041823RURMH - SMITHFIELD HIGH SCHOOL - MECHANICAL ROOFTOP HVAC REPLACEMENT

The proposed upgrade consists of replacing eleven (10) packaged rooftop units and two air cooled condensers and duct coils. The roof top units are serving classrooms and office spaces.  The two air cooled condensers are serving the auditorium.  The existing HVAC equipment were installed in 2002 and are 20 years old.  The life expectancy of the equipment is 15-20 years.  All the equipment has reached their life expectancy.  The new roof top units will be replaced with same size and type of units.  The unit size ranges from 3-tons to 15-tons.  Sound attenuation will be provided by insulated the interior of the roof top unit curb and installation of new vibration isolation curb adapters.  The gas heat on the roof top unit will not be utilized. The existing heating hot water duct coils will be utilized for the source of heat.  New controllers and thermostat shall be installed.  Roof top unit(s) with hot gas reheat for a dehumidification cycle.  The new units shall be capable of removing moisture in the air during normal humid days down to 60% relative humidity.  Existing roof mounted condensing unit, refrigerant piping, and duct coil shall be removed and  
disposed of. Existing structural support shall remain in place and re-used. New supplemental may need to be added and shall be designed and specified by the design team.  New vibration isolators shall be installed at each unit.   Provide and install new condenser, refrigerant piping, and ductwork.  Existing ceilings shall be taken down temporary to remove and install equipment and re-installed once work is complete.  The existing controller and thermostat shall be replaced with new. New condenser, piping and duct coil shall be 30 tons each typical to Trane RAUC. Smithfield Public Schools has pre-purchased the specified units and is expecting delivery of equipment in 4 separate shipments. It will be the responsibility of the Contractor to receive and securely store equipment until it is prepared to install units. The successful bidder under this contract will assume full responsibility and costs involved in the hiring of any and all subcontractors necessary to the full completion of the work involved.