Specifications

2.7.19 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 condenser section and

releases it into the atmosphere in the cooling tower. These

systems provide the most efficient means of creating

chilled water. They are as much as 20% more efficient than

air cooled chillers.

2.7.20 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

saves the energy that the valve would otherwise have

absorbed. This change can amount to savings of 15–20%

or more. Trimming the pump impeller is irreversible, so if

the conditions change and higher flow is required the

impeller must be replaced.

Frequency

converter

Water

Inlet

Water

Outlet

BASIN

Flow or pressure sensor

Condenser

Water pump

Throttling

valve

Supply

CHILLER

130BB452.10

Illustration 2.14 Frequency Converter used with a Condenser Pump

Introduction VLT® HVAC Drive FC 102 Design Guide

MG16C102 - Rev. 2013-08-20 27