TEMPERATURE REGULATION
HIGH TEMPERATURE LIMIT CONTROLS (ECO)
Both the ELECTRONIC CONTROL and SURFACE MOUNT CONTROL model water heaters are equipped with one or more ECO (energy cut off) non adjustable high temperature limit control(s). An ECO is a normally closed switch that opens (activates) on a rise in temperature. If the ECO switch contacts open (activate) due to abnormally high water temperatures it will
Surface Mount Control Models
Surface Mount Control models have multiple surface mounted Thermostat/ECO combination controls. One for each installed heating element - see the Surface Mount Control wiring diagrams in this manual. The ECO high temperature limit switch contacts on each control will open when the tank temperature reaches approximately 200°F/93°C. When the ECO switch contacts open (activate) voltage to ONE heating element ONLY is terminated to prevent further heating operation of that element. Voltage may still be present at other heating elements and they may still be heating the water.
The ECO is a manual reset switch. Should one or more ECO activate, the tank temperature must drop below 120°F/49°C before an ECO can be reset. To manually reset an ECO:
1.Disconnect the power supply to the water heater.
2.Allow the tank temperature to cool below 120°F/49°C.
3.Remove the front control cover from the effected control(s).
4.Press the manual reset button on each of the effected controls.
Once the control(s) has been reset the control cover should be replaced prior to restoring power to the water heater.
Electronic Control Models
The ECO high temperature limit switch is located inside the immersion Temperature Probe (two red wires) on ELECTRONIC CONTROL models. The ECO switch contacts will open when the water temperature reaches approximately 202°F/94°C. When the ECO switch contacts open (activate) the electronic control system locks out and displays a Fault message. Voltage to the contactor coils and heating elements is terminated to prevent further heating operation.
Should the ECO activate, the water temperature must drop below 140°F/60°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 CONTROLS
The water heaters covered in this instruction manual are equipped with adjustable thermostat controls 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 persons age and duration of exposure. The slower response time of children, the elderly or disabled persons increases the hazards to them. 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 water heater temperatures at 120°f will reduce the risk of scalds. Some States require settings at specific lower temperatures.
THERMOSTAT SETTINGS - SURFACE MOUNT CONTROL
These models have multiple thermostat/ECO combination controls one for each heating element installed. These thermostats are set from the factory at 140°F/60°C. Set the thermostat dial at the lowest setting which produces an acceptable hot water supply. This will always give the most energy efficient operation.
Figure 4 shows the approximate
Temperature |
| Time to Produce 2nd & 3rd |
Settings |
| Degree Burns on Adult Skin |
|
|
|
180°F (82°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 |
80°F (27°C) |
| - - - - - - - - - - - - - - - - |
| FIGURE 4 | |
20
