Rheem 310 Series Service Instructions Manual page 49

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. Wear
Personal Protective Equipment 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.
Dip Tube (Procedure 3)
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. Disconnect the hot water line from the outlet of the water heater.
A quantity of hot water will discharge from the outlet during this process.
Wear Personal Protective Equipment to prevent scalds or burns.
4. Using a flat blade screwdriver gently split the outer rim at the top and bottom of the dip
tube face and prise the dip tube out of the cylinder fitting.
5. Fit the replacement dip tube into the cylinder fitting ensuring the flat lines up with the
fitting (dip tube facing up) and gently drive the dip tube into the fitting a short distance.
6. Reconnect the plumbing; this will push the dip tube into the correct location.
7. Restore the water supply and purge air from the system through hot taps.
8. Restore the power supply.
Mechanical Thermostat (Procedure 4)
Wear Personal Protective Equipment 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 a multi-meter between Active and Neutral, then Active and Earth,
then Neutral and Earth terminals of the terminal block that voltage is not present.
3. Disconnect the wiring to the thermostat.
4. Slide the thermostat out from under the retaining clamp.
5. Remove any scale from the cylinder surface.
6. Fit the replacement thermostat under the clamp.
7. Reconnect the wiring as per the circuit wiring diagram on page 11.
8. Conduct an electrical insulation test. Refer to page 46.
9. Refit the access cover and restore the power supply.
TM025 Rheem Heat Pump Service Instructions REV: B
Date of Issue: 02/08/07
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