Noritz NR71-SV User manual

SBA8654
Rev. 01/11
Models: NR71-SV, NR71-OD* (For USA and Canada)
NR66-SV, NR66-OD* (For USA and Canada)
NR50-OD* (For USA only)
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
*SBA8654*
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.
When applicable, installation must conform with the Manufactured Home Construc-
tion and Safety Standard, Title 24 CFR, Part 3280 or the Canadian Standard CAN/
CSA-Z240 MH Mobile Homes, Series M86.(NR71-OD, NR66-OD only)
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, COMMERCIAL, OR MANUFACTURED HOME APPLICATIONS.

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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)
Prohibited
WARNING
Be sure
to do.
Whenagasleakisnoticed:
1. Stopuseimmediately
2. Closethegasvalve
3. [Wheninstallingindoors]
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
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
(Continued)
Prohibited
[NR71-OD,NR66-OD,NR50-OD]
DoNotInstallIndoors.
This will cause carbon
monoxide poisoning and
a potential re hazard.
Indoor
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.
[NR71-SV,NR66-SV]
Donotusethewaterheaterif
theexhaustpipeisdisplaced,
has holes, is
clogged or
iscorroded.

4
ImportantSafetyInformation-2
(Continued)
air supply
vent
[Wheninstallingindoors
(NR71-SV,NR66-SV)]
Checktheairsupply 
ventfordustor 
obstructions.
Be sure
to do.
Be sure the gas/power
supplied matches the
gasontheratingplate.
Ex.ForNaturalGasNR71-SV
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)
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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.
Exhaust
vent terminal
Outdoor Unit
Prohibited
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.
Do not store or use gasoline or other
ammablevaporsandliquidsinthe
vicinityofthisoranyotherappliance.
Prohibited
Prohibited
Do not place or use a spray can
neartheheaterortheexhaustvent
terminal.
Prohibited
Left side:
Min. 6" Right side:
Min. 6"
Front:
Sug. 24"
Upper: Min. 36"
[Wheninstallingindoors(NR71-SV,NR66-SV)]
[Wheninstallingoutdoors]
180,000 BTU
25,000 BTU 177
4.0
0.55 2.25
10.5
670
15 150
2
NR71-SV
Left side: Min. 2" Right side:
Min. 2"
Upper: Min. 12"
Front: Sug. 24"*
Sug. 3" from
vent pipe
[NR71-SV,NR66-SVonly]
CarbonMonoxidePoisoningHazard.Do
notinstallthiswaterheaterinamobile
home,recreationvehicleoronaboat.
Prohibited
Prohibited
[NR71-OD,NR66-OD,NR50-ODonly]
CarbonMonoxidePoisoningHazard.
Do not install this water heater in a
recreationalvehicleoronaboat.
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 seperate area that is
suppliedwithfreshairfromoutdoors.
Prohibited
WARNING
Exhaust vent terminal
(indoor installation)
Unit

5
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
(Continued)
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,
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.
Do not allow small children to play
unsupervisedinthebathroom.
Donotallowsmallchildrentobathe
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
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.
Topreventburnsorscalding,turn off
thepowerbuttonorpowersupply and
waituntiltheequipmentcoolsbefore
performing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.

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.
Preventingdamagefromfreezing( p.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.
Thisunitisonlyapprovedforinstallation
upto4500ft.(2000ft.forNR50-OD)above
sealevel.
For installations at higher elevations, contact Noritz
America for Instructions.
Checkignitionduringuseandextinction
afteruse.
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.
Takenecessarymeasurestoprevent
freezingofwaterandleakageofgaswhen
leavingtheunitunusedforlongperiodsof
time.( p.19)
Donotusepartsotherthanthosespecied
forthisequipment.
Ifitissnowing,checktheairinlet,exhaust
gasventand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.
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.

7
 ImportantSafetyInformation....................................................................... 2
Contents......................................................................................................... 7
General Parts
Main Unit.................................................................................................... 8
Remote Controller..................................................................................... 9
Initial Operation............................................................................................ 10
How to Use (Not using the remote controller)
Setting and Using the Water Heater........................................................ 11
How to Use (Using the remote controller)
Setting and Using the Water Heater........................................................ 12
Flow Meter Alarm...................................................................................... 14
Muting the Remote Controller.................................................................. 16
 AdjustingtheMaximumOutputTemperature........................................ 17
 PreventingDamagefromFreezing............................................................. 18
Regular Maintenance................................................................................... 20
 Troubleshooting........................................................................................... 22
 Follow-upService........................................................................................ 27
 Specications............................................................................................... 29
Contents

8
NR71-SV, NR66-SV
Indoor/Outdoor Wall Mounted, Power Vented Model
* Theaboveillustrationshowsanexampleofinstallation.
The exact installation conguration may be slightly different.
Main Unit
Flue Collar
FrontCover
Air Inlet
WaterSupplyValve
GasSupplyValve
WaterDrainValve(withWaterFilter)
(Inside Water Inlet) (p.21)
PressureReliefValve
General Parts
NR71-OD, NR66-OD, NR50-OD
Outdoor Wall Mounted, Power Vented Model
ExhaustVent
FrontCover
Air Inlet
WaterSupplyValve
GasSupplyValve
WaterDrainValve(withWaterFilter)
(Inside Water Inlet) (p.21)
PressureReliefValve
(Ex. NR71-SV)
(Ex. NR71-OD)

9
RemoteController(RC-7649M)<Optional>
For setting the hot
water temperature,
the ow meter alarm,
and other settings.
PowerOn/OffButton
For turning the
heater on and off.
Flow Meter Alarm Set Button
For setting the ow
meter alarm.
(p.14-15)
Setting Buttons
* Before use, remove the protective sheet from the remote controller surface.
Temperature Setting
(Ex.: 110°F)
Flow Meter Setting
The display will ash
after hitting the ow
meter alarm set button.
(p.15)
Error Code
When this indicator is lit,
the hot water temperature
can be set. (p.12)
Theillustrationbelowshowstheremotecontrollerdisplay.Whatisactuallydisplayed
dependsonhowthewaterheaterisset.
A number will ash if
a failure occurs.
(p.26)
Priority Indicator
Burner On Indicator
When burning, the
indicator is lit.
( p.13and15)

10
(Ex. NR71-SV)
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.

11
3
Mixfordesiredtemperature.
The factory temperature setting is 120°F (xed). Mix with cold water with a mixing valve
or at the xture for desired temperature.
Topreventscalding.
1Checkthatelectricalpowerisconnected.
2
4
How to Use (Not using the remote controller)
Setting and Using the Water Heater
If you want to the temperature to be changed to 130°F or 140°F, contact the installer or Noritz.
Turnonhotwater.
Turnoffthehotwater.
DANGER
High Temperature
The electrical power does not need to
be disconnected between uses.
Hot water
Water
HotWaterHeatertemperaturesover125°F 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.

12
Remote Controller Display
Press the Power
On/OffButton.
How to Use (Using the remote controller)
Setting and Using the Water Heater
Previous set
temperature
(Ex.: 110°F)
The temperature will be
displayed on the remote
control thermostat.
1
2(Starting with the Power Off)
On
On
High Temperature
Topreventscalding:
Flashes for 10 sec
1
DANGER
HotWaterHeatertemperaturesover125°F 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 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
or higher. Always check the set temperature before use.
• Do not allow anyone to change the water temperature while
hot water is running.

13
43 Turn on hot
water.
2
Settemperature.
Turnoffthehot
water.
Alwayscheckthe
temperature setting
beforeuse.
Hot
Cold
Check the indicator lights.
Water temperature
On Off
(°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.
* For most residential applications, the recommended setting temperature is 120°F or less.
For applications that occasionally require a higher temperature setting, locate the remote
controller in a convenient location.
* Consult local codes for minimum operating temperatures.
Shower, hot water supply,
etc.
Washing
dishes, etc.
High temperature
Contact the installer or Noritz
America when setting the
maximum output temperature
in this range.
The maximum output tempera-
ture can be set using the re-
mote controller. ( p.17)
100 105 110 115 120 125 130 135 140 145 150 160
( )

14
How to Use (Using the remote controller)
Flow Meter Alarm
3
2,3
1
2
Set temperature.
Press the Power
On/Off Button
Plug the bath drain.
Preparation
(Starting with the power off)
Always check
temperature setting
before use.
Hot
Cold
On
The temperature will be displayed
on the remote control thermostat.
Previous set temperature
(example:110°F)
On Check the indicator lights.
Water temperature
1
( )

15
100 105 110 115 120
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. * Initial factory setting: 110°F
Water Temperature
The temperatures settings below are only examples. The
temperature setting necessary will depend on the usage,
the length of piping and the time of year.
(°F: )
Warmer HotWarm
5Turn off the hot
water when the
alarm sounds.
4Turn on hot
water.
3Adjust ow meter
alarm setting.
To set the ow meter alarm:
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 (In
5 gallon intervals), 70 - 100 (In 10
gallon intervals), or 990 gallons.
The alarm will not sound if
it is set for 990 gal.
The alarm will not
sound if it is set for
990 gal.
On
Flow meter setting will be ashing
(ex. 45 gal.)
* The level can only be adjusted
while the indicator is ashing.
* After ten seconds, the remote
will again display the temperature.
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.
• If there was water in the tub before the ll began, the temperature in the tub after it is full may
be different from the temperature setting.
The alarm will sound when
the set level has been
reached. Stop the water.
Note:
Note:

16
The remote controller will emit a sound
when any button is pushed. This sound
can be muted if it is desired.
1
How to Use (Using the remote controller)
Muting the Remote Controller
* Initial factory setting is with sound
Sound
Muted
No sound
after 5 sec.
1Hold the Power On/Off Button
for ve seconds.
Tone sounds
after 5 sec.
• The ow meter alarm cannot be muted.
• The high temperature warning tone when setting the unit to 125°F or higher will not emit a sound
when muted.

17
How to Use (Using the remote controller)
Adjusting the Maximum Output Temperature
2
3
1
3
Change the
temperature using
the setting buttons.
Press and hold the ow
meter alarm set button until
a sound is heard (2 sec.).
Up
Down
The upper limit of the hot-water
supply temperature can be
changed to 100°F, 105°F, 110°F,
115°F, 120°F, 125°F, 130°F, 135
°F or 140°F.
2
Turn off the
power.
Off
1
Set the Power button to ON when continuing to use
the unit as is. Otherwise, let the unit sit for 30 sec.
4
Tone sounds
after 2 sec.

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.)
* 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
[For Model Series NR66 and NR71 only]
Freezing is prevented within the device automatically by the freeze-prevention heate
(Model NR50-OD does not include this feature)
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 equipment 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 -30°F (indoor installation) or -4°F (outdoor installation).
* 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.
Take the measures below for extremely cold temperatures*. For model NR50-OD, this procedure
must be done to prevent freezing. <Only using the remote controller>
(outside temperature including wind chill factor less than -30°F (indoor installation) or
-4°F (outdoor installation)).
This method can protect not only the heater, but also the water supply,
water piping and mixing valves.
1. Turn off the power.
2. Close the gas supply valve.
3. Open a hot water xture, and keep a small stream of hot water running.
(0.1 gal/minute or about 0.2" 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 ( p. 6), but in this case freeze prevention is more important.
0.2" thick
Hot Water Fixture

19
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 ther power button.
3. <Not using the remote controller>
Turn off the power supply after 20 seconds 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. Turn the drain plug to the left to open, and then 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.
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 equipment cools down before draining the water.
The appliance will remain hot after it is turned off.
High Temperature
Drain water into a bucket to prevent water damage.
Do not touch with wet hands.
Fixture
Fixture
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 p.10 “Initial operation”, steps 1 through 4.
CAUTION
Do not touch with wet hands.
Drain Plugs
Each drain plug mignt not be
visible if insulation is installed
around the piping.

20
(Ex. NR71-SV)
Periodic Maintenance
Wipe the outside surface with a wet cloth, then dry the surface. Use a neutral detergent to
clean any stains.
• Do not use benzene, oil or fatty detergents to clean the remote controller;
deformation may occur.
• The remote controller is water resistant but not water proof. Keep it as dry as possible.
Regular Maintenance
Periodic Inspection
Check
For laundry, newspaper, timber,
oil, spray cans and other
combustible materials.
Equipment
Remote Controller
Wipe the surface with a wet cloth.
For abnormal sounds
during operation.
For abnormalities in
external appearance,
discoloration or aws.
For water leaks from the
equipment and piping.
For dust or debris in
the air inlet.
For dust and soot in
the exhaust vent or
exhaust vent terminal.
For proper operation of
pressure relief valve.
Check
Check
Check
Check
Check
Check
CAUTION
To prevent burns or scalding, turn off the power button or power supply and
wait until the equipment cools before performing maintenance.
Be sure to do.