Renovation of an educational facility in Plymouth, Massachusetts. Working plans call for the renovation of a educational facility.

Project has been cancelled Question Deadline 07/17/2026 at 4:00 PM ET Questions shall be submitted in writing to ablaisdell@plymouth.k12.ma.us and awilcox@plymouth.k12.ma.us. Replace an existing chiller (CH-1) at Plymouth South Middle School as specified in the available bid document. This document details the turnkey demolition of the existing chiller and the installation of a new air-cooled screw chiller (Johnson Controls / Quantech Model QTC40235, 225 tons nominal), including all associated mechanical, electrical, controls, rigging, commissioning, and warranty work required to provide a fully operational cooling system for the facility. 4.1 Demolition and Disposal of Existing Chiller 4.1.1 Safely isolate, lock out / tag out, and disconnect existing chiller (electrical, controls, chilled water piping, refrigerant systems). 4.1.2 Properly recover, recycle, and dispose of all existing refrigerant per EPA Section 608 by EPA-certified technicians; provide refrigerant recovery certification documents. 4.1.3 Drain, flush, and properly dispose of existing glycol/water from evaporator and associated piping. 4.1.4 Disconnect and remove existing electrical feeders, conduits, control wiring, and BAS connections back to the nearest serviceable point. 4.1.5 Rig and remove existing chiller from pad/roof; transport off-site and recycle/dispose per all federal, state, and local regulations. 4.1.6 Provide manifest documentation for all disposed materials. 4.1.7 Repair / patch existing pad, curb, or roof penetrations as required after removal. 4.2 New Chiller Furnish and Install 4.2.1 Furnish and install one ( 1) new Johnson Controls / Quantech Model QTC40235 air-cooled screw chiller as specified in Section 3.0. 4.2.2 Receive, inspect, and store equipment per manufacturer requirements. 4.2.3 Install chiller plumb and level on existing or new structural support (verify existing pad/curb capacity for 16,525 lb operating weight). 4.2.4 Install spring or neoprene vibration isolators per manufacturer recommendation. 4.2.5 Provide anti-vibration mounts (AVM) per AVM report. 4.2.6 Maintain manufacturer-required service clearances: o Side to wall: 6 feet (1828.8 mm) o Rear to wall: 6 feet (1828.8 mm) o Control panel to wall: 6 feet (1800 mm) o Top: NO obstructions allowed o Distance between adjacent units: 10 feet (3048 mm) 4.3 Refrigerant Piping and Charge 4.3.1 Chiller is factory-charged with R-513A refrigerant; verify charge upon delivery. 4.3.2 Top off refrigerant charge as required after startup. 4.3.3 Provide leak testing of all field refrigerant connections (if any). 4.3.4 Provide refrigerant in accordance with ASHRAE 15 and EPA Section 608. 4.3.5 Provide labeling per ASHRAE 34. 4.4 Chilled Water Piping 4.4.1 Connect new chiller to existing chilled water supply and return piping using 5-inch Victaulic grooved connections. 4.4.2 Furnish and install isolation valves, flexible connectors, strainers, pressure/temperature ports, drain valves, and air vents as required for proper service. 4.4.3 Provide pipe insulation matching existing system; minimum 1.5" closed-cell elastomeric with vapor barrier. 4.4.4 Flush, fill, and chemically treat chilled water system per Owner's water treatment specifications. 4.4.5 Verify and document evaporator flow rate of 538.5 USGPM at 39.7 ft H2o pressure drop. 4.5 Electrical / Power 4.5.1 Provide all power wiring, conduit, and terminations from existing electrical service to new chiller. 4.5.2 Verify existing electrical infrastructure can support MCA of 387.5 A at 460V / 30 / 60 Hz; coordinate with electrical engineer if upgrade required. 4.5.3 Provide overcurrent protection sized per manufacturer requirements (Max 500 A fuse/CB). 4.5.4 Provide grounding per NEC and Massachusetts Electrical Code (527 CMR 12.00). 4.5.5 Provide power entry through factory opening: 254 mm W x 330.2 mm H (10" x 13 "). 4.5.6 Provide control wiring entry through factory opening: 76.2 mm W x 292.1 mm H (3" x 11.5"). 4.5.7 Coordinate with Owner for required electrical service shutdowns. 4.6 Controls and BAS Integration 4.6.1 Integrate new chiller with existing Building Automation System (BAS) via factory-provided BACnet interface. 4.6.2 Provide all control wiring, conduit, terminations, and programming. 4.6.3 Provide BAS points list including but not limited to: chiller enable/disable, chilled water setpoint, chilled water supply/return temperatures, flow status, alarm status, compressor status, % load, fault codes. 4.6.4 Coordinate with Owner's BAS contractor for graphics and programming integration. 4.6.5 Provide chilled water flow switch and interlock with chiller. 4.6.6 Test and demonstrate all control sequences to Owner. 4.7 Rigging, Crane, and Pad/Roof Work - ROOF WORK NOT APPLICABLE 4.7.1 Provide all rigging, cranes, hoisting, and equipment required to remove existing chiller and set new chiller (16,525 lb operating weight; 15,973 lb shipping weight). 4.7.2 Provide engineered lift plan signed by a Massachusetts-licensed Professional Engineer. 4.7.3 Coordinate crane locations, road closures, and any required permits with Town of Plymouth. 4.7.4 Protect roof membrane, building finishes, walkways, landscaping, and adjacent equipment during rigging operations. 4.7.5 Verify structural capacity of existing pad/curb; provide modifications, new pad, or curb adapter as required. 4.7.6 Restore any damaged surfaces to original or better condition. 4.8 Startup, Commissioning, and Training 4.8.1 Coordinate factory-authorized startup by manufacturer (startup included with equipment purchase per supplier). 4.8.2 Provide commissioning agent or perform contractor commissioning per ASHRAE Guideline 0 and Guideline 1.1. 4.8.3 Verify and document all performance parameters: capacity, kW input, EER, leaving fluid temp, GPM. 4.8.4 Provide minimum eight (8) hours of on-site training to Owner's maintenance personnel covering operation, routine maintenance, troubleshooting, BAS interface, and safety. 4.8.5 Provide functional performance testing report.