1. Outside Air Ventilation to Resident Bedroom Units and Second Floor Staff Offices and Activity/Lounge – Provide outside ventilation airflows to resident bedroom units and second floor staff office and activity/lounge areas through a dedicated outside air system (DOAS) with energy recovery. Existing exhaust fan(s) serving the resident unit toilet rooms, resident floor common bathrooms, and second floor staff office toilet rooms would be replaced with this scope. This DOAS unit should be located outside the building on grade. Exhaust air should be ducted from each resident unit toilet room, common bathroom, and staff office toilet room to the DOAS with outside supply air ducted back to each resident bedroom unit, staff office, activity/lounge space, and resident corridors. Supply and exhaust ductwork should penetrate the side of the building and run either exposed down the corridor or be located above the lay-in tile ACT ceilings. The DOAS unit should be a packaged gas-heat, electric cool unit controlled to precondition the supply air using energy recovery wheel and mechanical conditioning to provide space temperature and humidity control. Outside supply air should be discharged into each bedroom unit, staff office, activity/lounge area, and corridor through ceiling diffusers or wall/duct mounted grilles, and bathroom exhaust fans should be replaced with new ceiling exhaust air grilles. The existing supply air duct risers from the basement air handling unit to the resident corridors should be reconfigured to allow space in vertical chases for new duct risers. Basis of Scope Design = 1 DOAS @ 3,200 CFM supply/exhaust airflow, 12.5-ton cooling, and 300 MBH heating capacities. 2. Air Filter Replacement – Existing fibrous air filters in the basement air handling unit (2-inch depth) should be replaced with more efficient filters having a minimum MERV 13 rating. Basis of Scope Design = MERV 13 filters for 1 AHU. 3. HVAC System Control Modifications – Controls on air handling unit serving the basement areas and first floor lobby and activity/lounge should be modified and programmed to provide continuous fan operation any time the spaces are occupied. Space carbon dioxide sensors or occupancy sensors should be included to automatically reset minimum ventilation airflow rate for varying occupancy demands. Wi-Fi or local touchscreen interfaces should be included for easy user programming and system monitoring. Basis of Scope Design. = Control Modifications for 1 AHU
