Noritz NC1991-OD-NG User manual

SBA8883-1
Rev. 03/13
Models : NC1991-OD
NC1991-DVC
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 COMMERCIAL APPLICATIONS.
CERTIFIED
R
*SBA8883*
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
(Continued)
No ame.
(Continued)
WARNING
Be sure
to do.
Whenagasleakisnoticed:
1. Stopuseimmediately.
2. Closethegasvalve.
[NC1991-DVC]
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.
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
Prohibited
[NC1991-OD]
DoNotInstallIndoors.
This will cause carbon
monoxide poisoning and
a potential re hazard. Indoor
Prohibited
[NC1991-DVC]
Do not use the
waterheaterifthe
concentric pipe is
displaced,hasholes,
is clogged or is
corroded.

4
ImportantSafetyInformation-2
(Continued)
Donotplacetheunitortheue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.
(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.
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.
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ue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.
Prohibited
Prohibited
Prohibited
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ueterminal.
Prohibited
Donotusecombustiblechemicals
suchasoil,gasoline,benzeneetc.in
theneartheheaterortheueterminal.
Prohibited
CarbonMonoxidePoisoningHazard.Do
notinstallthiswaterheaterinamobile
home,recreationalvehicleoronaboat.
Prohibited
WARNING
Unit
Left side:
Min. 6" (150mm)
Right side:
Min. 6" (150mm)
Upper:
Min. 36" (900mm)
Front:
Sug. 24" (600mm)*
Unit
Ex.ForNaturalGas(NC1991-OD)
[NC1991-DVC]
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
Left side:
Min. 2" (50mm) Right side:
Min. 2" (50mm)
Front:
Sug. 24" (600mm)*
Sug. 3" (75mm)
from concentric
pipe*
Upper: Min.
12" (300mm)
[NC1991-OD]
[NC1991-DVC]
Flue terminal
Flue terminal

5
(Continued)
Do not touch the power
cordwithwethands.
Electric
Shock.
Don’t touch
with a wet
hand.
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
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ue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or
theueterminalandconcentric
pipe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per-
formingmaintenance.
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.
[NC1991-OD] [NC1991-DVC]

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. 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airinlet,exhaust
ventandue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 or valves, discharge
water setting the handle completely
to the water side.

7
 ImportantSafetyInformation....................................................................... 2
Contents......................................................................................................... 7
 RC-9018MOperationOverview.................................................................... 8
Initial Operation............................................................................................ 10
General Parts
Main Unit................................................................................................... 11
Remote Controller.................................................................................... 12
 SystemCheck............................................................................................... 14
 ForAllSystems
 ClockAdjustment...................................................................................... 16
Using the Water Heater............................................................................. 17
Setting Hot Water Temperature................................................................ 18
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........................................................................................... 37
 Follow-upService........................................................................................ 42
 Specications............................................................................................... 45
 DefaultSettings............................................................................................ 47
Contents

8
RC-9018MOperationOverview
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")

9
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

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
Turn on the power.
CLOSED
4
OPEN
Donottouchwithwethands.
(Ex. NC1991-OD)

11
General Parts -1
Main Unit
* Theaboveillustrationshowsanexampleofinstallation.
The exact installation conguration may be slightly different.
NC1991-OD
(OutdoorWallMounted,PowerVentedModel)
Air Inlet
WaterSupplyValve
GasSupplyValve
PressureReliefValve
ExhaustVent
FrontCover
WaterDrainValve
(withWaterFilter)
(Inside Water Inlet)
(p.36)
NC1991-DVC
(IndoorWallMounted,PowerVent/SealedModel)
FrontCover
WaterSupplyValve
GasSupplyValve
WaterDrainValve
(withWaterFilter)
(Inside Water Inlet)
(p.36)
PressureReliefValve
Concentric Pipe

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.18),
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.41)
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.41)
<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
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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.
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
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

17
* 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 (131°F) 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.

18
* 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

19
Temperature Setting Options
• 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.
<Displaywhenhightempisset>
(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
If xtures incorporate mixing valves, set the temperature higher than usual.
 100 105 110 115 120 125 130 135 140 145 150 160 170 185
Shower, hot water supply, etc.
Washing
dishes, etc.
(°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)
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)
When using °F mode:
When using °C mode:
* For applications that occasionally require a higher temperature setting,
locate the remote controller in a convenient location.
* Consult local codes for minimum operating temperatures.
High temperature
Blinksforapproximately10secondsLit.

20
1. Check that the current time is properly set.
(Setting the time p.16)
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.