User guide

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Corporate Office: 724.584.5500  Instant Access 24/7 (Parts and Service): 800.458.1960  Parts and Service: 814.437.6861
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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).