Noritz NRC663-FSV User manual

SBB809K
Rev. 08/14
Model : NRC663-FSV (EZTR40)
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
Thank you for purchasing this Noritz Tankless Gas Water Heater.
Before using, please:
Read this manual completely for operation instructions.
Completely ll out the warranty registration card (included separately) and
mail the detachable portion to Noritz America Corporation.
Keep this manual (and the remainder of 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.
Noritz America reserves the right to discontinue, or change at any time, the
designs and/or specications of its products without notice.
FOR USE IN RESIDENTIAL APPLICATIONS.
Low NOx Approved
by SCAQMD
14 ng/J or 20 ppm
(Natural Gas Only)
*SBB809K*
SBB809KT_001_015_E_J.indd 1 2014/08/01 16:33:13

2
Prohibited Don’t
touch.
Don’t
disassemble
the unit.
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
SBB809KT_001_015_E_J.indd 2 2014/08/01 16:33:15

3
No ame.
WARNING
Be sure
to do.
Whenagasleakisnoticed:
1. Stopuseimmediately
2. Closethegasvalve
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 result
in fire or explosion, and personal injury or
death.
Prohibited
Do not use the
waterheaterif
the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 fill the condensate trap
couldresultinseverepersonalinjury
ordeath.
(Refertopage20forfurtherinstructions.)
Be sure
to do.
Be sure
to do.
Checkwhetherornottheair
inletlteriscloggedwith
dust,trashorthelike.
Clogging the opening may
result in incomplete combustion.
Air inlet filter
SBB809KT_001_015_E_J.indd 3 2014/08/01 16:33:15

4
Donotplacetheexhaustventterminal
inanindoorenvironmentbymeansof
adding walls and ceiling (Do not enclose
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
Conrmthatthegasand
powersupplyindicated
ontheratingplate.
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allowsmallchildrentoplay
unsupervisedinthebathroom.
Donotallowsmallchildrentobathunsupervised.
Donotusehairsprayorspray
detergentinthevicinityofthe
heater.
Do not touch the power cord
withwethands.
Prohibited
Electric
Shock.
Don’t touch
with a wet
hand.
Prohibited
ConsultthenearestNoritzagentif
the water heater location needs to
bechanged.
Be sure
to do.
Prohibited
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mobile
home,recreationalvehicleoronaboat.
Prohibited
WARNING
Left side:
Min. 3" (75mm)
More 8" (200mm)** Right side:
Min. 3" (75mm)
Front:
Sug. 24" (600mm)*
Sug. 3" (75mm)
from vent pipe*
Upper:
Min. 12" (300mm)
Be sure
to do.
Checktheairsupplyopening
fordustorobstructions.
Clogged
air supply
opening!!
** In order to check a rating plate.
Ex.ForNaturalGas
SBB809KT_001_015_E_J.indd 4 2014/08/01 16:33:17

5
(Continued)
ContactNoritzbeforeusingwith
asolarpre-heater.
Contactaqualiedservice
technicianforanynecessary
repairs,serviceormaintenance.
Don’t
disassemble
the unit.
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.
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.
CAUTION
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unitcools
beforeperformingmaintenance.
Donotusecondensate,discharged
fromthedrainpipe,fordrinkingor
forconsumptionbyanimals.
Prohibited
SBB809KT_001_015_E_J.indd 5 2014/08/01 16:33:18

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unit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3,500ft.(1,050m)abovesealevel.
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.(Page23)
Preventingdamagefromfreezing(Page18)
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.(Page 19)
Donotusepartsotherthanthosespeciedfor
thisunit.
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.
Although it is water resistant, too much 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 or valves, discharge water
setting the handle completely to the water side.
Forpreventingunexpectedcarbonmonoxide
poisoning,itisrecommendedtoattachaCO
Sensor(commercially-availableproduct).(The
waterheaterdoesnotstopautomatically.)
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7
 ImportantSafetyInformation....................................................................... 2
Contents......................................................................................................... 7
Unit Components.......................................................................................... 8
 DisplayWindow............................................................................................. 9
Initial Operation............................................................................................ 10
How to Use (Not using the remote controller)
Using the Water Heater............................................................................. 11
How to Use (Using the optional remote controller)
Remote Controller..................................................................................... 12
Setting and Using the Water Heater........................................................ 13
Muting the Remote Controller.................................................................. 15
 AdjustingtheMaximumOutputTemperature........................................ 15
Flow Meter Alarm...................................................................................... 16
 PreventingDamagefromFreezing............................................................. 18
Regular Maintenance................................................................................... 21
 Troubleshooting........................................................................................... 24
 Follow-upService........................................................................................ 30
 Specications............................................................................................... 32
Contents
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8
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. 0.8 gallons/hour (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.
Condensate comes
out from here.
IndoorWallMounted,PowerVentedModel
* Theaboveillustrationshowsanexampleofinstallation.
The exact installation conguration may be slightly different.
Unit
FrontCover
Unit Components
Drain Pipe
Discharges the
condensate.
GasSupplyValve
Displayed during
power "ON" or
combustion. (Page9)
Two or three digit-
number is displayed
when a failure occurs.
(Page 24)
DisplayWindow
The condensing
tanklessgaswater
heater tends to show
whitesteam.
After the exhaust gas passes
through the secondary heat
exchanger, it becomes low in
temperature and moisture rich
which tends to produce steam
at the vent discharge terminal.
This is a normal occurrence.
Air Inlet Filter During combustion, white
steam may often be seen.
This is normal.
WaterSupplyValve
PressureReliefValve
WaterDrainValve
(with Water Filter)
(Inside Water Inlet)
(Page 22)
Flue Collar
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9
The display window allows you to view the status
of unit or error codes.
DisplayWindow
When other indication will appear, please refer to troubleshooting. (page 24)
(Display Window)
Whenthegasburnerison.
Whenthegasburnerison,set
temperature's is
displayedforoneminute.
Whenhotwaterows.
Ifthereisaproblemwiththeunit,anumerical
errorcodewillash.(page 24)
When unit is initially plugged into power,
set temperature's is displayed for approx. three minutes.
(When the gas burner is off, and cold water ows.)
After one minute passed from turn on hot water, the outside edge of
the three digit display will rotate in a circular pattern.
On
(Ex.: error cord 11)
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10
Initial Operation
Before the rst use of your water heater, make the following preparations.
Follow steps 1through4.
1Open the water supply valve.
Open a hot water xture to conrm that
water is available, and then close the
xture again.
3Open the gas supply valve.
Hot water xture
2
Plug into power.
CLOSED
4
OPEN
Donottouchwithwethands.
Please check the following when you use the water heater for the rst time after the installation.
Usually, the hot water is supplied by opening the hot water if gas, water, and electric power are
supplied (if there is a remote controller, it should be turned ON).
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11
Checkthatelectrical
powerisconnected.
Turnonhotwater.
Mixfordesired
temperature.
Turnoffthehot
water.
The factory temperature setting is 120°F. Mix with
cold water with a mixing valve or at the xture for
desired temperature.
Topreventscalding.
How to Use (Not using the remote controller)
Using the Water Heater
If you want to the temperature to be changed to 130°F, 135°F or 140°F, contact the installer or Noritz.
DANGER
High Temperature
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.
(Display Window)
(Display Window)
Set temperature is displayed.
* When unit is initially plugged
into power.
Hot water
Indicates the burner is on. The outside edge of
the 3 digit display will rotate in a circular pattern.
Hot water
Cold water
STOP
Indicates the burner is off.
The electrical power does not need to
be disconnected between uses.
* How to check the set temperature.
If the power supply is set to "OFF",
and then set to "ON", the temperature
of supplied hot water is displayed.
Indicates the burner is on
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12
How to Use (Using the optional remote controller)
Remote Controller
OptionalRemoteController(RC-7651M)
For setting the hot
water temperature,
the ow meter alarm,
and other settings.
PowerOn/OffButton
For turning electrical
power to the unit on
and off.
Flow Meter Alarm Set Button
For setting the ow
meter alarm.
(pages16-17)
Setting Buttons
* Before use, remove the protective sheet from the remote controller surface.
Temperature Setting
(Ex.:115°F)
Flow Meter Setting
The display will ash
after hitting the ow
meter alarm set button.
(page16)
Error Code
When this indicator is lit,
the hot water temperature
can be set. (page13)
Ifyouwanttochangethetemperatureofsuppliedhotwaterfrequentlyoryouwanttoset
theamountofhotwatertoaccumulatethehotwater,thisremotecontrollerisuseful.
A number will ash if
a failure occurs.
(page 24)
PriorityIndicator
Burner On Indicator
When burning, the
indicator is lit.
(pages13and16)
Note: Initial factory setting is set to display in °F and gallons.
To adjust the display to °C and liters, refer to the Installation Manual.
Whatisactuallydisplayeddependsonhowthewaterheaterisset.
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13
Press the Power On/
OffButton.
The temperature will be
displayed on the remote
control thermostat.
Settemperature.
(
Alwayscheckthetemperature
settingbeforeuse.)
Turnonhotwater.
Turnoffthehot
water.
How to Use (Using the optional remote controller)
Setting and Using the Water Heater
Hot
Cold
On
Previous set temperature
(Ex.: 115°F)
On
If xtures incorporate mixing valves, set the temperature higher than usual.
*
For most residential applications, the recommended setting temperature is 120°F / 50°C (122°F) or less.
* Consult local codes for minimum operating temperatures.
(°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 46°C (115°F)
Shower, hot water supply, etc. High temperature
 46 47 48 50 55 60
 (115) (117) (118) (122) (131) (140)
The maximum output temperature
can be set using the remote
controller. (page 15)
When using °F mode:
When using °C mode:
Check the indicator lights.
Water temperature
On
Off
*Initial factory setting is 115°F
 115 120 125 130 135 140
Shower, hot water supply, etc. High temperature
The maximum output temperature can be set using the remote controller. (page 15)
(°F:)
The temperature settings below are examples. The temperature setting
necessary depends on the usage, the length of piping and the time of year.
STOP
Hot water
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14
RemotecontrollerDisplay
High Temperature
Topreventscalding:
Flashes for 10 sec
DANGER
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.
• When setting the unit to 125°F / 55°C (131°F) or higher, the
temperature display 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.
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15
How to Use (Using the optional remote controller)
AdjustingtheMaximumOutputTemperature
The remote controller will emit a sound when any button is pushed. This sound can be muted if it is desired.
How to Use (Using the optional remote controller)
Muting the Remote Controller
* Initial factory setting is with sound
• The ow meter alarm cannot be muted.
• The high temperature warning tone when setting the unit to 125°F / 55°C (131°F) or higher will
not emit a sound when muted.
Hold the Power On/
OffButtonforve
seconds.
Sound
Muted
No sound
after 5 sec.
Tone sounds
after 5 sec.
TurnoffthePower
On/OffButton.
Pressandholdtheow
meteralarmsetbutton
until a sound is heard
(2sec.).
Change the temperature
using the setting
buttons.
SetthePowerbuttontoONwhen
continuingtousetheunitasis.
Otherwise,lettheunitsitfor30sec.
Off
Tone sounds
after 2 sec.
The upper limit of the hot-water supply
temperature can be changed to
(For Fahrenheit (°F))
115°F, 120°F, 125°F, 130°F, 135°F or 140°F.
(For Celsius (°C))
46°C, 47°C, 48°C, 50°C, 55°C or 60°C.
Up
Down
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16
How to Use (Using the optional remote controller)
Flow Meter Alarm
Plug the bath drain.
(Starting with the power off)
Press the Power
On/Off Button.
Set temperature.
(Always check the temperature
setting before use. )
Adjust ow meter alarm setting.
Turn on hot water.
Turn off the hot water when the
alarm sounds.
Check the indicator lights.
Water temperature
Previous set temperature
(example:115°F)
On
The temperature will be
displayed on the remote
control thermostat.
When the display
setting is in Celsius.
When the display
setting is in Fahrenheit.
On On
Previous set temperature
(example:46°C)
Hot
Cold
Check the indicator lights.
Water temperature
Press the ow meter alarm set button (the setting will
ash on the display) and adjust with the setting buttons.
Increase
Decrease
Choose the ow meter alarm setting from the following options:
10 - 60 gallon (40 - 240L) (In 5 gallon (20L) intervals), 70 gallon (260L),
80 gallon (300L), 90 gallon (340L), 100 gallon (380L) , 990 gallon.
Note:
The alarm will not sound if it is set for 990 gallon.
Flow meter setting
will be ashing
(ex. 45 gallon)
* The level can only be adjusted
while the indicator is ashing.
* After ten seconds, the remote
will again display the temperature.
Flow meter setting
will be ashing
(ex. 180L)
The a alarm will sound when the set level
has been reached. Stop the water.
On
Off
On
Off
Preparation
To set the ow meter alarm:
Mix water to control the temperature of hot
water as occasion demands.
If water is mixed, ll larger quantity of hot
water than the quantity of water you set.
Note:
The alarm will not sound if it is set for 990 gallon.
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17
An alarm will sound for ten
seconds when the ow
reaches the set level.
The water will continue to run unless it is
manually turned off.
If the ow meter alarm is being used to indicate when a tub is full:
• If any hot water is being used besides what is going into the tub, the alarm will sound
before the tub is full.
• If there was water in the tub before the ll began, or if the water is not shut off manually
when the alarm sounds, the tub may overow.
Check the temperature
before stepping into
the bath tub.
High
Temperature.
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18
* 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.
Freezing cannot be prevented when the power plug is unplugged. Do not remove the power
plug from the wall outlet.
Freezing will be prevented regardless of whether the operation switch is ON or OFF.
Take the measures below for extremely cold temperatures*. <Only using the remote controller>
Outside temperature including wind chill factor less than 32°F (0°C) .
- The room temperature must be greater than 32°F (0°C) to prevent freezing and the room inside
must not have negative pressure.
This method can protect not only the heater, but also the water supply, water piping and mixing valves.
1. Turn off the Power On/Off Button.
2. Close the gas supply valve.
3. Open a hot water xture, and keep a small stream of hot water
running. (0.1 gallon (400cc)/minute or about 0.2" (4mm) thick.)
* If there is a mixing valve, set it to the highest level.
4. The ow may become unstable from time to time.
Check the ow 30 minutes later.
* In general, it is not advisable to run water through the unit when
it is OFF (page 6), but in this case freeze prevention is more important.
* Remember to set mixing valves and xtures to their original levels before using the unit again
to prevent scalding.
* If there is still a risk that the unit will freeze, drain the unit as shown on the next page.
Preventing Damage from Freezing-1
Freezing is prevented within the device automatically by the freeze-prevention heater.
If water will not ow because it is frozen
1. Close the gas and water valves.
2. Turn off the power button.
3. Open the water supply valve from time to time to check whether water is running.
4. When the water is owing again, check for water leaks from the unit and piping before using.
If the heater or the piping is frozen, do not use the heater or it may get damaged.
CAUTION
* In normal operation, freezing is prevented within the device automatically unless the outside
temperature without wind is below 32°F (0°C).
- The room temperature must be greater than 32°F (0°C) to prevent freezing and the room
inside must not have negative pressure.
* The freeze prevention heaters will not prevent the plumbing external to the unit from freezing.
Protect this plumbing with insulation, heat tape or electric heaters, solenoids, or pipe covers.
If there remains a freezing risk, contact the nearest Noritz agent.
0.2" (4mm)
thick
Hot Water Fixture
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19
If the water heater will not be used for a long period of time,
drain the water.
Drain the water as follows:
To avoid burns, wait until the unit cools down before draining the water.
The appliance will remain hot after it is turned off.
High Temperature
CAUTION
1. Close the gas valve.
2. <Not using the remote controller>
Fully open one of the hot water xtures.
<Using the remote controller>
Turn off the power button.
3. <Not using the remote controller>
Turn off the power supply after 2 minutes or more pass from operation of 2.
<Using the remote controller>
Turn off the power supply.
4. Close the water supply valve.
5. Fully open all hot water xtures.
6. 1) Turn the drain plug (1), (2) to the left to open, and then remove.
2) Turn the drain plug (3) to the left to open (Not necessary to remove).
3) Wait approximately 30 seconds.
4) Turn the drain plug (4) to the left to open (Not necessary to remove).
7. Check that the water is completely drained, close all the drain plugs and the hot water
xtures after 10 minutes or more pass from operation of 6.
Drain water into a bucket to prevent water damage.
Do not touch with wet hands.
Fixture
Fixture
Do not touch with wet hands.
Drain plug (1)
Drain plug (4)
Drain plug (2) Each drain plug might not be visible if
insulation is installed around the piping.
Drain Plugs
Drain plug (3)
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20
Turning the Unit Back On
1. Check that all drain plugs are inserted.
2. Check that all hot water xtures are closed.
3. Follow the procedure on page 10 “Initial operation”, steps 1 through 4.
4. Make sure that the area around the appliance is well ventilated; open a window or a door if necessary.
Then, operate the unit and verify that condensate is coming out of the drain pipe.
(During normal use of the water heater, condensate will begin to discharge from the drain pipe within 15
minutes of use. However, depending on the season and/or installation site conditions, it may take longer.)
* If water does not appear at the end of the drain line, a qualied service technician must clean the
condensate line.
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.
(By performing step 4 as described above, the condensate trap will automatically
ll itself with water.)
Be sure to do.
DANGER
Preventing Damage from Freezing-2
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