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Arden Hills City Hall Mechanical Assessment 22020 <br /> <br />6 | Page <br /> <br /> <br />3. ACCU-3 is a Trane TTA120, 10 Ton air cooled condensing unit, serving AHU-3. <br />VVentilation Systems <br />The building is served by (3) Trane M-Series Modular air handling units. Each AHU consists of a supply <br />fan, DX cooling coil, hot water heating coil, filter section, air blender and return air mixing box. <br />1. The main city administration area is served by AHU-1, Trace model MCCA017. Overall, the unit <br />is in good condition with no rust or corrosion on the exterior or interior casing. The heating coil <br />and supply fan were also in good condition. The DX cooling coil appeared to have a fair amount <br />of buildup from condensate draining off it over the years.