Component Replacement Procedures; Tm012 Rheem Electric Water Heaters Service Instructions Rev: B - Rheem TM012 Service Instructions Manual

Component Replacement Procedures

Draining the Water Heater (Procedure 1)
Elevated temperatures may be present during the draining process.
Personal Protective Equipment should be worn to prevent the risk of
scalding.
Personal Protective Equipment should be worn when conducting step 3 of
this procedure to reduce the risk of electric shock. Refer to Rheem Safety
Procedure on electrical testing.
1. Isolate the power and water supplies to the water heater and remove lower access
cover.
2. Relieve pressure from the water heater through T & PR valve or a hot tap.
3. Confirm with a multi-meter between each Active and Neutral at the terminal block
that voltage is not present.
4. Disconnect the cold water supply pipe.
5. Fit a drain hose to the cold water connection and run the other end to a drain or safe
location.
6. Open the temperature and pressure relief valve to allow air into the system.
Temperature and Pressure Relief Valve (Procedure 2)
Never fit a T&PR valve with a rating higher than that indicated on the water
heater rating plate. Do not use reconditioned T&PR valves.
1. Isolate the power and water supplies to the water heater.
2. Relieve pressure from the water heater through the T & PR valve or a hot tap.
3. Remove the drain line from the T&PR valve.
4. Unscrew the T&PR valve and remove.
A quantity of hot water will discharge from the tank during this process.
Personal Protective Equipment should be worn to prevent scalds or burns.
5. Confirm the replacement T&PR valve is the correct rating and refit using thread tape.
6. Refit the drain line.
7. Close the hot tap and restore water supply.
8. Check T&PR valve thread for leaks.
9. Operate the T&PR valve lever to reset relief drain.
10. Purge air from the system through hot taps.
11. Restore the power supply to the water heater.

TM012 Rheem Electric Water Heaters Service Instructions REV: B

Date of Issue: 03/06
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