Water Temperature Adjustment; Operating Modes And Settings - A.O. Smith High Efficiency 100 series Installation Instructions Manual

STATUS
ON
OFF
LOW
VAC
Gas Control/Temperature Knob
110°F (Approx.)
NOTE: During low demand periods when hot water is not
being used, 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

Water Temperature Adjustment

The water temperature setting can be adjusted from 70°F to
160°F. Turn the Gas Control/Temperature Knob to the desired
setting/temperature.
NOTE: The temperatures indicated are approximates. The actual
temperature of the heated water may vary.
Status Light Code
Table 5
LED FLASH SEQUENCE
Short flash once every four second
"Heartbeat", alternates bright/dim
One Flash, three second pause
Two Flash, three second pause
Three Flash, three second pause
Four Flash, three second pause
Five Flash, three second pause
Six-One Flash, three second pause
Six-Two Flash, three second pause
Six-Three Flash, three second pause
Six-Four Flash, three second pause
Seven Flash, three second pause
Eight-One Flash, three second pause
Eight-Two Flash, three second pause
Eight-Three Flash, three second pause
Eight-Four Flash, three second pause
* Soft Lockout - 20 minute wait before returning to normal mode.
160°F (Approx.)
Status Light
120°F
Position
LOW
VAC
70°F (Approx.)
IDLE (No call for heat, no fault conditions)
Call for Heat (No fault conditions)
Low Flame Signal (control continues to operate)
End Switch Failed Closed
End Switch Failed Open or TCO Limit Lockout
ECO Limit Lockout (Overheat Failure)
Flame Out of Sequence
Soft Lockout* - Retry Limit - Failed TFI (Trial for Ignition)
Soft Lockout* - Recycle Limit - Flame Lost - END Switch Fails
Soft Lockout* - Recycle Limit - Flame Lost
Soft Lockout* - Flame out of Sequence Sensed
Flammable Vapor Sensor (FVS) Lockout
Flammable Vapor Sensor (FVS) Fault Detected
Temperature Sensor Fault Detected
Electronic Fault Detected
Gas Control Valve/Thermostat Fault Detected
Water
Temperature
°F (Less Severe Burns)
110 (normal shower temp.)
116
116
122
131
140
149
154
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15,1978)
FIGURE 22.
demand. When leaving your home for extended periods
(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.

Operating Modes and Settings

• Standard Mode - The controller adjusts the water
heater to maintain the temperature set by the user.
• Vacation Setting - The Vacation Setting (VAC) sets
the controller at approximately 70°F. This setting is
recommended when the water heater is not in use for a
long period of time. This effectively turns the controller
temperature setting down to a temperature that
prevents the water in the water heater from freezing
while still conserving energy.
CONTROL STATUS
21
Time for 1st Time for Permanent Burns
Degree Burn 2nd & 3rd Degree
(Most Severe Burns)
(pain threshold)
35 minutes
1 minute
5 seconds 25 seconds
2 seconds
1 second
instantaneous
45 minutes
5 minutes
5 seconds
2 seconds
1 second