8
DRAFT HOOD OPERATION
Check draft hood operation by performing a worst case depressur-
ization of the building. With all doors and windows closed, and with
all air handling equipment and exhaust fans operating, such as fur-
naces, clothes dryers, range hoods and bathroom fans, a match
flame should still be drawn into the draft hood of the water heater
with its burner firing. If the flame is not drawn toward the draft hood,
shut off water heater and make necessary air supply changes to
correct.
TEMPERATURE REGULATION
DANGER
THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE
THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT
WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISH-
WASHER AND LAUNDRY USE CAN CAUSE PAINFUL SCALD-
ING WITH POSSIBLE SERIOUS AND PERMANENT INJURY. THE
TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE
PERSON'S AGE AND THE TIME OF EXPOSURE. THE SLOWER
RESPONSE OF CHILDREN, AGED OR DISABLED PERSONS IN-
CREASES THE HAZARDS TO THEM. NEVER ALLOW SMALL
CHILDREN TO USE A HOT WATER TAP, OR TO DRAW THEIR
OWN BATH WATER. NEVER LEAVE CHILD OR DISABLED PER-
SON 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.
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, Figure 1, be set for the lowest temperature
which satisfies your hot water needs. This also will provide the
most energy efficient operation of the water heater. The water tem-
perature adjusting dial was factory set at the lowest temperature;
all the way clockwise to the mechanical stop. Turning the dial coun-
terclockwise
increases temperature, and clockwise
reduces temperature.
SETTING THE WATER HEATER TEMPERATURE AT 120°F
(APPROX.
MARK ON FACE OF THERMOSTAT) WILL REDUCE
THE RISK OF SCALDS.
Some states require settings at specific
lower temperatures.
Figure 4 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 30°F. If you
experience this type of use you should consider using lower tem-
perature settings to reduce scald hazards.
Time to Produce 2nd & 3rd
Temperature Setting
Degree Burns on Adult Skin
VERY HOT = approx. 160°F
About 1/2 second
C = approx. 150°F
about 1-1/2 seconds
B = approx. 140°F
Less than 5 seconds
A = approx. 130°F
About 30 seconds
= approx. 120°F
More than 5 minutes
LOW =approx. 80°F
- - - - - - - - - - - - - - - -
FIGURE 4
Valves for reducing the point-of-use temperatures by mixing cold
and hot water are available (See fig.2) . Also available are inexpen-
sive devices that attach to faucets to limit hot water temperatures.
Contact a licensed plumber or the local plumbing authority.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL
TO SHUT OFF, TURN OFF THE MAIN MANUAL GAS SHUTOFF
VALVE TO THE APPLIANCE. SEE FIGURE 1 (H).
MAINTENANCE
FOR YOUR SAFETY, WATER HEATER SERVICE SHOULD BE
PERFORMED ONLY BY A QUALIFIED SERVICE TECHNICIAN.
READ THE GENERAL SAFETY INFORMATION SECTION FIRST.
USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS
COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE GAS
CARRYING COMPONENTS OF THIS APPLIANCE SHOULD BE
INSPECTED FOR PROPER OPERATION PERIODICALLY BY A
QUALIFIED SERVICE TECHNICIAN.
PILOT AND MAIN BURNER
Check pilot and main burner every 12 months for proper flame
characteristics. This is done by removing door(s) on heater, fig. 1.
The main burner should provide complete combustion of gas; ignite
rapidly; give reasonably 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 accumula-
tion of lint or other foreign material that restricts or blocks the air
openings in the heater or burner. Also check AIR REQUIRE-
MENTS.
