Temperature Regulation; Temperature Adjustment; Operating The Temperature Control System; Water Temperature Adjustment - A.O. Smith DIRECT VENTED GAS MODELS Installation And Operating Manual

TEMPERATURE REGULATION

Temperature Adjustment

Valves for reducing the point-of-use temperature by mixing
cold and hot water are available (see Figure 8). Also
available are inexpensive devices that attach to faucets to
limit hot water temperatures. Contact a licensed plumber
or the local plumbing authority.
Note: During low demand periods, a lower thermostat
setting will reduce energy losses and may satisfy your
normal hot water needs. If hot water use is expected to
be more than normal, a higher thermostat setting may be
required to meet the increased demand. When leaving
your home for extended periods (e.g., vacations etc.) turn
the temperature dial to its lowest setting. This will maintain
the water at low temperatures with minimum energy losses
and prevent the tank from freezing during cold weather.
GAS CONTROL VALVE/THERMOSTAT
SETTINGS
GAS CONTROL/
TEMPERATURE KNOB
STATUS
LIGHT
120°F
MARK
91°F
MARK
IGNITER
Figure 31
The thermostat is adjusted to the "OFF" position when
it is shipped from the factory. Water temperature can be
regulated by moving the temperature dial to the preferred
setting. The preferred starting point is 120°F at the "HOT"
setting. Align the knob with the desired water temperature
as shown in Figure 31. There is a hot water scald potential
if the thermostat is set too high.
Note: Temperatures shown on the gas control valve/
thermostat are approximates. The actual temperature of
the heated water may vary.
TEMPERATURE REGULATION
130°F 140°F 150°F 155°F
MARK MARK MARK MARK
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Important: Adjusting the thermostat past the 120°F mark
on the temperature dial will increase the risk of scald injury.
Hot water can produce fi rst degree burns within:
Water Time for 1st
Temperature Degree Burns
°F (Less Severe Burns)
110 (normal shower temp.)
116 (pain threshold)
116 35 minutes
122 1 minute
131 5 seconds
140 2 seconds
149 1 second
154 instantaneous
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong,
Sept. 15,1978)
Table 2
Should overheating occur or the gas supply fail to shut off,
turn "OFF" the manual gas shut-off valve to the appliance
(see Figure 1, item 18).
OPERATING THE TEMPERATURE CONTROL
SYSTEM

Water Temperature Adjustment

The water temperature setting can be adjusted from 91°F
to 155°F . Turn the Gas Control Valve/Temperature Knob
to the desired setting/temperature.
Note: The temperatures indicated are approximates. The
actual temperature of the heated water may vary.

Operating Modes And Settings

Standard Mode - The controller adjusts the water heater
to maintain the temperature set by the user.
Setting for vacation - The "LOW" position sets the controller
at approximately 91°F . This setting is recommended for
times when the water heater will not be in use for an
extended period of time. It effectively turns the controller
temperature setting down to a temperature that prevents
the water in the water heater from freezing while still
conserving energy.
Time for Permanent
Burns 2nd & 3rd
Degree (Most
Severe Burns)
45 minutes
5 minutes
25 seconds
5 seconds
2 seconds
1 seconds
29