EngA AF Series

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AF / DCU MANUAL
IOM-52 15 of 23 Apr 13 R2
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REFRIGERATIONPIPINGMATERIALSANDPROCEDURES
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Note:
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Aqualifiedrefrigerationcontractorexperiencedinrefrigerantpipingmustcompletethe
installation.Theinstallationmustbecompletedusingindustry‐acceptedmethodsand
materials.
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WARNING:
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TheAFunitisshippedwithaholdingchargeofdrynitrogen.
Thispressureshallbereleasedsafelybeforeopeningsystemorconnectingtubing.
TUBING
UseNitrogenizedACRgrade,‘TypeL’or‘TypeK’coppertubingonly.Allrefrigeranttubingshallbeclean
anddry.Thetubingshallbenitrogenpurgedduringthebrazingprocess.Thispreventsharmfulcopper
oxidesfromforminginthetubing.
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WARNING:
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Nitrogencylindersshallbeequippedwithahigh‐pressureregulatorandflowmeter.Do
notconnecthigh‐pressurecylinderstotherefrigerantcircuitwithoutaregulator.
Failuretodosomayresultinpropertydamage,injuryordeath.
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Refrigeranttubingmustbecutwithatubecutterandtheendsdeburredbeforeinstallation.Neverusea
hacksaworabrasivecuttertocutrefrigerationtubing.
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Longradiuselbowsshouldbeusedtoreducepressuredrop.
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CoppertocopperconnectionsshouldbemadewithSILFOS,orsimilarsilverbearinglowtemperature
brazingmaterial.
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Coppertobrassorcoppertosteeljointsshouldbemadewith45%silversolderandtheappropriateflux.
Fluxmustbecleanedfromtubingafterinstallation.
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WARNING:
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Softsolders(50/50,95/5,etc)arenotsuitableforusewithairconditioningsystems.
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Allaccessoriesshallbeproperlyprotectedfromheatduringinstallation.Refertotheinstallationguidelines
suppliedwiththecomponents.Itispreferredtoinstallthefilter/drierlasttoavoidextendedexposureto
atmosphere(moisture).
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Pipingshallbeproperlysupportedandallowancesshallbemadeforthermalexpansionorcontractionof
tubing.