1.03 PROJECT DESCRIPTION / SCOPE OF WORK A. The project is fundamentally replacement of the existing closed circuit cooling tower and piping on the roof of South Windsor High School at 161 Nevers Road in South Windsor, CT. Also included is replacement of the system pumps and addition of other equipment, some system specialties, pipe replacement and supporting work. 1. The cooling tower supports a water source heat pump system that serves the school’s library, administration offices, arts wing and social studies wing. Total of around 45 water source heat pumps. 2. The main condenser water (CW) pumps, P-3 & P-4 will also be replaced. 3. The system heat exchanger tube bundle will also be replaced. 4. The project also includes replacement of portions of the CW piping, valves and specialties in the boiler room. 5. Also included is replacement of all of the condenser water system glycol fluid throughout the building including flushing and venting of the distribution system. B. The project will be contracted and performed as a single Contract with one Contractor acting as the General Contractor and all subcontractors engaged by that Contractor. Where the term “Contractor” is used hereafter, it shall refer to the main Contractor acting as a General Contractor. C. The contract will be turnkey, complete with all required specified equipment, materials, specialties, rigging, hoisting, roof repair, steel dunnage refinishing, electrical work and other work scope as identified in This Section and on the Drawings and Specifications. D. Refer to Work By Others section for work performed by Owner’s contracted Controls Vendor. E. Cooling Tower Replacement work shall include the following: 1. Drain existing glycol fluid from CW system. Intent is to flush and replace all system fluids in the equipment and distribution piping. Include complete draining, refilling with clean water, flushing and circulating water to clean the system and refilling and venting with new glycol solution. Coordinate work with pump replacement in Boiler Room. 2. Remove existing cooling tower on roof, including all required crane and rigging work, disconnect and remove all 4” CW piping on roof, cold water makeup connections, drain and overflow piping and sump water treatment system. Disconnect and make safe electrical power and controls wiring. Dispose of all removed equipment, materials and debris off site. 3. Clean existing steel dunnage framing on roof and repaint. Prepare for installation of new cooling tower. Verify adequacy and dimensions of existing anchor bolting. Reconfigure anchoring as may be required. 4. Rig and install new cooling tower. Furnish and install new condenser water piping on roof as indicated. Provide all required cold water makeup connections, drain and overflow piping and replace basin water blowdown equipment. Reconnect power wiring and control wiring. 5. Rebuild / repair existing rooftop pitch box where CW piping and electrical conduits penetrate roof. 6. Reconnect existing and new power. Contact and coordinate controls work with SNE / Invensys. F. Pump Replacement work in Boiler Room shall include the following: 1. Disconnect existing condenser water piping from the pumps above the pump isolation valves. (After draining the CW system.) 2. Disconnect power wiring and make safe. Remove existing pump starters. Remove the two existing pumps P-3 & P-4 and all suction diffusers, valves, fittings and gauges. Return one, newer CW pump to Owner to keep as on-site spare. 3. Furnish and install two new condenser water pumps (P-3 & P-4) in similar configuration. Provide new piping, valves, fittings and specialties as indicated and specified. Grout new pumps into existing concrete pad. Provide new motor starters. Align, test, balance and make operational. 4. Replace existing inner tube bundle in existing hot water heat exchanger. Existing HX shell to remain. Replace existing isolation, balancing valves, controls and specialties and near piping and fittings at heat exchanger. Adjust balancing valves to indicated flow rates for HX flow and Bypass flow. 5. Remove existing manual glycol fill drum, pump and piping. Dispose of off site. 6. Furnish and install new automatic glycol fill unit, connect to CW piping system and fill tank with full charge of pre-mixed glycol solution. 7. Replace additional boiler room condense
