Galletti LEW CS/CL 244 [53/56] Working limits

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Page53of56

RG66006951‐Rev.01

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Themachines'performancecanbecalculatedwiththeselectionsoftware.

5.1 Working limits

‐ Heattransferfluid:waterormixtureofwaterandmax30%glycolantifreeze

‐ Maximumwatersidepressure: =3bar

‐ Maximumpressureonhighpressure side =45bar‐r(**)

‐ MaximumambientT=45°C

‐ MinimumambientT=‐10°C

‐ Maximumpressureonlowpr

essureside =29bar‐r(*)

‐ Powersupplyvoltage:   =+/‐10%comparedtoplatevoltage

‐ MaximumstorageT   =+50°C

‐ MinimumstorageTemp=‐20°C(limitsetbyon‐boardelectronics)

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(*)thisvaluecanonlybereachedduringstorageanddet

erminesthesaturationpressureof30bar‐roftherefrigerant

onthelowpressuresideofthecircuit(valuewhichdeterminesitslimits).

(**)forunitswithpoweroutputshigherthan140kWpercircuit,asecondpressureswitchsetsthethresholdto40.5

bar.

5.2 Water flow to evaporator

Thenominalflowrateisbasedonatemperaturedifferentialof5°Cbetweeninletandoutletwater,inrelationtothe

coolingcapacityprovidedatthenominalwater(12/7°C)temperatures.

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Themaximumallowableflowrateisassociatedwithatemperaturedifferentialof3°C.Higherflowratescause

unacceptabledropsinpress

ure.

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Theminimumallowableflowrateisachievedwithatemperaturedifferentialof8°C.Lowerflowratesmayresultinlow

evaporationtemperatures,whichcouldtriggerthesafetydevicesandstoptheunit.Theymayalsocauseanincorrect

distributionorheattransferinanon‐turbulentornotfullyturbulentflow.

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