Nibe IEC VDY Instruction manual

•
 EnergyEfcient
•
 EasytoInstall
•
 ExtendedServiceLife
HorizontalandVertical
DirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
- Energyefcientcompactblowercoils
- Idealforeducational,hospitality,multi-family,orothercommercialenvironments
- Designedforductedapplications
- NominalCFMrangeof600to3,000CFM
HDY
VDY

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
2
Itistheresponsibilityoftheendusertoproperlycharacterizeand
disposeofallwastematerialsaccordingtoapplicableregulatory
and legal entities. Where reasonable, safe, and compliant with
localregulatoryandlegalrequirements,IECencouragesrecycling
materialswhendisposingofitsproducts.
InternationalEnvironmentalCorporation(IEC)workscontinually
toimproveitsproducts.Asaresult,thedesignandspecications
ofeachproductmaybechangedwithoutnoticeandmaynotbe
asdescribedherein.PleasecontactIECforinformationregarding
currentdesignandproductspecications.Statementsandother
informationcontainedhereinarenotexpresswarrantiesanddonot
formthebasisofanybargainbetweenthepartiesbutaremerely
IEC’s opinionorcommendationofitsproducts.Manufacturer’s
standardlimitedwarrantyapplies.

Horizontal and Vertical Direct Drive Blower Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
3
14 Control Board Adjustment
15 Water Balancing System
15 Water Treatment
16 Electronically Commutated
Motor (ECM)
SECTION FIVE — Service/Maintenance
16 General
16 Motor/Blower Assembly
16 Bipolar Ionizer Brush Cleaning
17 Coils
17 Electric Resistance Heater Assembly
17 Cabinet/Control Box Maintenance
Light – HDY
17 Electrical Wiring and Controls
18 Drain
18 Filters, Throwaway
18 Filters, Replacement, Installation
21 Piping Connection Location
23 Electric Heater Data
24 Motor Performance Data
25 Appendix I –Typical Wiring
Diagram Examples
37 Equipment Installation and
Start-Up Checklist
38 Replacement Parts
38 Factory Recommended Spare
Parts List
39 Terms and Conditions
SECTION ONE — Preface
4 Introduction
4 Safety
SECTION TWO — Pre-Installation
5Unpacking and Inspection
5Prepare Job Site for Unit Installation
5Identify and Prepare Units
6 Protect Units from Damage
SECTION THREE — Installation
6 Horizontal & Vertical Units (Standard)
8Total Weight Unit Correction
Factor (lb)
9Mixing Box Installation
10 Inlet and Outlet Dampers Installation
11 Cooling/Heating Pipe Connections
11 Leak Testing
11 Refrigerant Coil Testing
11 Piping Insulation
11 Condensate Drain
11 Condensate Float Switch
12 Maximum External Static Pressures
12 Electrical Connections
12 Connecting Ductwork
12 Make Final Preparations
SECTION FOUR — Start-Up
13 Cooling/Heating System
13 Direct Expansion (DX) System
14 Air Balance System
TableofContents

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
4
Introduction
InternationalEnvironmentalCorporation(IEC)fancoil
unitsrepresentaprudentinvestmentofferingtrouble-
freeoperationandlongservicewithproperinstallation,
operation,andregularmaintenance.Theequipment
coveredbythismanualisavailablewithavarietyof
optionsandaccessories.Alwaysconsulttheapprovedunit
submittals,orderacknowledgement,andothermanuals
forspecicdetailsonunitoptionsandaccessories.Always
followproperproceduresrelatedtosafety,handling,
installation,operation,andservicingofmechanical
equipmentasthemanufacturerassumesnoresponsibility
forpersonalinjuryorpropertydamageresultingfrom
improperorunsafepracticesduringthehandling,
installation,service,oroperationofanyequipment.
Safety
IECequipmentisinitiallyprotectedunderthe
manufacturer’sstandardwarranty;however,thiswarranty
isprovidedundertheconditionthatthestepsoutlined
inthismanualforinitialinspection,properinstallation,
commissioning,regularperiodicmaintenance,and
everydayoperationoftheequipmentbefollowedindetail.
Thismanualshouldbefullyreviewedandunderstoodin
advanceofinitialinstallation,startup,andanymaintenance.
Shouldanyquestionsarise,pleasecontactyourlocalSales
RepresentativeorthefactoryBEFOREproceeding.
WARNING: NO ATTEMPT SHOULD BE MADE TO
HANDLE, INSTALL, OR SERVICE ANY UNIT WITHOUT
FOLLOWING SAFE PRACTICES REGARDING
MECHANICAL EQUIPMENT.
Alwaysuseproperequipmentsupport.Secureallpre-
installationsupports.
CAUTION: Disconnect all power prior to any
installation or service (unit may use more than
one power source; ensure all are disconnected) Power
to remote mounted control devices may not be
supplied by unit.
Children should be supervised so they do not play with
the appliance.
SECTIONONE—Preface
CAUTION: Electric shock can cause death.
CAUTION: Observe all warnings and precautions
marked on the equipment.
InstallapprovedLock-Out/Tag-Outprotectiondeviceson
ALLincomingpowersourcestoequipmentbeing installed
orservicedpriortobeginninganywork.Alwaysverify
allincomingpowersourcesarede-energizedusingan
electricalmulti-meter.
CAUTION: Never wear bulky or loose tting
clothing when working on any mechanical
equipment. Gloves should always be worn for
protection against sharp sheet metal edges, heat, and
other possible injuries. Safety glasses or goggles
should always be worn, especially when drilling,
cutting, or working with refrigerants, lubricants or
cleaning chemicals.
WARNING: Never pressurize any equipment beyond
specied test pressures listed on the unit rating plate.
Always pressure test with an inert uid or gas such as
clear water or dry nitrogen to avoid possible damage
or injury in the event of a leak or component failure
during testing.
CAUTION: Always protect adjacent ammable
material when welding or soldering. Use a
suitable heat shield material to contain sparks or drops
of solder. Have a re extinguisher readily available.
CAUTION: Always protect chilled and hot
water valve bodies, strainers, ball valves, and
other ow control related devices from heat caused by
soldering or brazing processes.
Safetyshouldalwaysberstprioritywhenhandling,
installing,operatingorservicingmechanicalequipment.
Alwaysfollowallsafetycodes,proceduresandprotocols.
ConsultapplicablelocalbuildingcodesandNational
ElectricalCodes(NEC)forspecialrequirements.Bealert
tosafetyinformation:symbols,wordssuchasDANGER,
WARNINGandCAUTION.

Horizontal and Vertical Direct Drive Blower Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
5
SECTIONTWO—Pre-Installation
SECTION2–Pre-Installation
Unpacking and Inspection
Allunitsarecarefullyinspectedatthefactorythroughout
themanufacturingprocessunderastrictdetailedquality
assuranceprogram.Allmajorcomponentsandsub-
assembliesarecarefullytestedforproperoperation
andveriedforfullcompliancewithfactorystandards.
Operationaltestingofsomecustomer-furnished
componentssuchasDDCcontrols,pneumaticcontrol
valvesandswitchesmaybeapossibleexception.
Eachunitiscarefullypackagedforshipmenttoprevent
damageduringnormaltransitandhandling.Equipment
shouldalwaysbestoredinadryandcoveredplace,andin
properorientationmarkedonthecarton.
AllshipmentsaremadeF.O.B.ex-factoryanditisthe
responsibilityofthereceivingpartytoinspectthe
equipmentuponarrival.Anyobviousdamagetothe
packagingand/oritscontentsshouldberecordedonthe
billofladingandaclaimledwiththefreightcarrier.
Afterinspectingconditionofpackagingexterior,
carefullyremoveeachunitfromthecartonandinspect
forhiddendamage.Anyhiddendamageormissing
componentsshouldberecordedandimmediately
reportedtothecarrierandaclaimled.Intheeventa
claimforshippingdamageisled,theunit,shipping
carton,andallpackingmustberetainedforphysical
inspectionbythefreightcarrier.Allequipmentmust
bestoredinthefactoryshippingcartonwithinternal
packinginplaceuntilinstallation.
Attimeofreceipt,equipmenttypeandarrangement
mustbeveriedbyreviewoforderdocuments.Should
anydiscrepancybefound,thelocalSalesRepresentative
mustbenotiedimmediatelysothatproperactionmay
betaken.
Shouldanyquestionsariseconcerningeldwarranty
repairs,factorymustbenotiedBEFOREanycorrective
actionistaken.
Whenrepairsoralterationscanbeaccomplishedlocally,
thefactorymustbefullyinformedoftheextentand
expectedcostofrepairsbeforeworkbegins.When
factoryoperationsarerequired,thefactorymustbe
contactedforauthorizationtoreturnequipmentanda
ReturnAuthorizationNumberwillbeissued.
Unauthorizedreturnshipmentsofequipmentand
shipmentsnotmarkedwithanauthorizationnumber
willberefused.Inaddition,anyclaimsforunauthorized
expenseswillnotbeacceptedbythemanufacturer.
Prepare Job Site for Unit Installation
Tosavetimeandtoreducethepossibilityofcostlyerrors,
setupacompletesampleinstallationinatypicalroomat
thejobsite.Checkallthecriticaldimensionssuchaseld
piping,wiring,andductconnectiontoensuretheyagree
withjobrequirements.Refertojobdrawingsandproduct
dimensiondrawingsasrequired(SeeFigures23-26for
sampledrawings).Instructalltradesintheirpartofthe
installation.Shouldanydiscrepanciesbediscovered,
contactyourlocalrepresentativebeforecontinuingwith
unitinstallations.
Identify and Prepare Units
Foreachunit,conrmincomingandcontrolpower
requirementsmatchavailablepowersource.Refertounit
nameplateandwiringdiagram.
1. Reviewalltagsonunittodetermineifshipping
screwsaretoberemoved.Removescrewsas
directed.
Improperinstallation,adjustment,service,maintenance,
orusecancauseexplosion,re,electricalshock,orother
conditions,whichmayresultinpersonalinjuryorproperty
damage.Thisproductmustbeinstalledonlybypersonnel
withthetraining,experience,skills,andapplicable
licensingthatmakeshim/her“aqualiedprofessional
HVACRinstaller”.

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
6
SECTIONTHREE—Installation
2. Rotatefanwheelbyhandtoensurethatfanis
unrestrictedandcanrotatefreely.Inspectfor
shippingdamageandfanobstructions.Adjust
blowerwheelasrequired.
Protect Units from Damage
Caremustbetakentoassurethatnoforceorpressure
isappliedtothecoil,pipingordrainstub-outsduring
handling.TheequipmentcoveredinthismanualIS
NOTsuitableforoutdoorinstallations.Theequipment
isnevertobestoredorinstalledwhereitmaybe
subjectedtoahostileenvironmentsuchasrain,snow,
orextremetemperatures.
Before,during,andafterinstallation,takespeciccaution
topreventforeignmaterialsuchaspaint,plaster,and
drywalldustfrombeingdepositedinthedrainpan,on
themotororblowerwheelsandcooling/heatingcoils.
Failuretodosomayhaveseriousadverseeffectsonunit
operation,andinthecaseofmotorandblowerassembly,
mayresultinimmediateorprematurefailureandvoiding
allmanufacturers’warranties.Someunitsand/orjob
conditionsmayrequiresomeformoftemporarycovering
duringconstruction.Whilethemanufacturerisnot
involvedinthedesignandselectionofsupportmethods
andcomponents,itshallbenotedthatunacceptable
systemoperatingcharacteristicsand/orperformancemay
resultfromimproperorinadequateunitstructuralsupport.
Aftermounting,theunitisthenreadyfortheservice
connectionssuchaswater,drainandelectrical.Verify
whichpropertypeofservicesareactuallyprovidedtothe
unit.Onunitsrequiringchilledwaterand/orhotwater,
verifyproperlinesizeandwatersupplyavailability.
SECTION3–Installation
Horizontal & Vertical Units (Standard)
Place Units In Position.
Installmixingboxwhenorderedwithunit.Followmixing
boxinstallationinstructionsoutlinedinthenextsection.
Thehorizontalblowercoilunitshave5/8"(15.88mm)
knockoutsineachcornerofthetopandbottompanels
for1/2"(12.70mm)allthread(notsuppliedwithunit)to
passthrough(seeFigure3).Alwayssupporttheunitat
thebaseuntilmountingiscomplete.
Sufcientclearancemustbekeptforserviceand
maintenance.Minimumrecommendedclearancefor
maintenanceofthemotorandblowerwheelis29"
(736.60mm)oneachside.Filterscanberemovedfrom
bothsidesandthebottom(HDY)ortop(VDY)ofthe
lterframe.Ifsideaccesstothelterisdesired,the
minimumclearancerequiredisthewidthofthelterrack
plus6"(154.40mm).
Aminimumof48"(121.92cm)clearanceisrequired
betweenfactorysuppliedelectricheaterandany
combustiblematerials.(SeeFigures1and2for
additionalclearancesinformation).
Fordrainpanremoval,therecommendedclearance
shouldbenolessthanthewidthoftheunit.
Theunitmustbemountedlevel.DONOTmountthe
unitonaslope.Thedrainpanhasabuilt-inslopeto
ensureproperdrainage.Mountingtheunitonaslope
mayresultinimproperdrainage.Field-furnishedand
installedaccessoriessuchasductwork,mixingboxes,
economizers,dampers,etc.mustbeindependently
supportedorsuspendedandmustnotrelyontheunit
forsupport.
Minimum recommended
clearance
Minimum recommended
clearance
Electric Heat Controls
AIRFLOW
AIRFLOW
Filter
Drain Pan
Electric Heat
Elements
29 in.
Minimum recommended
clearance 29 in. (736.60 mm)
29 in. Fan Motor Piping Package
Fan
Figure 1. HDY Unit installation –
recommended clearances (top view)

Horizontal and Vertical Direct Drive Blower Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
7
SECTIONTHREE—Installation,Cont’d.
Figure 3. HDY Threaded rod suspension
Isolators - 4 per unit
(eld furnished and
installed)
Washer and Double Nut (eld
furnished and installed)
5/8” (15.88 mm) knockouts
for suspension rods (4
places top and 4 places
bottom of unit)
Threaded Rod
Suspension (eld
furnished and installed)
Trapeze -
Recommended on
unit size 30
Figure 4. HDY Mounting details - threaded rod suspension
Washer
Double Nuts
Trapeze
Bolt
Figure 5. HDY Distributed weight calculations
AIRFLOW
MINIMUM RECOMMENED
29 IN.
(736.60 mm)
29 IN.
(736.60 mm)
MINIMUM RECOMMENED
29 IN. (736.60 mm)
MINIMUM RECOMMENED
FILTER
PIPING PACKAGE
CLEARANCE (†)
IOM-092 corrections 8.2.2023
CLEARANCE (†)
CLEARANCE (†)
Fordrainpanorcoilremoval,therecommendedclearanceshouldbeno
lessthanthewidthoftheunitplusconnections.
Figure 2. VDY Unit installation –
recommended clearances (top view)
HDY Unit No Electric Heat (lb.) With Electric Heat (lb.)
A B C D Total A B C D Total
06 42 46 36 47 171 42 58 36 66 202
08 41 47 38 45 171 41 58 36 67 202
10 51 53 49 63 217 51 60 56 83 250
12 50 52 51 64 217 50 58 57 85 250
16 65 70 64 75 274 70 69 66 104 309
20 78 90 77 95 340 81 96 77 107 378
22 83 105 80 99 367 86 111 81 111 389
30 103 113 97 117 430 104 120 96 149 469
Table 1. HDY Operating weight/Distributed weight values
Thefollowingoperatingweightinformationisbasedon8-rowwater-lledcoilsanddoublewallcabinetconstruction.
Foradifferentcoilandcabinetoption,usetheweightcorrectionfactortable.

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
8
SECTIONTHREE—Installation,Cont’d.
CD
AB B
DC
A
LH COIL RH COIL
Figure 6. VDY Distributed Weight Calculations
NOTE: Someunitcomponentsareremovedforclarity.
Table 2. VDY Operating weight/Distributed weight values
VDY Unit No Electric Heat (lb.) With Electric Heat (lb.)
A B C D Total A B C D Total
06 76 38 35 42 191 85 40 44 49 218
08 85 39 37 38 199 94 48 44 47 234
10 78 45 44 78 245 86 58 55 84 283
12 84 45 46 80 255 97 62 58 92 309
16 85 74 62 82 306 105 79 70 92 346
20 90 84 77 88 339 111 88 81 99 379
22 110 90 73 90 363 133 88 92 99 412
30 147 140 113 128 528 160 140 131 137 568
NOTE: 1. Unitweights(showninpounds),+/-10percent,arebasedonthelargestwater-filledcoil.
 2. Theoperatingweightinformationisbasedon8-rowwaterfilledcoilsanddoublewallcabinetconstruction.Fordifferentcoilandcabinetoptions,usetheweightadjustmenttable
(Table2).
Total Weight Unit Correction Factor (lb.)
Theweightsarefor8-rowwater-lledcoilsanddouble
wallconstruction.Foradifferentnumberofrows,total
unitweightcanbedeterminedby:
Totalunitweightcanbeadjustedby:
a. Identifythesizeofunitandnumberofrows
b. Fromtheprevioustable,identifythetotalweight
oftheunit
c. Fromthetablebelow,identifythecorrection
factoranddeductthisfactorfromthetotal
weight.
Table 3. Total unit weight adjustment – HDY and VDY
Options 6 8 10 12 16 20 30
4-RowCoil -21 -21 -28 -28 -39 -46 -98
5-RowCoil -16 -16 -21 -21 -29 -35 -74
6-RowCoil -11 -11 -14 -14 -20 -23 -49
7-RowCoil -5 -5 -7 -7 -10 -12 -25
SingleWall
Construction -31 -31 -40 -40 -47 -58 -67
NOTE: 1. Unitweights(showninpounds),+/-10percent,arebasedonthelargest
water-filledcoil.

Horizontal and Vertical Direct Drive Blower Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
9
SECTIONTHREE—Installation,Cont’d.
Mixing Box Installation
1. Mixingboxesarepre-assembledfromthefactory
foreaseofinstallation.Alinkagekitconsisting
oftwocrankarms,2swivels,andeithera25"
(635.00mm)(sizes06-16)ora34"(863.60mm)
(sizes20-30)lengthof5/16"(7.94mm)rodis
providedforfieldinstallationofanactuator.
Figure 7. Base rails
2. Assemblethebaserails(providedwithmixing
box).Allhardwarerequiredforassemblyis
includedandthebaserailsarelettercodedforease
ofassembly(asshowninFigure8).
Figure 8. Letter coding on base rail parts
3. Placeunitonthebaserails.Theninstallmixing
boxandattachtobaserailusingthe#8x1/2"
fasteners(HDY)or#12x3/4”fasteners(VDY)at
thelocationsshowninFigures9and10.
4. Sealtheconnectionbetweenthemixingboxand
thereturnductflange.Becarefulnottotapeorseal
thefilteraccesspanel.Forunitswith4”filters,the
mixingboxwillover-hangtheendbaserailby2”.
Figure 9. Horizontal units with mixing box option
DETAIL BDETAIL A
MOUNTING
LOCATION MOUNTING
LOCATION
Figure 10. VDY mixing box installation
SEE DETAIL A
DETAIL A

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
10
5. InstallSwivelstoCrankArms,handtighten.
Figure 12. Install swivels
SEE DETAIL A
DETAIL A
6. Insert5/16”(7.94mm)damperrodthrough
mountingholeofeachswivel,asshowin
Figure12.Positionshafttoensurethereisnot
interferenceatanypointduringtravel.Tightenrod
clampofswivelontoeachdamperrod.
Figure 13. Install damper
7. Conrmcorrectoperationofdampers.Adjustas
needed.Tightenremainingfasteners.
SECTIONTHREE—Installation,Cont’d.
Inlet and Outlet Dampers Installation
1. Installactuatorpermanufacter’sinstructions.
2. Adjustdampershaftsoutwardtoextendpastany
obstaclesthatmightcauseinterference.Donot
adjustinwardendofshaftwithinadistanceof2
inchofbronzebushing.
3. Positioninletdamperandoutletdamperto
coincidewithcurrentorintentedpositionof
actuatorarm,dependingonactuator’sposition
(opened/closed).Noterotationdirectionofeach
damper.
4. Installcrankarmstoeachdampershaft
approximatelyparalleltoeachotherwhile
maintainingstate/positionofdampers,asshowin
Figure11.Checkforrangeofmotionclearances
beforetightening.
Figure 11. Install crank

Horizontal and Vertical Direct Drive Blower Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
11
SECTIONTHREE—Installation,Cont’d.
Cooling/Heating Pipe Connections
CAUTION: Residue and loose particles resulting
from manufacturing and eld piping techniques
such as joint compounds, soldering ux, and metal
shavings may be present in the unit and the piping
system. Ensure system cleanliness when connecting to
solar, domestic or potable water systems.
Thoroughlyreviewsubmittalsandproductliterature
detailingunitoperation,controls,andconnections
BEFOREbeginningtheconnectionofthevariouscooling
and/orheatingmediumstotheunit.Thesupplyandreturn
connectionsaremarkedwitha“HS/CS”meaningHot/
ColdwaterSupplyorinletand“HR/CR”meaningHot/
ColdwaterReturnoroutletindicatinguidowdirection
intoandfromthecoil.
Leak Testing
Aftersecuringtheconnections,testthesystemforany
leaks.Alwaystesthydronicsystemswithwaterassome
componentsarenotdesignedtobeinertgaspressurized.
Fieldpressuretestingforleaksshouldnotexceed300psi
forhydroniccoilandvalvepackagecomponents.Consult
factoryifhigherlimitsarerequired.
CAUTION: Protect all water coils from freezing
after initial lling with water. Even if the system
is drained, unit coils may still hold enough water to
cause damage when exposed to temperatures below
freezing.
Refrigerant Coil Testing
Testrefrigerantsystemswithdrynitrogenratherthanair
topreventtheintroductionofmoistureintothesystem.
Intheeventthatleakingordefectivecomponentsare
discovered,notifytheSalesRepresentativeBEFOREany
repairsareattempted.Allleaksmustberepairedbefore
proceedingwiththeinstallation.InDXsystems,adequate
freezeprotectionshouldbeeld-installed.
Piping Insulation
Aftersystemintegrityhasbeenestablished,insulatethe
pipinginaccordancewiththeprojectspecications.Thisis
theresponsibilityoftheinstallingorinsulationcontractor.
Condensate Drain
Anyfancoilunitwithadrainpanisrecommendedto
beequippedwithadraintraptoprovidecondensate
drainageandpreventpropertydamage.
ThedrainU-trapshouldbedeepenoughtooffset
maximumunitstaticpressuredifferenceasshownat
Figure14,topreventcondensateowingbacktodrain
pan.
Figure 14. Condensate drain U-trap
reconnection, flooding of the
Condensate Float switch
Thecondensateoatswitchisusedtodetectcloggedor
restrictedcondensatepandrains.Thecondensateswitch
usesaNormallyClosedcontacttoallowthesystemcontrol
powertopassthroughtheswitchenergizingthewater
valvesandfansallowingnormaloperation.Whenan
overowconditionisdetectedbytheswitch,itopensthe
NCcontactsandde-energizesthewatervalvesandfans.
NOTE: All eld wiring must be in accordance with
governing codes and ordinances. Any
modication of unit wiring without factory
authorization will invalidate all factory
warranties and nullify any agency listings.
The manufacturer assumes no responsibility
for any damages and/or injuries resulting from
improper eld installation and/or wiring.

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
12
SECTIONTHREE—Installation,Cont’d.
Connecting Ductwork
Allductworkshallbeinstalledinaccordancewiththe
projectplansandspecications.SeeFigures23-26for
supplyandreturnductangeslocationanddimensions
NOTE: When installing units that attach to branch duct
piping, use industry approved duct standards
and conguration such as those published by
Air Conditioning Contractors of America or
American Society of Heating, Refrigeration and
Air Conditioning Engineers. The standards provide
necessary information on sizing, layout and
installing supply and return air duct systems.
Flexibleductconnectionsshouldbeusedonallair
handlingequipment.Allductworkandinsulationshall
beinstalledtoallowproperaccesstoallcomponents
forserviceandrepairsuchaslters,motor/blower
assemblies,etc.
Make Final Preparations
1 Powerunit(s)off(openunitelectricaldisconnect)
andinstalllockouttagsonallpowersuppliesto
theunit.
2. Installeld-suppliedthermostatsandperform
allothernalwiringneeded.Ensureallelectrical
connectionsaresecure.
3. Performnalvisualinspection.Allequipment,
ductwork,andpipingshouldbeinspectedto
verifyallsystemsarecompleteandproperly
installedandmounted,andthatnodebrisor
foreignarticlesareleftintheunit(s).Cleandirt,
dust,andotherconstructiondebrisfromunit
interior.Assessfanwheelandhousingandclean
ifnecessary.
4. Verifydrainlineisproperlyandsecurely
positionedandthatthelineisclear.Pourwater
intodraintoverifyoperation.
5. Rotatefanwheelbyhandtobesureitisfreeand
doesnotrubhousing.
6. Installthelterintothelterframe.Ifeld-
suppliedltersareused,verifyltersize(see
Table5).
Maximum External Static Pressures
Model
VBA
Minimum
CFM
VBA
Max ESP
HDY/VDY
Minimum
CFM
HDY/VDY
Max ESP
H**/V**06 300 0.17 500 0.04
H**/V**08 400 1.35 600 0.36
H**/V**10 700 1.75 700 0.52
H**/V**12 900 0.87 900 1.12
H**/V**16 1000 1.73 1000 0.44
H**/V**20 1800 1.19 1800 1.04
HDY/VDY22 N/A N/A 1800 1.03
H**/V**30 2200 1.36 2200 0.38
Electrical Connections
Theunitserialplateliststheunitelectricalcharacteristics
includingtherequiredsupplyvoltage,fanandheater
amperageandrequiredcircuitampacity.Theunitwiring
diagramdisplaysallunitandeldwiring.Everyproject
isdifferentandeachunitonaprojectmaybedifferent,
theinstallermustbefamiliarwiththewiringdiagramand
serialplateontheunitBEFOREbeginninganywiring.
Ensurealleldelectricalconnectionsareinaccordance
withunitwiringdiagramandallapplicablenational
andlocalcode.Thetypeandsizeofallwiringand
otherelectricalcomponentsincludingcircuitbreakers,
disconnectswitches,etc.shallbedeterminedbythe
individualjobrequirements.Verifyconductorsizeis
suitableforthedistancetotheequipmentconnectionand
willsupporttheequipmentelectricalload.Allinstallations
includingeldwiringshallbemadeincompliancewith
allgoverningcodesandordinances.Compliancewithall
codesistheresponsibilityoftheinstallingcontractor.
Allcomponentsfurnishedforeldinstallationbyeither
thefactoryorthecontrolscontractorshallbelocatedand
checkedforproperfunctionandcompatibility.Inspect
allinternalcomponentsforshippingdamage.Inspect
allelectricalconnectionswithintheunitcontrolboxand
accessoriesandtightenifnecessary.

Horizontal and Vertical Direct Drive Blower Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
13
SECTIONFOUR—Start-Up
SECTION4–Start-Up
Beforebeginninganystartupoperation,thestartup
personnelshallfamiliarizethemselveswiththeunit,
optionsandaccessories,andcontrolsequenceto
understandthepropersystemoperation.Allpersonnel
shallhaveagoodworkingknowledgeofgeneralstartup
proceduresandhavetheappropriatestartupand
balancingguidesavailableforconsultation.
Thebuildingmustbecompletelynishedincludingdoors,
windows,andinsulation.Allinternalwallsanddoors
shouldbeinstalled.Insomecases,theinteriordecorations
andfurnituremayinuenceoverallsystemperformance.
Theentirebuildingshouldbeascompleteaspossible
beforebeginninganysystembalancing.
TheBuildingbreakerwillbeusedasthedisconnectswitch.
Anadditionalserviceswitchmaybeinstalledontheunit.
CAUTION: A clean set of lters must be installed
after commissioning.
CAUTION: All panels must be in place when the
motor is running.
Maximumoperatingaltitudeforunitsis13,400ft.(4km).
AllunitsareIPX0rated.
Cooling/Heating System
Priortothewatersystemstartupandbalancing,ush
thechilled/hotwatersystemstocleanoutdirtanddebris
whichmayhavecollectedinthepipingduringconstruction.
Duringthisprocedure,allunitservicevalvesmustbein
theclosedpositiontopreventforeignmatterfromentering
theunitandcloggingthevalvesandmeteringdevices.
Strainersshallbeinstalledinthepipingmainstoprevent
suchmaterialfromenteringunitsduringnormaloperation.
Duringsystemlling,airventingfromtheunitis
accomplishedbytheuseofthestandard,manualairvent
tting,ortheoptional,automaticairventttinginstalled
onthecoil(Figure15).Manualairventsarebasicschrader
valvesthatcouldbeaccessedfromthecoilsideoftheunit
andarelocatedbetweenthecoilheaderandendsheet.
Toventtheairfromthecoil,depressthevalveuntiltheair
hasventedthecoil.Whenwaterbeginstoescapethrough
thevalve,releasethevalve.
Automaticairventsmaybeunscrewedoneturn
counterclockwisetospeedinitialventing,butshouldbe
screwedinforautomaticventingafterstartupoperations.
Figure 15. Air vents
Manual Air Vent
Automatic Air Vent
CAUTION: The air vent provided on the unit is
not intended to replace the main system air vents
and may not release air trapped in other parts of the
system. Independently inspect the entire system for
potential air traps and vent those areas as required. In
addition, some systems may require repeated venting over
a period of time to properly eliminate air from the system.
Direct Expansion (DX) Systems
Note: Operation of DX equipped fan coils at any fan
speed other than high fan speed is not approved and
will void the manufacturer’s limited warranty.
• DonotoperatefancoilswithaDXevaporator
coilpluscontiguoushydroniccoilwithoutuse
ofasuitableglycolsolutionthatisapprovedforuseby
themanufacturer.Failuretofollowthisinstructionwill
voidthemanufacturer’slimitedwarranty.
• Shouldtheevaporatorfreezeduetoinadequate
airowforanyreason,damagemayoccurtoadjacent
waterorsteamcoiltubing.Thistypeofissueisdueto
productmisapplicationandvoidsthemanufacturer’s
limitedwarranty.
7. Ensureallpanelsandltersareinstalledbefore
checkingfanoperation.Turnonpowertotheunit.
8. Inspectthefanandmotoroperation.

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
14
SECTIONFOUR—Start-Up,Cont’d.
Air Balance System
Allductworkmustbecompleteandconnected.Alllters
andaccessdoorsandpanelsmustbeproperlyinstalled
toestablishactualsystemoperatingconditionsBEFORE
beginningairbalancingoperations.
Eachindividualunitandtheattachedductworkisa
uniquesystemwithitsownoperatingcharacteristics.For
thisreason,airbalancingisnormallydonebybalance
specialistswhoarefamiliarwithallproceduresrequired
toproperlyestablishairdistributionandfan-system
operatingconditions.Theseproceduresshallnotbe
attemptedbyunqualiedpersonnel.
Afterpropersystemoperationisestablished,theactual
unitairdeliveryandtheactualfanmotoramperagedraw
foreachunitshouldberecordedinaconvenientplacefor
futurereference.
Control Board Adjustment.
AdjustingtheLow,MediumandHighpotentiometer
requirestheuseofMulti-metercapableofmeasuring
0~10VDC.
CAUTION: Only trained and qualied individuals
should attempt to adjust or service components
on any energized electrical equipment. Failure to follow
established safety rules and guidelines could result in
serious injury or death.
Figure 16. Motor Control Board
Potentiometer
Low, Med, High CFM adjust
Whenunitisshippedfromthefactorywithmotorcontrol
board(whichhasHi,MedandLowairowsettings),it
ispre-programmedatthefactoryto“High”speedand
deliverstheairowandcooling/heatingcapacityspecied
Figure 17. Control box layout
Above is the example of Control box for Size 20 unit with electric heat, disconnect switch and service light.
(HDY)

Horizontal and Vertical Direct Drive Blower Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
15
SECTIONFOUR—Start-Up,Cont’d.
atthetimeoforder,whileMediumandLowSpeedsare
settodefaultsbasedonHighspeed.Shouldairow
requireadjustmentafterinstallation,thecontrolboard
settingsforLow,MediumandHighcouldbeadjustedby
turningscrews(asshowninthepicture)usingasmall
PhillipsScrewdriver.Itwilladjustthecontrolvoltagetothe
motor.Aclockwiserotationincreasesthevoltagetothe
motor,whilecounterclockwiserotationreducesit.
CAUTION: On units with Electric Heat – the
factory default setting for Low airow prevents
nuisance tripping of the Electric Heat protection circuit.
Turning the Low Speed screw counter clockwise can
cause interruptions in the Heating performance of the
unit due to the activation of this protective circuit.
WhenunitisorderedwithProportionalControl,IEC
RatingsProgramwillidentifytheHighandLowspeed
controlvoltagerangeinwhichtoprogramtheThermostat/
Controller.
CAUTION: Turning the voltage up past the
setting for High Speed may introduce the risk
of condensate blow off.
Unitmustbepoweredtoperformthefollowingprocedure.
SettheelectricalmultimetertoVDC(VoltsDirectCurrent).
AttachtheREDpositive(+)leadofthemetertotheDC
OUTPUTS.LOW,MED&HIGHaretypicallyconnected
together.
1. CloseeithertheLOW,MED&HIGHspeed
relaycontactsbyapplying24VACtothe
correspondingLOW,MEDorHIGH24VAC
INPUTandCOM.
2. MeasurevoltageattheDCOUTPUTSandadjust
thepotentiometerforthatspeed.(VR1LOW,VR2
MED,VR3HIGH)
3. InordertoachievehigherCFM,turnthe
potentiometerClock-Wise.
NOTE: For specic voltages adjustment please contact
IEC factory representative.
Water Balancing System
Acompleteknowledgeofthehydronicsystem,alongwith
itscomponentsandcontrols,isessentialtoproperwater
systembalancing.Thisprocedureshallnotbeattempted
byunqualiedpersonnel.Thesystemmustbecomplete,
andallcomponentsmustbeinoperatingcondition
BEFOREbeginningwatersystembalancingoperations.
Eachhydronicsystemhasdifferentoperatingcharacteristics
dependingonthedevicesandcontrolsusedinthesystem.
Theactualbalancingtechniquemayvaryfromonesystem
toanother.
Afterthepropersystemoperationisestablished,record
theappropriatesystemoperatingconditionssuchas
variouswatertemperaturesandowratesinaconvenient
placeforfuturereference.
Before,andduringwatersystembalancing,conditions
mayexistduetoincorrectsystempressureswhichmay
resultinnoticeablewaternoiseorundesirablevalve
operation.Aftertheentiresystemisbalanced,these
conditionswillnotexistonproperlydesignedsystems.
Water Treatment
Properwatertreatmentisaspecializedindustry.
IECtherecommendsconsultingaWaterTreatment
Experttoanalyzewaterforcompliancewithwater
qualityparameterslistedbelow,andtorecommendan
appropriatewatertreatmentregimen.WaterTreatment
Expertsareabletorecommendtypicaladditivessuchas
rustinhibitors,scalingpreventative,antimicrobialgrowth
agents,oralgaepreventatives.Anti-freezesolutionsmay
alsobeusedtolowerthefreezingpoint.
IECwatercoiltubesandheadersareconstructedof
copper.Multiplebrassalloysmaybepresentinthevalve
package.Itistheuser’sresponsibilitytoensuretubeand
pipingmaterialsfurnishedbyIEC,arecompatiblewith
treatedwater.SeeTable4.
Failuretoprovideproperwaterqualitymayaffectthefan
coilunits’warranty.

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
16
SECTIONFIVE—Service/Maintenance
Table 4. Water quality parameters
Water Containing Required Concentration
Sulphate Lessthan200ppm
pH 7.0–8.5
Chlorides Lessthan200ppm
Nitrate Lessthan100ppm
Iron Lessthan4.5mg/l
Ammonia Lessthan2.0mg/l
Manganese Lessthan0.1mg/l
DissolvedSolids Lessthan1000mg/l
CaCO3Hardness 300-500ppm
CaCO3Alkalinity 300-500ppm
ParticulateQuantity Lessthan10ppm
ParticulateSize 800micronmax
NOTE: Maximumwateroperatingtemperature190°F(87°C).
 Maximumallowablewaterpressure500PSIG(3447Kpa)
Electronically Commutated Motor (ECM)
AllHDYunitsareequippedwithElectronicallyCommutated
Motors(ECM)-constantspeedbrushlessDC,whichare
easilyadjustableintheeldfordesiredperformance.
Motorsarepre-programmedforconstantspeedmode.
1/2HPand1HPmotorshaveintegratedcontrolmodule
withoverloadandshortcircuitprotection.
1-1/2HPand3HPmotorshaveremotemountedcontrol
modulewithoverloadandshortcircuitprotection.Control
moduleismountedinthecabinetinterior.
SECTION5–Service/Maintenance
General
Eachunithasanindividualoperatingenvironmentand
conditionsthatdictatethemaintenancescheduleforeach
unit.Aformalscheduleofregularmaintenanceandan
individualunitlogshouldbeestablishedandmaintained.
Thiswillachievemaximumperformanceandpreservethe
servicelifeofeachunit.
Observeandadheretoallsafetyprecautionscontained
intheprefaceofthismanualduringallserviceand
maintenanceoperations.
Formoredetailedinformationofserviceoperations
consultanIECSalesRepresentativeorthefactory.
Motor/Blower Assembly
Fanoperationtypeisdeterminedbythecontrol
componentsandtheirmethodofwiring.Thismayvary
fromunittounit.Refertothewiringdiagramattachedto
eachunitforindividualoperatingcharacteristics.
Allmotorshavepermanentlylubricatedballbearings.No
eldlubricationisrequired.
Shouldthemotor/blowerassemblyrequireservice,itmay
beremovedfromunittofacilitateoperationssuchas
motororblowerwheel/housingreplacement,etc.
Dirtanddustmustnotbeallowedtoaccumulateon
blowerwheelorhousing.Thiscanresultinanunbalanced
blowerwheelconditionwhichwilldamageablower
wheelormotor.Thewheelandhousingmustbecleaned
periodicallyusingavacuumcleanerandabrushtaking
carenottodislodgefactorybalancingweightsonthe
blowerwheelblades.
Bipolar Ionizer Brush Cleaning
Thebipolarionizerisdesignedtonotrequirereplacements
parts.
Thebrushesonthedevicemaybecomedirtyovertime
andwillrequirecleaningtomaintaintheeffectiveness
ofionoutput.Cleaningofbipolarionizerbrushesand
inspectionofdeviceshouldbeperformedattimeof
eachlterchangeorsooner,basedonthelocation,lter
effectivenessandgeneralenvironment.
1. Tocleanthebrushes,turnoffpowertotheunit.
NOTE: When power is OFF, the green LED
indicator on the device will not be illuminated.
2. Usingasmallnylonbrush,gentlywipeoffthetwo
brushes.SeeFigure18forbrushlocation.
3. Aftercleaning,restorepower.
Itisstronglyrecommendedthebipolarionizerbepaired
withaPleatedMERV8lterformosteffectiveindoorair
qualityresults.

Horizontal and Vertical Direct Drive Blower Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
17
SECTIONFIVE—Service/Maintenance,Cont’d.
Figure 18.
FRONT VIEW
IONIZATION
BRUSH
LED
INDICATOR
LIGHT
Coils
Coilsshouldbecleanedbyremovingthemotor/blower
assembliesandbrushingtheenteringairfacebetween
nswithastiffbrush.Brushingshouldbefollowed
bycleaningwithavacuumcleaner.Ifacompressed
airsourceisavailable,thecoilmayalsobecleanedby
blowingairthroughthecoilnsfromtheleavingair
face.Thisshouldagainbefollowedbyvacuuming.Units
equippedwithregularlyreplacedairlterswillrequire
lessfrequentcoilcleaning.
Electric Resistance Heater Assembly
Electricresistanceheaterstypicallyrequirenoscheduled
maintenancewhenunitairltersarechangedproperly.
Theoperationandservicelifemaybeaffectedbyother
conditionsandequipmentinthesystem.Thetwomost
importantoperatingconditionsforanelectricheaterare
properairowandpropersupplyvoltage.Highsupply
voltageand/orpoorlydistributedorinsufcientairow
overtheelementwillresultinelementoverheatingand
possiblelimitswitchopenings.
Thisconditionmayresultintheheatercyclingonthe
highlimitthermalcutout.Open-stripheatershavean
automaticresetswitchandhigh-limitthermalswitchasa
backup.Automaticresetlimitswitches,resetafterheater
hascooleddown.
High-limitthermalswitchesmustbereplacedoncethe
circuithasbeenbroken.Thehigh-limitthermalcutout
deviceisasafetydeviceonly,notintendedforcontinuous
operation.Thisdeviceonlyoperateswhenaproblem
exists,ANYconditionthatcauseshigh-limitcutoutMUST
becorrectedimmediately.Highsupplyvoltagealsocauses
excessiveamperagedraw,andmaytripthecircuitbreaker
orblowthefuse(s)onincomingpowersupply.
Afterproperairowandsupplypowerareassured,
regularltermaintenanceisimportanttoprovideclean
airovertheheater.Dirtallowedtodepositontheheating
elementwillcausehotspotsandeventualelementburn
through.Thesehotspotswillnormallynotbeenoughto
tripthehigh-limitthermalcut-outdevice,andmaynotbe
evidentuntilactualheaterelementfailure.
Cabinet/Control Box Maintenance Light – HDY
OptionalLEDServiceLightprovidesasourceof
illuminationinthemainunitcabinetandthecontrolbox
duringroutinemaintenanceandtroubleshootinginthe
darkceilingspaces.
Whenpoweristurned“OFF”formaintenanceor
troubleshooting,ControlBox/CabinetLightwillturn“ON”
assoonascontrolbox/cabinetdoorisopen(SeeFigure17).
Electrical Wiring and Controls
Refertowiringdiagramattachedtounitfortypeand
numberofcontrolsprovidedoneachunit.
Verifyintegrityofallelectricalconnectionsatleast
twiceduringtherstyearofoperation.Subsequently,
allcontrolsmustbeinspectedperiodicallyforproper
operation.Somecomponentsmayexperienceerratic
operationorfailureduetoage.Wallthermostatsmay
alsobecomecloggedwithdustandlint,andmustbe
periodicallyinspectedandcleanedtoprovidereliable
operation.
Whenreplacinganycomponentssuchasfusesorrelays,
useonlytheexacttype,sizeandvoltagecomponentas
furnishedfromthefactory.Anydeviationwithoutfactory
authorizationcouldresultinpersonnelinjuryordamage
totheunit.Thiswillalsovoidallfactorywarranties.Only
factory supplied replacement parts ensure that the
warranty and agency status remain in effect.Allrepair
workshallbedoneinsuchamannerastomaintain

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
18
SECTIONFIVE—Service/Maintenance,Cont’d.
theequipmentincompliancewithgoverningcodes,
ordinancesandtestingagencylistings.
Drain
Inspectdrainbeforeinitialstartup,andpriortoeach
coolingseasontoassurethatdraintrapandlineareclear.
Whenclogged,clearthedebrissocondensateeasily
ows.
Periodicallyinspectdrainduringcoolingseasonto
maintainafree-owingcondensate.Unitsareprovided
withasecondaryor“tell-tale”drainconnectionthatwill
indicateacloggedmain-drainlinebyowfrom“tell-tale”
connection.
Shouldalgaeand/orbacteriagrowthbecomeaconcern,
consultanairconditioningandrefrigerationsupply
organizationfamiliarwithlocalconditionsforchemicals,or
othersolutionsavailabletocontroltheseagents.
Filters, Throwaway
Throwawaytypelters;commonlyusedonfancoilunits
mustbereplacedonaregularbasis.Thetimebetween
replacementshouldbeestablishedbasedonregular
inspectionoflter,andalsorecordedinthelogforeach
unit.RefertoTable5forappropriatelterdimensions
compatiblewitheachunitsize.Ifreplacementltersare
notpurchasedfromfactory,ltersusedshouldbethe
sametypeandsizeasfactory,orrecommendedbyfactory.
Extendedsurfaceltersmustnotbeusedduetohighair
pressuredropsencounteredwiththesetypesoflters
beingincompatiblewiththetypeoffancoilunitcovered
inthismanual.Consultfactoryforapplicationsusinglter
typesotherthanfactorystandardoroptionalproduct.
Table 5. Filter sizes
Unit Size Filter
Quantity
Nominal Filter Sizes –
Inches (Millimeters)
HDY and VDY
06 116-1/2"x24"(419x610)
08 116-1/2"x24"(419x610)
10 118-1/4"x33"(464x838)
12 1 18-1/4"x33"(464x838)
16 218-1/4"x21-1/2"(464x546)
20/22 220-1/2x22"(521x559)
30 229"x22"(737x559)
Filters, Replacement, Installation
Eachunitisequippedwithreturnairlters.Filtersmustbe
periodicallyreplaced.
Units’ltersare1”(25.40mm),2”(50.80mm)or4”
(101.60mm)thick.Filterscanbeeasilyaccessedfromthe
sideorbottomofthelterrack(SeeFigures19and20).
Toremoveltersfromthesideofthelterrack:
1. Removethesideaccesspanel(A)ofthelterrack
bypullingtabatthebottom(HDYortop(VDY)of
thepaneltofreefrommagnets,andloweritoutof
theslot(B)inthetopofthelterframe
2. Pulloutdirtylters.
3. Replacewithnewappropriatesizelters.
4. Tore-installsideaccesspanelintolterrack:
a) Insertthetabofpanelintotheslotinlter
frame’stop(B).
b) Rotatepaneltowardtheframe,ensure
magnetsareengaged.
Toremoveltersfromthebottom(HDY)ortop(VDY)of
thelterrack:
1. Openhingedbottomaccesspanel(C)-pulldown
todisengagemagnets.
2. Pulloutdirtylters.
3. Replacewithnewappropriatesizelters.
4. Securebottomaccesspanels,makesuremagnets
arere-engaged.
Unitsaredesignedtoacceptvariousltersizesdepending
onjobrequirements.Eachlterframeisequippedwith
FilterSupportAngleBrackets(D)and1”or2”lterslots
onallfoursidesoflterframe.TheFilterSupportAngle
Brackets(D)aredesignedtoprovideguidanceand
supporttothenewlterasitisbeinginserted.
Inordertoaccommodate1”and2”lters,thebracket
shouldbeinsertedintocorrespondingslotsonallsidesof
thelterframe(SeeFigures19and20)andsecuredwith
screws.When4”lterisinstalled,thebracketsshould
bestoredforfutureusewithdifferentlterthickness,or
discardedif4”lterwillbealwaysused.

Horizontal and Vertical Direct Drive Blower Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
19
SECTIONFIVE—Service/Maintenance,Cont’d.
Figure 19. HDY Filter rack
1” Filter
2” Filter
4” Filter
Magnet
B
A
C
See Detail X
Detail X
See Detail Y
Detail Y
Filter Support
Angle Bracket
Filter Support
Angle Bracket
1” Filter Slot
2” Filter Slot
D

HorizontalandVerticalDirectDriveBlowerCoils
INSTALLATION,OPERATION,&MAINTENANCEMANUAL
20
Figure 20. VDY Filter rack
SEE DETAIL Y
SEE DETAIL X
DETAIL X
DETAIL Y
MAGNETS
C
2" FILTER
1" FILTER
4" FILTER
B
A
D
2" FILTER BRACKET
MOUNTING HOLES
1" FILTER BRACKET
MOUNTING HOLES
FILTER SUPPORT
ANGLE BRACKET
FILTER SUPPORT
ANGLE BRACKET
SECTIONFIVE—Service/Maintenance,Cont’d.