TM012 Rheem Electric Water Heaters Service Instructions REV: B
Date of Issue: 03/06
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Top Thermostat – Non-simultaneous (Procedure 5)
Personal Protective Equipment should be worn when conducting step 2 of
this procedure to reduce the risk of electric shock. Refer to Rheem Safety
Procedure on electrical testing.
1.
Isolate electrical supply
and remove upper and lower front covers.
2.
Confirm with multi-meter between each Active and Neutral at the terminal block
that voltage is not present.
3. Remove the protective cover and disconnect wiring from the thermostat (Note wiring
positions).
4. Slide thermostat vertically out of clamp.
5. Clean any corrosion from cylinder wall.
6. Slide replacement thermostat into place behind clamp and connect wiring to
appropriate points. Refer to Wiring Diagram on page 7.
7. Check water heater internal wiring insulation for cracking.
8. Refit the thermostat protective cover and upper access cover securely.
9. Conduct an electrical insulation test. Refer to page 25.
10. Replace lower access cover and restore electrical supply.
Bottom Thermostat – Trade Adjustable (Procedure 6)
Personal Protective Equipment should be worn when conducting step 2 of
this procedure to reduce the risk of electric shock. Refer to Rheem Safety
Procedure on electrical testing.
1.
Isolate the power to the water heater
and remove access cover.
2.
Confirm with multi-meter between each Active and Neutral at the terminal block
that voltage is not present.
3. Remove the thermostat protective cover and disconnect the wiring from the thermostat.
4. Slide the thermostat out from under the retaining clamp. Note the current temperature
selected.
5. Remove any scale from the cylinder surface
6. Slide the replacement thermostat under the clamp and set temperature to that noted in
step 4. Reconnect the wiring as per the circuit diagram on page 7.
7. Check water heater internal wiring insulation for cracking.
8. Conduct an electrical insulation test. Refer to page 25.
9. Refit the thermostat protective cover and the lower access cover.
10. Restore the power supply.
