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Figure 2-2 Cooling Inlet Adapter

Liquidrefrigerantisinternallychanneledtotwo(2)solenoidvalves.Thesevalveshaveintegralorificesthatactas

expansiondevicestocoolthecompressormotor,shaft(rotor)andpowerelectronics.TTS300andTGS230

compressorshavethesesolenoidsarrangedsothatallcomponentsarecooledinserieswitheachotherandthe

solenoidsactastwo(2)stagesofcoolingcapacity.TheTTS350,TTS400,TTS450,TTS500,TTS700,TTH375,TGS310,

TGS380,TGS390,TGS490,TGS520,andTGH285compressorshaveseparatecoolingpathsformotorandpower

electronics.Thesecoolingmethodsareidentifiedasserialorsplitcooling.

Serialcoolinghasitsreturnpointtotheinletofthefirst-stageimpeller,thuscoolingallcomponentswithrefrigerant

evaporatingatthesaturatedsuctiontemperature.Inserialcoolingversions,SolenoidOne(1)isopenedifany

temperaturereachesits“turnon”pointandSolenoidTwo(2)isopenedifanytemperaturereachesasecond“turn

on”pointvalue.RefertoFigure2-5CompressorCoolingPath-TTS300/TGS230onpage37.

Thesplitcoolinghasthemotor/shaftcoolingcircuitreturntothefirst-stageimpellerinletandthepowerelectronics

returntothesecond-stageimpellerinlet.Thisensuresahigherevaporating(cooling)temperaturetominimize

condensationaroundthepowerelectroniccomponents.Inthesplitcoolingversion,SolenoidOne(1)isopenedif

eitherthecavitytemperatureorthemotortemperaturereachesits“turnon”pointandSolenoidTwo(2)isopenedif

theInverterorSCRtemperaturereachesits“turnon”point.RefertoFigure2-4SplitCoolingPath-(TTS/TGS(Except

TTS300/TGS230SerialCooling))onpage36.

Mediumtemperature(MT)versioncompressorsrequiretheirmotorcoolingsuctionlinetobeventedexternallyto

themainsuctionlinethroughanevaporatorpressureregulating(EPR)valve.Thisvalveisrequiredtoensurethat

evaporatingtemperaturescoolingthemotorandelectronicsdonotgettoocold.TheEPRvalveshouldbeadjusted

tomaintainaminimumevaporationtemperatureof0.8°C(34°F).RefertotheTTS/TGS/TTH/TGHApplicationsManual

forfurtherdetails.

SerialCoolingcompressorscanbeidentifiedbyhavingonlyone1/4inchflareSchraderconnectionadjacenttothe

mainmotorcoolingliquidconnection,whileasplitcoolingmodelwillhavetwo(2).These1/4inchflareconnections

accesstherefrigerantfeedstothecomponentsbeingcooledandbypassthesolenoidvalves.Aminimumpressure

ratioof1.5andafullliquidsealatthecompressorisrequiredtoensureproperandcorrectcompressorcooling.



Page 34 of 294 - M-SV-001-EN Rev. H 1/23/2023

Danfoss TTS300 User Manual

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