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Introduction
General Description
Daikin Centrifugal Water Chillers are complete, self-contained, automatically controlled fluid chilling units. Each unit
is completely assembled and factory tested before shipment. Models DWSC/DWDC are cooling-only.
In the DWSC, each unit has one compressor connected to a condenser and evaporator. The DWDC series is equipped
with two compressors operating in parallel on a single evaporator and condenser. Information in this manual referring
to all DWSC and DWDC units except where specifically noted.
The chillers use refrigerant R-134a (or R513A) to reduce the size and weight of the package compared to negative
pressure refrigerants, and since these refrigerants operates at a positive pressure over the entire operation range, no purge
system is required.
The controls are pre-wired, adjusted and tested. Only normal field connections such as piping, electrical and interlocks,
etc. are required, thereby simplifying installation and increasing reliability. Most necessary equipment protection and
operating controls are factory installed in the control panel.
The basic sizes of units are the 079, 087, 100, 113 and 126. They provide a cooling capacity range from 80 tons to 2500
tons. In this manual all references to the DWSC models will equally apply to other models unless specifically referenced
otherwise.
Application
The procedures presented in this manual apply to the standard DWSC/DWDC family of chillers. Refer to the Operating
Manual, OM CentrifMicro II (latest version available on www.daikineurope.com), for details on operation of the
MicroTech II unit controller.
All Daikin centrifugal chillers are factory tested prior to shipment and must be initially started at the job site by a factory
trained Daikin service technician. Failure to follow this startup procedure can affect the equipment warranty.
The standard limited warranty on this equipment covers parts that prove defective in material or workmanship. Specific
details of this warranty can be found in the warranty statement furnished with the equipment.
Cooling towers used with Daikin centrifugal chillers are normally selected for maximum condenser inlet water
temperatures between 75°F and 90°F (24°C and 32°C). Lower entering water temperatures are desirable from the
standpoint of energy reduction, but a minimum does exist.
Nomenclature
D = Daikin
W = Water-cooled
D = Dual Compressor
S = Single Compressor
D W D C 079
Chiller Model, Based on
Impeller Diameter
Centrifugal Compressor
D–EIMWC00808-16HU - 10/64
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