4
The water temperature is controlled by two thermostats. One
thermostat is located near the top of the tank and the other is in
the lower part of the tank. The upper thermostat must be set at
least 5°F higher than the lower thermostat. In the case where the
water heater has electronic thermostats, this differential has been
factory set and cannot be changed.
The thermostat temperature dials are accessible by opening the
control compartment cover.
FIGURE 1
A high limit switch interrupts the power burner operation should
the water temperature reach 200°F.
The high limit switch must be manually reset by depressing the
red button on the front of the control when water temperature
drops to about 180°F. The manual reset high limit can be found
inside the control compartment.
INSTALLATION INSTRUCTIONS
REQUIRED ABILITY
INSTALLATION OR SERVICE OF THIS WATER HEATER IS
REQUIRED TO BE PERFORMED BY AN AUTHORIZED A.O.
SMITH STARTUP AGENT. PLUMBING, AIR SUPPLY, VENTING,
GAS SUPPLY AND ELECTRICAL WORK ARE REQUIRED.
UNCRATING
The heater should be moved in the crate as close as possible to
the installation site. Depending upon size, shipping weights range
from about 1,300 to 4,500 pounds.
The installer should be guided by the instructions furnished with
the heater, local codes and utility company requirements.
Preference should be given to codes and requirements where
they differ from the heater furnished instructions.
Additional publications, which should guide the installer, include:
The latest version of the National Fuel Gas Code, ANSI Z223.1,
from American Gas Association Laboratories, 8501 East
Pleasant Valley Road, Cleveland, OH 44131.
In Canada – CGA No. B149 (latest version), from Canadian
Gas Association Laboratories, 55 Scarsdale Road, Don Mills,
Ontario, Canada M3B 2R3.
Code for the installation of Heat Producing Appliances (latest
version), from American Insurance Association, 85 John Street,
New York, NY 11038.
Note: Some gas utility companies derate the heating value of the
supplied gas at high elevations. Your authorized A.O. Smith Start-
Up Agent must adjust for actual heating valve of the gas at the
time of start-up.
FEATURES
WATER TEMPERATURE CONTROL
WARNING
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 TIME OF EXPOSURE.
THE SLOWER RESPONSE TIME OF DISABLED PERSONS
INCREASES THE HAZARDS TO THEM. NEVER ALLOW SMALL
CHILDREN TO USE 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 WILL
REDUCE THE RISK OF SCALDS.
Some states or provinces
require settings at specific lower temperatures.
Below you will find listed the appropriate 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.
Temperature
Time to Produce 2nd & 3rd
Setting
Degree Burns on Adult Skin
180°F (82°C)
Nearly Instantaneous
170°F (77°C)
Nearly Instantaneous
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)
About 30 Seconds
120°F (49°C)
More than 5 Minutes
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.
