Danfoss VLT Series Design Manual page 20

2. Introduction to VLT HVAC Drive
2.7.9. Without a frequency converter
The figure shows a fan system made in the tradi-
2
tional way.
2.7.10. With a frequency converter
The figure shows a fan system controlled by VLT HVAC Drive frequency converters.
20
D.D.C.
E.M.S.
V.A.V.
Sensor P
Sensor T
®
MG.11.B2.02 - VLT is a registered Danfoss trademark
®
VLT HVAC Drive Design Guide
= Direct Digital Control
= Energy Management
system
= Variable Air Volume
= Pressure
= Temperature