REBID Green Hill School Campus HVAC Improvements

In general, the scope includes: 1. Construction of a 4-pipe air to water CO2 heat pump plant and associated pumps, supporting equipment, and piping distribution to three housing buildings (Spruce, Hawthorn, and Maple). 2. Retrofit of 8 air handling units (4 each in the Hawthorn and Maple Buildings) with new supply and return fanwalls, hot water and chilled water coils, dampers, and filters. Construction must be phased for retrofit of 2 air handling units at a time, one building at a time. 3. New DDC system front located at the Central Plant Building Z with new DDC controls for the new central plant equipment. 4. New DDC controls Hawthorn and Maple Buildings consisting of a Building Level Controller and Controllers for the 4 air handling units in each building. Input/Output modules in the Building Level Controller shall be utilized for the existing exhaust fans (4 total per building), domestic hot water system in each building, and unit heaters (2 total per building). The Building Level Controller shall be utilized for the building entrance heating and chilled water pressure independent control valves, differential pressure sensors, and supply/return temperature sensors. 5. New Building Level Controller for the Spruce Building. The Building Level Controller shall be utilized for the building entrance heating and chilled water pressure independent control valves and differential pressure sensors. The supply/return temperature sensors will be provided as part of Bid Alternate 01. 6. Demolition of the existing 400 hp fire tube hot water boiler from the central plant Building Z. 7. Demolition of a portion of the Central Plant Building Z wall assembly and installation of a new roll-up service door and louvers in the same location. 8. Site distribution of buried chilled and heat water piping from the Central Plant Building Z to the CO2 heat pump located on a new concrete equipment pad on site and to the Spruce, Hawthorn, and Maple Buildings. 9. CMU block wall enclosure with fence and gate at the CO2 equipment pad. 10. Electrical upgrades to support the new mechanical equipment in the Hawthorn and Maple Buildings. 11. Electrical power for the Building Level Controller in the Spruce Building. 12. Alternates for Bid Alternate 01 and contract drawing and specifications for Bid Alternate 01 Scope of Work. Bid Alternate 01 is titled Spruce Living Unit HVAC Improvements. Mandatory 15% apprentice labor hours of the total labor hours are a requirement of the construction contract. Voluntary numerical Diverse Business goals of 10% MBE, 6% WBE, 5% SBE or PWSBE, and 5% Veterans have been established for this project. Achievement of the goals is encouraged.