Noritz CK-31 User manual

1
InCanada:
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Theconversionshallbecarriedoutinaccordancewiththerequirementsof
theprovincialauthoritieshavingjurisdictionandinaccordancewiththe
requirementsoftheCAN‐B149.1andCAN1‐B149.2InstallationCode.
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LACONVERSIONDOITÊTREEFFECTUÉECONFORMÉMENTAUXEXIGENCES
DEL'AUTORITÉPROVINCIALEAYANTJURIDICTIONETAUX,CSA‐B149.1,ET
CAN‐B149.2.
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InstallationGuide
ConversionKits:CK‐31,CK‐32,CK‐33,
CK‐34,CK‐42,CK‐43,CK‐44,CK‐45
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WARNING 
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Thisconversionkitshallbeinstalled
byaqualifiedserviceagencyin
accordancewiththemanufacturer’s
instructionsandallapplicablecodes
andrequirementsoftheauthority
havingjurisdiction.Theinformationin
theseinstructionsmustbefollowedto
minimizetheriskoffireorexplosion
ortopreventpropertydamage,
personalinjuryordeath.The
qualifiedserviceagencyisresponsible
fortheproperinstallationofthiskit.
Theinstallationisnotproperand
completeuntiltheoperationofthe
convertedapplianceischeckedas
specifiedinthemanufacturer’s
instructionssuppliedwiththekit.
WARNING 
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Cettetroussedeconversionnedoit
êtreinstalléequeparlereprésentant
d'unorganismequalifiéet
conformémentauxinstructionsdu
fabricantetàtouslescodeset
exigencespertinentsdel'autorité
compétente.Lesinstructionsdecette
noticedoiventêtresuiviesafinde
réduireauminimumlerisque
d'incendieoud'explosion,de
dommagematériel,deblessureoude
mort.L'organismequalifié
estresponsabledel'installation
adequatedecettetrousse.
L'installationn'estpasadéquateni
complètetantquelebon
fonctionnementdel'appareilconverti
n'apasétévérifiéselonles
instructionsdufabricantfourniesavec
latrousse.

2
*Aqualifiedserviceagencyisanyindividual,firm,corporationorcompanywhicheitherin
personorthrougharepresentativeisengagedinandisresponsiblefortheconnection,
utilization,repairorservicingofgasutilizationequipmentoraccessories;whoisexperiencedin
suchwork,familiarwithallprecautionsrequired,andhascompliedwithalloftherequirements
oftheauthorityhavingjurisdiction.
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*Conversionacceptableforinstalllocations0‐2,000feet.Seeheaterinstallationmanual
forprocedurestoadjustabove2,000feet.
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NORITZAmericaCorporation
11160GraceAvenue
FountainValley,CA92708
866‐766‐7489
www.noritz.com
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CK‐IM‐6
Rev.04/16
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3
1.BeforeConversion
Beforeattemptingtoconvertaunit,verifythattheproperkithasbeenpurchasedforthemodel
type*:
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ConversionKitModelConversionType
CK‐31NRC98‐DV
GQ‐C2857WS‐FFUS
PropanetoNaturalGas
CK‐32NaturalGastoPropane
CK‐33NRC98‐OD
GQ‐C2857WSUS
PropanetoNaturalGas
CK‐34NaturalGastoPropane
CK‐42NRC83‐DVPropanetoNaturalGas
CK‐43NaturalGastoPropane
CK‐44NRC83‐ODPropanetoNaturalGas
CK‐45NaturalGastoPropane
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*Themodeltypecanbeverifiedfromtheratingplatelocatedonthefrontcoverofthewater
heater.
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ToolsRequired:
NoritzRemoteController(RC‐7651M)
Manometer(Capableofdisplayingdigitsintenths(i.e.2.4)andupto20”W.C.)
Philipsscrewdriver(#2Recommended)
Pliers
Gasleakagedevicedetector
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NOTE:DonotattempttoperformaconversionwithoutaccesstoamanometerandaNoritz
remotecontroller.Adigitalmanometerisrecommended.

4
2.IncludedParts
Thefollowingpartsaresuppliedinthe
conversionkit.Checkforanymissing
itemsbeforestartingtheconversion.
3.ConversionProcedure
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PartsShapeQuantity
ManifoldPlate
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1
O‐Ring
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2
MainDamper
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1
NewInletandManifoldPressure
RatingSticker(English)
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1
NewInletandManifoldPressure
RatingSticker(French)
‐DVonly
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1
Date,GasType,KitNumber,Nameof
CompanySticker(English)
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1
Date,GasType,KitNumber,Nameof
CompanySticker(French)
‐DVonly
1
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PartsReplacement:
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1) Ifthedisplayontheremotecontrollerison,turnofftheunitbypressingthe“ON/OFF”
buttonontheremotecontroller.Thereshouldbenodisplayontheremotecontroller.
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2) Turnoffelectricalpowertoheaterbydisconnectingtheelectricalplugfromtheoutlet
orshutoffthebreakerprovidingpowertowaterheater.
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3) Turnoffthegassupplytothewaterheaterbyclosingthegasshut‐offvalve.

4) Removethefrontcoveroftheunitbyremovingthe4screwsholdingittothecase.

5
GasPipe
FIGURE1FIGURE2
5) Locatethecoloredwireconnectorsfromtheelectricalsolenoidsonthemanifoldfrom
thelocationsindicatedinFigure1onthefollowingpage.Followthewirestoawhite
clipanddisconnectit.Disconnectthegaspipefromthegassupplyinletbyremoving
theC‐Clampatthebottomofthegaspipe(Figure2).Foreasieraccessremovethe
mountingplatewiththecurrentleakagesafetydeviceinfrontofthegaspipe.
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 
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6) Thenlocateandremovethe4screwswithaPhilipsscrewdriver(Figure1).DoNOTuse
apowerdrill.Oncescrewsareremoved,pullthegaspipefromthegasfitting.When
thepipeandmanifoldhavebeendetached,removethegaspipefromthemanifoldinlet.
Remembertoremovethemanifoldscrew.Thiswillbeusedonthenewmanifold
plate.Discardtheoriginalmanifoldplate.
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WHITE
(
BACK
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O‐Ring
GasPipe
C‐Clamp
DisconnectWhiteClip
Remove
Manifold
Screw
GRAYORANGEBLACK
REDBLUE
O‐Ring

6
FIGURE3
FIGURE4
7) Aftermanifoldplateisremoved,theexistingdamperwillbeexposedasindicatedin
Figure3below.Removescrews(1),(2),(3),andthenpullthedamperofftheburner
assembly.Checkforpropersizeofdamperwiththechartbelowandreplacewithnew
damperthatwasincludedwithyourgasconversionkit.
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8) LocatetheblackO‐ringsonthegaspipeasindicatedin
Figure2&4.Iftornordamaged,removeandreplaceO‐
ringswiththenewO‐ringssuppliedintheconversionkit.
DiscardtheoldO‐rings.
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9) Insertthenewmanifoldplatesuppliedwiththe
conversionkit.Theorificesizeofthegasmanifoldplate
shouldbemarkedasfollows(checkFigure5):
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IdentifyingtheProperManifoldPlateperGasType:
ForNRC98‐DV,GQ‐C2857WS‐FFUSandNRC83‐DVmodels:
TofireNaturalGas(NG)–2.6
TofirePropaneGas(LP)–1.6
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ForNRC98‐OD,GQ‐C2857WSUSandNRC83‐ODmodels:
TofireNaturalGas(NG)–2.5
TofirePropaneGas(LP)–1.5
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
DONOTcontinuewithconversionifmanifoldplateisincorrect.
ModelNameGas
Conversion
Damper
Size
NRC98‐DV
GQ‐C2857WS‐FFUS
NGtoLP17‐16
LPtoNG17‐12
NRC98‐OD
GQ‐C2857WSUS
NGtoLP17‐15
LPtoNG17‐12
NRC83‐DVNGtoLP17‐16
LPtoNG17‐12
NRC83‐ODNGtoLP17‐15
LPtoNG17‐12
(Ex:13=NR98‐DV‐NG)
FIGURE5
O‐Ring
(
Black
)

7
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10) MakesurethattheO‐Ringissecuredproperlyinplace.Failuretodosowillcausegas
leaks,possiblyresultinginseverepersonalinjuryordeath.
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11) OnceO‐ringisinplace,slidethegaspipeintothemanifoldinlet.Makesurethatthegas
pipeiscompletelyinsertedintothemanifoldinletinordertopreventanygasfrom
leaking.
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12) Insertgaspipeintothegassupplyinletandholdthemanifoldplateinplace.
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13) SecurethenewmanifoldplatetotheunitusingthescrewsremovedinStep7.The
screwsneedonlytobehandtightenedandshouldnotbetightenedusingadrill.First,
insertscrews1‐4fromFigure1,butdonotfullytightenthesescrews.Onceallscrews
areinserted,proceedtocompletelytightenscrews1‐4.
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NOTE:Whentighteningthescrews,becertaintonotapplyexcessforceasthescrewsshould
turneasily.Ifextraforceisrequired,stop,removethescrewandtightenbyhandfirst.Excess
forcecanstripouttheoriginalholes.

14) AttachC‐Clampatthebottomofthegaspipe(Figure2).Failuretodosowillcausegas
leaks,possiblyresultinginseverepersonalinjuryordeath.

15) Reconnectthewhiteclipthatcontainsthewirestotheelectricalsolenoidsonthe
manifoldfromthelocationsindicatedinFigure1.

16) Beforereplacingthefrontcover,theunitmustbeadjustedandtestedasdescribedin
thenextsection.
Adjustments:

1) Beforeelectricalpowerisappliedtotheunit,installaremotecontrollertotheunitifit
isnotalreadyinstalled.

2) Reconnecttheelectricalpowertotheunit.

3) Withinthefirsttenminutesofconnectingelectricalpowertotheunit,butbefore
pressingthePowerON/OFFbutton(displayshouldbeblank),holdtheupbuttononthe
remotecontrolleruntilthedisplayblinks“99”.ThiswillputtheunitintoMaintenance
Writermode.IfpressingtheupbuttondoesnotputtheunitintoMaintenanceWriter
mode,makesuretheremotedisplayisblank,unplugtheunitforsixtyseconds,andtry
again.

4) AfteraccessingtheMaintenanceWritermode,usethe“up”and“down”buttonsto
changetheMaintenanceWriteritemnumberdisplay.Pressingthe“FLOWMETER
ALARMSET”buttonfor0.5secondswillchangetheitemnumbersettingfrom“ON”to
“OFF”.IfthePrioritylampisflashingwhenanitemnumberisdisplayed,thisindicatesan
“ON”settingforthatitemnumber,andifthePrioritylampisoff,theitemnumberis
“OFF”.

8
5) Change“FC”and“FE”fromOFFtoON.Theprioritylightshouldbeflashingonbothitem
numbersafterpressingthe“FLOWMETERALARMSET”.

6) Choosetheproperconversionsettingfromthechartbelowandsetthe“A1”
MaintenanceWriteritemnumberaccordingtothechartbelow.

NOTE:DONOTchangetheotheritemnumbers.Thiswillcauseafaultinthewaterheater.



ON:“Priority”lightisflashing.
OFF:“Priority”lightisoff.



7) Aftersettingthe“A1”itemnumberforthedesiredgastype,pressandholdthe“up”
and“down”buttonstogetherforfivesecondstoconfirmthenewsettings.Theremote
controllerwillemitatoneandthedisplaywillgoblankwhenthesettingsareconfirmed.
Ifthisisnotdone,theunitwillnotputthesettingchangesintoeffect.

NOTE:ThesettingchangescanbecancelledbypressingthePowerON/OFFbutton
beforeconfirmingthesettings,oriftheunitisleftalonefortenminuteswithout
confirmingthesettings.Ifthedefaultsettingneedstobechangedagain,disconnectthe
electricalpowertotheunit,reconnectitandrepeatthisprocedure.


Testing:

1) Beforeturningonthegassupplytotheunit,verifythattheinletgassupplypressureis
withinthefollowingoperatingranges:
a. NaturalGasSupply:Min.4–Max.10.5inches
b. PropaneSupply:Min.8–Max.14inches

NOTE:Ifthesupplypressureishigherthanthemaximumallowablepressure,adjustthe
pressureattheregulatororinstallasecondaryregulatoronthesupplylineconnectedtothe
waterheater.DONOTattempttooperateheaterifgassupplypressureisnotwithinranges
specifiedabove.Highsupplypressurecandamagetheunitandpossiblycauseagasleak.

Next,verifythesupplypressureattheunit.Tocheckthegassupplypressuretotheunit,atap
isprovidedonthegasinlet(Figure6below).

Makesuregassupplyisturnedofftotheunit.RemovethehexheadPhilipsscrewfromthetap.
A9/32”nutdriverisrecommendedfortheremovalofthisscrew.Ifanutdriverisnotavailable,
aPhilipsscrewdrivercanbeused.Gentlyremovethescrew,soasnottostripoutthescrew.




ModelsDesiredGasType A1
NRC98‐DV,NRC98‐OD,
GQ‐C2857WS‐FFUS,
GQ‐C2857WSUS, 
NRC83‐DV,NRC83‐OD
NaturalGasON
PropaneOFF

9
2) Connectamanometertothetapbyusinga
siliconetube.Turnongassupplytounitand
confirmthesupplypressure.

3) Aftersupplypressuretoheaterhasbeen
confirmed,turnoffthegassupply,removethe
manometertubeandreplacethehexheadscrew.


4) Themanifoldpressurewillalsohavetobechecked
usingamanometer(digitalmanometeris
suggested).Inordertocheckthegasmanifold
pressure,atapisprovidedonthemanifoldplate
insidetheunit(Figure7).Thepressurecanbe
checkedeitherbyremovingthePhilipsheadscrew
(1)andconnectingamanometerwithasilicon
tube,orbyremovingthe1/8”NPTscrew(2)with
anAllenwrenchandconnectingtheappropriate
pressuregauge.Besuretozerooutthe
manometerbeforeattachingittothetap.
5) Turnonthegassupplytotheunit.

6) Beforefiringtheunit,checkforgasleaksatthegas
inletfittingandaroundthemanifoldplateusinga
gasleakdetectiondevice.

7) Ifnotalreadyon,pressthePower“ON/OFF”buttonsothattheunitisinstandbymode.
Theprioritylightshouldbeon.

8) Openupseveralhotwaterfixtures(highflowrateisrequiredthroughtheunit)and
allowtheunittogothroughitsstartupsequence.Itmaytakeseveralignitionattempts
inordertopurgeairfromthegaschambers.Ifan“11”codeappearsontheremote
controller,resettheunitbypressingthePowerbuttonontheremotecontrolleroffand
thenonagain.













FIGURE6
FIGURE7

10
FIGURE9
9) Oncetheheaterhasignitedandhasbegunto
runcontinuously,locatethemanifold
adjustmentbuttonsontherightsideofthe
circuitboard(Figure8).

10) Pressandholdthemaximumpressureset
button.Verifyfromthetablesbelowthatthe
appropriatepressureisreadfromthe
manometer.Ifthepressureneedsadjustment,
usethemanifoldpressureincreaseand
decreasebuttonstoadjusttothecorrect
pressure,whilecontinuingtoholddownthe
maximumpressuresetbutton.

11) Pressandholdtheminimumpressureset
button.Verifyfromthetablesonthefollowing
pagethattheappropriatepressureisread
fromthemanometer.Ifthepressureneeds
adjustment,usethemanifoldpressure
increaseanddecreasebuttonstoadjusttothe
correctpressure,whilecontinuingtohold
downtheminimumpressuresetbutton.















ManifoldGasPressureMaximumandMinimumValues

Afterthemanifoldpressureshavebeenconfirmed,
verifythattheflameisasteadybluecolorusingthe
inspectionwindow(Figure9).




12) Turnoffwaterandgastounit.Replacescrew
frommanifoldtapandturngasbackontounit.

13) Performafinalgasleakcheckaroundtheentire
manifoldplate,especiallynearthegaspipeand
manifoldinlet,usingagasleakdetectiondevice.

ModelNameGasTypeSupplyPressure
(inchH2O)
ManifoldPressure(inchH2O)CoverOff
MaxValueMinValue
NRC98‐DVNG7.93.011.12
LP11.03.851.50
NRC98‐ODNG7.92.600.95
LP11.03.651.25
GQ‐C2857WS‐FFUSNG7.93.050.90
LP11.03.851.00
GQ‐C2857WSUSNG7.92.650.80
LP11.03.701.00
NRC83‐DVNG7.92.951.10
LP11.03.601.35
NRC83‐ODNG7.92.600.95
LP11.03.651.25
FIGURE8
BurnerWindow

11
14) Iftheremotecontrollerneedstoberemoved,disconnectelectricalpowertoheaterand
proceedtoremovecontrollerconnections.


Applyconversionlabels:

1) Replacethefrontcoveroftheunitusingthe4screwspreviouslyremoved.

2) Locatethe2conversionstickersinEnglishsuppliedintheconversionkit.*Forwater
heaterscertifiedforuseinCanadalocatethe2conversionstickersinFrench.

3) Placethestickerindicatingthenewinletandmanifoldpressuresdirectlyabovethe
ratingstickersoasnottocoveranyexistingmarkingsasindicatedby“A”inFigure10.
*ForwaterheaterscertifiedforuseinCanadaplaceFrenchstickerwithnewpressures
nexttoEnglishsticker.

4) Fillouttherequiredinformationontheremainingstickerindicatingthedate,gastype,
kitnumber,andnameofthecompanyperformingtheconversion.Placethisstickeron
thefrontcoverasindicatedby“B”inFigure10.Donottocoveranyexistingmarkings.
*ForwaterheaterscertifiedforuseinCanadaplaceFrenchstickerwithagency
informationnexttoEnglishsticker.



























FIGURE10
NRC83‐DV,NRC98‐DV
&GQ‐C2857WS‐FFUS NRC83‐OD,NRC98‐OD &GQ‐C2857WSUS

12
InstallationChecklist:

PartsReplacement:

□Removeexistingmanifoldplate,maindamper,andO‐ring.Discardtheseparts.
□Replacewithnewmanifoldplate,maindamper,andO‐ring.
□Makesurethatmanifoldplate,maindamper,andO‐ringaresecurelyinplace.

Adjustments:

□AccessMaintenanceWritermodeandsettheA1itemnumbertodesiredgastype.
□Confirmgastypesettings.

Testing:

□Beforeopeninggasvalvetoheater,verifythatgassupplypressureiswithinoperating
rangeofheater.
□Ifgassupplypressureisnotwithinspecification,adjustthepressureattheregulatoror
installasecondaryregulatoronthesupplylineconnectedtothewaterheater.
□RemovehexPhilipsscrewfrominletofNoritzheaterandconfirmgassupplypressureat
unitwithmanometer.Replacescrewafterconfirmationofgassupplypressure.
□RemovehexPhilipsscrewor1/8”NPTscrewfromgasvalveandconnectmanometerto
gasvalve.
□Checkforgasleaksaroundgasinletfittingandmanifoldplateusingagasleakdetection
device.
□Checkandconfirmcorrectmanifoldpressures.Makeadjustmentsifnecessary.Replace
screwaftermanifoldpressureshavebeenconfirmed.
□Performfinalgasleakcheckagainwithgasleakdetectiondevice.

ApplyConversionLabels:

□PlaceNewInletandManifoldPressureRatingStickeraboveratingstickeronfrontcover.
□FilloutinformationonDate,GasType,KitNumber,NameofCompanyStickerandplace
onfrontcover.
□IncludeFrenchstickersforwaterheaterscertifiedforuseinCanada.