scope:

This standard applies to FDD systems that are intended to detect or diagnose faults that affect the performance of air economizers of air-conditioning equipment.

This standard defines laboratory tests for faults in four categories of economizer function: sensor communication, actuator communication, damper and actuator responsiveness, and damper position.

This standard only applies to those FDD systems designed to detect or diagnose faults by evaluating instantaneous or short-term conditions and parameters.