shutdowns, secure site access, and continuous protection of surrounding occupied areas.
AACON executed a turnkey installation effort that included procurement, delivery, and rigging of the new PDU and ACC, along with installation of refrigeration piping, control valves, sensors, and associated electrical components. The system was fully integrated with the existing Johnson Controls BACnet Direct Digital Control (DDC) network, enhancing automation and monitoring capabilities. All new roof curbs, mechanical supports, and insulation were installed to meet applicable federal and manufacturer specifications.
Following start-up, discrepancies in factory controls and environmental conditions impacted performance. AACON responded swiftly by collaborating with the Government and manufacturer under contract modification P0001 to perform advanced diagnostics and troubleshooting. The team verified control sequences, adjusted sensor feedback, and optimized the system’s operation — successfully resolving performance issues without delaying project turnover. This proactive, solutions-driven approach underscores AACON’s capability to deliver technically demanding mechanical projects in sensitive, operational federal environments.
