The City of Grand Forks is seeking a qualified contractor to design, supply, and install a turnkey HVAC system modification to the main floor and Caisson at the Raw Water Intake Building located at 600 S 3rd St. including all required demolition, mechanical, and electrical installation work, and roofing work. The work shall also include any required subcontractors, system temperature controls, power and control wiring, painting, bond and insurance costs. Background: The existing main level and caisson heating, ventilation, and air conditioning (HVAC) system within the City’s Raw Water Intake building has become problematic requiring numerous expensive repairs to keep the system operational. Ongoing maintenance is no longer feasible to keep the system running efficiently. The City is looking to replace the HVAC system. Project Characteristics and Considerations: • Remove and discard existing air handling unit (AHU) which includes a condensing unit, dual duct furnace, and required existing ductwork, louvers and louver operators. • Any existing ductwork, including air intakes not used by the new system will be removed. • Install roof top units (RTUs) with adequate tonnage capacity. • Verify existing precast double tee roof load bearing capacity to accommodate any proposed roof penetrations and weight of proposed RTUs and related roof-mounted equipment and peripherals. • All roof mounted equipment and penetrations will be sealed properly in a way that is easily replaceable when the existing roof membrane is replaced. • The proposal will emphasize energy efficiency in an effort to reduce heating and cooling costs. • Reconfigure system with main floor and caisson on separate zones allowing heated and cooled independent of each other. • Provide an alternate for the City to consider replacement of existing controls. Proposed controls to be Trane Control System, SCADA driven and accessible online. • Installation to be complete by October 31, 2025.
