Howe 2000-RLE - Piping; Leak Testing

FieldInstallation
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9
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Piping
TheIceFlakerhasbeenthoroughlycleanedand
dehydratedatthefactory.However,foreign
mattermayenterthesystembywayofthe
pipingtothecondensingunit.Therefore,care
mustbeusedduringinstallationofthepipingto
prevententranceofforeignmatter.
Installallrefrigerationsystemcomponentsin
accordance
withapplicablelocalandnational
codesandinconformancewithgoodpractice
requiredfortheproperoperationoftheIce
Flaker.
Therefrigerantpipesizeshouldbeselected
fromthePipingTable.Theinterconnectingpipe
sizeisnotnecessarilythesameasthestub‐out
onthecondensingunitor
theIceFlaker.
Thefollowingproceduresshouldbefollowed:
1. Donotleaveunitsorpipingopentothe
atmosphereanylongerthanis
absolutelynecessary.
2. Useonlyrefrigerationgradecopper
tubing,properlysealedagainst
contamination.
3. Suctionlinesshouldslope1/4"per10
feettowardsthecompressor.
4. Refer
totheSuggestedRefrigerant
PipingDiagram(p.6)forsuitableP‐type
oiltraplocationstoenhanceoilreturn
tothecompressor.
5. Whenbrazingrefrigerantlines,Dry
Nitrogenshouldbepassedthroughthe
lineatlowpressuretopreventscaling
andoxidationinsidethetubing.
6. Useonlyasuitable
silversolderalloyon
suctionandliquidlines.
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LeakTesting
Afterallrefrigerantconnectionsaremade,the
entiresystemmustbeleaktested.
Thecompletesystemshouldbepressurizedto
nomorethan150psigwithrefrigerantanddry
nitrogen(ordryCO
2
).
Itisrecommendedthatthispressurebeheld
foraminimumof12hoursandthenrechecked.
Forasatisfactoryinstallation,thesystemmust
beleaktight.
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