Functional Performance Testing (FPT) is best described as:

• A. The process of determining the ability of the HVAC system to deliver heating, ventilating, and air-conditioning services in accordance with the final design intent.
• B. A formal and ongoing record of problems or concerns—and their resolution—that have been raised by members of the commissioning team during the course of the commissioning process.
• C. The minimum head at the pump inlet to prevent cavitation.
• D. A plan for gathering relevant measurement data to evaluate equipment or system performance.

Answer: (B)

Functional Performance Testing is about capturing and tracking performance issues discovered during the commissioning process. It provides a formal, ongoing log of problems or concerns raised by the commissioning team and records how each one is resolved, ensuring nothing slips through and that the system can meet the intended performance as verified. This approach supports accountability, traceability, and a clear path to close out the commissioning phase.

Other descriptions either describe verifying that the system can deliver services per the final design, focus on a specific hydraulic criterion, or outline planning for data collection. While those aspects are part of commissioning, they don’t define the ongoing problem-tracking and resolution record that characterizes this term.