Overview:

On Sunday, November 23, our field crew completed a full rooftop unit (RTU) replacement at Kings County Hospital in Brooklyn.
The aging 30-ton rooftop system was removed, the curb was prepared, and a new unit was installed and commissioned within a single 7-hour onsite window, all under live hospital conditions.

Time Highlights

• Phase 1 — Disconnected electrical power and ductwork; demolished and removed existing exhaust and fresh-air fan assemblies.
• Phase 2 — Removed outdated duct sections and prepared the existing curb for crane lift.
• Phase 3 — Lifted and set the new 30-ton RTU onto the existing platform using a crane.
• Phase 4 — Fabricated and installed new supply and return duct transitions; insulated new ductwork with 1-1/2 inch rigid board insulation.
• Phase 5 — Installed water jacket and stand-alone thermostat for temporary system control pending BMS tie-in.

System Specs

🔷 RTU — 30-ton Trane rooftop unit
🔷 Installation Method — Crane-assisted set on existing curb
🔷 Ductwork — New supply and return transitions tied into existing system
🔷 Insulation — 1-1/2 inch rigid board insulation on all new duct sections
🔷 Controls — Stand-alone thermostat (BMS integration by others)
🔷 Completion — 7 hours onsite under active hospital operations

Outcome

The new 30-ton RTU restores reliable cooling capacity, stabilizes airflow, and prepares the system for future BMS integration.
All work was completed safely, efficiently, and with zero disruption to hospital operations.

Fabrication support and transition design were completed in partnership with BAIKAL MECHANICAL.

GRR Cooling Experts — Precision Retrofit Engineering for Critical Environments.

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Watch the Video from the installation