Daikin Enfinity VFC - Unit Installation; Ductwork and Attenuation; Discharge Ducting; Return Air Ducting

unit installation
www.DaikinApplied.com 7 EnnityVerticalWaterSourceHeatPumps• IM 930-6
Ductwork and Attenuation
Dischargeductworkisnormallyusedwiththeseunits.
Wherereturnairductworkisrequired,theunitis
suppliedwitha1"lterrack/ductcollarforconnectionof
returnairductwork.Anoptional2"returnairductcollar
lterrackisavailableasaeld-installedaccessoryor
afactory-installed,selectableoption.The2"lterrack
allowstoollessentryforeasylterreplacement.
Figure 4: Sizes 007 thru 070 Optional 2" Return Air Duct
Collar Filter Rack
Discharge Ducting
Allductworkshouldconformtoindustrystandardsof
goodpracticeasdescribedinASHRAESystemsGuide.
Aeldsupplieddischargeductsystemwillnormally
consistofaexibleconnectorattheunit,anon-insulated
transitionpiecetothefullductsize,ashortrunofduct,
anelbowwithoutvanes,andatrunkductteeinginto
abranchcircuitwithdischargediffusersasshownin
Figure5.
Figure 5: Suggested Unit Ducting
SquareElbow
(BothSides
InternallyLined
WithAcoustic
Insulation)
Trunk Duct
2ft.x2ft.Diffuser
DischargeCollar
HeatPump
Duct
Transition
BranchDuct
(InternallyLined)
Flexible
Duct Collar
Thetransitionpiecemustnothaveananglegreaterthan
30°orseverelossofairperformancecanresult.Do
notconnectthefullductsizetotheunitwithoutusinga
transitionpiecedowntothesizeofthedischargecollar
ontheunit.Withmetalductmaterial,thesidesofthe
elbowandentirebranchductshouldbeinternallylined
withacousticinsulationforsoundattenuation.Glass
berductboardmaterialismoreabsorbingandmay
permitomissionoftheexibleconnector.
Theductworkshouldbelaidoutsothatthereisnoline
ofsightbetweentheunitdischargeandthedistribution
diffusers.
Return Air Ducting
Returnairductscanbebroughtinthroughawallgrille
andthentotheunit.Thereturnductsystemwillnormally
consistofaexibleconnectorattheunitandatrunk
ducttothereturnairgrille.Withmetalductmaterial,the
returnairductshouldbeinternallylinedwithacoustic
insulationforsoundattenuation.Glassberductboard
materialismoreabsorbingandmaypermitomissionof
theexibleconnector.
Returnairductworktotheunitrequiresthe1"(25mm)
standardreturnairductcollarortheoptional2"(51mm)
lterrackkit(seeFigure4).The2"lterrackkitallows
forsidelterremoval.Aexibleductcollarcanthen
beattachedbetweenaducttransitionandthereturn
airductwork.Thereturnairducttransitionmustbethe
samesizeasthereturnaircoilfacearea.
Connectionsofsupplyandreturnairductworkshouldbe
madeattheductcollaroftheunit.Donotpuncturethe
unitcabinetwithsheetmetalscrewsasthiscandamage
thedrainpanorthecoil.
Figure 6: Suggested Return Air Unit Ducting
FlexibleDuctCollar
FullVibrationIsolationPad
TransitionDuct
DischargeDuct
Flexible
Duct Collar