Pressure Transmitter Placement in HVAC VFD Systems Technical Bulletin

This document explains how the placement of pressure feedback transmitters in HVAC variable frequency drive (VFD) systems critically determines actual energy savings, with optimal location at the load (distribution system extremities) rather than at the pump or fan discharge. It details the technical reasoning behind the "two-thirds distance" rule, showing that proper transmitter placement allows a lower controller setpoint that reduces both flow and pressure, maximizing power reduction and achieving the anticipated energy conservation.