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Rheem-052012-electric-hot-water-systems-thermostat

Thermostat R/S ST1203133 70 Degree 052012

$33.00

Thermostat
A device, responsive to temperature, which controls the supply of electrical energy to the element to maintain the stored water at the required temperature.Electric Water Heating Thermostats are designed for replacement on domestic and commercial water heaters. The Electric Thermostat is a surface contact temperature control device for water tanks heated by electric heaters (boilers) and solar heated tanks. It is placed next to the tank’s metal wall and has a bimetallic strip that is triggered in case of overheating.

Over Temperature Energy Cut out (E.C.O.)
A temperature-sensing device in combination with the thermostat that automatically cuts off the supply of electrical energy to prevent excessive water temperature occurring. This device will not reset automatically but may be manually reset once temperatures have fallen to a safe level. DETERMINE CAUSE OF OPERATION.

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Thermostat R/S ST1203133 70 Degree 052012

Bottom Thermostat

Personal Protective Equipment should be worn when conducting step 2 of this procedure to reduce the risk of electric shock.

  1. Isolate the power supply to the water heater and remove access cover.
  2. Confirm with multi-meter between each Active and Neutral at the terminal blockthat voltage is not present.
  3. Remove the thermostat protective cover and disconnect the wiring from the thermostat (Note wiring positions).
  4. Slide thermostat vertically out of clamp. Note the current temperature selected.
  5. Remove any scale or corrosion from cylinder surface.
  6. Slide replacement thermostat into place behind clamp, set temperature to that noted in step 4 and connect wiring to appropriate points (refer to “Wiring Diagrams” section on page 10). Note: Ensure thermostat face is in good contact with cylinder surface.
  7. Check water heater internal wiring insulation for cracking.
  8. Conduct an electrical insulation test (refer to “Electrical Insulation Testing” on page 28).
  9. Refit the thermostat protective cover and the lower access cover.
  10. Restore the power supply to the water heater.

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