31
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
inexpen sive de vices  that a ttach  to fau cets t o limi t hot w ater
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 hig h limit switch activate, th e control system will
automaticallyresetthe unitoncethewaterte mperatureinthe
tankfallsbelow140° F/60°C.Iftheunitis manuallyshutdown
andrestarted,as longasthetemp eratureinthetank islower
than160°F/71°C,theunitwillresetandinitiateoperati on.
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
 valve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,shall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 AU TOMATIC 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.