Conair MPW User's Guide download pdf (Page 53)

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Note:Occasionalbubblinginasightglassmayoccuratatimewhenloadconditionsarechangingandthe

expansionvalveisadjustingtothenewconditions.Thismomentaryoccurrenceisaresultofnormalchiller

operation.

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Anotheruseforthesightglassischeckifthereismoistureintherefrigerationcircuit.

Y‐Strainer

AY‐Strainerwitha20‐meshscreenisintheenteringchilledwaterlinetohelpprotectthe

evaporatorpassagesfromclogging.

AutomaticWaterMake‐Up(Optional)

Withthisoption,awatersupplycanbeconnectedtothechillersothatthewaterlevelinthe

reservoirisautomaticallymaintained.Whenthewaterlevelinthereservoirdropsbelowthe

lowlevelonthefloatswitch,asolenoidvalvewillbeopenedtoallowfreshwaterintothe

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system.Whenthewaterlevelreachesthehighlevelonthefloatswitch,thesolenoidvalveis

closed.

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Note:Thisoptionisnotnormallyrecommendedforsystemsthatdependonaglycolsolutiontopreventfreeze‐

ups.Automaticwatermake‐upmaycausereductionoftheglycolconcentration,whichmayresultinan

evaporatorfreeze‐up.

CoolantPump

Theclose‐coupledcentrifugalpumpisequippedwithamechanicalsealandisconstructedof

stainlesssteel.Thepumpisfactorytestedforthespecifiedoperatingconditions.Thepump

motormeetsNEMAspecificationsandindustrystandards.

UpgradedPumps(Optional)

Thestandardpumpsthathavebeenselectedforeachsizechillerwillmeettherequirementsof

mostapplications;however,incertaininstances,largerpumpsmayberequiredtoprovidethe

desiredflowandpressureforaspecificapplication.Thehorsepowerofthepumpwillbe

indicatedonthechillernameplate.

PressureGauge

Apressuregaugeismountedonthebackpanelofthechiller.Thisgaugedisplaysthepressure

ofthecoolantatthedischargeofthepump.Itcanbeusedtodeterminetheapproximatepoint

onthepumpcurveinwhichthepumpisoperating.

Reservoir

Thereservoirismountedinsidethecabinet.Thereservoirismadeofpolyethyleneandisfully

insulated.Alevelsighttubeisincludedsothecoolantlevelcanbeobserved.Thereisa

removablecoveronthetopofthereservoir.Duringchilleroperationthereservoirshouldbeat

leasthalffull.Formostinstallationsthereservoirhassufficientcapacitytohandlecoolant

drainbackfromtheprocessequipmentwhichoccursduringchillershutdown.Forinstallations

withoverheadpipingrunsofover90feet,(27M)specialprecautionswillhavetobemade

duringinstallation(seeFigure3,onpage

9).

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Conair MPW User's Guide Page 53

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