Summary of Specifications:
Scope of Work Coordinate work schedule with Facilities Manager and Water Treatment staff. Remove existing HVAC system and dispose Connect new equipment to existing duct systems Work will require a building permit. Building permit fee is waived but contractor is responsible for all other fees that may apply. Final payment will not be processed until the final Building Safety inspections are complete and approved If the total weight of new equipment exceeds the total weight of existing equipment, Contractor is responsible to provide engineering and structural modifications as necessary to meet code. Install controls as specified Warranty minimums: One year warranty parts and labor on all installations, 10 year warranty on heat exchanger City of Louisville is tax exempt Installation schedule: Complete all work before July 31, 2015 Existing Equipment RTU-1 Location: rooftop System: Hastings modular duct system consisting of an evaporative cooling, blower, two burners and one down plenum. Existing Model number: Hastings RHVB-500-V, SN44651 Natural Gas Input BTU: 500,000, two burner sections 250,000 BTU input each with a modulating gas valve, 75,000 minimum input 480V, 3 phase Equipment Specification General • Approved manufacturers: Hastings, Greenheck, Engineered Air, Trane, Captiveaire (others may be considered with pre-approval) • Contractor will be responsible for all duct connections and/or curb adapter modifications • Filters: pleated filters provided with installation • Outside air intakes will be hooded and have an approved bird screen Equipment Specification RTU-1 • Sizing: capacities equal or exceeds original • System modular duct system consisting of mixed air (economizer), blower, burner(s) and a down plenum • Indirect gas fired burner efficiency: 80% AFUE or better • Modulating gas burner: required • VFD or two speed blower motor – preferred • Mixing box/economizer: required • Hinged access doors: preferred Controls • Heating controlled by sensors with adjustable setpoint • HV1(unoccupied heating, intermittent fan): 0-30% (adj.) outdoor air, heating enabled • HV2 (occupied heating, continuous fan): 0-30% (adj.) outdoor air, heating enabled/automatic • EC1 (purge): 100% outside air, heating disabled, interlocked with exhaust fan • EC2 (economizer cooling): 50-100% outside air, heating disabled, when inside temp exceeds adjustable setpoint (75F) and outside air is below adjustable temperature (65F), interlocked with exhaust fan • Control display will show which operating mode is selected. • Control display will show the indoor temperature and setpoints • Controls will activate exhaust fan(s) in HV3 and HV4 modes Scope of work by owner, if required Dedicated GFI convenience receptacle, not on furnace circuit Electrical upgrades required by code .Alternates Alternate #1: Provide pricing for energy efficiency upgrades (high efficiency motor, modulating burner, etc.) Alternate #2: Contractor to provide all required electrical work with permit RFP Submittals by Contractors Base bid pricing Alternate pricing Product information sheets for proposed systems, including controls City of Louisville Decision Criteria Price Quality and features of equipment Schedule Energy efficiency Completeness of proposal, including equipment specifications and supporting documentation
