Operation; Temperature Regulation; Temperature Adjustment - A.O. Smith AOSRE50100 Owner's Manual

NEVER OPERATE THE HEATER WITH THE COLD WATER INLET VALVE
CLOSED OR WITHOUT FILLING WITH WATER PER THE FILLING
INSTRUCTIONS. FAILURE TO DO SO WILL CAUSE DAMAGE AND CAN
VOID ELEMENT WARRANTY.
FILLING
1. Close the water heater drain valve. (Turn clockwise
2. Open a nearby hot water faucet to permit air to escape.
3. Fully open the cold water inlet valve, filling the heater and piping.
4. Close the hot water faucet when water flows.
5. Turn the water heater electrical switch on.

TEMPERATURE REGULATION

THE WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE THERMOSTAT
OR THERMOSTATS TO CONTROL WATER TEMPERATURE. HOT WATER
AT TEMPERATURES DESIRED FOR AUTOMATIC DISHWASHER AND
LAUNDRY USE CAN CAUSE SCALDS 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 CHILDREN, AGED OR DISABLED PERSONS
INCREASES THE HAZARD 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.
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 thermostats (See Figure 4) 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. Thermostat(s) are factory
set at 120°F (49°C) unless specified differently by state requirements.
KEEPING THE THERMOSTAT SETTING AT 120°F WILL REDUCE THE RISK
OF SCALDS.
Figure 4 shows the approximate time-to-burn relationship for normal
adult skin. The thermostats on your water heater have a linear
relationship between degrees of angular rotation and the corresponding
change in temperature. Thus rotating the temperature adjustment indicator
40 angular degrees will result in a 10 degree Fahrenheit change in water
temperature.

TEMPERATURE ADJUSTMENT

To change the temperature setting:
1. Turn off the heater electrical supply. Do not attempt to adjust thermostat
with power on.
2. Remove the thermostat access panels and covers from the
thermostats. Do not remove the plastic personnel protectors covering
the thermostats.
3. Using a flat tip screwdriver, rotate the adjusting knob to the desired
temperature setting.

OPERATION

CAUTION
).
DANGER
DANGER
4. Replace the covers and access panels, and turn on heater electrical
supply.
ADJUSTABLE
THERMOSTAT
(FOR DUAL
ELEMENT MODELS)
UPPER THERMOSTAT
(DUAL ELEMENT
MODELS ONLY)
TEMPERATURE SETTINGS
HOT - Is a thermostat setting of approximately 120° F,
which will supply hot water at the most
economical temperatures..
A - Is a thermostat setting of approximately 130° F.
B - Is a thermostat setting of approximately 140° F.
C - Is a thermostat setting of approximately 150° F.
VERY HOT - Is a thermostat setting of approximately 160° F.
It is recommended that the dial be set lower
whenever possible.
Temperature
Setting
170° F
160° F
150° F
140° F
130° F
125° F
120° F
Valves for reducing point-of-use temperature by mixing cold and hot
water are available (see Figure 5). Also available are inexpensive devices
that attach to faucets to limit hot water temperatures. Contact a licensed
plumber or the local plumbing authority.
A non-adjustable high temperature limit control operates before steam
temperatures are reached. The high limit is in the same area as the upper
thermostat and must be reset manually when it operates.
HIGH LIMIT OPERATES ONLY WHEN ABNORMALLY HIGH WATER
TEMPERATURES ARE PRESENT, IT IS IMPORTANT THAT A QUALIFIED
SERVICE AGENT BE CONTACTED TO DETERMINE THE REASON FOR
OPERATION BEFORE RESETTING.
5
LOWER
ADJUSTABLE
LOWER
THERMOSTAT
WITH HIGH LIMIT
Time to Produce 2nd & 3rd
Degree Burns on Adult Skin
Nearly instantaneous
About 1/2 second
About 1-1/2 seconds
Less than 5 seconds
About 30 seconds
About 2 minutes
More than 5 minutes
FIGURE 4
BECAUSE THE
FIGURE 5