Installation Sheet

EX07200-88 Rev. A
7
DESCALING THE HEATING ELEMENT
Scale deposits can affect the heating capability of the element. Heavy scale can even cause the element to
burn out. The element can be descaled chemically or manually.
1. Remove the heating element (see above).
2. To descale chemically, soak the heating element in white vinegar or other descaling solution and
then rinse well with fresh water.
3. To descale manually, let element dry and then using a non-metallic brush similar to a tooth brush;
brush the residue from the element. Avoid damaging the surface of the element.
4. Reinstall the element and gasket.
5. Refill tank with water before turning on the power to the water heater.
REPLACING THE HEATING ELEMENT
1. Disconnect power and drain the water heater (see prior instructions).
2. Remove heating element noting original positions of all connections.
3. Install new element with gasket making sure the new element and gasket are positioned correctly.
4. Tighten retaining nuts and make the wire connections to their original locations.
CHANGING THE THERMOSTAT
1. Turn off the power switch and disconnect the water heater from the power supply.
2. Drain and remove the water heater. (see page 12)
3. Remove the bottom panel of the water heater.
4. Remove thermostat knob and unscrew two retaining screws. It may be necessary to pry the knob off
of the thermostat spindle. Now remove front panel.
5. Disconnect the push-pull wire connectors on the thermostat noting which connector goes to which
terminal. Terminals are marked.
6. Remove the thermostat probe from the well.
7. Install new thermostat, attach wires and tighten screws.
RESETTING THE HIGH LIMIT SWITCH
For various reasons the high limit safety shut off switch will occasionally shut the water heater down. This
shut down will occur when water temperatures exceed 190F. Power is automatically turned off to the
heating element. The shut off device may activate as a result of a power outage or an electrical storm.
NOTE: Do not attempt to reset the high limit switch without first allowing the water heater to cool down the
high temperature water inside the heater.
WARNING: Do not tamper with the reset button to override overheating shut down.
1. Turn off the power switch and disconnect the water heater from the power supply.
2. Drain and remove the water heater. (see page 12)
3. Remove the bottom panel of the water heater.
4. Locate the high limit reset button.
5. Depress the small red button in the center of the junction box, replace the bottom panel and place
the water heater back into service.
NOTE: A lower temperature setting saves energy and reduces the risk of scalding.
CAUTION: Call a technician if the high limit needs to be reset frequently.