Conair MPW Uživatelská příručka stáhnout pdf (Strana 49)

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Components

ChilledWaterReturnTemperatureSensor

Thetemperaturesensorisinthereturnfluidpipingandsensesthetemperatureofthechilled

waterenteringtheevaporator.ThechilledwaterintemperatureisontheHMIscreen.This

probeisdirectlyinthefluidstream,thereisnotasensorwellincluded.

ChilledWaterSupplyTemperatureSensor

Thistemperaturesensorisinthechillerreservoirandittransmitsthechilledwatersupply

temperaturetothePLC.Thereadingfromthissensorisusedasthecontrolvariableforthe

chiller’stemperaturecontrol.Thereadingiscomparedtothesetpointandthehotgasbypass

valveispositionedto

drivethetemperaturereadingtowardsthesetpoint.TheHotGasBypass

Valveisopenedtowards100%whenthetemperatureisbelowsetpoint,andisclosedtowards

0%whenthetemperatureisabovesetpoint.Thisprobeisdirectlyinthereservoir,thereisnot

asensorwellincluded.

Compressor

Thechillerisequippedwithahermeticscrollcompressor.Boththecompressorandthemotor

areencasedtogetherandsolidlymountedinthecabinet.Thecompressorisunidirectionaland

willonlypumprefrigerantwhenproperlyphased.Thecoolrefrigerantsuctiongascoolsthe

motorwindings,andthereisaninternalthermaloverloadtoprotectthewindingsfrom

overheating.Thecompressorislubricatedwithoilthattravelsthroughoutthesystemwiththe

refrigerant.Chillerswithcapacitiesof20tonsormoreareequippedwithtwocompressorsin

tandem.Thecompressorsareabletobeoperatedindependentlyiftheheatloadisnotlarge

enoughtorequirebothcompressors.

CompressorElectronicMotorModule

Thecompressorisfittedwithanelectronicprotectiondevicelocatedwithinthecompressor

motorterminalbox.ThisdevicemonitorsthetemperatureofthemotorwithaseriesofPTC

sensorsmountedinthemotorwinding,thedischargegasandoiltemperatureviatheoil

temperaturesensor,motorrotation,andphasefailure.

Atthetrip‐pointtemperature,the

compressorshutsdownimmediately.Ifanincorrectphaserotationorphasefailureoccurs

withinthefirstfivesecondsafterstart‐up,thecompressorwillalsoshutdownimmediately.If

repeatedphasefailuresoccuroranyotherfaultlistedaboveoccurs,themodulelocksout

and

requiresamanualreset.Themainpowermustbeoffforatleastfivesecondstoresetthe

module.Ifatemperaturefaultoccurred,thecompressormustalsofirstcooldownbeforethe

modulewillreset.

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Conair MPW Uživatelská příručka Strana 49