Large facility HVAC and building services equipment, central plants, boilers, chillers, and the building automation that ties them together.
Large facility HVAC scales up the challenges of building systems to multi-building, multi-chiller central plants. An outage affects entire buildings. Coordination between the central plant, the air handlers, and the building management system is constant. Maintenance here is one of the most coordination-heavy disciplines in a large facility.
Central plant chillers are industrial equipment at scale. They have all the diagnostic patterns of smaller chillers (superheat, subcooling, approach temperatures) with higher consequences. When a central plant chiller fails, the redundancy capacity is the difference between a minor event and a major one. Know your redundancy. Test it annually.
Primary and secondary pumping on a large chilled water loop is a system that has to be tuned for the actual building load. When load changes significantly (an addition, a new tenant, a seasonal shift), the loop may no longer be in balance. Decoupled bypass behavior is the usual symptom. A loop that is not balanced wastes energy and creates comfort complaints that are hard to pin down.
Steam and hot water boilers in a central plant share the same diagnostic patterns as any boiler.
BMS setpoints drift over time. Someone overrides a value to solve a complaint and nobody resets it. A sensor fails and the logic takes the last-known value forever. Annual controls audits catch these things. The savings from an audit-driven setpoint cleanup often pay for a year of the contractor's work on the plant.
Deeper explainers and background reading for technicians working in facility & hvac.
Preventive maintenance replaces the 'run it until it breaks' approach with scheduled inspections and part replacements. Plants that run a solid PM program see 25-30% fewer emergency work orders within the first year. Here is how to build one that sticks.
Pumps fail for predictable reasons: cavitation, dry running, seal wear, misalignment, and a handful of others. Once you know the eight patterns, you can set up monitoring and PM tasks that catch each one early. This guide covers every common failure mode with prevention steps.
The essential maintenance KPIs with formulas, benchmarks, and improvement strategies. OEE, MTTR, MTBF, PM compliance, schedule compliance, and more.
Every rotating machine vibrates. The pattern of that vibration tells you whether bearings are wearing, shafts are misaligned, or components are out of balance. Learning to read vibration data catches 90% of rotating equipment failures weeks before they happen.
Images on this page sourced from Freepik. Credits: dasun404malaka, czdistagon, czdistagon.
