Chiller
CSI Division 23, HVAC
Central plant equipment that cools water (or another refrigerant-based fluid), then circulates that chilled water to air handling units throughout a building, the standard cooling source for large commercial, institutional, and high-rise buildings where individual rooftop units aren't practical.
Why it matters
A chiller is one of a project's largest and longest-lead mechanical purchases, so ordering it late, or ordering the wrong capacity, doesn't just risk a schedule delay: it can leave an entire building without cooling capacity for months while a replacement unit is fabricated and shipped.
On a real project
A hospital's central plant is designed around a chiller sized for the building's full cooling load, ordered many months ahead of when it's actually needed on site because the manufacturer's fabrication and delivery lead time is longer than nearly any other piece of equipment on the project.
Who this matters most to
An HVAC Technician commissions and maintains the chiller plant, work that requires specialized refrigerant handling training beyond typical rooftop unit service. A Facilities Manager relies on the chiller as critical equipment worth a preventive maintenance contract, since an unplanned chiller failure can mean losing cooling for an entire building at once.
Where this goes wrong
A project team delays finalizing the chiller's exact capacity until late in design, not realizing the manufacturer's lead time was already the tightest item on the entire procurement schedule. The late order pushes the chiller's delivery past when the building needs cooling for testing and occupancy, forcing a costly temporary cooling rental to bridge the gap.