Hypertherm Koolant Koolers N-Series - Controller Interface; 8.1 Navigation

 Operation‐Shutdown 
27
7.2.1.4 RecirculationPumpCheck
Fromthechillercontrollerhomescreenpressand/ortohighlighttheMONITORINGselection.Press
toaccesstheMONITORINGmenuandpressuntilthe“RecirculationCircuit”monitoringscreen
appears.Checktherecirculationpump“FlowRate”tomakesureitexceeds13.8gpm(52.2lpm)at50Hzor
16.2gpm(61.3lpm)at60Hz.Iftherecir
culationpumpflowrateislow,theflowratecanbeincreasedby
openingtheglobevalveattherecirculationpumpoutlet.
7.2.1.5 TemperatureCheck
Fromthechillercontrollerhomescreenpressand/ortohighlighttheMONITORINGselection.Press
toaccesstheMonitoringmenu.ThefirstscreenwillbetheProcessTemp
eratureMonitoringscreen.
Checkthe“Tout”onthiss creen.Oninitialstartuptheoutlettem peraturemaybebelowthesetpoint.To
increasethetemperaturequicklythechillerwillturnonthetankheatertowarmupthecoolant.Withina
fewminutestheoutlettemperatureshouldsettleinclosetothesetpoint.
7.2.2 RemoteMode
Oncethechillertemperatureisinthedesiredrange,thechillerisreadytobecontrolledremotelybytheplasma
cuttingsystem.ToenableRemoteMode,turntheLocal/Off/Remo te Swi tchbelowthecontrollertothe
position.Thereshouldnowbea“UnitoninRemoteMode” messageonthehomescreen.Thechill
erwillnow
berunninginStandbyModeawaitingtheRemoteStartsignalfromtheplasmacuttingsystem.WhileinStandby
Modetherefrigerationsystemwillnotrun,butthechillerwillstartthepumpsandheaterasneededtokeepthe
waterwarm.
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NOTICE 
WhilewaitingfortheRemoteStartsignal,thechillerwatertemperaturemayexceedthe
setpointsiftheambienttemperatureishigh.AssoonasthechillerreceivestheRemoteStart
signal,therefrigerationsystemwillstartandthewatertemperatureswilldroptothe
setpoints.
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7.3 Shutdown
Fornormalshutdown,turntheLocal/Off/RemoteSwitchbelowthecontrollertothe“O” position.Thechiller
controllerwillbeginthenormalshutdownsequenceanddisplaya “ShutdowninProgress”statusmessage.The
normalshutdownsequencetypicallytakes2‐5minutes.Duringthistimethecontrollerclosestheliquidline
solenoidinth
erefrigerationsystemandpumps therefrigerantintothecoil,sothereisnoriskofsluggingliquid
refrigerantthroughthecompressoronthenextstartup.Italsoturnsoffthetankheaterwhiletherecirculation
pumpcontinuestoruntodissipateanyresidualheatintheheaterelement.Oncetheshutdownsequenceis
comple
te,thechillercontrollerwilldisplaya“UNITOFF”statusmessage.
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CAUTION 
ShuttingoffthechillerusingtheMainDisconnectHandlewillbypassthenormalshutdown
sequenceandshouldonlybeusedinemergencysituations.Repeatedshutdownusingthe
maindisconnecthandlewillcausedamagetothecompressorsystemandvoidthechiller
warranty.Itcanalsocauseoverheatingoftheinlineheaterandtriptheheaterlimitswitch.
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Hypertherm, Inc. Part Number: 810540