J--GATE-REPLACE HVAC SYS AT BLDG 47&58-SAHO

Gateway National Recreation Area Sandy Hook Unit Replace HVAC Systems at Building 47 & Building 58 DATED: March 2026 NATIONAL PARK SERVICE NORTHEAST REGION -- 1 of 6 -- SCOPE OF WORK Replace HVAC Systems at Building 47 & Building 58 Gateway National Recreation Area - Sandy Hook Unit Intent The intent of this contract is for a complete Replacement and installation of the HVAC systems at Building 47, and for the complete replacement and installation of the cooling systems at Building 58. The replacement of the heating and cooling systems at Building 47 will include, but not limited to, two (2) -five (5)-ton air conditioner condensing unit, two (2) air handler, line set, oil burning hot water boiler, and thermostat. This work will be conducted at 47 Kearney Road located in the Sandy Hook Unit of Gateway National Recreation Area, Fort Hancock, and Monmouth County, New Jersey 07732. The replacement of the cooling systems at Building 58 will include, but not limited to, two (2) -four (4)-ton air conditioner condensing unit, two (2) air handler, line set, and thermostat. This work will be conducted at 55 Magruder Road located in the Sandy Hook Unit of Gateway National Recreation Area, Fort Hancock, and Monmouth County, New Jersey 07732. The Contractor shall: Heating In Building 47: • Contractor shall complete decommissioning and removal of the existing Smith 8 Series S/W-5 boiler and all associated near-boiler piping (as necessary). Existing boiler shall be properly disposed of offsite. The boiler is located in the basement of Building 47. • Contractor shall provide and replace the existing oil burning hot water boiler (Smith 8 Series S/W-5). The replacement boiler shall be a High-Efficiency 3-Pass Cast Iron Water Boiler. The new boiler shall be Energy Star rated with a minimum of 86% AFUE. • Contractor shall perform a Manual J Heat Loss Calculation to determine the correct BTU output for the building to ensure the new unit is properly sized. The boiler shall be sized based on the calculations and fit within the space of the existing boiler and be able to be piped directly into the existing heating system with minimum pipe work. • Install a magnetic system filter on the return line to protect the new heat exchanger from existing system sludge. Install a new expansion tank, air separator, water feed valve, backflow preventer, and a Low Water Cut-Off (LWCO) safety device. • The boiler shall have burner access with a swing-away burner door for ease of future burner conversion and maintenance. • The hot-water boiler shall have a display Manager and base. New boiler shall be commercial grade oil heat boiler and connected to the exist fuel line. • Inspect the existing chimney flue and install a new barometric damper, and liner if necessary. • Update boiler emergency switch and wiring to meet current National Electrical Code (NEC) standards. • Boiler shall be a "Universal" or "Dual-Fuel Ready" heat exchanger approved by the manufacturer for both heating oil and propane (LP) gas firing. Shall install a high-performance Flame Retention Oil Burner. The unit must be compatible with a future swap to a Power Gas Burner. Page 1 of 5 -- 2 of 6 -- • Contractor shall Modify existing hydronic heating system to use glycol mixture. Drain existing system water, flush all heating loops, and introduce a -20°F rated propylene glycol solution. Adjust system components for glycol compatibility, including pump sizing, expansion tank capacity, and control settings. Refill and purge all air from the system, verify proper circulation, and test system performance under glycol conditions. This shall be a closed system. • Perform a full combustion analysis after installation and provide a printed report of the efficiency, CO2, and smoke levels. • Minimum 10-year manufacturer warranty on the heat exchanger and 1-year labor warranty from the contractor. Cooling In Building 47: • Contractor shall complete decommissioning and removal of the existing two (2) 5-ton air conditioning condensers (Goodman GSX130601BB) and provide and replace them with high-efficiency units. • Contractor shall perform a fresh load calculation to verify that the existing two (2) 5-ton units remain the appropriate size for the building. The load calculation shall be discussed with the Park and if the existing condenser size is determined to be appropriate, the replacement condensers shall be a minimum of 5-tons with a R-454B refrigerant. The condenser shall be Energy Star Certified, no less than 18 SEER2, and be a variable or 2-stage compressor. • The condenser shall be designed for a coastal and Marine environment and shall be saltwater corrosion resistant. If the condenser is not called out as specifically for coastal/marine use, a coastline anti‐ Corrosive coating for saltwater environment shall be applied on all components including but not limited to: o Condenser coil and internal exposed components o Evaporator Coil and some internal exposed components o And copper corrosion resistant “Grenade” fitting shall be installed. • The new condensers shall be installed in the exact location of the old units. New condenser pads, whips, and disconnects shall be provided and installed for each new condenser. The condensers do not need to be raised or elevated. The AC condenser unit replacement shall fit in the existing footprint and be a low- profile unit that vents upwards. • The two (2) horizontal air handlers shall be replaced with the same brand of condenser to ensure compatibility and tied into the existing systems and ductwork. Ductwork modifications shall be completed as needed. Seal the connection between the new air handler and the existing plenum to ensure an airtight bond. The two air handlers are located in the attic (2nd floor) of Building 47 • The new air handlers shall include hot water coils. The heating coils shall be connected, and the heating system shall be operational. The air handles shall be a High Efficiency blo…