A.O. Smith AOSRE50100 Operation, Filling, Temperature Regulation, Temperature Adjustment

OPERATION

CAUTION

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

DANGER

THEWATERHEATERISEQUIPPEDWITHANADJUSTABLETHERMOSTAT ORTHERMOSTATS TOCONTROLWATERTEMPERATURE. HOTWATER AT TEMPERATURES DESIRED FOR AUTOMATIC DISHWASHER AND LAUNDRYUSECANCAUSESCALDSRESULTINGINSERIOUSPERSONAL INJURYAND/ORDEATH. THETEMPERATUREATWHICHINJURYOCCURS VARIES WITH THE PERSON’S AGE AND TIME OF EXPOSURE. THE SLOWERRESPONSETIMEOFCHILDREN,AGEDORDISABLEDPERSONS INCREASESTHEHAZARDTOTHEM. NEVERALLOWSMALLCHILDREN TO USE A HOT WATER TAP, OR TO DRAW THEIR OWN BATH WATER. NEVER LEAVE A CHILD OR DISABLED PERSON UNATTENDED IN A BATHTUBORSHOWER.

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.

KEEPINGTHETHERMOSTATSETTINGAT120°FWILLREDUCETHERISK 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.

4.Replace the covers and access panels, and turn on heater electrical supply.

	ADJUSTABLE
	LOWER
	THERMOSTAT
	(FOR DUAL
	ELEMENT MODELS)
UPPER THERMOSTAT	ADJUSTABLE
(DUAL ELEMENT	LOWER
MODELS ONLY)	THERMOSTAT
	WITH HIGH LIMIT

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	Time to Produce 2nd & 3rd
Setting	Degree Burns on Adult Skin
170° F	Nearly instantaneous
160° F	About 1/2 second
150° F	About 1-1/2 seconds
140° F	Less than 5 seconds
130° F	About 30 seconds
125° F	About 2 minutes
120° F	More than 5 minutes

FIGURE 4

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. BECAUSE THE 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 OPERATIONBEFORERESETTING.

TEMPERATURE ADJUSTMENT

To change the temperature setting:

DANGER

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. FIGURE 5

5