Temperature Regulation
High Temperature Limit Control (ECO)
This water heater is equipped with an ECO (energy cut off) non adjustable high temperature limit switch. The ECO is a normally closed switch that opens (activates) on a rise in temperature.
The ECO is located inside the Upper Temperature Probe (two red wires), see pages 8 and 9 for location. The ECO switch contacts will open when the water temperature reaches approximately 202°F (94°C) and close at approximately 140°F (49°C).
If the ECO activates (contacts open) due to abnormally high water temperatures in the storage tank the control system will immediately
Should the ECO activate, the water temperature must drop below 140°F (49°C) before the control system can be reset. Once the water temperature has cooled below this point the power supply to the water heater must be turned off and on again to reset the control system.
Thermostat Control
Water temperature over 125°F (52°C) can cause severe burns instantly resulting in severe injury or death.
Children, the elderly and the physically or mentally disabled are at highest risk for scald injury.
Feel water before bathing or showering.
Temperature limiting devices such as mixing valves must be installed when required by codes and to ensure safe temperatures at fixtures.
Hot water temperatures required for automatic dishwasher and laundry use can cause scald burns resulting in serious personal injury and/or death. Table 10 shows the approximate
The temperature at which injury occurs varies with the person’s age and duration of exposure. The slower response time of children, the elderly or disabled persons increases the hazards to them. If anyone using hot water provided by the water heater being installed fits into one of these groups or if there is a local code or state law requiring a certain water temperature at the point of use, then special precautions must be taken.
In addition to using the lowest possible temperature setting that satisfies the demand of the application a mixing valve can be installed at the water heater (see Figure 8 on page 15) or at the hot water taps to further reduce system water temperature.
Never allow small children to use a hot water tap or draw their own bath water. Never leave a child or 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 Operating Set Point at 120°F (49°C) will reduce the risk of scalds. Some States require settings at specific lower temperatures.
Table 10
Water Temperature | Time to Produce 2nd & 3rd | |
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 (66°C) | About |
140°F (60°C) | Less than 5 seconds |
130°F (54°C) | About 30 seconds |
120°F (49°C) | More than 5 minutes |
The water heaters covered in this manual are equipped with an electronic control system to regulate the water temperature inside the storage tank. The control system senses temperature from two factory installed temperature probes, one installed in the top of the storage tank and one installed near the bottom, See Top Views on page 8 and Figure 5 on page 10 for location.
The “Operating Set Point” is adjusted to regulate water temperature inside the storage tank. This is an adjustable user setting in the control system’s “Temperatures Menu.” This and all control system menus are accessed through the UIM (user interface module) located on the front of the water heater, see Figure 55.
The Operating Set Point is adjustable from 90°F (42°C) to 180°F (82°C). The factory setting is 120°F (49°C). See Operating Set Point And Differential Adjustment on page 47 for instructions on how to adjust the Operating Set Point and other user settings.
Set the Operating Set Point at the lowest setting which produces an acceptable hot water supply. This will always provide the most energy efficient operation.
High Temperature Applications
Higher operating temperatures cause more wear on all water heaters and will decrease the life span of the appliance. Consider installing a small booster water heater for high temperature applications, such as commercial dishwashers, to raise the outlet temperature from the larger primary water heater to the desired point of use temperature.
Contact your local distributor or call the technical support phone number listed on the back cover of this manual for further technical assistance.
MANUFACTURER / MODEL INFORMATION |
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Tank Temperature |
| 103°F | UP |
Operating Set Point |
| 120°F | |
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Status: Heating |
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OFF |
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| DN |
GAS | O |
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| N |
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MENU |
| HELP |
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Figure 55
43
