Daikin Enfinity VFC Manual

Installation and Maintenance Manual IM 930-6
Group: WSHP
Part Number: 910157591
Date: September 2014
Ennity™ Vertical Water Source Heat Pumps
Model VFC Standard Range & VFW Geothermal
Unit Sizes 009 – 070 / R-410A Refrigerant
People and ideas you can trust.™

Contents
www.DaikinApplied.com 3 EnnityVerticalWaterSourceHeatPumps• IM 930-6
Model Nomenclature ..........................4
Receiving and Storage.........................5
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Locating The Unit .............................6
Unit Installation...............................7
Ductwork and Attenuation ......................7
DischargeDucting............................7
ReturnAirDucting ............................7
VentilationAir ...............................8
Cleaning&FlushingWaterSystem...............8
OperatingLimits .............................9
AntifreezeCorrectionFactors ...................9
Piping ....................................10
ElectricalConnections........................11
MicroTech®III Unit Controller ..................12
I/OExpansionModule........................16
MicroTechIIIControllerWithLonWorks®
Communication Module ......................18
MicroTechIIIControllerwithBACnetCommunication
Module ...................................19
Prior To Start-up .............................21
ChangingPSCFanMotorSpeed...............21
Start-up ....................................23
Typical Wiring Diagrams ......................24
MicroTechIIIUnitController(Standalone)–
208/230/460/575/60Hz/3-Phase ................24
MicroTechIIIUnitControllerwithOptionalECM
Motor,DesuperheaterandI/OExpansionModule-
208/230/265/277/60Hz/1-Phase ...............25
MicroTechIIIUnitControllerwithOptionalECMMotor,
Desuperheater,ElectricHeatCoil&I/OExpansion
Module–208/230/460/60Hz/3-Phase ...........26
MicroTechIIIUnitControllerwithOptionalECM
Motor,Desuperheater,andI/OExpansionModule
208/230/460/60/3-Phase......................27
MicroTechIIIUnitControllerwithPSCMotor,
DesuperheaterandI/OExpansionModulefor
HotGasReheatControl(UnitSizes019-070)
208/230/60/1-Phase .........................28
Thermostat Connections ......................29
7-DayProgrammableElectronicThermostat(P/N
668375301) ................................29
Non-ProgrammableElectronicThermostat(P/N
668375401) ................................29
OptionalRemoteSensor(P/N66720401) ........29
MicroTechIIIWall-MountedRoomTemperature
Sensors(KitP/N669529101,669529201,
669529001) ................................30
WiringSensorstotheMicroTechIIIUnitController . 30
Additional Accessories – General ..............31
MotorizedIsolationValve&Relay...............31
PumpRestartRelayKitP/N061419001..........31
MultipleUnitControl(upto3units)
(P/N056794201) ...........................31
HotGas/WaterReheatDehumidication(Option)
(UnitSizes019–070)........................32
Desuperheater(Option)ForVFC/VFW(019-070) ..32
Troubleshooting ............................33
TheinandoutsofR-410A ....................33
Lubrication.................................33
Charging ..................................33
General Maintenance .........................33
MicroTechIIIUnitControllerLEDFaults ..........34
Typical Refrigeration Cycles ...................37
General Use and Information ..................38
WaterSourceHeatPumpEquipmentCheck,Testand
StartForm .................................39

Model noMenClature
Category Code Item Code Option Code Designation & Description
Product Category 01 1 W = WaterSourceHeatPump
Product Identier 02 2-4 VFC = R410A,FloorMounted,StandardRange   
   VFW = R410A,FloorMounted,GeothermalRange  
Design Series (Vintage) 03 5 1=ADesign
2 = BDesign
   3 = CDesign
   4 = DDesign
Nominal Capacity 04 6-8 009 = 9,000BtuhNominalCooling
012 = 12,000BtuhNominalCooling
   015 = 15,000BtuhNominalCooling
019 = 19,000BtuhNominalCooling
   024 = 24,000BtuhNominalCooling
   030 = 30,000BtuhNominalCooling
036 = 36,000BtuhNominalCooling
042 = 42,000BtuhNominalCooling
048 = 48,000BtuhNominalCooling
060 = 60,000BtuhNominalCooling
070 = 70,000BtuhNominalCooling
Controls 05 9 B=MicroTech®IIIUnitController
C= MicroTechIIIUnitControllerw/LonWorks®Communication Module
D=MicroTechIIIUnitControllerw/BACnet®CommunicationModule
F = MicrotechIIIUnitControllerw/BACnetCommModule-WSHPSystem
Voltage 06 10 A=115-60-1(Sizes007-012only)
E = 208-230/60/1
J = 265/277-60-1
F = 208-230/60/3
K = 460/60/3*
   L = 575/60/3
Return Air 08 12 L = Left
 R = Right
Discharge Air 09 13 T =  Top
Blower Motor 10 14-15 04 = ECM
Construction Type 12 18 B = Standardw/2"FilterRack
   C = Standardw/CompressorSoundBlanket
   D = Standardw/CompressorSoundBlanketand2"FilterRack
   F = IndoorAirQuality(IAQ)w/2"FilterRack
   G = IndoorAirQuality(IAQ)w/CompressorSoundBlanket
   H = IndoorAirQuality(IAQ)w/CompressorSoundBlanketand2"FilterRack
Heating Options 14 20 A = 5.0kWElectricHeat
   B = 10.0kWElectricHeat
Dehumidication 15 21-22 AA = HotGasReheatCoil
Desuperheater 19 30-32 DSH = Desuperheater
Refrigerant 20 33 A = R410A     
Cabinet Electrical 22 35-37 75VA = 75VAControlTransformer   
Water Flow Control 23 38 C = 2-WayMotorized1/2"IsolationValve,GeneralClose-OffPressureN.C.
V = 2-WayMotorized1/2"IsolationValve,GeneralClose-OffPressureN.O.
   H = 2-WayMotorized1/2"IsolationValve,HighClose-OffPressureN.C. 
D = 2-WayMotorized3/4"IsolationValve,GeneralClose-OffPressureN.C.
K = 2-WayMotorized3/4"IsolationValve,GeneralClose-OffPressureN.O.
   J = 2-WayMotorized3/4"IsolationValve,HighClose-OffPressureN.C.
Color 24 39 A = AntiqueIvoryPre-Paint     
Y = None
Notes: * A 460 volt, 3-phase unit that utilize an ECM fan motor will need a 4-wire WYE voltage supply with 3 hot leads and
a neutral wire. To power the ECM motor with neutral and one hot for 277/60/1 voltage to the ECM motor.
IM 930-6 •EnnityVerticalWaterSourceHeatPumps 4 www.DaikinApplied.com

reCeiving and storage
www.DaikinApplied.com 5 EnnityVerticalWaterSourceHeatPumps• IM 930-6
Sharpedgescancausepersonalinjury.Avoidcontactwiththem.
Usecareandwearprotectiveclothing,safetyglassesandgloves
whenhandlingpartsandservicingheatpumps.
CAUTION
Uponreceiptoftheequipment,checkcartonforvisible
damage.Makeanotationontheshipper’sdelivery
ticketbeforesigning.Ifthereisanyevidenceofrough
handling,immediatelyopenthecartonstocheckfor
concealeddamage.Ifanydamageisfound,notify
thecarrierwithin48hourstoestablishyourclaimand
requesttheirinspectionandareport.TheWarranty
ClaimsDepartmentshouldthenbecontacted.
Donotstandortransportthemachinesonend.For
storing,eachcartonismarkedwith“up”arrows.
Intheeventthatelevatortransfermakesup-ended
positioningunavoidable,donotoperatethemachine
untilithasbeeninthenormaluprightpositionforatleast
24hours.
Temporarystorageatthejobsitemustbeindoor,
completelyshelteredfromrain,snow,etc.Highorlow
temperaturesnaturallyassociatedwithweatherpatterns
willnotharmtheunits.Excessivelyhightemperatures,
140°F(60°C)andhigher,maydeterioratecertainplastic
materialsandcausepermanentdamage.
IMPORTANT
Thisproductwascarefullypackedandthoroughlyinspected
beforeleavingthefactory.Responsibilityforitssafedelivery
wasassumedbythecarrieruponacceptanceofthe
shipment.Claimsforlossordamagesustainedintransit
mustthereforebemadeuponthecarrierasfollows:
VISIBLE LOSS OR DAMAGE
Anyexternalevidenceoflossordamagemustbenoted
onthefreightbillorcarrier’sreceipt,andsignedbythe
carrier’sagent.Failuretoadequatelydescribesuchexternal
evidenceoflossordamagemayresultinthecarrier’s
refusaltohonoradamageclaim.Theformrequiredtole
suchaclaimwillbesuppliedbythecarrier.
CONCEALED LOSS OR DAMAGE
Concealedlossordamagemeanslossordamagewhich
doesnotbecomeapparentuntiltheproducthasbeen
unpacked.Thecontentsmaybedamagedintransitdue
toroughhandlingeventhoughthecartonmaynotshow
externaldamages.Whenthedamageisdiscoveredupon
unpacking,makeawrittenrequestforinspectionbythe
carrier’sagentwithinfteen(15)daysofthedeliverydate
andleaclaimwiththecarrier.
Pre-Installation
WARNING
The installer must determine and follow all applicable codes
andregulations.Thisequipmentpresentshazardsofelectricity,
rotatingparts,sharpedges,heatandweight.Failuretoreadand
followtheseinstructionscanresultinpropertydamage,severe
personal injury or death. This equipment must be installed by
experienced,trainedpersonnelonly.
1. Topreventdamage,donotoperatethisequipment
forsupplementaryheatingandcoolingduringthe
constructionperiod.
2. Inspectthecartonforanyspecictaggingnumbers
indicatedbythefactoryperarequestfromthe
installingcontractor.Atthistimethevoltage,phase
andcapacityshouldbecheckedagainsttheplans.
3. Checktheunitsizeagainsttheplanstoverifythat
theunitisbeinginstalledinthecorrectlocation.
4. Beforeinstallation,checktheavailablecloset
dimensionsversusthedimensionsoftheunit.
5. Notethelocationandroutingofwaterpiping,
condensatedrainpiping,andelectricalwiring.The
locationsoftheseitemsareclearlymarkedon
submittaldrawings.
6. Theinstallingcontractorwillnditbenecialto
conferwithpiping,sheetmetal,andelectrical
foremenbeforeinstallinganyunit.
Note: Check the unit data plate for correct voltage with
the plans before installing the equipment. Also,
make sure all electrical ground connections are
made in accordance with local code.
7. Thecontractorshallcovertheunitstoprotectthe
machinesduringnishingofthebuilding.Thisis
criticalwhilesprayingreproongmaterialonbar
joists,sandblasting,spraypaintingandplastering.
8. Theoverallopeningofthedoorwaytomechanical
roommustbe2"widerthantheunitforeasy
installationand/orremoval.
Table 1: Overall Unit Dimensions
Unit Size Dimensions
009 – 012 22¼"Dx20"Wx37"H
015 – 024 24¼"Dx23"Wx46½"H
030 – 036 24¼"Dx23"Wx50½"H
042 – 048 32½"Dx25"Wx46½"H
060 – 070 32½"Dx25"Wx58½"H
Note: Dimensions are approximate.

loCating the unit
IM 930-6 •EnnityVerticalWaterSourceHeatPumps 6 www.DaikinApplied.com
1. Locatetheunitinanareathatallowsforeasy
removalofthelterandaccesspanels,andhas
enoughspaceforservicepersonneltoperform
maintenanceorrepair.Providesufcientroomto
makewater,electricalandductconnections.
2. Makesurethatsufcientaccesshasbeenprovidedfor
installingtheunit,includingclearanceforductcollars
andttingsatwaterandelectricalconnections.
3. Allowadequateroomaroundtheunitfora
condensatepiping.
4. Theunitcanbeinstalled“freestanding”inan
equipmentroom.However,closetinstallationsare
morecommonforsmallverticaltypeunits.
Generally,theunitislocatedinthecornerofacloset
withthenon-ductedreturnairfacing90°tothedoorand
themajoraccesspanelsfacingthedoorasinFigure1.
Alternatively,theunitcanhaveaductedreturnairwith
theopeningfacingthedoorandthemajoraccesspanels
facing90°tothedoorasinFigure2.
5. Unitmustbelocatedontopofavibrationabsorbing
materialsuchasarubber(Isolationpad)thatis
thesamesizeasthebaseoftheunit,tominimize
vibrationandnoise.SeeFigure9onpage10.
Minimum distance requirement from
return air duct collar to wall for non-
ducted units.
Model Distance
009–012....................... 5inches
015–024....................... 5inches
030–036....................... 6inches
042–048....................... 8inches
060–070..................... 10inches
Figure 1: Typical closet installation with louver door return
(non-ducted)
ReturnAirThru
LouveredDoor
ReturnAirThru
LouveredDoor
Return
Air
Risers
Left-HandReturnAir
Arrangement
Right-HandReturnAir
Arrangement
Return
Air
A Condensate
B DesuperheaterWaterReturn(Optional)
C DesuperheaterWaterSupply(Optional)
D WaterReturn
E WaterSupply
Figure 2: Typical closet installation with ducted return
HeatPumpwith
Right-HandReturnAir
Arrangement
HeatPumpwith
Left-HandReturnAir
Arrangement
Return
Air
Duct&
Grille
Return
Air
Duct&
Grille
Risers
A Condensate
B DesuperheaterWaterReturn(Optional)
C DesuperheaterWaterSupply(Optional)
D WaterReturn
E WaterSupply
F LowVoltageControlWiring(ElectricEntrance)
G LineVoltageUnitPower(ElectricEntrance)
Figure 3: Unit Electrical and Piping Locations
ControlAccessPanel

unit installation
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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

unit installation
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Ventilation Air
Outsideairmayberequiredforventilation.The
temperatureoftheventilationairmustbecontrolledso
thatmixtureofoutsideairandreturnairenteringthe
unitdoesnotexceedapplicationlimits.Itisalsogeneral
practicetocloseofftheventilationairsystemduring
unoccupiedperiods(nightsetback).
Theventilationairsystemisgenerallyaseparate
buildingsubsystemwithdistributionductwork.Toprovide
thoroughmixingoftheoutsideandreturnair,introduce
theoutsideairincloseproximitytothereturnairplenum
inlet.Donotductoutsideairdirectlytotheunitinlet.See
"OperatingLimits"onpage9.
Priortomakingpipingconnections, contractor must clean and
ushwaterloopsystem.Failuretoclean/ushsystemmayresult
innuisancetrippingandprematurecomponentfailure.
CAUTION
Cleaning & Flushing Water System
1. Priortorstoperationofanyunit,thewater
circulatingsystemmustbecleanedandushedof
allconstructiondirtanddebris.
Iftheunitsareequippedwithwatershutoffvalves,
eitherelectricorpressureoperated,thesupplyand
returnrunoutsmustbeconnectedtogetherateach
unitlocation.Thiswillpreventtheintroductionofdirt
intotheunit.SeeFigure7.
Figure 7: Connect the runouts together
Return Runout
SupplyRunout
Mains
FlexibleHose
RunoutsInitially
ConnectedTogether
2. Fillthesystematthecitywatermakeupconnection
withallairventsopen.Afterlling,closeallairvents.
Thecontractorshouldstartmaincirculatorwith
thepressurereducingvalveopen.Checkvents
insequencetobleedoffanytrappedair,ensuring
circulationthroughallcomponentsofthesystem.
Powertotheheatrejectorunitshouldbeoff,andthe
supplementaryheatcontrolsetat80°F(27°C).
Whilecirculatingwater,thecontractorshouldcheck
andrepairanyleaksintheunitandsurroundingpiping.
Drainsatthelowestpoint(s)inthesystemshouldbe
openedforinitialushandblow-down,makingsurecity
waterllvalvesaresettomakeupwateratthesame
rate.Checkthepressuregaugeatpumpsuctionand
manuallyadjustthemakeuptoholdthesamepositive
steadypressurebothbeforeandafteropeningthedrain
valves.Flushshouldcontinueforatleasttwohoursor
longeruntilthedrainwateriscleanandclear.
Unitsmustbecheckedforwaterleaksuponinitialwatersystem
start-up.Waterleaksmaybearesultofmishandlingordamage
duringshipping. Failureby theinstallingcontractortocheckfor
leaksuponstart-upofthewatersystemcouldresultinproperty
damage.
CAUTION
3. Shutoffsupplementalheaterandcirculatorpump
andopenalldrainsandventstocompletelydrain
downthesystem.Shortcircuitedsupplyandreturn
runoutsshouldnowbeconnectedtotheunitsupply
andreturnconnections.Donotusesealersatthe
swivelareconnectionsofhoses.
4. Flushsystemwithwaterfor2hoursorlongeruntil
waterisclean.
5. Rellthesystemwithcleanwater.Testthewater
usinglitmuspaperforacidity,andtreatasrequired
toleavethewaterslightlyalkaline(pH7.5to8.5).
Thespeciedpercentageofantifreezemayalsobe
addedatthistime.Usecommercialgradeantifreeze
designedforHVACsystemsonly.Donotuse
automotivegradeantifreeze.
Oncethesystemhasbeenlledwithcleanwater
andantifreeze(ifused),precautionsshould
betakentoprotectthesystemfromdirtywater
conditions.
Note: Contact a local water treatment company to con-
rm water clarity prior to unit operation.
Dirtywaterwillresultinsystemwidedegradation
ofperformanceandsolidsmayclogsystem-wide
valves,strainers,owregulators,etc.Additionally,the
heatexchangermaybecomecloggedwhichreduces
compressorservicelifeorcausesprematurefailure.
6. Settheloopwatercontrollerheataddsetpoint
to70°F(21°C)andtheheatrejectionsetpointto
85°F(29°C).Supplypowertoallmotorsandstart
thecirculatingpumps.Afterfullowhasbeen
establishedthroughallcomponentsincludingthe
heatrejector(regardlessofseason)andthevented
airandlooptemperatureshavebeenstabilized,
eachoftheunitswillbereadyforcheck,testand
start-up,airbalancing,andwaterbalancing.

unit installation
Operating Limits
Thisequipmentisdesignedforindoorinstallationonly.Shelteredlocationssuchasattics,garages,etc.,generally
willnotprovidesufcientprotectionagainstextremesintemperatureand/orhumidity,andequipmentperformance,
reliability,andservicelifemaybeadverselyaffected.
Table 2: Air limits in °F (°C)
Air Limits Standard Range Units Geothermal Range Units
Cooling Heating Cooling Heating
Minimum Ambient Air 50°F(10°C) 50°F(10°C) 40°F(4°C) 40°F(4°C)
Rated Ambient 80°F(27°C) 70°F(21°C) 80°F(27°C) 70°F(21°C)
Maximum Ambient Air 100°F(38°C) 85°F(29°C) 100°F(38°C) 85°F(29°C)
Minimum Entering Air 50°F(10°C) 50°F(10°C) 50°F(10°C) 40°F(4°C)
Rated Entering Air 80/67°F(27°/19°C) 70°F(21°C) 80/67°F(27°/19°C) 70°F(21°C)
Maximum Entering Air 100/83°F(38/28°C) 80°F(27°C) 100/83°F(38/28°C) 80°F(27°C)
Table 3: Water limits
Water Limits Standard Range Units Geothermal Range Units
Cooling Heating Cooling Heating
Minimum Entering Water 55°F(13°C) 55°F(13°C) 30°F(-1°C) 20°F(-6°C)
Normal Entering Water 85°F(29°C) 70°F(21°C) 77°F(25°C) 40°F(4°C)
Maximum Entering Water 110°F(43°C) 90°F(32°C) 110°F(43°C) 90°F(32°C)
Minimum GPM/Ton 1.5
Nominal GPM/Ton 3.0
Maximum GPM/Ton 4.0
Notes: 1. Maximum and minimum values may not be combined. If one value is at maximum or minimum, the other two
conditions may not exceed the normal condition for standard units. Extended range units may combine any two
maximum conditions, but not more than two, with all other conditions being normal conditions.
2.This is not a normal or continuous operating condition. It is assumed that such a start-up is for the purpose of
bringing the building space up to occupancy temperature.
Antifreeze Correction Factors
Table 4: Ethylene Glycol
10% 20% 30% 40% 50%
Cooling Capacity 0.9950 0.9920 0.9870 0.9830 0.9790
Heating Capacity 0.9910 0.9820 0.9770 0.9690 0.9610
Pressure Drop 1.0700 1.1300 1.1800 1.2600 1.2800
Table 5: Propylene Glycol
10% 20% 30% 40% 50%
Cooling Capacity 0.9900 0.9800 0.9700 0.9600 0.9500
Heating Capacity 0.9870 0.9750 0.9620 0.9420 0.9300
Pressure Drop 1.0700 1.1500 1.2500 1.3700 1.4200
Table 6: Methanol
10% 20% 30% 40% 50%
Cooling Capacity 0.9980 0.9720 – – –
Heating Capacity 0.9950 0.9700 – – –
Pressure Drop 1.0230 1.0570 – – –
Table 7: Ethanol
10% 20% 30% 40% 50%
Cooling Capacity 0.9910 0.9510 – – –
Heating Capacity 0.9950 0.9600 – – –
Pressure Drop 1.0350 0.9600 – – –
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Piping
1. Allunitsshouldbeconnectedtosupplyandreturn
pipinginatwo-pipereversereturnconguration.A
reversereturnsystemisinherentlyself-balancing
andrequiresonlytrimbalancingwheremultiple
quantitiesofunitswithdifferentowandpressuredrop
characteristicsexistinthesameloop.Checkforproper
waterbalancebymeasuringdifferentialtemperature
readingacrossthewaterconnections.Forproper
waterow,thedifferentialtemperatureshouldbe12°F
to14°F(5°Cto8°C)forunitsincoolingmode.
Adirectreturnsystemmayalsowork,butproperwater
owbalancingismoredifculttoachieveandmaintain.
2. Thepipingcanbesteel,copperorPVC.
Note: If using PVC (schedule-40) construction grade
pipe or better, use the manufacturers recom-
mended high temperature adhesive. With PVC
piping the appropriate number of hanger brackets
must be used to help prevent sagging.
3. Supplyandreturnrunoutsusuallyjointheunitviashort
lengthsofhighpressureexiblehosewhicharesound
attenuatorsforbothunitoperatingnoiseandhydraulic
pumpingnoise.Oneendofthehoseshouldhave
aswivelttingtofacilitateremovalforservice.Hard
pipingalsocanbebroughtdirectlytotheunit.This
optionisnotrecommendedsincenovibrationornoise
attenuationcanbeaccomplished.Thehardpiping
musthaveunionstofacilitateunitremoval.SeeFigure
8,Figure9,andFigure10fortypicalpipingdetails.
Figure 8: Typical Vertical Unit Piping
4. Someexiblehosethreadedttingsaresuppliedwith
sealantcompound.Ifnot,applyTeontapeforatightseal.
5. Supplyandreturnshutoffvalvesarerequiredat
eachunit.Thereturnvalveisusedforbalancingand
shouldhavea“memorystop”sothatitcanalways
beclosedoffbutcanonlybereopenedtotheproper
positionfortheowrequired.
6. Donotconnectanyunittothesupplyandreturnpiping
untilthewatersystemhasbeencleanedandushed
completely.Afterthecleaningandushinghastaken
place,theinitialconnectionshouldhaveallvalveswide
openinpreparationforwatersystemushing(see
"Cleaning&FlushingWaterSystem"onpage8).
7. Condensatepipingcanbesteel,copperorPVC.
Eachunitincludesacondensateconnection.
8. Unitsareinternallytrapped.
9. Donotlocateanypointinthedrainsystemabove
thedrainconnectionofanyunit.
10. Automaticowcontrolleddevicesmustnotbe
installedpriortosystemcleaningandushing.
11. Ahighpointofthepipingsystemmustbevented.
12. Checklocalcodefortheneedfordielectricttings.
Note: Do not over-torque ttings. The maximum torque
without damage to ttings is 30 foot pounds. If a
torque wrench is not available, use as a rule of
thumb, nger-tight plus one quarter turn.
Figure 9: Typical Vertical Installation and Unit Piping
1 SupplyAirDucting
2 AcousticalThermalLining(10ft.)
3 LineVoltage-7/8"(22mm)Hole
4 LowVoltage-7/8"(22mm)Hole
5 FlexibleDuctCollar
6 LouveredDoorforReturnAir
7 CondensateDrainConnection
8 FlexibleReturnHosewithFlowController/BallValve(3/4"FPT)
9 FlexibleSupplyHosewithY-Strainer/BallValve(3/4"FPT)
10 AccessPaneltoController
11 LEDAnnunciatorStatusLights
12 VibrationIsolationPad