PURGING
Gas line purging is required with new piping or systems in which air has entered.
CAUTION
PURGING SHOULDBEPERFORMEDBYPERSONSEXPERIENCEDINTHIS TYPE OF GAS SERVICE. TO AVOID RISK OF FIRE OR EXPLOSION, PURGEDISCHARGEMUSTNOTENTERCONFINEDAREASORSPACES WHEREIGNITIONCANOCCUR. THEAREAMUSTBEWELLVENTILATED ANDALLSOURCESOFIGNITIONMUSTBEINACTIVATEDORREMOVED.
CAUTION
THE"ON/OFF"SWITCHONTHECONTROLBOXSHOULDNOTBETURNED TOTHE"OFF"POSITIONUNLESSTHEUNITISBEINGSERVICED.
TEMPERATURE REGULATION
DANGER
THISWATERHEATERISEQUIPPEDWITHANADJUSTABLETHERMOSTAT TO CONTROL WATER TEMPERATURE. HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHING AND LAUNDRY USE CAN CAUSEPAINFULSCALDINGWITHPOSSIBLESERIOUSANDPERMANENT INJURY.THETEMPERATUREATWHICHINJURYOCCURSVARIESWITH THEPERSON’SAGEANDTHETIMEOFTHE EXPOSURE.THESLOWER RESPONSE TIME OF CHILDREN, AGED OR DISABLED PERSONS INCREASESTHEHAZARDSTOTHEM.NEVERALLOWSMALLCHILDREN TO USE A HOT WATER TAP, OR TO DRAW THEIR OWN BATH WATER. NEVER LEAVE A CHILD OR DISABLED PERSON UNATTENDED IN A BATHTUBORSHOWER.
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. Suitable covers are available through A.O. Smith Water Products Company, 5621 W. 115th Street, Alsip, IL 60803.
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 temperature dial be set for the lowest temperature that satisfies your hot water needs. This will also provide the most energy efficient operation of the water heater. The water temperature adjusting dial was factory set at the lowest temperature; all the way counterclockwise to the mechanical stop. Turning the dial counterclockwise 
decreases temperature and clockwise 
increases temperature.
SETTINGTHEWATERHEATERTEMPERATUREAT120°F(49°C)(APPROX.
"HOT" MARK ON FACE OF THE TEMPERATURE ADJUSTING DIAL) WILL REDUCE THE RISK OF SCALDS. Some states require settings at specific lower temperatures.
Figure 10 shows the approximate water temperatures produced at various thermostat dial settings. 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.
Valves for reducing point of use temperature by mixing cold and hot water are available. Also available are inexpensive devices that attach to faucets to limit hot water temperatures. Contact a licensed plumber or the local plumbing authority.
WATER TEMPERATURE
ADJUSTING DIAL
| Time to Produce 2nd & 3rd |
Temperature Setting | Degree Burns on Adult Skin |
VERY HOT = APPROX.180°F (82°C) | Almost Instantaneously |
C = APPROX.162°F (72°C) | About 1/2 Second |
B = APPROX. 145°F (63°C) | About 3 Seconds |
A = APPROX. 130°F (54°C) | More than 30 Seconds |
HOT = APPROX.120°F (49°C) | More than 5 Minutes |
LOW = approx.80°F (27°C) | No Hazard |
FIGURE 10
MAINTENANCE
CAUTION
DISCONNECT FROM ELECTRICAL SUPPLY BEFORE SERVICING UNIT. FORYOURSAFETY,WATERHEATERSERVICESHOULDBEPERFORMED ONLY BY A QUALIFIED SERVICE TECHNICIAN. READ THE GENERAL SAFETYINFORMATIONSECTIONFIRST.
USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE GAS CARRYINGCOMPONENTSOFTHISAPPLIANCESHOULDBEINSPECTED FOR PROPER OPERATION PERIODICALLY BY A QUALIFIED SERVICE TECHNICIAN.
MAIN BURNER
Check main burner every 12 months for proper flame characteristics. This is done by removing door(s) on heater. The main burner should provide complete combustion of gas; ignite rapidly; give reasonable quiet operation; cause no excessive flame lifting from burner ports. Make sure that the flow of combustion and ventilation air is not blocked.
If proper flame characteristics are not evident, check for accumulation of lint or other foreign material that restricts or blocks the air openings in the heater or burner. Also check AIR REQUIREMENTS.
WARNING
Should the main burner or burner air openings require cleaning, turn the control switch to “OFF” position and allow the burner to cool. Remove the burner and clean with a soft brush. Clean main burner orifice with a suitable soft material.
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