IEC G Y Series Instruction manual

•
Indoor Environment
and Air Quality
•
Design Flexibility
•
Performance
•
 EnergyEfciency
•
Serviceability
Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
Vertical & Horizontal
- Verticaloororwallmountedforconcealedorexposedapplications
- Horizontalceilingforexposedorpartiallyexposedapplications
- Hotwatercoils,steamcoils,orelectricheatonlyoptions
- Optionalcolors,valvepackages,controls,andunitcongurations
- NominalCFMrangeof200to1,200CFM
DBY
GXY

Cabinet Heater G*Y/D*Y Series
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.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
3
SECTION THREE — Controls Operation
18 Board Components and Specications
20 Board Function and Diagnostics
25 LED Functions and Outcomes
(sequence of operations)
26 Wiring Diagrams
SECTION FOUR — Normal Operation
and Maintenance
28 General
28 Motor/Blower Assembly
28 Bipolar Ionizer Brush Cleaning
29 Coil
29 Electric Heater Assembly
29 Electrical Wiring and Controls
30 Valves and Piping
30 Filters, Throwaway
30 Filters, Permanent
31 Replacement Parts
SECTION FIVE — Equipment Start-Up
32 Check List - IMPORTANT
33 Terms and Conditions
SECTION ONE — Installation
4 Preface
4 Unpacking and Inspection
5 Prepare Jobsite and Units
5Handling and Installation
6Unit Clearance and Service Access
8Vertical Series Unit Installation
9Cabinet Front Panel Installation
and Removal
9Decorative Wall Panels
Installation (GHY)
11 Optional Trim Kit Installation
11 Horizontal Series Unit Installation
12 Hydronic Heating Connections
13 Electrical Connections
15 Ductwork Connections
16 Final Preparations
SECTION TWO — Start-Up
17 General Start Up
17 Hydronic Heating System
17 Air System Balancing
18 Water Treatment
18 Water System Balancing
Table of Contents

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
4
SECTION ONE — Installation
Preface
InternationalEnvironmentalCorporationcabinetheater
unitsrepresentaprudentinvestmentofferingtrouble-
freeoperationandlongservicewithproperinstallation,
operation,andregularmaintenance.Your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,regularperiodic
maintenance,andeverydayoperationoftheequipment
befollowedindetail.Thismanualshouldbefullyreviewed
inadvancebeforeinitialinstallation,start-up,andany
maintenance.Shouldanyquestionsarise,pleasecontact
yourlocalSalesRepresentativeorthefactoryBEFORE
proceeding.
Theequipmentcoveredbythismanualisavailable
withavarietyofoptionsandaccessories.Consultthe
approvedunitsubmittals,orderacknowledgment,and
othermanualsforspecicdetailsonunitoptionsand
accessories.
Noattemptshouldbemadetohandle,install,orservice
anyunitwithoutfollowingsafepracticesregarding
mechanicalequipment.
Theequipmentmustalwaysbeproperlysupported.
Temporarysupportsusedduringinstallationorservice
mustbeadequatetoholdtheequipmentsecurely.
Allpowermustbedisconnectedbeforeanyinstallation
orserviceisattempted.Morethanonepowersourcemay
besuppliedtoaunit.Powertoremotemountedcontrol
devicesmaynotbesuppliedthroughtheunit.
Neverwearbulkyorloose-ttingclothingwhenworking
onanymechanicalequipment.Glovesshouldalways
bewornforprotectionagainstheatandotherpossible
injuries.Safetyglassesorgogglesshouldalwaysbe
worn,especiallywhendrilling,cutting,orworkingwith
chemicalssuchasrefrigerantsorlubricants.
Neverpressurizeanyequipmentbeyondspeciedtest
pressuresasshownon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.
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.
Allmechanicalandelectricalconnectionsshouldbemade
byauthorizedpersonnelinaccordancewithNationaland
localcodeswhereapplicable.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.
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controlvalvesandelectroniccontrol
itemsmaybeapossibleexception.
Eachunitiscarefullypackagedforshipmenttoavoid
damageduringnormaltransitandhandling.Equipment
shouldalwaysbestoredinadryandcoveredlocationand
intheproperorientationasmarkedonthecarton.
AllshipmentsaremadeF.O.B.factoryanditisthe
responsibilityofthereceivingpartytoinspectthe
equipmentuponarrival.Anyobviousdamagetothe
cartonand/oritscontentsshouldberecordedonthebillof
ladingandaclaimshouldbeledwiththefreightcarrier.
Afterdeterminingtheconditionofthecartonexterior,
carefullyremoveeachunitfromthecartonandinspect
forhiddendamage.Atthistime,checktomakesure
thatfactoryprovideditemssuchasvalvepackages
andactuators,switches,thermostats,driplips,etc.,are
accountedfor.Anyhiddendamage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,

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
5
SECTION ONE — Installation, Cont’d.
shippingcarton,andallpackingmustberetainedfor
physicalinspectionbythefreightcarrier.Allequipment
shouldbestoredinthefactoryshippingcartonwith
internalpackinginplaceuntilinstallation.
Atthetimeofreceipt,theequipmenttypeand
arrangementshouldbeveriedagainsttheorder
documents.Shouldanydiscrepancybefound,thelocal
IECFactoryRepresentativeshouldbenotiedimmediately
sothatproperactionmaybetaken.
NOTE: Should any questions arise concerning warranty
repairs, the factory must be notied BEFORE any
corrective action is taken.
Prepare Jobsite and Units
Tosavetimeandtoreducethepossibilityofcostlyerrors,
setupacompletesampleinstallationinatypicalroomat
thejobsite.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Figure1forsample
drawing).Instructalltradesintheirpartoftheinstallation.
Shouldanydiscrepanciesbediscovered,contactyourlocal
representativebeforecontinuingwithunitinstallations.
Foreachunit,conrmincomingandcontrolpower
requirementsmatchavailablepowersource.Refertounit
nameplateandwiringdiagram.
1. Checkalltagsonunittodetermineifshipping
screwsaretoberemoved.Removescrewsas
directed.
2. Rotatethefanwheelbyhandtoensurethatthe
fanisunrestrictedandcanrotatefreely.Check
forshippingdamageandfanobstructions.Adjust
blowerwheelasrequired.
3. Perform“DryFit”ofvalveassemblythatmaybe
shippedunattachedtounitcoilassembly.Should
anyquestionsariseontuppleasecontactyour
localrepresentativeimmediately.
Handling and Installation
Whileallequipmentisdesignedandfabricatedwith
sturdymaterials,andmaypresentaruggedappearance,
greatcaremustbetakentoassurethatnoforceor
pressurebeappliedtothecoil,pipingordrainstub-
outsduringhandling.Also,dependingontheoptions
andaccessories,someunitscouldcontaindelicate
componentsthatmaybedamagedbyimproperhandling.
Whereverpossible,allunitsshouldbemaintainedinan
uprightposition,andhandledbythechassis,plenum
sections,orascloseaspossibletothemounting-point
locations.Inthecaseofafullcabinetunit,theunitmust
obviouslybehandledbytheexteriorcasing.Thisis
acceptableprovidingtheunitisagainmaintainedinan
uprightposition,andnoforceisappliedthatmaydamage
internalcomponentsorpaintedsurfaces.
TheequipmentcoveredinthismanualIS NOTsuitable
foroutdoorinstallations.Theequipmentshouldnever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,specialcaremustbe
takentopreventforeignmaterialsuchaspaint,plaster,
anddrywalldustfrombeingdepositedinthedrainpan
oronthemotororblowerwheels.Failuretodosomay
haveseriousadverseeffectsonunitoperation,andin
thecaseofthemotorandblowerassembly,mayresult
inimmediateorprematurefailure.Allmanufacturer’s
warrantiesarevoidifforeignmaterialisallowedtobe
depositedinthedrainpanoronthemotororblower
wheelsofanyunit.Someunitsand/orjobconditions
mayrequiresomeformoftemporarycoveringduring
construction.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
6
SECTION ONE — Installation, Cont’d.
Unit Clearance and Service Access
Forspecicunitdimensions,refertoTechnicalCatalogCA-010submittaldrawingsforyourmodel.Provideadequate
clearancefortheremovalofthepanel,accesstocontrolsorreplacementofinternalserviceablecomponentsincluding
airlters.Allowclearancesaccordingtolocalandnationalcodes.
Serviceaccessisavailablefromthefrontonverticalunits.Cabinetandrecessedunitshaveremovablefrontpanelsto
allowaccesstotheunit.
HydronicHeatunitshaveeitherrightorlefthandpiping.Referencepipinglocationsbyfacingthefrontoftheunit
(airowdischargesfromthefront).Thecontrolpanelisalwaysontheendoppositethepiping.
SeeFigures1and2forrecommendedserviceandoperatingclearances.
Size GHY GXY/GSY
02 23-1/2(597) 41(1041)
03 27-1/2(699) 45(1143)
04 33-1/2(851) 51(1295)
06 43-1/2(1105) 61(1549)
08 45-1/2(1156) 63(1600)
10 59-1/2(1511) 77(1956)
12 67-1/2(1715) 85(2159)
Table 1. Vertical Floor (GHY and GXY/GSY)Figure 1. Vertical Concealed (GHY)
8in.fromange
bothsides
36in.
SeeTable1 24in.
36in.
Figure 2. Vertical Cabinet (GXY, GSY)
SeeTable1

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
7
SECTION ONE — Installation, Cont’d.
Size DBY DXY
02 37(940) 38(965)
03 37(940) 42(1067)
04 43(1092) 48(1219)
06 55(1397) 53(1346)
08 55(1397) 60(1524)
10 77(1956) 74(1880)
12 77(1956) 83(2083)
Table 2. Horizontal Ceiling Coil Removal
Minimum Service Clearance Width
12-18in.
see table 2 28in.
28in.
Figure 4. DXY Unit Clearance
Service Access
Controls
Side
Piping
Side
12-18in.
28in.
28in.
see table 2
Controls
Side
Piping
Side
Figure 3. DBY Unit Clearance
and Service Access

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
8
SECTION ONE — Installation, Cont'd.
Vertical Series Unit Installation
GHY, GXY, GSY
Verticalunitmodelsaredesignedtobeoormountedor
otherwisesupportedfrombelowandboltedtothewall
oroorstructurethroughthemountingholesprovided
inthechassis.Theseunitsmaybewallmountedonly
whenoriginallyorderedfromthefactoryforwall-mount
applications.
Thetypeofmountingdeviceisamatterofchoice;
however,themountingpointshallalwaysbethatprovided
inthechassisorcabinet.Fastenersandotherrequired
hardwaremustbeeld-supplied.Refertotheunitproduct
drawingsforholemountinglocationsandsizes.
Floor Mount
1. Selecttheunitlocation.Allowforadequatespace
forfreeaircirculation,serviceclearances,piping
andelectricalconnections,andanynecessary
ductwork.
2. Makesuretheoorisabletosupporttheweight
oftheunit.Seesubmittaldrawingsfornominal
unitweight.
3. Ensurewallbehindunitissmoothandplumb;
ifnecessary,installfurringstripsonwallswith
irregularsurfacesormullions.Furringstrips
mustbepositionedbehindmountingholesin
unit.Fasteners,furringstrips,andotherseals(if
required)mustbeeld-supplied.
4. Removeallwallandoormoldingsfrombehind
theunit.
5. Adjustoptionalunitlevelinglegssounitislevel.
Unitmustbelevelforproperoperation.
Wall Mount
Figure 5. Wall Mount Hanger Hole Locations – GHY
Figure 6. Wall Mount Hanger Hole Locations – GXY, GSY
Table 3. C dimension for Wall Mount Hanger Hole Locations
Unit Model C
02 23(584)
03 27(686)
04 33(838)
06 43(1092)
08 45(1143)
10 59(1499)
12 67(1702)
1. Preparewallopeningsforrecessedunits.
Referencesubmittaldrawingsforunitsize
dimensions.
2 Markthepositionofthehangerholesonthewall
accordingtothedimensionsprovidedinFigures5
or6.Aligntheholelocationsevenly.
3. Preparetheeld-providedinstallationhardware
beforesettingtheunitinplace.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
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SECTION ONE — Installation, Cont'd.
4. ForCabinetUnits(GXY,GSY),removethefront
panelbeforeinstallation.
5. Mounttheunitonthehangerhardware.Testto
verifytheunitisproperlysupported.
6. Completepipingandwiringconnections,in
additiontoanynecessaryductworktotheunitas
instructedinthefollowingsections.Ensurethat
theauxiliarydrainpanisinpositionforcoildrain,
whenapplicable.
7. Reinstallthefrontpanel(GXY,GSYcabinetunits)
beforestart-up.
Cabinet Front Panel Installation and Removal
ForGXY,GSYunits,replacethefrontpanelbyaligning
thebottomtabsontheunitwiththerespectiveslotson
thepanelbottom.Alignthetopedgeoftheunitwiththe
panel.
Decorative Wall Panels Installation (GHY)
For Fully Recessed Units
GHYmodelsarefullyrecessedandbuiltintothewallof
theconditionedareas.Theycovertherecessopeningon
allsidesandareeasilyremovedforaccesstotheunit.
Atop,bottom,andsideframingstudsarerequiredto
properlysecurethewallpaneltodrywall.Reference
Figures8and10forinstalldiagramrequirements.Secure
theWallpanelFRAMEtotheframingstudswitheld
suppliedmountinghardware.
Oncetheframeissecuredtothewall,installthepaneland
securetotheframewiththefactoryprovidedquarter-turn
camlocks.
Table 4. Style W & Z Framed Wall Panel Dimensions
Nominal
CFM
Panel
Width (A)
Inches
(mm)
Frame Width
(B)
Inches (mm)
Wall Opening
Inches (mm)
Width Height
200 40”(1016) 41-3/4”(1061) 40-3/8”(1026) 30-1/4”(768)
300 40”(1016) 41-3/4”(1061) 40-3/8”(1026) 30-1/4”(768)
400 50”(1270) 51-3/4”(1315) 50-3/8”(1280) 30-1/4”(768)
500 50”(1270) 51-3/4”(1315) 50-3/8”(1280) 30-1/4”(768)
600 60”(1524) 61-3/4”(1569) 60-3/8”(1534) 30-1/4”(768)
800 62”(1575) 63-3/4”(1619) 62-3/8”(1585) 30-1/4”(768)
1000 76”(1930) 77-3/4”(1975) 76-3/8”(1940) 30-1/4”(768)
1200 84”(2134) 85-3/4”(2178) 84-3/8”(2143) 30-1/4”(768)
Figure 7. Style W Framed Wall Panel
Style W

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
10
SECTION ONE — Installation, Cont'd.
Figure 8. Style W Framed Wall Panel Install Diagram
Figure 9. Style Z Framed Wall Panel
Style Z
Figure 10. Style Z Framed Wall Panel Install Diagram

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
11
SECTION ONE — Installation, Cont'd.
Optional Trim Kit Installation
Anoptionaltrimkitcanbeappliedtopartiallyrecessthe
GXY,GSYunitsinthewall.Thetrimkitcanalsobeapplied
tocoverroughopeningtoeliminatetheneedfornish
worksuchascarpentry,drywall,painting,etc.
Referenceunitsubmittaldrawingsforunitsizes.Trimkits
have1"anges.
Thereare3mountingbrackets(twosides,onetop)
providedinthetrimkitforoormountunits.Thereare
4mountingbrackets(twosides,top,bottom)inthetrim
kitforwallmountunits.Therearenomountingholes
providedontheunitsothebracketscanbepositionedat
whateverdepthsisrequiredforrecess.Useselftapping
screwstosecurethebracketstotheunit.
Figure 11. Trim Kit Around Floor Mount Unit
Horizontal Series Unit Installation
DBY, DXY
Anchoringtheequipmentinplaceisaccomplishedby
usingthemountingpointsprovidedwith3/8”all-thread
rodandotherhardware(notsuppliedwithunit).The
unitmustbepositionedsothatthecoilorelectricheat
elementsareonaLEVELPLANE.
Othereld-furnishedmountingdevicessuchasrubber-
in-shearorspring-typevibrationisolatorsselectedbythe
contractororengineermaybesubstitutedforthefactory
grommetsandshouldbeusedwherefactorygrommets
arenotprovided.Refertothedevicemanufacturerfor
installationinstructions.
Itshouldbenotedthatunacceptablesystemoperating
characteristicsand/orperformancemayresultfrom
improperorinadequateunitstructuralsupport.Adequate
clearancemustbeprovidedforserviceandremovalofthe
equipmentandanyaccessorycomponents.
Table 5. Threaded Rod Recommendations
Model Rod Diameter Rod Qty
D*Y02,03,04,06,08,10,12 3/8” 4
*NOTE–Threadedrodsandhardwareareprovidedbyothers.
Figure 12. Channel Mount Suspension*
*NOTE–Figure12depictsDBY.Hangerrailsandhardwareareprovidedbyothers.
CabinetunitmodelsDBYandDXYmaybemountedusing
fourneoprenegrommetsprovidedinthefourhangerholes
inthecasetop.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
12
SECTION ONE — Installation, Cont'd.
 Ifcoilandvalvepackageconnectionsaretobemade
witha“sweat”orsolderjoint,careshouldbetakento
assurethatnocomponentsinthevalvepackageare
subjectedtoahightemperaturewhichmaydamage
sealsorothermaterials.Manytwo-positionelectric
controlvalves,dependingonvalveoperation,are
providedwithamanualopeninglever.Thislever
shouldbeplacedinthe“open”positionduringall
solderingorbrazingoperations.
 Ground-Jointsealpreparationforcopperunions
(recommendedbymanufacturer):
1. Makesurethegroundjointareaisfreeof
nicksandscratches.
2. Spraytheground-jointareawithsilicone
sprayforbeeswaxtoenhanceseating.
3. Recommendedtorquesforgroundjointseal:
 ½”(nominal)unions–35ft./lbs.(minimum)
 ¾”(nominal)unions–60ft./lbs.(minimum)
4. Makesurealignmentoflinedoesnotput
lateralstressontheground-jointseal.
5. Makesurethatexcesssolderdropletsdonot
reachtheground-jointarea.
Ifthevalvepackageconnectionatthecoilismadewith
aunion,thecoilsideoftheunionmustbeprevented
fromtwisting(“backedup”)duringtighteningto
preventdamagetothecoiltubing.Over-tightening
mustbeavoidedtopreventdistorting(“eggshaping”)
theunionsealsurfaceanddestroyingtheunion.
 Thesupplyandreturnconnectionsaremarkedon
thecoilstub-outsandthevalvepackage,withan“S”
meaningsupplyorinletand“R”meaningreturnor
outletindicatingowdirectiontoandfromthecoil.
Redlettersmarkthehotwaterconnections.
1. ForDXYandDBYunits,factoryprovidestube
extensionstopenetratetherearofthefancoil
cabinet.Hotextensiontubesmustbeproperly
insulated.
Hydronic Heating Connections
Aftermountingtheunit,itisthenreadyforthevarious
serviceconnectionssuchaswaterandelectrical.Atthis
time,itshouldbeveriedthatthepropertypesofservices
areactuallyprovidedtotheunit.Onthoseunitsrequiring
hotwater,theproperlinesizeandwatertemperature
shouldbeavailabletotheunit.
CAUTION: Toxic residues 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. Special consideration must be given to
system cleanliness when connecting to solar, domestic
or potable water systems.
Submittalsandproductliteraturedetailingunitoperation,
controls,andconnectionsshouldbethoroughlyreviewed
BEFOREbeginningtheconnectionofthevariouscooling
and/orheatingmediumstotheunit.
1. Auxiliary Drain Pan
 Anoptionalauxiliarydrainpanisavailableforcoil
draining.
 Theauxiliarydrainpanisshippedloosefromthe
factoryandmustbeinstalleddirectlybelowthecoil
drain.
 Theauxiliarydrainpanissituatedtotheinner-case
legbywayofeithersupportingtabsextendingfrom
thecaselegorbywayofslotsinthecaseleg.The
drainpipeoradraintrapisthenconnectedtothe
stub-outoffthebottomofthepan.Conrmthatthe
panissecureandpositionedforproperoperation.
2. Valve Package Install (when applicable)
NOTE: Always protect hot water valve bodies,
strainers, ball valves, and other ow control related
devices from heat caused by soldering or brazing
processes by wrapping these devices in cold or
damp rags.
 Allaccessoryvalvepackagesshouldbeinstalledas
required,andallservicevalvesshouldbecheckedfor
properoperation.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
13
SECTION ONE — Installation, Cont'd.
 Labeleachtubeextensionforpurpose,i.e:
"HS"forHeatingSupply,etc.Soldertube
extensionstothevalvepackage.
2. Removevalveactuatorstemporarilyduring
valveinstallation.Protectunitwiringfrom
damage.
3. Install valve package.
4. Torqueunionstightusingbackupwrenchto
preventdamagetocoiltubes.Alignexiting
tubestothecenterofthepipeopenings.
5. Ifdesired,applysplitbushingsorgrommets
(providedbyothers)tothepipesfor
mechanicalsupportandprotection.Donot
allowcoppertubetocontactsteelcabinet.
6. Nowisagoodtimetoleaktesttheunions
andttings,usingairpressureandsoap.The
coilairvent(s)maybeusedforthispurpose.
Figure 13. General valve package assembly. DXY unit shown.
 Aftertheconnectionsarecompleted,thesystem
shouldthenbetestedforleaks.Sincesome
componentsarenotdesignedtoholdpressurewith
agas,hydronicsystemsshouldbetestedwithwater.
Pressuretestingshouldbecompletedpriortosheet
rockingorpainting.
CAUTION: All water coils must be protected
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.
Intheeventthatleakingordefectivecomponentsare
discovered,theSalesRepresentativemustbenotied
BEFOREanyrepairsareattempted.Allleaksshouldbe
repairedbeforeproceedingwiththeinstallation.
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.
Electrical Connections
Theelectricalservicetotheunitshouldbecomparedto
theunitnameplatetoverifycompatibility.Therouting
andsizingofallpiping,andthetypeandsizingofall
wiringandotherelectricalcomponentssuchascircuit
breakers,disconnectswitches,etc.shouldbedetermined
bytheindividualjobrequirements.Verifytheelectrical
conductorsizeissuitableforthedistancetotheequipment
connectionandwillsupporttheequipmentelectricalload.
Allinstallationsshouldbemadeincompliancewithall
governingcodesandordinances.Compliancewithallcodes
istheresponsibilityoftheinstallingcontractor.
Theunitserialplateliststheunitelectricalcharacteristics
suchastherequiredsupplyvoltage,fanandheater
amperageandrequiredcircuitampacities.Theunitwiring
diagramshowsallunitandeldwiring.Sinceeach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.
Allcomponentsfurnishedforeldinstallationbyeitherthe
factoryorthecontrolscontractorshouldbelocatedand
checkedforproperfunctionandcompatibility.Allinternal
componentsshouldbecheckedforshippingdamage,and
anylooseconnectionsshouldbetightenedtominimize
problemsduringstart-up.
Anydevicessuchasfanswitchesorthermostatsthat
havebeenfurnishedfromthefactoryforeldinstallation
mustbewiredinstrictaccordancewiththewiring
diagramthatappearsontheunit.Failuretodosocould
resultinpersonalinjuryordamagetocomponentsandwill
voidallmanufacturer’swarranties.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
14
SECTION ONE — Installation, Cont'd.
Thefanmotor(s)shouldneverbecontrolledbyanywiring
ordeviceotherthanthe3-speedswitchorthermostat/
switchcombinationwithoutfactoryauthorization.
Fanmotor(s)maybetemporarilywiredforuseduring
constructiononlywithpriorfactoryapprovalinstrict
accordancewiththeinstructionsissuedatthattime.
Alleldwiringshouldbedoneinaccordancewith
governingcodesandordinances.Anymodicationofthe
unitwiringwithoutfactoryauthorizationwillvoidallofthe
factorywarranties,andwillnullifyanyagencylistings.
Themanufacturerassumesnoresponsibilityforany
damagesand/orinjuriesresultingfromimpropereld
installationand/orwiring.
1. Afterplanningforandbringingincomingpower
totheunit,locatethecontrolboxandcoverplate
(incomingelectricalpowerwiringcompartment).
Figure 14. Control box with cover plate
Incoming Electrical Power
Wiring Compartment
2. Determineappropriateknockouttofeedincoming
powerwiringintobox.
3. Loosenscrewstorotatecoverplatetoaccess
wiring.
Figure 15. Loosened covered plate

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
15
SECTION ONE — Installation, Cont'd.
4. Secureincomingpowerwiringwithproper
serviceentranceconnectorand/orappropriate
strainrelief.Usewirenutsconnectionsthatmeet
wiregaugerequirements.
5. Replacecoverplateandsecurescrews.
Figure 16. External unit-mount control box access
Figure 17. Unit-mounted control box access
*NOTE–ImagedepictscontrolboxmountedinDBYunit
Figure 18. Thermostat unit-mount
*NOTE–ImagebelowdepictscontrolboxwithVentureWi-FiThermostat
Ductwork Connections
Allductworkand/orsupplyandreturngrillesshould
beinstalledinaccordancewiththeprojectplansand
specications.Ifnotincludedontheunitorfurnishedfrom
thefactory,supplyandreturngrillesshouldbeprovidedas
recommendedintheproductcatalog.
Forunitswithnoreturn-airductwork,checklocalcode
requirementsforpossibleapplicationrestrictions.Allunits
mustbeinstalledinareasthatarenon-combustible.
Somemodelsaredesignedtobeconnectedtoductwork
withaMINIMUMamountofexternalstaticpressure.
Theseunitsmaybedamagedbyoperationwithout
theproperductworkconnected.Consulttheapproved
submittalsandtheproductcatalogforunitexternalstatic
pressurelimitations.
Unitsprovidedwithoutsideairforventilationshouldhave
someformoflow-temperatureprotectiontopreventcoil
freeze-up.
Flexibleductconnectionsshouldbeusedonallair
handlingequipmenttominimizevibrationtransmissions.
Allductworkandinsulationshouldbeinstalledtoallow
properaccesstoallcomponentsforserviceandrepair
suchaslters,motor/blowerassemblies,etc.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
16
SECTION ONE — Installation, Cont'd.
Themanufacturerassumesnoresponsibilityfor
undesirablesystemoperationduetoimproperdesign,
equipmentorcomponentselection,and/orinstallationof
baseunit,ductwork,grilles,andotherrelatedcomponents.
Final Preparations
1. Turnoffpowertotheunit(openunitelectrical
disconnect)andinstalllockouttagsonallpower
suppliestounit.
2. Installthermostatsandperformanyothernalwiring
asapplicable.Ensureallelectricalconnectionsare
tight.
3. Performanalvisualinspection.Allequipment,
plenums,ductwork,andpipingshouldbeinspected
toverifythatallsystemsarecompleteandproperly
installedandmounted,andthatnodebrisorforeign
articlessuchaspaperordrinkcansareleftintheunits
orotherareas.Cleandirt,dust,andotherconstruction
debrisfromunitinterior.Besuretocheckfanwheel
andhousingandclean,ifnecessary.
4. Rotatefanwheelbyhandtobesureitisfreeand
doesnotrubhousing.Checkthatwingnutssecuring
fanassemblytofandeckaretight.Adjustifnecessary.
5. Installlter.Ifeld-suppliedltersareused,besure
sizeisasspeciedinTable3.
6. Ensureallpanelsandltersareinstalledbefore
checkingfanoperation.Turnonpowertotheunit.
7. Checkthefanandmotoroperation.
8. Whenauxiliarydrainpanisincluded,verifydrainine
isproperlyandsecurelypositionedandthatthelineis
clear.Pourwaterintodraintocheckoperation.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
17
SECTION TWO — Start-Up
General Start Up
Beforebeginninganystart-upoperation,thestart-up
personnelshouldfamiliarizethemselveswiththeunit,
optionsandaccessories,andcontrolsequenceto
understandthepropersystemoperation.Allpersonnel
shouldhaveagoodworkingknowledgeofgeneral
start-upproceduresandhavetheappropriatestart-up
andbalancingguidesavailableforconsultation.
Thebuildingmustbecompletelynishedincludingdoors,
windows,andinsulation.Allinternalwallsanddoors
shouldbeinplaceandinthenormalposition.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initialstepinanystart-upoperationshouldbeanal
visualinspection.Allequipment,plenums,duct-work,and
pipingshouldbeinspectedtoverifythatallsystemsare
completeandproperlyinstalledandmounted,andthatno
debrisorforeignarticlessuchaspaperordrinkcansare
leftintheunitsorotherareas.
Eachunitshouldbecheckedfor:
1. freeblowerwheeloperation
2. loosewires
3. looseormissingaccesspanelsordoors
4. cleanlterofthepropersizeandtype
Exceptasrequiredduringstart-upandbalancingoperations,
nofancoilunitsshouldbeoperatedwithoutalltheproper
ductworkattached,supplyandreturngrillesinplace,andall
accessdoorsandpanelsinplaceandsecure.Failuretodo
socouldresultindamagetotheequipmentorbuildingand
furnishings,and/orvoidallmanufacturer’swarranties.
Hydronic Heating System
Priortothewatersystemstart-upandbalancing,thehot
watersystemsshouldbeushedtocleanoutdirtand
debriswhichmayhavecollectedinthepipingduring
construction.Duringthisprocedure,allunitservicevalves
mustbeintheclosedposition.Thispreventsforeign
matterfromenteringtheunitandcloggingthevalves
andmeteringdevices.Strainersshouldbeinstalledinthe
pipingmainstopreventthismaterialfromenteringthe
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.
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start-upoperations.
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. Inspect the entire system for potential air traps
and vent those areas as required, independently. In
addition, some systems may require repeated venting over
a period of time to properly eliminate air from the system.
Air System Balancing
Allductworkmustbecompleteandconnected.Allgrilles,
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shouldnotbe
attemptedbyunqualiedpersonnel.
Exposedunitswithoutductworkdonotrequireair
balancingotherthanselectingthedesiredfanspeed.
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.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
18
Water Treatment
Properwatertreatmentisaspecializedindustry.IEC
recommendsconsultinganexpertinthiseldtoanalyze
thewaterforcompliancewiththewaterqualityparameters
listedbelow,andtospecifytheappropriatewatertreatment
regimen.Theexpertmayrecommendtypicaladditivessuch
asrustinhibitors,scalingpreventative,antimicrobialgrowth
agents,oralgaepreventatives.Antifreezesolutionsmay
alsobeusedtolowerthefreezingpoint.
IECwatercoiltubesandheadersareconstructedofpure
copper.Multiplebrassalloysmaybepresentinthevalve
package,dependingonunitconguration.Itistheuser’s
responsibilitytoensurethetubeandpipingmaterials
furnishedbyIEC,arecompatiblewiththetreatedwater.
Failure to provide proper water quality will void the fan
coil unit’s warranty.
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
SECTION TWO — Start-Up, Cont'd.
Water System Balancing
Acompleteknowledgeofthehydronicsystem,alongwith
itscomponentsandcontrols,isessentialtoproperwater
systembalancing.Thisprocedureshould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,the
appropriatesystemoperatingconditionssuchasvarious
watertemperaturesandowratesshouldberecorded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undesiredvalve
operation.Aftertheentiresystemisbalanced,these
conditionswillnotexistonproperlydesignedsystems.
SECTION THREE – Controls Operation
Board Components and Specications
Beforepropercontroloperationcanbeveried,allother
systemsmustbeoperatingproperly.Thecorrectwaterand
airtemperaturesmustbepresentforthecontrolfunction
beingtested.Awiderangeofcontrols,electricaloptions
andaccessoriesmaybeusedwiththeequipmentcovered
inthismanual.Consulttheapprovedunitsubmittals,
orderacknowledgments,andotherliteraturefordetailed
informationregardingeachindividualunitanditscontrols.
Sincecontrolsandfeaturesmayvaryfromoneunitto
another,careshouldbetakentoidentifythecontrolsused
oneachunitandtheirpropercontrolsequence.Information
providedbycomponentmanufacturersregarding
installation,operation,andmaintenanceoftheirindividual
controlsisavailableuponrequest.

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
19
SECTION THREE – Controls Operation
1CN1–24VCustomerInput(Thermostat)
2 CN2–Changeover/ReturnAirSensor
3CN3–RemoteShutdownInput
4CN4–CondensateOverowSwitch
5CN5–TwoStageCooling
6CN6–Actuator7Aquastat
7 CN7–Transformer
8 CN8–LineServiceVoltage
9 CN9–PSCMotorConnection
10 CN10–ECMConnection
11 ECMFanSpeedAdjustment
12 GroundConnection
13 LEDDiagnostics(forMultimeterDiagnostics)
85 Control Board (E025-71481108)
Changeover/Return Air Sensor (CN2)
Pluggable T-Stat Connector (CN1)Remote Shutdown Input (CN3)
Overow Switch (CN4)
Two-Stage
Cooling (CN5)
Actuator & Aquastat (CN6)
Transformer (CN7) Line Service Voltage (CN8)
PSC Motor Connection (CN9)
ECM Connection (CN10)
ECM Fan Speed
Adjustment
LED Indication(s)
1
2
4
3
5
6
7 8
9
10
11
13
12

Cabinet Heater G*Y/D*Y Series
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
20
SECTION THREE – Controls Operation, Cont'd.
Board Function and Diagnostics
1. CN1 – 24V Customer Input (Thermostat)
Useproperwiregaugeandinsulationtypebasedonapplicationandlocalcoderequirements.
FordetailedIEC24Vthermostatcontrolwiringdiagrams,referencethermostatIOMs.
For Factory Installed IEC 24V Thermostat*
* DoesnotapplytoproportionalorLinevoltagethermostatcontrols.ThediagrambelowrepresentsafactoryinstalledIEC24Vthermostat.
Connection Function/Description
(+)10V Notused
(-)COM Groundcontrolpower
G3/HI FanHighSpeed
G2/MED FanMediumSpeed
G1/LOW FanLowSpeed
W1/HTG Heat
Y1/CLG Cool
W2/HT2 Heatstage2
Y2/CL2 Coolstage2
R/24V 24VControllerPower
COS Changeoversensor
RAS Roomairsensor
Figure 19. Thermostat wire harness connection
Figure 20. Mounted thermostat connection
*NOTE–ImagedepictsanIECunit-mountedVentureWi-FiThermostat.