What is the main purpose of a Functional Performance Test (FPT) in Cx?

• A. Visual inspection only.
• B. Only electrical consumption.
• C. Functionality under real operating conditions.
• D. Only sensor calibration.

Answer: (C)

The main idea is to verify that equipment and building control systems actually operate as designed when they’re under real operating conditions. Functional Performance Testing puts systems through their normal operating modes and control sequences, checking that sensors trigger the right actions, actuators respond correctly, sequences execute in the proper order, interlocks work, and the overall performance meets the design intent under varying loads and conditions. This goes beyond a quick visual check or simply measuring energy use or calibrating sensors; it proves that the system functions correctly in practice, delivers the intended comfort and safety, and can meet performance targets during real operation.