Noritz NCC300OD User manual

SBB80YY-2
Rev. 08/17
Models : NCC300DV (GQ-C5032WZ-FF US)
NCC300OD (GQ-C5032WZ US)
CONDENSING TANKLESS GAS WATER HEATER
Owner’s Guide
NORITZ America Corporation
-Donotstoreorusegasolineorotherammablevaporsandliquidsinthe
vicinityofthisoranyotherappliance.
- WHAT TO DO IF YOU SMELL GAS
•Donottrytolightanyappliance.
•Donottouchanyelectricalswitch;donotuseanyphoneinyourbuilding.
•Immediatelycallyourgassupplierfromaneighbor’sphone.Followthe
gassupplier’sinstructions.
•Ifyoucannotreachyourgassupplier,calltheredepartment.
-Installationandservicemustbeperformedbyaqualiedinstaller,service
agencyorthegassupplier.
If the information in this manual is not followed exactly, a re or explosion
may result causing property damage, personal injury, or death.
WARNING
FOR USE IN COMMERCIAL OR MANUFACTURED HOME APPLICATIONS.
*SBB80YY*
Thank you for purchasing this Noritz Tankless Gas Water Heater.
Before using, please:
Read this manual completely for operation instructions.
See the warranty registration card (included separately), and then visit
the Noritz website (www.noritz.com/warranty) to register your product.
Keep this manual (and the warranty registration card) where it can be
found whenever necessary.
Installation must conform with local codes, or in the absence of local
codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54 - latest edition
and/or the Natural Gas and Propane Installation Code CSA B149.1 -
latest edition.
When applicable, installation must conform with the Manufactured
Home Construction and Safety Standard, Title 24 CFR, Part 3280 or the
Canadian Standard CAN/CSA-Z240 MH Mobile Homes, Series M86.
Noritz America reserves the right to discontinue, or change at any
time, the designs and/or specications of its products without notice.
CERTIFIED
R
Low NOx Approved
by SCAQMD
14 ng/J or 20 ppm
(Natural Gas Only)

2
Prohibited Don’t
touch.
Don’t
disassemble
the equipment.
Don’t touch
with a wet
hand.
No ame.
High
Temperature.
To prevent damage to property and injury to the user, the icons shown below will be used to warn of
varying levels of danger.
Every indication is critical to the safe operation of the water heater and must be understood and observed.
Potential dangers from accidents during installation and use are divided into the following four
categories. Closely observe these warnings; they are critical to your safety.
Other icons
DANGER
WARNING
CAUTION
DANGER indicates an imminently hazardous situation which,
if not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
CAUTION used without the safety alert symbol indicates a potentially
hazardous situation which, if not avoided, may result in property damage.
CAUTION
Be sure
to do. Ground.
Electric
Shock.
DANGER
 Iconswarningofrisklevel
ImportantSafetyInformation-1
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
Vaporsfromammableliquidswillexplodeandcatchrecausingdeathorsevereburns.
Do not use or store ammable products such as gasoline, solvents or
adhesives in the same room or area near the water heater.
Prohibited
Keepammableproducts:
1.Farawayfromthewater
 heater.
2.Inapprovedcontainers.
3.Tightlyclosed.
4.Outofchildren’sreach.
Vapors:
1.Cannotbeseen.
2.Vaporsareheavierthanair.
3.Goalongwayontheoor.
4.Canbecarriedfromotherrooms
tothemainburnerbyaircurrents.
HotWaterHeatertemperaturesover125°F(52°C)cancausesevereburns
instantlyordeathfromscalding.
Children, disabled and elderly are at the highest risk of being scalded.
Feel water temperature before bathing or showering.
Temperature limiting valves are available, ask professional person.
Prohibited
(Continued)

3
No ame.
(Continued)
WARNING
Be sure
to do.
Whenagasleakisnoticed:
1. Stopuseimmediately.
2. Closethegasvalve.
[NCC300DV]
3. Openwindowsanddoors.
Ifyoudetectabnormalcombustion
orabnormalodors,orduringan
earthquake,tornadoorre:
1. Turnoffthehotwatersupply.
2. Turnoffthepowertothewater
heater.
3. Turnoffgasandwatersupply
valve.
4. CallthenearestNoritzagent.
Be sure
to do.
Donotallowanyonetochangethewater
temperaturewhilehotwaterisbeingused.
To prevent scalding, do not change the
water temperature to a higher setting.
Prohibited
A.Thiswaterheaterdoesnothave
apilot.Itisequippedwithan
ignitiondevicethatautomatically
lightstheburner.Donottryto
lighttheburnerbyhand.
B. BEFORE OPERATING smell all
aroundthewaterheaterareafor
evidenceofleakinggas.Besure
tosmellnexttotheoorbecause
somegasisheavierthanairand
willsettleontheoor.
 WHATTODOIFYOUSMELLGAS.
•Donottrytolightany
appliance.
•Donottouchanyelectrical
switch;donotuseanyphone
inyourbuilding.
• Immediatelycallyourgas
supplierfromaneighbor’s
phone.Followthegassupplier’s
instructions.
• Ifyoucannotreachyourgas
supplier,calltheredepartment.
C. Useonlyyourhandtoturn
thegasvalveknob.Neveruse
tools.Iftheknobwillnotturnby
hand,don’ttrytorepairit.Call
aqualiedservicetechnician.
Forceorattemptedrepairmay
resultinareorexplosion.
D. Donotusethiswaterheaterif
anyparthasbeenunderwater.
lmmediatelycallaqualied
servicetechniciantoinspectthe
waterheaterandtoreplaceany
damagedparts.
(Continued)
Prohibited
Checkthetemperature
oftherunninghotwater
beforeenteringthe
shower.
Checkthetemperature
beforesteppinginto
thebathtub.
High
Temperature.
ExplosionHazard;
Ifthetemperatureandpressurerelief
valveisdrippingorleaking,havea
qualiedservicetechnicianreplaceit.
Donotplugorremovethevalve.
Failure to follow these instructions can re-
sult in re or explosion, and personal injury
or death.
Prohibited
[NCC300DV]
Do not use the water heater
iftheintake/exhaustpipe
isdisplaced,hasholes,is
cloggedoriscorroded.
Afterthewaterheaterhasbeenoutof
useforalongtimemakesurethatyou
llthecondensatetrapwithwater.
Thisistopreventdangerous exhaust
gasesfromenteringthebuilding.
Failuretollthecondensatetrapcould
resultinseverepersonalinjuryordeath.
(Refertopage34forfurtherinstructions.)
Be sure
to do.
Prohibited
[NCC300OD]
DoNotInstallIndoors.
This will cause carbon
monoxide poisoning and
a potential re hazard. Indoor
Be sure
to do.
[Whensupplyingcombustionair
fromtheindoors]
Checkwhetherornottheair
supplyventisblockedwith
dust,trash,atowel,orthelike.
Blocking the opening may result
in incomplete combustion.
Towel
Air supply vent

4
Donotplacetheexhaustventterminal
inanindoorenvironmentbymeansof
adding walls and ceiling (Do not en-
closeusingcorrugatedsheets,etc.)
Carbon monoxide poisoning or re may
occur as a result.
ImportantSafetyInformation-2
(Continued)
Ifthisunitwillbeinstalledinabeauty
salon or other location where hair
sprayoraerosolswillbeused,locate
the unit in a separate area that is
suppliedwithfreshairfromoutdoors.
Prohibited
Besurethegas/power
supplied matches the
gasontheratingplate.
Ex.ForNaturalGas
(NCC300DV (GQ-C5032WZ-FF US))
Installationandservicemustbe
performedbyaqualiedinstaller,
serviceagencyorthegassupplier.
Be sure
to do.
Be sure
to do.
(Continued)
Prohibited
Do not store or use gasoline or other
ammablevaporsandliquidsinthe
vicinityofthisoranyotherappliance.
Prohibited
Donotplaceoruseaspraycan near
thewaterheaterortheexhaustvent
terminal.
Donotusehairsprayorspray
detergentinthevicinityofthe
heater.
Prohibited
Prohibited
[NCC300DV]
Donotplaceoutdoors.
Rain may enter the unit or the
burner fire may be blown by
the wind, causing malfunction
or re as a result.
Prohibited
Outdoor
Leavetheproperclearancebetween
thewaterheaterandnearbyobjects
(trees,timber,boxeswithammable
materialsetc.).
Be sure
to do.
*Indicates suggested clearances for maintenance.
Donotplacecombustiblessuchas
laundry,newspapers,oilsetc.nearthe
heaterortheexhaustventterminal.
Prohibited
Donotusecombustiblechemicals
suchasoil,gasoline,benzeneetc.
intheneartheheaterortheexhaust
ventterminal.
Prohibited
CarbonMonoxidePoisoningHazard.
Do not install this water heater in
arecreationalvehicleoronaboat.
Do not install this water heater
inamobilehomewhenusingSV
conversionkit(“-SV”conguration).
Prohibited
WARNING
Left side:
Min. 3” (75mm)
Right side:
Min. 3" (75mm)
Front:
Sug. 24" (600mm)*
Sug.3" (75mm)
from vent pipe*
Upper:
Min. 12" (300mm)
Exhaust vent
terminal
Exhaust vent
terminal
Unit
[NCC300DV]
Left side:
Min. 6" (150mm) Right side:
Min. 6" (150mm)
Upper:
Min. 36" (900mm)
[NCC300OD]
Unit
Front:
Sug. 24" (600mm)*
Be sure
to do.
[Whensupplyingcombustionair
fromtheindoors]
Checktheairsupplyopening
fordustorobstructions.
Clogged
air supply
opening!!

5
(Continued)
Donotallowsmallchildrentoplay
unsupervisedinthebathroom.
Donotallowsmallchildrentobathunsupervised.
Do not touch the power
cordwithwethands.
Electric
Shock.
Don’t touch
with a wet
hand.
Prohibited
ContactNoritzbeforeusingwith
asolarpre-heater.
Contactaqualiedservice
technicianforanynecessary
repairs,serviceormaintenance.
ConsultthenearestNoritzagentif
the water heater location needs to
bechanged.
Don’t
disassemble
the equipment.
Be sure
to do.
Be sure
to do.
CaliforniaProposition65listschemicalsubstances
knowntothestatetocausecancer,birthdefects,
death,seriousillnessorotherreproductiveharm.
Thisproductmaycontainsuchsubstances,
betheiroriginfromfuelcombustion(gas,oil)
orcomponentsoftheproductitself.
CAUTION
Thegasconversionkitshallbeinstalledbya
qualiedserviceagencyinaccordancewith
themanufacturer’sinstructionsandall
applicablecodesandrequirementsofthe
authorityhavingjurisdiction.The
informationintheinstructionsmustbe
followedtominimizetheriskofreor
explosionortopreventpropertydamage,
personalinjury,ordeath.Thequalied
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
speciedinthemanufacturer’sinstructions
suppliedwiththekit.
Besuretoelectricallygroundthe
unit.
Keeppowercordfreeofdust.
Ground.
Be sure
to do.
Donotusethewaterheaterfor
otherthanhotwatersupply,shower
andbath.
Prohibited
Prohibited
Donotcoverthewaterheaterand
theexhaustventterminal,storetrash
ordebrisnearit,orinanywayblock
theowoffreshairtotheunit.
Donotturnoffthewaterheater
whilesomeoneisbathing.
Prohibited
Donotuseabrokenormodiedpowercord.
Donotbind,bendorstretchpowercords.
Donotscratch,modify,orsubjectthemto
impactorforce.
Donottouchtheexhaustventpipeand
exhaustventterminalduringorimmediately
afteroperationofthewaterheater.
Do not install in locations where
excessivedustordebriswillbe
intheair.
Prohibited
Don’t
touch.
Prohibited
Be sure
to do.
Topreventburnsorscalding,turnoffthe
powerbuttonandwaituntiltheequipment
coolsbeforeperformingmaintenance.
Donotusecondensate,discharged
fromthedrainpipe,fordrinkingor
forconsumptionbyanimals.
Iftheunitisinstalledinalocationwith
veryhighhumidity,condensatemayform
insidetheunitand/orcauseincomplete
combustion,damagetotheelectrical
components,orelectricleakage.
Prohibited
Prohibited
[NCC300DV] [NCC300OD]

6
ImportantSafetyInformation-3
CAUTION
Donotdrinkwaterthathasbeeninsidethe
unitforanextendedperiodoftime.Donot
drinktherstuseofhotwaterfromthe
unitinthemorning.
Cleanthelteronthewaterinletas
frequentlyasrequiredbythequalityof
yourlocalwater.
Keeptheareaaroundtheunitclean.
If boxes, weeds, cobwebs, cockroaches etc. are in
the vicinity of the unit, damage or re can result.
Donotinstalltheequipmentwherethe
exhaustwillblowonwallsorwindows.
Problemsresultingfromscaleformation
arenotcoveredbythewarranty.
Thisunitisonlyapprovedforinstallation
upto4500ft.(1350m)abovesealevel.
For installations at higher elevations, contact Noritz
America for Instructions.
Checkignitionduringuseandextinction
afteruse.
Ifthewatersupplyisinexcessof12grains
per gallon (200 mg/L) of hardness, acidic
orotherwiseimpure, treatthewaterwith
approved methods in order to ensure full
warrantycoverage.( p.37) Preventingdamagefromfreezing( p.32)
Damage can occur from frozen water within the
device and pipes even in warm environments.
Be sure to read below for appropriate measures.
Repairs for damage caused by freezing are not
covered by the warranty.
Takenecessarymeasurestoprevent
freezingofwaterandleakageofgaswhen
leavingtheunitunusedforlongperiodsof
time.( p.33)
Donotusepartsotherthanthosespecied
forthisequipment.
Ifitissnowing,checktheexhaustvent
terminalforblockage.
Donotdisassembletheremotecontroller.
Donotusebenzene,oilorfatdetergents
tocleantheremotecontroller.
This may cause deformation.
Donotgettheremotecontrollerwet.
It is not water resistant, water can cause damage.
Do not splash water on the remote
controller.Donotexposetheremote
controllertosteam.
Do not locate the remote controller near stoves or
ovens, this may cause damage or failure.
Do not run water through the unit when
unitisnoton.
When discharging hot water, make sure the unit is ON.
If water is run through the unit with the unit
OFF, water may condense inside the unit and cause
incomplete combustion or damage to the internal
electrical components.
For single-handle xtures, you’d turn the handle to
the left.

7
 ImportantSafetyInformation....................................................................... 2
Contents......................................................................................................... 7
 OverviewofCondensingTanklessGasWaterHeater.............................. 8
 RC-9018MOperationOverview.................................................................... 9
General Parts
Main Unit................................................................................................... 11
Remote Controller.................................................................................... 12
 SystemCheck............................................................................................... 14
Initial Operation............................................................................................ 16
 ForAllSystems
 ClockAdjustment...................................................................................... 17
Using the Water Heater............................................................................. 18
Setting Hot Water Temperature................................................................ 19
AutomaticWaterHeater“ON”or“OFF”Operation............................... 20
 LockingtheRemoteController................................................................ 22
 CustomizableSettings<Miscsettings>.................................................. 23
 ForSystem[Rcrc]
EnablingAutomaticRecirculationOperation......................................... 26
 ManuallyStartingRecirculationOperation............................................ 27
SettingtheRecirculationSystemOperationTimer............................... 28
 SingleWaterHeaterOnly
Flow Meter Alarm...................................................................................... 30
 PreventingDamagefromFreezing............................................................. 32
Regular Maintenance................................................................................... 35
 Troubleshooting........................................................................................... 38
 Follow-upService........................................................................................ 43
 Specications............................................................................................... 46
 DefaultSettings............................................................................................ 47
Contents

8
Cold wate
r
Cold wate
r
Gas Gas Hot water Hot water
Condensate
Combustion gas
About
400˚F (200˚C)
Exhaust Exhaust
About
120˚F (49˚C)
Conventional
type
Condensing
Tankless Gas
Water Heater
Water is heated
using the exhaust
gas which is about
400˚F (200˚C)
.
Primary heat exchanger
Primary heat exchanger
Secondary heat exchanger
condensate trap
Combustion gas
About
400˚F (200˚C)
About
400˚F (200˚C)
Thecondensingtanklessgaswater
heaterdischargescondensate.
When heat from the exhaust gas is collected within
the secondary heat exchanger, condensation occurs
from moisture in the exhaust gas and the resulting
water is discharged from the drain pipe (approx.
3 gallons/hour (11.3 liters/hour) maximum). It is not
a water leak. Do not plug or block the drain line as it
must always be allowed to freely ow.
Note : The condensate discharged is acidic with a pH
level of approximately 2-3.
A condensate neutralizer may be required by
local code prior to disposal.
Drain pipe
(Installation example)
OverviewofCondensingTanklessGasWaterHeater
This water heater is a high efciency, fully condensing appliance. Unlike a traditional tankless water
heater, a condensing type captures heat from the exhaust gas and uses it to preheat the incoming
cold water as it passes through the secondary heat exchanger as illustrated below.
Thecondensingtanklessgas
water heater tends to show
whitesteam.
After the exhaust gas passes through the
secondary heat exchanger, the low temperature
and high moisture content tends to produce
steam at the vent discharge terminal.
This is a normal occurrence.
Condensate
comes out from
here.
During combustion, white
steam may often be seen.
This is normal.

9
RC-9018MOperationOverview-1
PowerSavingMode
If you set "Powersave dsply" to "Yes" ( p.23),
unnecessary power consumption by the remote
controller is prevented. If approximately ten minutes
pass without using hot water or without pressing a
button, the display of the remote controller turns off.
Thissettingisadjustable p.23
[Whenusingonlyonewaterheater:]
Itispossibletosettheremotecontrollerto
alert the user when the
bathtubhasreached
apresetfillvolume
topreventoverfilling.
p.30
Itispossibletolock
remote controller
operation.
p.22
Itispossibleto
automaticallyturn
the water heater
“ON”or“OFF”.
[Forrecirculationsystems( )]
Itispossibletocirculatehotwateronly
duringpreferredtimesofday.
p.20 p.28
Automatically
turned "ON"
Automatically
turned "OFF"
Pi Pi !!



Basic operation
Theinitialsettingissetto"Powersavedsply:No-1"
* If you use hot water or press a button, "Powersave dsply" is released.
If you press the PROG button only once, "Powersave dsply" is released and the automatic program
function will operate.
* If the setting temperature is set to 125°F/55°C or more, "Powersave dsply" will not function to prevent
accidental scalding.
* If "Recirc" is operating, "Powersave dsply" will not function.
Thedisplayturnsoff
(operation is "ON")

10
RC-9018MOperationOverview-2
Theremotecontrollercanbecustomizedbasedonthepreferenceoftheuserinthefollowingways:
The remote controller
displaycanbeturned
offtosavepower.
Theclockdisplaycanbe
showneventhoughthepower
ON/OFF buttonissetto"OFF".
What time is it now?
Can I save
power?
Thebrightnessofthe
remotecontrollercanbe
adjustedfor
bettervisibility.
Additional Settings
p.25"DrainingtheWaterHeater"Drainingthewaterheater(freezeprevention).
p.25"RestoringDefaultSettings"Restoringdefaultremotecontrollersettings.
Thesettemperaturecanbe
restrictedtoamaximumlevel
topreventhightemperature
settingsfrom
beingselected.
p.23
Theremotecontrollercanbe
muted so that it does not emit a
tonewhenabuttonispressed.
Pi
Pi ! Pi !
UserPreferences
AdjustingtheMaximum
Output Temperature
RemoteControllerDisplay
Brightness Settings p.24
Theremotecontrollercanbe
muted so that it does not emit
atonewhenanerroroccurs.
PowerSavingModes p.23
Error Tone Settings p.24
Muting the
Remote Controller p.24

11
[NCC300DV (GQ-C5032WZ-FF US)]
IndoorWallMounted,PowerVent/SealedModel
* Theaboveillustrationshowsanexampleofinstallation.
The exact installation conguration may be slightly different.
FrontCover
(Inside Water Inlet)
(p.36)
PressureReliefValve
GeneralParts-1
IntakePipe
Flue Collar
GasSupplyValve
Drain Pipe
Discharges the
condensate.
[NCC300OD (GQ-C5032WZ US)]
OutdoorWallMounted,PowerVentedModel
ExhaustVent
Main Unit
WaterDrainValve
(with Water Filter)
WaterSupplyValve

12
General Parts -2
RemoteController(RC-9018M)
The remote controller will emit a tone when a button is pressed.
Activates the automatic water heater power
“ON” or “OFF” setting as determined by the
user selected schedule. ( p.21)
For turning the water heater
on/off.
(Next page)
Locks remote controller
operation. ( p.22)
Check the status of the
system or the number of
installed units ( p.14)
Returns to the previous
screen while making system
settings or checking status.
Confirms changes
made by the user.
For setting the hot water
temperature ( p.19),
the flow meter alarm,
and other settings.
Remote Controller
Part Number
* Use to change system
settings or to return to
the home screen.
* If you press the menu button
and press the temperature
setting buttons,
is sometimes displayed,
however, do not use this
mode as it meant for
installation or service
personnel only.
Stops the tone that is emitted
when an error occurs. ( p.42)
Covershownin
theopenposition.
ProgButton/Indicator(Red)
PowerON/OFFButton
/Indicator(Green)
Menu Button
BackButton
AlarmOffButton
/Indicator(Red)
Speaker
DisplayScreen
Status Button
LockButton
Enter Button
Hot Water Temperature
Setting Buttons
The part number
is printed on the
surface of the cover.

13
(Ex.: AM10:15)
Normally the clock display is not shown when
the power ON/OFF button is "OFF".
* This setting can be changed so that the clock is displayed
even when the power button is turned "OFF". ( p.23)
* The screen display shown below is for illustration purposes only.
The actual display will vary depending on how the water heater is being used.
* After a button is pressed, the display will gradually become darker to prevent unnecessary power consumption
by the remote controller.
(Ex.: 110°F)
The flame symbol is displayed during
combustion when using hot water or
recirculation functions.
A number will flash if a
failure occurs. ( p.42)
<Home Screen Example>
ScreenDisplay
What is the home screen?
The home screen is displayed when the button is "ON".
Normally, the hot water temperature and the clock, etc. are displayed.
FlameSymbol
During normal operation, the set
temperature is displayed.
DisplayforRecirculationOperation
DisplayforHighTemperature
Temperature Setting
ClockDisplay
Error Code
* For systems that use recirculation operation, the symbol
is displayed when the power ON/OFF button is set to "ON".
* It is displayed during the recirculation operation. ( p.18)
DisplayforTemperatureSetting
The lock symbol is displayed
when the remote controller is
locked. ( p.22)
LockedDisplay
The clock symbol is displayed
when the recirculation timer is
activated. ( p.29)
Recirculation Timer
Displays when the set temperature
is 125°F/55°C (131°F) or higher.
(p.19)
Note: As shipped from the factory, the remote controller is set to display in °F and gallons.
To adjust the display to °C and liters, refer to the Installation Manual.

14
SystemDisplayedon
the Remote Controller SystemDescription GeneralSystemDiagram
* The number of water heaters, fixtures, and
pumps will vary depending on the configuration of the hot water system.
ApplicableRemote
Controller Functions
Water heater only operation.
Functions other than
those shown on pages
26to29canbeused.
* Water heater and recirculation operation.
* During recirculation operation, hot water is
always circulated in the piping to provide
instant hot water when a fixture is opened.
[If you set the
button to "ON",
is displayed. (If "synchro ON/OFF"
is set to "ON". (
p.26))]
Allfunctions
canbeused.
* Water heater combined with a storage tank
operation.
* If a recirculation system is also installed,
hot water is always circulated in the piping
to provide instant hot water when a fixture
is opened.
[If you set the
button to "ON",
is displayed.]
Functions other than
those shown on pages
26to31canbeused.
Covershownin
theopenposition.
(Display Screen Example [System [Rcrc] ])
Ifyoupressthe button,youcancheckthestatusofthesystem
SystemCheck

15
SystemDisplayedon
the Remote Controller SystemDescription GeneralSystemDiagram
* The number of water heaters, fixtures, and
pumps will vary depending on the configuration of the hot water system.
ApplicableRemote
Controller Functions
Water heater only operation.
Functions other than
those shown on pages
26to29canbeused.
* Water heater and recirculation operation.
* During recirculation operation, hot water is
always circulated in the piping to provide
instant hot water when a fixture is opened.
[If you set the
button to "ON",
is displayed. (If "synchro ON/OFF"
is set to "ON". (
p.26))]
Allfunctions
canbeused.
* Water heater combined with a storage tank
operation.
* If a recirculation system is also installed,
hot water is always circulated in the piping
to provide instant hot water when a fixture
is opened.
[If you set the
button to "ON",
is displayed.]
Functions other than
those shown on pages
26to31canbeused.
Dependingontheconfigurationofyoursystem,notallfunctionsmaybeused.
When you start using the system, cold
water in the piping must be discharged
before receiving hot water.
Water heater
Water heater
Instant hot
water is
available.
Hot water is circulated
in the piping.
Pump
Hot water
storage
tank
Instant hot
water is
available.
Water heater
PumpPump
Hot water is circulated
to the tank.

16
Initial Operation
Before the rst use of your water heater, do the following:
Follow steps 1through4.
1Open the water supply valve.
Open a hot water xture/faucet to
conrm that water is available, and then
close the xture/faucet again.
3Open the gas supply valve.
Hot water
xture/faucet
2
Turn on the power.
CLOSED
4
OPEN
Donottouchwithwethands.
(Ex. NCC300DV (GQ-C5032WZ-FF US))

17
For All Systems
ClockAdjustment
* This adjustment can be made
regardless of whether the
button is ON/OFF.
1
2
(Ex: AM10:15)
Covershownin
theopenposition.
31)
2)
The screen returns to the previous screen.
Press the button
insidethecover.
Press the button.
1)Usethe buttonsto
resettheclock.
2) Press the button
tocompletetheclocksetting.
* The time changes in 1-minute
increments with each press
of the button, and then in
10-minute increments if the
button is kept pressed down.
* If the display is left untouched for
approximately 20 seconds without
pressing the button, the
setting will be completed. When
the button is turned ON,
the home screen will be restored.
* In the event of a power outage or after disconnecting power to the water heater, when power is
restored, the clock on the display screen will show " - : - - " and the clock will need to be reset.
*
Normally, when the button is turned OFF, the clock display disappears, but it is possible to display
the clock when the
button is turned OFF by changing a setting. ( p.23)
Operation ScreenDisplay Description

18
* The indicator is lit.
* The previously set hot water
supply temperature is shown.
[For systems with recirculation operation]
* If you set the button to "ON",
recirculation operation is automatically started.
(If "Synchro ON/OFF" was set to "ON".( p.26))
* The setting temperature displayed
may vary from the actual temperature
at the fixture depending on conditions
such as season or length of piping.
* During operation, the symbol
may be continuously lit.
1
2Turnonhotwater.
Lit during combustion
Check (Ex.: 110°F)
Turnoffhotwater.
Unlit
DANGER
High Temperature
Topreventscalding:
HotWaterHeatertemperaturesover125°F(52°C)cancause
severeburnsinstantlyordeathfromscalding.
For All Systems
Using the Water Heater
* If isdisplayed,hotwater
willbedischarged atthetemperatureofthe
storagetank.
For systems with recirculation operation,
is displayed here.
buttonis"ON".
Turnoffthehotwater
Operation ScreenDisplay Description
• Children, disabled and elderly are at the highest risk of being scalded.
Feel water temperature before bathing or showering.
Temperature limiting valves are available, ask a professional person.
•
When setting the unit to 125°F (55°C in °C mode) or higher, “Hi temp” will ash for 10 seconds and emit a
tone as a high temperature warning.
• Take caution when using the unit again after setting to 125°F (52°C) or higher. Always check the set
temperature before use.
• Do not allow anyone to change the water temperature while hot water is running.

19
Temperature Setting Options
<Displaywhenhightempisset>
Blinksforapproximately10secondsLit.
(Ex.: 125°F)
(°F:)
The temperature settings below are examples. The temperature setting
necessary depends on the usage, the length of piping and the time of year.
*Initial factory setting is 110°F
(°C (°F):)
The temperature settings below are examples. The temperature setting
necessary depends on the usage, the length of piping and the time of year.
*Initial factory setting is 40°C (104°F)
When using °F mode:
When using °C mode:
Shower, hot water supply, etc.
Washing
dishes, etc. High temperature
 37 38 39 40 41 42 43 44 45 46 47 48 50 55 60 65 70 75 80 85
(99)  (100) (102) (104) (106) (108) (109) (111) (113) (115) (117) (118) (122) (131) (140) (149) (158) (167) (176) (185)
 100 105 110 115 120 125 130 135 140 145 150 160 170 185
Shower, hot water supply, etc.
Washing
dishes, etc. High temperature
* The indicator is lit.
* The previously set hot water
supply temperature is shown.
1buttonis"ON".
2Set the temperature using
the
buttonsinside
thecover
.
(Ex.: 110°F)
(Ex.: 105°F)
Covershownin
theopenposition.
* If isdisplayed,hotwater
willbedischargedatthe temperatureof
thestoragetank.
For All Systems
Setting Hot Water Temperature
Operation ScreenDisplay Description
• Hot water temperatures shown are approximate and may differ from the actual temperature at the fixture
depending on external factors such as the season and length of piping in the system.
• When low temperatures are set (for washing dishes, etc.), if the incoming water temperature is already quite
high, it may be difficult to ensure the outgoing water temperature is as per the setting.
• Please check the temperature displayed before using any hot water.
Be especially careful using hot water after the set temperature has been changed.
• When the hot water temperature is adjusted using thermostat controlled water mixing valves, set the
temperature on the remote controller approximately 20°F (10°C) higher than the required temperature to
ensure the appropriate fixture temperature.
If xtures incorporate mixing valves, set the temperature higher than usual.
*
For applications that occasionally require a higher temperature setting, locate the remote controller in a convenient location.
* Consult local codes for minimum operating temperatures.
Note : An error code will be displayed when this water heater detects scale build-up in the heat exchanger.
The error code may be more frequently displayed when the unit is set to a high temperature. (125°F or higher)
Noritz recommends that water temperature is set as low as possible to prevent scale build-up in the heat exchanger.

20
1. Check that the current time is properly set.
(Setting the time p.17)
2. Check the button is set to "OFF"
Cover shown
in the open
position.
This example describes setting the "ON time" and "OFF time" to 10:00 am and 8:00 pm, respectively.
1* You can set the time regardless if
the button is "ON" or "OFF".
* The previously set "Start time"
and "End time" are displayed.
2
3
1) Set the ON time to
"AM10:00" using
the buttons.
2) Press the button
to complete the setting.
1)
2)
1)
2)
1)
2)
Set the time to turn "ON" or "OFF" the button automatically
Operation Screen Display Description
For All Systems
Automatic Water Heater “ON” or “OFF” Operation
* If you set the time to turn "ON" or "OFF" the
button, the button is automatically
turned "ON" or "OFF" at the set time every
day by just turning the button "ON".
* It is also possible to set only “ON” or
“OFF” operation.
* For recirculation systems, circulation is
started or stopped according to the
button condition, "ON" or "OFF".
* The time changes in 10-minute
increments with each press of the
button, and then in 1-hour increments if
the button is kept pressed down.
* If the previous setting is OK, press the
button without setting "Start time".
* If you do not want to set the "Start time",
select "- : --" (located between AM 11:50
and PM 0:00 settings).
* The time changes in 10-minute
increments with each press of the
button, and then in 1-hour increments if
the button is kept pressed down.
* If the previous setting is OK, press the
button without setting "End time".
* If you do not want to set the "End time",
select "- : --" (located between AM 11:50
and PM 0:00 settings).
1) Press the button
inside the cover,
Select "Set PROG"
using the buttons.
2) Press the button.
Preparation
1) Set the OFF time to
"PM8:00" using
the buttons.
2) Press the button
to complete the setting.