EngA AF Series

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AF / DCU MANUAL
IOM-52 9 of 23 Apr 13 R2
Thesketchbelowdescribesaboveandbelowpipingconnectionsandtraprequirements.Onlyinstall
reducersontheverticalline,atleast12”(300mm)belowtheheaderconnection.
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*12”(300mm)minimumheightbeforereducingsize.
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REFRIGERATIONSPECIALTIES(BYOTHERS)
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Note:
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Refrigerantspecialtiesareselected,suppliedandinstalledbytheinstallingcontractor.
Mostofthesedeviceshavespecifieddirectionsofflowandmaybepermanentlydamagedif
notinstalledcorrectly.Alwaysfollowtheinstallationinstructionsprovidedwiththe
components.
SERVICEVALVES(Recommended)
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Servicevalvesshouldbeinstalledtoallowservicingoftheequipment.Aliquidlineservicevalveatthe
condensingunitisconsideredaminimumrequirement.
SIGHTGLASS/MOISTUREINDICATOR(Required)
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Sightglassesareinstalledintheliquidlinetogiveavisualindicationofthe
refrigerantcharge.Themoistureindicatorgivesanindicationofthemoisture
contentoftherefrigerant.
LIQUIDLINEFILTER‐DRIER(Required)
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Thefilter‐drierisinstalledintheliquidlinetofilterparticulateandforeignmatter
fromtherefrigerant.Filter‐driersalsoabsorbsmallamountsofmoistureandacid.