TM005 Rheem Solar Hiline Service Instructions REV D
D.O.I 20/02/2009
This document is stored and maintained electronically by
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”.
29
Temperature and Pressure Relief Valve (Procedure 8)
This valve cannot be repaired in the field and must be replaced if it is passing excessive
amounts of water.
Normally a small quantity of water will be discharged during the heating cycle. The
discharge should cease shortly after heating stops.
If the mains pressure in the area is high i.e. over 1000kPa then the T&PR valve will
discharge excessively. High water pressure may only occur at night.
If the water pressure is high then an 800kPa pressure-limiting valve (PLV) must be
installed on the inlet supply. If the T&PR valve requires replacement ensure the new valve
is of the correct pressure rating. If the discharge temperature is above 90ºC the cause
must be identified.
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 supply to the electric booster circuit.
2. Isolate the water supply to the water heater.
3. Remove the pull cord and relieve pressure from the water heater through the T&PR
valve.
4. Drain water from the water heater through a hot tap.
5. Remove the drain line from the T&PR valve.
6. Unscrew the T&PR valve and remove.
7. Refit the replacement T&PR valve using Teflon tape. Note warnings above.
8. Refit the drain line.
9. Close the hot tap and restore water supply.
10. Check T&PR valve thread for leaks.
11. Operate the T&PR valve lever to reset relief drain.
12. Reconnect the pull cord.
13. Purge air from the system through hot taps.
14. Restore the power supply.
