The City is seeking a Design/Build firm (“Firm") to provide full design and turn-key installation of residential HVAC split systems at the Bryan Fire Station #2. The existing system comprises of approximately fifteen (15) air handling (AH) units, ranging from 400 CFM to 1,500 CFM, with eleven (11) vertical fan- coil units, three (3) wall-mounted units, and one (1) ceiling cassette. The AHs are connected to two (2) outdoor condensing units (“ODU”). The systems are as described on the original Construction Documents dated June 13, 2016 and shall be provided as reference to the selected Firm. Equipment selection is required to be from industry-leading manufacturers with extensive background of providing quality products. A list of manufacturers that may be considered includes, but is not limited to, Carrier, Daiken, Ecoer, and Mitsubishi. The specified equipment will be required to meet current industry standard refrigerants and all components readily available at local supply stores. The new system design shall include gas-fired furnaces. With the incorporation of gas fired-furnaces, extensive electrical upgrades for the facility is not anticipated. Two (2) dedicated outdoor air systems (“DOAS”) are requested to precondition makeup air to both the Fire Marshal’s Office and Fire Operations side of the facility. The DOAS units may be gas-fired. All new refrigerant line sets will be required throughout. The Firm shall calculate the heating, ventilating, and air conditioning (HVAC) loads with the anticipation of 35-40 tons being required. Soft-start kits for units and upgraded media air filters are requested by the City. The design shall be based on an indoor temperature of 68 degrees, ambient outside temperature of 105 degrees, and relative humidity maintained at 55%. The design shall incorporate the ability to monitor the system remotely. Equipment should be highly redundant such that each split system is stand alone, and failure of one component will not affect the other systems. Parts and repair procedures for the residential DX split system equipment design shall be non-proprietary and available from numerous sources. Local service contractors should have full capability to repair or replace equipment specified in the design. No other system designs (i.e., chilled-water, Variable Refrigerant Flow, electric heat, etc.) are to be considered. Design should anticipate utilizing the existing ductwork as much as possible. Should the Firm determine that any portion of the duct work is not adequate for the anticipated design, the City will need to approve any demolition and reconfiguration. Demolition to any section of ductwork is anticipated at duct plenums and connections to the new units will need to be remade to support revised configurations. New ductwork shall be like-kind (sheet metal). Plumbing modifications will involve routing a larger medium-pressure gas line to the mechanical rooms with service drops to each new furnace and DOAS units. A large outdoor concrete pad(s) will be required to accommodate multiple ODUs. Placement of the pad must include aesthetics consideration.
