Noritz GQ-2457WS US User manual

SBB80YQ
Rev.08/17
Models : NR83DVC (GQ-2457WS-FFA US)
NR83OD (GQ-2457WS US)
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 RESIDENTIAL OR MANUFACTURED HOME APPLICATIONS.
*SBB80YQ*
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 - 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
3. [NR83DVC]
 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)
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
[NR83OD]
DoNotInstallIndoors.
This will cause carbon
monoxide poisoning and
a potential re hazard. Indoor
Prohibited
[NR83DVC]
Do not use the water
heateriftheconcentric
pipeisdisplaced,has
holes,iscloggedoris
corroded.

4
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.
ImportantSafetyInformation-2
(Continued)
Ifthisunitwillbeinstalledina
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
(NR83DVC (GQ-2457WS-FFA 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ueterminal.
Donotusehairsprayorspray
detergentinthevicinityofthe
heater.
Prohibited
Prohibited
[NR83DVC]
Do not place outdoors
Rain may enter the unit or the
burner re may be blown by the
wind, causing malfunction
or
re as a result.
Prohibited
Outdoor
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
Prohibited
WARNING
CarbonMonoxidePoisoningHazard.
Do not install this water heater in a
recreationalvehicleoronaboat.
Unit
Flue terminal
Unit
Flue terminal
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.
Left side:
Min. 6" (150mm)
Right side:
Min. 6" (150mm)
Upper:
Min. 36" (900mm)
Front:
Sug. 24" (600mm)*
Left side:
Min. 2" (50mm) Right side:
Min. 2" (50mm)
Front:
Sug. 24" (600mm)*
Sug. 3" (75mm)
from vent pipe*
Upper: Min.
12" (300mm)
[NR83OD]
[NR83DVC]

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
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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
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.
[NR83OD] [NR83DVC]

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.( p.20andp.21)
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.
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.
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.21) 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.
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,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.
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.

7
 ImportantSafetyInformation....................................................................... 2
Contents......................................................................................................... 7
General Parts
Main Unit.................................................................................................... 8
Remote Controller.................................................................................... 10
Initial Operation............................................................................................ 11
How to Use
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........................................................................................ 26
 Specications............................................................................................... 28
Contents

8
NR83DVC (GQ-2457WS-FFA 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.
Main Unit
FrontCover
WaterSupplyValve
GasSupplyValve
WaterDrainValve
(with Water Filter)
(Inside Water Inlet)
(p.20)
In this Owner’s Guide, this
panle will be referred to as
the “Remote Controller”.
PressureReliefValve
GeneralParts-1
Operation Panel
Concentric Pipe

9
Main Unit
NR83OD (GQ-2457WS US)
(OutdoorWallMounted,PowerVentedModel)
Air Inlet
GasSupplyValve
PressureReliefValve
ExhaustVent
FrontCover
WaterDrainValve
(with Water Filter)
(Inside Water Inlet)
(p.20)
WaterSupplyValve
* Theaboveillustrationshowsanexampleofinstallation.
The exact installation conguration may be slightly different.

10
RemoteController(RC-7651M)
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.:115°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)
Whatisactuallydisplayeddependsonhowthewaterheaterisset.
A number will ash if
a failure occurs.
(p.25)
PriorityIndicator
Burner On Indicator
When burning, the
indicator is lit.
( p.13and15)
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.
General Parts-2

11
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 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. NR83DVC (GQ-2457WS-FFA US))

12
RemoteControllerDisplay
Press the Power
On/OffButton.
How to Use
Setting and Using the Water Heater
Previous set
temperature
(Ex.: 120°F)
The temperature will be
displayed on the Remote
Controller.
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(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 in °C mode) 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.

13
4
3Turn 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
( )
If xtures incorporate mixing valves, set the temperature higher than usual.
*
For most residential applications, the recommended setting temperature is 120°F (50°C in °C mode) 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 16)
When using °F mode:
When using °C mode:
*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 16)
(°F:)
The temperature settings below are examples. The temperature setting
necessary depends on the usage, the length of piping and the time of year.
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.

14
How to Use
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 Controller.
Previous set temperature (example:115°F)
On Check the indicator lights.
Water temperature
1
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.
On Check the indicator lights.
Water temperature
Previous set temperature (example:46°C)
When the display setting is in Celsius.
When the display
setting is in Fahrenheit.
( )

15
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.
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 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.
Note: The alarm will not sound
if it is set for 990 gallon.
On
Flow meter setting will be ashing
(ex. 45 gallon)
Off
The alarm will sound when
the set level has been
reached. Stop the water.
* The level can only be adjusted
while the indicator is ashing.
* After ten seconds, the remote
will again display the temperature.
On
Flow meter setting will be ashing (ex. 180L)
Off
* Initial factory setting: 115°F or 46°C (115°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.
(°C (°F) : )
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 : )
 115 120
Hot
Hot
 46 47 48
 (115) (117) (118)

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
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 (55°C in °C mode) or higher
will not emit a sound when muted.

17
How to Use
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
(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.
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.)
Takethemeasuresbelowforextremelycoldtemperatures*.
Outside temperature including wind chill factor less than -30°F (-35°C) for NR83DVC (GQ-2457WS
-FFA US) or -4°F (-20°C) for NR83OD (GQ-2457WS US).
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 gallon (400cc)/minute or about 0.2" (4mm) thick.)
* If there is a mixing valve, set it to the highest level.
* When linking multiple units, discharge water equivalent to
(0.1 gallon (400cc)/minute per unit.
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.
* 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.
0.2" (4mm)
thick
Hot Water Fixture
PreventingDamagefromFreezing
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 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 (-35°C) for NR83DVC (GQ-2457WS-FFA US) or
-4°F (-20°C) for NR83OD (GQ-2457WS US).
* 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.

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 equipment cools down before draining the water.
The appliance will remain hot after it is turned off.
High Temperature
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.11 “Initial operation”, steps 1 through 4.
CAUTION
1. Close the gas valve.
2. Turn off ther power button.
3. 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.
Drain water into a bucket to prevent water damage.
Fixture
Donottouchwithwethands.
Drain Plugs
Each drain plug mignt not be visible
if insulation is installed around the
piping.
To prevent damage from freezing, the water heater must be plugged into power at all times. If power is unplugged, drain the
water completely from the water heater. Then use an air compressor to remove all water from inside the unit's water piping.
It is recommended that Isolation Valves are installed on the water heater, otherwise the water connections will need to be
removed to drain the unit completely. Freeze damage due to not draining properly will not be covered under warranty.

20
Periodic Maintenance
Regular Maintenance
Periodic Inspection
For laundry, newspaper, timber, oil,
spray cans and other combustible
materials near the heater or the
exhaust vent terminal.
For abnormal sounds
during operation.
For abnormalities in
external appearance,
discoloration or aws.
For water leaks from
the equipment and
piping.
For proper operation of
pressure relief valve.
For dust and soot
in the ue terminal.
Be sure to do.
To prevent burns or scalding, turn off the power button and
wait until the equipment cools before performing maintenance.
Check
Check
Check
Check
Check
Check
CAUTION
If the water drain valve (with water lter) is covered with debris, the hot water may not run
smoothly, or the unit may put out cold water. Check and clean the lter as explained below.
* Toavoidburns,waituntiltheequipmentcoolsdownbeforedrainingthewater. 
Theappliancewillremainhotafteritisturnedoff.
WaterDrainValve(withWaterFilter)
1. Close the water supply valve.
2. Open all hot water xtures.
3. With a bucket ready, remove the inlet and outlet
drain plugs (about 0.2 gallon (0.95L) will drain out)
4. Take the water drain valve (with water lter) out of
the inlet. (See illustration to right).
5. Clean the water drain valve (with water lter) with
a brush under running water.
6. Replace the water drain valve (with water lter)
and close the drain plugs.
(Take care not to lose the packing.)
7. Close all hot water xtures.
8. Open the water supply valve and check that
water does not leak from the drain plugs or water
drain valve (with water lter).
Water Supply
Valve
Inlet
Packing
Water drain valve
(with water lter)
(Ex. NR83DVC (GQ-2457WS-FFA US))
(Ex. NR83DVC (GQ-2457WS-FFA US))
(Ex. NR83OD (GQ-2457WS US))