Design / Build Services for UNH Gables North & South ‐ Boiler Replacement

2026-11-03

USNH , representing UNH Facilities Project Management , is seeking qualified firms to provide design / build services for Gables North & South Boiler Replacement . Scope of Work UNH 2024 - 0005 — Gables North & South Boiler Replacement Project January 29 , 2026 This project includes the complete removal and replacement of the existing Lochinvar Copper - Fin II hot water boilers and related systems in both the Gables North and Gables South buildings . The following scope is written for one building and shall be applied equally to both . 1 . Pre - Removal System Cleaning • Prior to removing or disconnecting any components , flush the existing hydronic system using BoilerMag BM3 or an approved equal . • Add 1 pint of cleaner per 25 gallons of system capacity . • Circulate cleaner through the system for a minimum of 1 hour and a maximum of 7 days . • Use indicator test strips to verify proper cleaner concentration . • Flush the system until water runs clear , then perform a second test to confirm that the system is fully cleaned . 2 . Boiler and Pump Replacement • Remove the existing boilers , pumps , breeching , and associated components . • Install two ( 2 ) Lochinvar FTX850 condensing boilers or approved equal . • Modify the existing concrete housekeeping pads as required to fit new units . • Install new Bell & Gossett Ecocirc XL20 - 140 boiler pumps or approved equal . • Provide all required accessories including : o Shut - off valves o Thermometers o Pipe insulation o Hangers and supports o Pipe labeling 3 . Combustion Air and Venting • Install new combustion air and exhaust venting in accordance with : o Manufacturer requirements o Local code requirements • Terminate venting at an existing boiler room louver . • If penetration of the louver is required : o Provide a properly sized sleeve o Seal watertight o Install manufacturer - recommended weather caps o Modify the interior of the louver as needed • Coordinate exact louver location with the Owner . • Cap existing breeching to maintain operation of domestic water heaters . 4 . Condensate System • Install the manufacturer - recommended condensate filtration system . • Pipe boiler condensate to existing floor drains . • Provide one ( 1 ) spare condensate filter for Owner use . 5 . Boiler Piping Modifications • Modify existing boiler piping to add a full - size common pipe connecting to the existing system , establishing a primary - secondary hydraulic arrangement . • Remove existing mixing valves and associated controls . • Replace removed valves with full - size insulated piping . 6 . Natural Gas Piping • Extend existing natural gas piping to serve the new boilers . • Provide : o Plug valves o Strainers o Gas regulators 7 . Controls • Modify the existing controls system to support : o New boilers o New boiler pumps o Elimination of mixing valves • Review and confirm revised sequence of operations with the Owner . 8 . Electrical • Extend existing electrical circuits to new equipment . • Provide new local disconnect switches as required . 9 . Commissioning • Provide factory start - up services for the new boilers .

New Hampshire

2026-04-28