Danfoss VLT 6000 HVAC Series User Manual

Cooling Tower Fan
Cooling Tower Fans are used to cool condenser water in water cooled chiller systems. Water cooled chillers
provide the most efficient means of creating chilled water. They are as much as 20% more efficient than air cooled
chillers. Depending on climate, cooling towers are often the most energy efficient method of cooling the condenser
water from chillers.
They cool the condenser water by evaporation.
The condenser water is sprayed into the cooling tower onto the cooling towers “fill” to increase its surface area.
The tower fan blows air through the fill and sprayed water to aid in the evaporation. Evaporation removes energy
from the water dropping its temperature. The cooled water collects in the cooling towers basin where it is pumped
back into the chillers condenser and the cycle is repeated.
The new standard
With a frequency converter, the cooling towers fans
can be controlled to the required speed to maintain the
condenser water temperature.T frequency converters
can also be used to turn the fan on and off as needed.
Several features of Danfoss HVAC dedicated drive,
the VLT 6000 HVAC can be utilized to improve the
performance of your cooling tower fans application. As
the cooling tower fans drop below a certain speed, the
effect the fan has on cooling the water becomes small.
Also, when utilizing a gear-box to frequency converter
the tower fan, a minimum speed of 40-50% may be
required.
The customer programmable minimum frequency set-
ting of the is available to maintain this minimum fre-
quency even as the feedback or speed reference calls
for lower speeds.
Also as a standard feature, you can program the fre-
quency converter to enter a “sleep” mode and stop the
fan until a higher speed is required. Additionally, some
cooling tower fans have undesireable frequencies that
may cause vibrations. These frequencies can easily
be avoided by programming the bypass frequency
ranges in the frequency converter.
Water Inlet
Water Outlet
CHILLER
Temperature
Sensor
BASIN
Conderser
Water pump
Supply
VLT
®
6000 HVAC Series
20 MG.61.B5.02 - VLT
®
is a registered Danfoss trademark

Danfoss VLT 6000 HVAC Series Specifications

General

Brand	Danfoss
Model	VLT 6000 HVAC Series
Category	DC Drives
Language	English