Photos_of_HVAC_systems_at_B26_0001.pdf

This is a photographic documentation file for an HVAC system troubleshooting and repair project at Building 26, Sandy Hook Unit, Gateway National Recreation Area, located within the National Park Service Northeast Region, dated February 2026.

The project involves two Daikin VRV IV heat pump units serving the first and second floors of Building 26. The outdoor units are identified with specific model numbers: RXYQ144XATJA (first floor unit) and RXYQ168TTJU (second floor unit), both manufactured by Daikin Manufacturing Company. The first floor unit has a serial number 31075409 and was manufactured in July 2021, while the second floor unit has serial number 15053009 and was manufactured in May 2015. Both units operate on three-phase, 208/230V, 60Hz power supply with 60A maximum overcurrent protective devices and utilize R410A refrigerant (17.2 LBS and 8.2 LBS respectively). The system includes multiple indoor air handler units distributed throughout both floors, connected via refrigerant piping runs located in the building basement. The photographic documentation shows the exterior mounted heat pump units on a platform at the backdoor, typical interior air handler units installed on both floors, and the basement piping infrastructure connecting the outdoor units to the indoor handlers. The images provide visual reference for the system configuration and current operational condition to support troubleshooting and repair activities.