Selective Demolition: • Remove existing rooftop HVAC units, interior AHU components, supply/return duct- work, piping, controls, and associated electrical feeders. • Remove portions of acoustic ceilings, soffits, roof curbs, pads, and exterior metal panels as needed for new work. Mechanical: • Furnish and install new packaged rooftop equipment, ductwork, hydronic and condensate piping, insulation, dampers, fire-stopping at penetrations, vibration/seismic supports, equipment pads, and automatic DDC controls. • Provide testing, adjusting, and balancing (TAB) of new and existing systems. Existing HVAC System Cleaning: • Clean, disinfect, and verify existing supply/return ductwork and plenums scheduled to remain. Coatings and Protection: • Apply factory/field anticorrosion coatings to new coils, circuitry, and exposed HVAC metals as specified. Electrical: • Provide new feeders, branch circuits, disconnects, VFDs, panel modifications, grounding, and lighting revisions required for HVAC equipment and ceiling work. Architectural: • Patch and trim new duct penetrations through the exterior soffit; install new exterior lou- ver/trim assemblies. • Remove and reinstall acoustical panel ceilings disturbed by mechanical/electrical work; replace damaged components. Commissioning and Closeout: • Start-up, testing, and TAB of all new HVAC systems. • Provide demonstration and training for Owner staff. • Deliver O&M manuals and record documents.
