Case Study: Corporate Oaks II, Chantilly, VA
The challenge with this project was to minimize downtime for the occupied building, reuse the existing roof curb and ductwork/utility connections, and upgrade the electrical wiring from aluminum to copper.
DMR Associates Case Study: Corporate Oaks II, Chantilly, VA.
Owner: H/F Water Dragon, LLC
Management: Metro Management Services, LLC
Contractor: Fidelity Mechanical Services
Summary: The project started on a Thursday night, and by the following Thursday, the new unit was installed and fully operational.
Watch Video: Time lapse of Corporate Oaks II installation
Background
Built in 1987, the original 277-Ton, 85,000 CFM Mammoth Custom Penthouse supplied by DMR needed replacement. The challenge was to minimize downtime for the occupied building, reuse the existing roof curb and ductwork/utility connections, and upgrade the electrical wiring from aluminum to copper.
Project Schedule:
Thursday Night: Prep the unit for removal: evacuate refrigerant charge; disconnect utilities and supply duct connection; cut wiring and piping between unit sections, prepare sections for separation/removal.
Friday: Remove old unit and rig new unit, four sections each. Replace main electrical wiring.
Saturday: Prep new unit for start-up: connect new electrical; make factory pre-engineered electrical/control connections between unit sections; connect BMS communication wiring; perform pre-startup.
Sunday: Perform factory unit controls and fans startup for economizer operation and BMS interface control.
Monday: Unit operating in economizer mode. Begin connecting refrigerant piping across sections, evacuation, charging. Water treatment installed.
Tuesday:Two of four refrigerant circuits operating.
Wednesday: Final two refrigerant circuits operating.
Thursday Morning: Fully Operational.
Enhanced Features of New Unit:
Double Wall Thermal Break Cabinet, Embossed Aluminum Exterior, Aluminum Interior
VFD Supply Fan Control, One VFD per Fan
Exhaust Fans with Variable Speed EC Motors
304 Stainless Steel Coil Casings and IAQ Drain Pan
Updated Evaporative Condenser Design with Stainless Construction, R-410A Refrigerant, VFD Head Pressure Control
Change from (3) Screw Compressors, (3) Circuits to (4) Tandem Scroll Compressors, (4) Circuits
65 KIAC SCCR
Contact DMR for more information on how our team can help with your next retrofit and replacement project.
For more than 80 years, the Mammoth brand, from Nortek Air Solutions, has been creating a comfortable indoor environment for both industrial and commercial customers around the world. From factory-packaged rooftop systems to prefabricated mechanical equipment rooms, Mammoth custom commercial equipment improves air quality and reduces operating costs.