A.O. Smith 197835-001 Water Heater User Manual


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ThewatertemperatureiscontrolledusingtheTemperature
ControlontheDisplayatthefrontoftheunit(SeeFigure1).
Thiscontrolutilizesatemperatureprobetodeterminethetank
temperature.Theprimarytemperatureprobeislocatedatthe
topofthetank.
Thetemperaturemaybeadjustedfrom90°F/32°Cto160°F/71°C.
Thethermostatwasadjustedto120°F/49°Cbeforetheheater
wasshippedfromthefactory.Itisrecommendedthatlowerwater
temperaturebeusedtoavoidtheriskofscalding.Itisfurther
recommended,inallcases,thatthewatertemperaturebeset
forthelowesttemperaturewhichsatisfiesyourhotwaterneeds.
Thiswillalsoprovidethemostenergyefficientoperationofthe
waterheaterandminimizescaleformation.
Valvesforreducingthepoint-of-usetemperaturebymixingcold
andhotwaterareavailable,seeFigure2.Alsoavailableare
inexpensivedevices that attachtofaucets tolimit hot water
temperatures.Contactalicensedplumberorthelocalplumbing
authority.
Thetablebelowshowstheapproximatetime-to-burnrelationshipfor
normaladultskin.Shortrepeatedheatingcyclescausedbysmall
hotwaterusescancausetemperaturesatthepointofusetoexceed
thethermostatsettingbyupto20°F/11°C.Ifyouexperiencethis
typeofuse,youshouldconsiderusinglowertemperaturesettings
toreducescaldhazards.
160°F(71°C) About1/2Second
150°F(65°C) About11/2Seconds
140°F(60°C) Lessthan5Seconds
130°F(54°C) Morethan30Seconds
120°F(49°C) Morethan5minutes
HI LIMIT SWITCH (E.C.O.)
Thetopimmersionwellofthedualbulbcontrolleralsocontains
thehigh
limit(energycutoff)sensor.Thehighlimitswitch
interruptsmainburner
gasflowshouldwatertemperaturereach
approximately202°F/94°C.
Shouldthehighlimitswitchactivate,thecontrolsystemwill
automaticallyresettheunitoncethewatertemperatureinthe
tankfallsbelow140°F/60°C.Iftheunitismanuallyshutdown
andrestarted,aslongasthetemperatureinthetankislower
than160°F/71°C,theunitwillresetandinitiateoperation.
Ifyouexperiencehigherthanusualwatertemperaturealongwith
frequentautomaticresettingofthesystem,thisisevidenceofhigh
limitswitchoperation.Thefollowingarepossiblereasonsforhigh
limitswitchoperation.
• Amalfunctioninthethermostaticcontrolswouldallowthegas
controlvalvethermostattoremainopencausingwater
temperaturetoexceedthethermostatsetting.Thewater
temperature would continue to rise until high limit
switchoperation.
Contactyourdealerorservicerifcontinuedhighlimitswitch
operationoccurs.
TEMPERATURE REGULATION
Time to Produce
2nd & 3rd Degree
Temperature Setting Burns on Adult Skin
Itisrecommendedthatlowerwatertemperaturesbeusedtoavoid
theriskofscalding.Itisfurtherrecommended,inallcases,thatthe
watertemperaturesbesetforthelowesttemperaturewhichsatises
yourhotwaterneeds.Thiswillalsoprovidethemostenergyefcient
operationofthewaterheater.
HOTWATERCANSCALD:Waterheatersareintendedtoproduce
hotwater.Waterheatedtoatemperaturewhichwillsatisfyspace
heating,clotheswashing,dishwashing,andothersanitizingneeds
canscaldandpermanentlyinjureyouuponcontact.Somepeople
aremorelikelytobepermanentlyinjuredbyhotwaterthanothers.
Theseincludetheelderly,children,theinrm,orphysically/mentally
handicapped.Ifanyoneusinghotwaterfromthisheatertsinto
oneofthesegroupsorifthereisalocalcodeorstatelawrequiring
acertaintemperaturewateratthehotwatertap,thenyoumust
takespecialprecautions.Inadditiontousingthelowestpossible
temperaturesettingthatsatisesyourhotwaterneeds,ameans
suchasamixingvalve,shouldbeusedatthehotwatertapsused
bythesepeopleoratthewaterheater.Mixingvalvesareavailable
atplumbingsupplyorhardware stores,seeFigure2.Follow
manufacturer’sinstructionsforinstallationofthevalves.Before
changingthefactorysettingonthethermostat,readthe“Temperature
Regulation”sectioninthismanual.
Neverallowsmallchildrentouseahotwatertap,ortodrawtheirown
bathwater.Neverleaveachildorhandicappedpersonunattended
in a bathtub or shower.
Thewaterheatershouldbelocatedinanareawherethegeneral
publicdoesnothaveaccess.Ifasuitableareaisnotavailable,
a covershouldbe installed over thethermostat to prevent
tampering.Thewater temperaturesettingwas factory set at
thelowesttemperature;THISWATERHEATERISEQUIPPED
WITH AN ADJUSTABLE THERMOSTAT TO CONTROL WATER
TEMPERATURE. HOT WATER TEMPERATURES REQUIRED
FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN
CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL
INJURYAND/ORDEATH.THETEMPERATUREAT WHICH
INJURYOCCURSVARIESWITHTHEPERSON’SAGEANDTHE
TIME OF THE EXPOSURE. THE SLOWER RESPONSE TIME
OF CHILDREN, AGED OR DISABLED PERSONS INCREASES
THE HAZARDS TO THEM. NEVER ALLOW SMALL CHILDREN
TO USE A HOT WATER TAP, OR TO DRAW THEIR OWN BATH
WATER. NEVER LEAVE A CHILD OR DISABLED PERSON
UNATTENDED IN A BATHTUB OR SHOWER.
THE WATER HEATER SHOULD BE LOCATED IN AN AREA
WHERE THE GENERAL PUBLIC DOES NOT HAVE ACCESS TO
SET TEMPERATURES.
SETTINGTHEWATERHEATERTEMPERATUREAT120°F/49°C
WILLREDUCETHERISKOFSCALDS.Somestatesrequire
settingsatspecificlowertemperatures.
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