Conair MPW User's Guide download pdf (Page 51)

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CoolantFlowSwitch

Thisswitchislocatedinthepipingdirectlybeforetheevaporatorinlet.Itshutstheunitdownif

thereisinsufficientcoolantflowthroughtheevaporator.Theswitchisnotadjustable.Ifthe

chillershutsdownduetolowcoolantflow,restartusingtheHMIonthecontrolpanel.

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CrankcaseHeater

Thecompressorcrankcaseheaterpreventstoohighofrefrigerantconcentrationintheoil

duringshutdown.Itismountedaroundtheoutershellofthecompressorandisreplaceableif

necessarywithoutaccessingtherefrigerationcircuit.

Evaporator

Theevaporatorhasstainlesssteelplatesandcopperbrazing.Therefrigerantpassesbetween

everyothersetofplates,whilethecoolantflowsontheothersideofthe platesintheopposite

direction.Werecommendimplementingaproperwatermaintenanceprogramtopreservethe

qualityofchilledwaterdesired.Excessiveevaporator

foulingcausedbypoorchilledwater

qualitywillcausepoorchillerperformanceandorchillerfailure.

HotGasBypassValve

Thisvalveislocatedintherefrigerantlinethatrunsfromthecompressordischargetothe

evaporatorinlet.Itisdesignedtoartificiallyloadthechillerwhenthechillerisnotfullyloaded

bytheprocess.Thisisaccomplishedbydirectingsomeofthehotcompressordischarge gas

directlybackintotheevaporatorinsteadofgoingthroughthecondenser.Themicroprocessor

controllercontrolstheamountofhotgasused.Eliminatingcyclingofthecompressoris

extremelydesirableasitsignificantlyextendsitslifetimeexpectancy.

HighRefrigerantPressureSwitch

Thehighrefrigerantpressureswitchlimitsthecompressordischargepressuresothatitstays

withinthedesignparametersofthecompressor.Theswitchislocatedonthecompressor

dischargeline.Itissettoopenat575PSIG(3964kPa)onEP2AandEP2Rchillers,and540PSIG

(3723kPa)onEP2Wchillers.Thisswitchhasamanualreset.

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Shouldtheswitchopenwhenafaultconditionoccurs,pressingtheresetbuttononthebackof

theswitchandpressingthealarmresetbuttononthecontrolpanelwillresetthealarm.The

settingontheswitchisnotadjustable.

LowRefrigerantPressureSwitch

Thelowrefrigerantpressureswitchisdesignedtolimitthecompressorsuctionpressureto

withinthedesignedparametersofthecompressor.Theswitchislocatedinthesuctionsideof

thecompressorandcanberesetbypressingthealarmresetbuttononthecontrolpanel.The

settingonthisswitch

issettocutoutat40PSIG(275kPa)andcutinat95PSIG(655kPa).

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Conair MPW User's Guide Page 51