FC101 Design Guide

3.1.10 With a Frequency Converter
175HA206.11
Pump
Flow
Return
Supply
air
V.A.V
outlets
Duct
Mains
Pump
Return
Flow
Mains
Fan
Main
B.M.S
Local
D.D.C.
control
Sensors
Mains
Cooling section Heating section
Fan section
Pressure
control
0-10V
or
0/4-20mA
Control
temperature
0-10V
or
0/4-20mA
Control
temperature
0-10V
or
0/4-20mA
VLT
M
- +
VLT
M
M
P
T
VLT
x3 x3
x3
D.D.C. Direct digital control
E.M.S. Energy management system
V.A.V. Variable air volume
Sensor P Pressure
Sensor T Temperature
Figure 3.10 Fan System Controlled by Frequency Converters
3.1.11 Application Examples
The following sections give typical examples of
applications within HVAC.
3.1.12 Variable Air Volume
VAV or variable air volume systems, control both the
ventilation and temperature to fulll the requirements of a
building. Central VAV systems are considered to be the
most energy-ecient method to air condition buildings. By
designing central systems instead of distributed systems, a
greater eciency can be obtained.
The eciency comes from utilizing larger fans and larger
chillers which have much higher eciencies than small
motors and distributed air-cooled chillers. Savings are also
seen from the decreased maintenance requirements.
Product Overview Design Guide
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