proto

economizer fan vfd freq cmd point

implements

cmd

Point is a command, actuator, AO/BO

economizer

Duct to access fresh outside air only for economizing, not ventilation

fan

Fan equipment or control point

freq

Occurrences per unit time

point

Data point such as a sensor or actuator

vfd

Variable-frequency drive

vfd-freq

VFD frequency measured in "Hz"