Douglas County Ionwave #CI-2026-0141 Addendum 2

Willa Cather Library HVAC Replacement and Electrical Modernization

The City of Omaha is seeking a contractor to replace the HVAC system and modernize electrical systems at Willa Cather Library. - Government buyer: City of Omaha, Public Works Department; procurement through Douglas County Purchasing, with Facilities Management involved in site coordination. The Economic Sustainability Program is administered by the City’s Human Rights and Relations Department. - Main scope: Replace the library’s boiler, AHU-1, condensing unit(s), hydronic piping, and ductwork; modernize the panelboard and provide required equipment circuits and disconnects. Drawings identify one Daikin AHU, one Daikin condensing unit, one Riello boiler, associated pumps and coils, and exhaust equipment. - OEMs and named manufacturers: Daikin (AHU and condensing unit); Riello (boiler shown in drawings) and Lochinvar (prior-approved boiler manufacturer); Spirotherm, JL Wingert, Taco, and Greenheck (equipment shown in drawings). Other named manufacturers include Nexus, American Wheatley, John Wood Co., Wessels, and B&G for hydronic components, plus Lithonia, Metalux, Columbia, Sure-Lites, and Dual-Lite for lighting products referenced in schedules. - Notable requirements: Boiler alternatives must provide N+1 redundancy; boiler specifications include at least 96.1% thermal efficiency and BACnet integration. Listed and approved polypropylene vent piping is allowed as an alternative to specified CPVC or AL29-4C stainless steel. Project-affected above-grade supply ductwork requires cleaning; below-floor return duct cleaning is excluded by the clarification. Below-grade return ductwork containing asbestos must be preserved, and service must be maintained to areas outside the work scope. - Alternates and services: An alternate covers capping the existing boiler flue and routing a new flue and combustion-air duct through a new chase with floor cutouts. Other specified services include HVAC testing and balancing, controls commissioning and training, equipment demonstration, and one year of water-treatment maintenance. Documents conflict on below-floor return duct cleaning and a variable-frequency controller; confirm these items against the final contract documents. The initial scope states the existing motor starter remains and no new VFD is required. - Business and workforce requirement: An Economic Sustainability Program plan is required, including small-business participation and workforce-development commitments; qualifying apprentice use may earn an incentive.

Description

The City of Omaha is seeking bids for a complete HVAC system replacement and electrical modernization at Willa Cather Library in Omaha, Nebraska. Mechanical work includes a new heating boiler, AHU-1, exterior condensing units, hydronic piping, and updated ductwork; electrical work includes a modernized panelboard, equipment circuits, and disconnects. An Economic Sustainability Plan and verification of a City of Omaha Mechanical Contractor's License are required at bid time. Apprentice utilization is optional, and the project has no SEB reserve.

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