Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual page 17

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Introduction to VLT HVAC Ba...

2.5.13 The VLT Solution

While dampers and IGVs work to maintain a constant pressure in the ductwork, a frequency converter solution saves much

more energy and reduces the complexity of the installation. Instead of creating an artificial pressure drop or causing a

decrease in fan efficiency, the frequency converter decreases the speed of the fan to provide the flow and pressure required

by the system.

Centrifugal devices such as fans behave according to the centrifugal laws. This means the fans decrease the pressure and

flow they produce as their speed is reduced. Their power consumption is thereby significantly reduced.

The PI controller of the VLT HVAC Basic Drive can be used to eliminate the need for additional controllers.

VLT HVAC Basic Drive Design Guide

Cooling coil

Heating coil

MG.18.C2.02 - VLT

Pressure

signal

Frequency

converter

Filter

Supply fan

Frequency

converter

Return fan

is a registered Danfoss trademark

VAV boxes

Pressure

transmitter

Flow

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