Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual page 20

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Introduction to VLT HVAC Ba...

2.5.18 Condenser Pumps

Condenser Water pumps are primarily used to circulate water through the condenser section of water cooled chillers and

their associated cooling tower. The condenser water absorbs the heat from the chiller's condenser section and releases it

into the atmosphere in the cooling tower. These systems are used to provide the most efficient means of creating chilled

water, they are as much as 20% more efficient than air cooled chillers.

2.5.19 The VLT Solution

Frequency converters can be added to condenser water pumps instead of balancing the pumps with a throttling valve or

trimming the pump impeller.

Using a frequency converter instead of a throttling valve simply saves the energy that would have been absorbed by the

valve. This can amount to savings of 15-20% or more. Trimming the pump impeller is irreversible, thus if the conditions

change and higher flow is required the impeller must be replaced.

Water

Inlet

BASIN

VLT HVAC Basic Drive Design Guide

Frequency

converter

Flow or pressure sensor

Water

Outlet

Condenser

Water pump

MG.18.C2.02 - VLT

is a registered Danfoss trademark

Throttling

valve

Supply

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