Howe 2000-RLE - Piping Table; Refrigerant Pipework; Refrigerant Pipework Insulation Requirements

EngineeringGuidelines
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7
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PipingTable
Model LiquidLine* SuctionLine* SuctionRiser*
1000‐RLE 3/8”ODS 7/8”ODS 3/4”ODS
2000‐RLE 1/2"ODS 1‐1/8”ODS 7/8”ODS
3000‐RLE 1/2"ODS 1‐3/8”ODS 1‐1/8”ODS
*Forrunsupto150feet.Iflonger,usenextlargerlinesize.
RefrigerantPipework
Howerecommendsthefieldrefrigerantpiping
beinstalledaccordingtotheSuggested
RefrigerantPipingDiagramshownonprevious
page.ThesepipesizesareforHFCrefrigerants
andarenotapplicabletoR‐744installationsor
secondaryrefrigerantapplications.
Howerecommendstheuseofharddra w nACR
typeLtubingwithrefrigeration
gradewrought
copperlongradiuselbowsandfittingsonly.No
softdrawntubingshouldbeusedinthe
refrigerantpipeinstallation.
NofieldinstalledP‐typeoiltrapisrequiredat
thebaseofthesuctionrisersinceallIceFlakers
areinternallypipedwithasuctiontrapatthe
outletoftheevaporatorwithintheenclosure.
EvaporatorPressureRegulator(EPR)valves
mustbefieldinstalledwiththearrowcorrectly
pointinginthedirectionofflow.
Installationspecificationsshouldrequireall
refrigerantpipingshouldbejoinedwitha
suitablesilverbrazingalloywhilepurging
nitrogenthroughthepipingtopreventcopper
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oxidationscalefromforminginsidethetubing.
ForclosecouplingIceFlakertoCondensing
Unit,useaminimumoftenfeettotalstraight
lengthofpipe.Minimizebendsandfittings.
SuctionLinetoincludeEPRandHeatExchanger.
RefrigerantPipeworkInsulation
Requirements
Fieldrefrigerantpipeworkshouldbeinsulated
withclosedcellflexibleelastomericfoam
thermalinsulationintendedforcold
applications.
Liquidlinesshouldbecoveredwith1/2”thick
andsuctionlineswith3/4”thickmaterial.
Theinsulationmaterialshouldbemoisture
vaporresistantwhencorrectlyinstalled
accordingtothemanufacturer’sinstructions.
Thefield
installedEvaporatorPressure
Regulator(EPR)valveandSuctionLineHeat
Exchangermustlikewisebeinsulated.Ifthese
systemcomponentsareleftun‐insulatedthey
become“thermalbridges”andunwanted
condensationandicewillformanddrip.
Allbuttjointsandseamsmustbeproperlyfield
fabricatedaccordingtotheinsulation
manufacturer’sfusingadhesiveinstructions.
Self‐adheringclosedcellfoaminsulationisalso
availableinrollsandcanbeusedtosupplement
theconventionaltubularmaterialsonirregular
shapes,EPRvalves,andcaps.
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