Daikin EWAD495TZ-SSB2 [101/104] Technical specifications

dedicatedheat exchanger and additionalpiping to carry theoil from the compressorto heat exchanger and

viceversawillbenotaccepted.

•Thecompressorshallbeprovidedwithanintegrated,highefficiency,cyclonictypeoilseparatorandwith

built-inoilfilter,cartridgetype.

•Thecompressorshallbedirectelectricaldriven,withoutgeartransmissionbetweenthescrewandthe

electricalmotor.

•Thecompressorcasingshallbeprovidedwithportstorealizeeconomizedrefrigerantcycles.

•Theeconomizercycleshallbeprovidedwithelectronicexpansionvalve

controlofthecompressorcapacitythroughinverterinordertocontinuouslymodulatethecompressor’s

rotationalspeed.

•Theunitcapacitycontrolshallbeinfinitelymodulatingbetween100%andtheminimum.

Thechillershallbecapableofstableoperationtominimumcapacitywithouthotgasbypass.

•Thesystemshallcontroltheunitbasedontheleavingevaporatorwatertemperaturethatshallbecontrolled

byPID(ProportionalIntegralDerivative)logic.

•Unitcontrollogicshalltomanagefrequencylevelofthecompressorelectricmotortoexactlymatchplant

loadrequestinordertokeepconstantthesetpointfordeliveredchilledorhotwatertemperature.

•Themicroprocessorunitcontrolshalldetectconditionsthatapproachprotectivelimitsandtakeself

correctiveactionpriortoanalarmoccurring.Thesystemshallautomaticallyreducethechillercapacitywhen

•Basemotorfrequencyshallpermitmotortobeutilizedatnameplatevoltage.Adjustablefrequencyrange,

monitoredbyunit’smicroprocessorcontrol,shallpermitastableunitcapacitycontroldowntominimum

capacitywithouthot-gasbypass.

•Unitdisplacementpowerfactorshallbenotlessthan0.95onentireunitcapacityrange,from100%downto

minimumcapacity.

Evaporator

(Singlecircuitunit)

Theunitsshallbeequippedwithadirectexpansionplatetoplatetypeevaporator.

•Theevaporatorwillbemadeofstainlesssteelbrazedplatesandshallbelinkedwithanelectricalheaterto

•Flowswitchonevaporatoravailableasoption(shippedloose).

•Waterfilterwillbestandard.

(DualCircuitunits)

Theunitsshallbeequippedwithadirectexpansionshell&tubeevaporatorwithcoppertubesrolledintosteel

tubesheets.Theevaporatorshallbesingle-passonboththerefrigerantandwatersidesforpurecounter-flow

heatexchangeandlowrefrigerantpressuredrops.

•Theexternalshellshallbelinkedwithanelectricalheatertopreventfreezingdownto-28°Cambient

temperature,controlledbyathermostatandshallbeinsulatedwithflexible,closedcellpolyurethaneinsulation

material(20-mmthick).

•Theevaporatorwillhave2circuits,oneforeachcompressorandshallbesinglerefrigerantpass.

Condenser coilThecondenserismadeentirelyofaluminumwithflattubescontainingsmallchannels.Full-

depth louvered aluminum fins are inserted between the tubes maximizing the heat exchange. The

Microchannel

technologyensuresthehighestperformancewiththeminimumsurfacefortheexchanger.Thequantityof

101/104

TECHNICAL SPECIFICATIONS