EngA AF Series

A
AF / DCU MANUAL
IOM-52 7 of 23 Apr 13 R2
CodeANSI/Z223.1/NFPA54,StateandLocalCodesandinaccordancewiththelocalauthorities
havingjurisdiction.
5. TheinstallationofthisunitshallbeinaccordancewiththelatesteditionoftheNationalStandard
PlumbingCode(NSPC),StateandLocalCodesandinaccordancewiththelocalauthoritieshaving
jurisdiction.
6. TheinstallationofthisunitshallbeinaccordancewithallotherNational,StateandLocalCodes,
andinaccordancewiththelocalauthoritieshavingjurisdiction.
CLEARANCEFORAIRFLOW
Properairflowisessentialfortheoperationofthisequipment.Maintainatleast60”(1500mm)clearance
betweenthecoilandanyobstruction.Maintainatleast96”(2400mm)betweenadjacentsections.Donot
placeinawell.Wellscreateasituationwhereairre‐circulatesfromthefanbacktothecoil.Enclosures
mustbedesignedforproperairflowandtopreventblockageorre‐circulatedair.
QUALIFIEDINSTALLER
Tocompletetheinstallation,arefrigerationcontractorexperiencedandqualifiedinsystempipingis
required.Thecontractorisresponsibleforthedesign,selectionandinstallationoftherefrigeration
specialtiesandrefrigerantpipingforthisequipment.Thefollowinginformationisintendedtoprovide
generalinformationandguidelinesforthesuccessfulinstallationofthisequipment.

FordetailedinformationaboutinstallationpracticesconsultASHRAEhandbooks,ANSI/ASMECodes,
ANSI/ASHRAESafetyCodeforMechanicalRefrigeration,CAN/CSAB52MechanicalRefrigerationCodeand
anylocalauthoritieshavingjurisdiction.

Note:

Componentselection,pipingdesignandinstallationoftheairconditioningsystemarethe
responsibilityoftheinstallingcontractor.Thismanualisdesignedtoprovidegeneral
guidelinesandrecommendationsonly.Itisnotintendedtobeacompletemanualforair
conditioningdesign.

REFRIGERATIONPIPINGRECOMMENDATIONS
UNDERGROUNDREFRIGERANTPIPING

Caution:

Undergroundcondenserrefrigerantpipingisnotrecommended.
Improperinstallationofacondensingunitwithundergroundpipingwillresultin
equipmentfailure.
ConsultFactoryonallsystemswithundergroundrefrigerantpiping.
Undergroundpipingwillvoidcompressorwarrantyunlessspecificallyauthorizedby
EngineeredAir.

Intheoffcycle,therefrigerantchargewillmigratetothecoldestlocation.Typically,groundtemperatures
arecoolerthanairtemperatures,andtheundergroundpipingbecomesthecoolestlocation.Inthiscase
therefrigerantchargewillmigratetoundergroundpiping.Whenthecompressorstarts,anyliquid
refrigerantinthedischargelinecouldcausenuisancetrippingonhighheadpressure.