SAVE A SERVICE CALL
24
TEMPERATURE PRESSURE RELIEF VALVE OR EXPANSION CONTROL VALVE
RUNNING
•
Normal Operation
It is normal and desirable the temperature
pressure relief valve or expansion control
valve (if fitted) allows a quantity of water to
escape during the heating cycle. This
quantity should be equal to approximately
1/50 of the hot water used, as water expands
by this volume when heated. However, if it
discharges more than a bucket full of water
in 24 hours, there may be another problem.
The expansion control valve will discharge
water instead of the temperature pressure
relief valve as it has a lower pressure rating.
A benefit is that energy is conserved as the
discharged water is cooler. This valve is
installed in the cold water line to the water
heater (refer to the cold water connection
•
Continuous dribble
Try gently raising the easing lever on the relief valve for a few seconds (refer
to “Relief Valves” on page 9). This may dislodge a small particle of foreign
matter and clear the fault. Release the lever gently.
•
Steady flows for long period (often at night)
This may indicate the mains water pressure sometimes rises above the
designed pressure of the water heater. Ask your installing plumber to fit a
pressure limiting valve.
Warning:
Never replace the relief valve with one of a higher pressure
rating.
•
Heavy flows of hot water from the temperature pressure relief valve until
the water heater is cold – then stops until water reheats
The gas control
must
be turned off using the knob on top of the gas control
thermostat (refer to “Close Down Procedure” on page 47). Phone Rheem
Service or nearest Accredited Service Agent to arrange for inspection.