A.O. Smith DSE-5 THRU DSE-120 warranty Operation, Filling, Start UP, Temperature Regulation

OPERATION

GENERAL

Never operate the heating elements without being certain the water heater is filled with water, and a temperature and pressure relief valve is installed in the relief valve opening.

FILLING

1.Turn off the electrical disconnect switch.

2.Close the water heater drain valve by turning knob to right (clockwise).

3.Open a nearby hot water faucet to permit the air in the system to escape.

4.Fully open the cold water inlet valve allowing the heater and piping to be filled.

5.Close the hot water faucet as water starts to flow. The heater is now ready for START UP and TEMPERATURE REGULATION.

START UP

The following checks should be made by the installer when the heater is placed into operation for the first time.

1.Open the hinged access door, check all water and electrical connections for tightness. Also check connections on top and side of heater.

•Repair water leaks and tighten electrical connections as necessary.

2.Depress red button on manual reset high limit switch.

3.Turn on the electrical disconnect switch.

4.Observe the operation of the electrical components during the first heating cycle. Use care as the electrical circuits are energized.

•Thermostat and contactor operation should be checked by (a) manually operating thermostat and

(b)allowing the heater to come up to temperature and shutoff automatically.

•The thermostat operates all contactor coils simultaneously.

5.Close the access door.

TEMPERATURE REGULATION

DANGER

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 A HOT WATER TAP, OR TO DRAW THEIR OWN BATH WATER. NEVER LEAVE A CHILD 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 require settings at specific lower temperatures.

Figure 1 shows the approximate time-to-burn relationship for normal adult skin.

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
	FIGURE 1

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.

The thermostat factory setting is 130°F. The dial is adjustable through a range of 95° to 194°.

The thermostat is behind the front access door. TURN OFF THE ELECTRICAL DISCONNECT SWITCH BEFORE OPENING DOOR.

•It is suggested the thermostat be turned to the lowest setting which satisfies the hot water requirements of the system. This helps minimize water scale formations on the heating elements.

•The thermostat contacts close on about 6°F (not adjustable) drop in water temperature.

•Where multiple thermostats are used, they may be all set at the same temperature or 2° to 4°F apart to achieve “step control”. The bottom thermostat is set the hottest and top thermostat the coolest.

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